Understanding Your John Deere 955
Model Overview and Specifications
The John Deere 955 compact utility tractor is a versatile machine designed for a wide range of tasks, from mowing and tilling to loader work and light construction. Understanding its core specifications is crucial for optimal performance and longevity. The 955 typically features a Yanmar-built, three-cylinder diesel engine, known for its reliability and fuel efficiency. Horsepower ratings vary slightly depending on the year of manufacture, but generally fall in the 24-28 horsepower range. Familiarizing yourself with the engine type, horsepower, and other critical parameters like hydraulic flow rate and PTO horsepower will enable you to select the right attachments and operate the tractor effectively.
Beyond the engine, the transmission is another key component to understand. The John Deere 955 usually comes equipped with a mechanical or hydrostatic transmission, offering different operational characteristics. Mechanical transmissions provide greater control and potentially better fuel economy for heavy-duty tasks, while hydrostatic transmissions offer ease of use and infinite speed adjustments, making them ideal for tasks like mowing and loader work. Know which transmission your model has and how to properly operate it. Regularly checking the transmission fluid levels and adhering to the recommended service intervals is paramount for preventing costly repairs and maintaining smooth operation.
Furthermore, understanding the tractor's dimensions, weight, and tire sizes is important for safe operation and selecting appropriate implements. The 955's compact size makes it maneuverable in tight spaces, but its weight must be considered when operating on slopes or soft ground. Knowing the correct tire pressure for various applications is also crucial for maximizing traction, minimizing tire wear, and ensuring stability. Review the operator's manual for detailed specifications specific to your model year and configuration, as slight variations may exist.
Safety Precautions and Warnings
Safety should always be the top priority when operating any tractor, including the John Deere 955. Before starting the engine, thoroughly inspect the machine for any potential hazards, such as loose parts, fluid leaks, or damaged wiring. Ensure all guards and shields are in place and properly secured. Familiarize yourself with the location of the emergency shut-off switch and know how to use it in case of an emergency. Regular safety checks are crucial for preventing accidents and ensuring a safe working environment.
Operating the 955 on uneven terrain or slopes can be particularly hazardous. Always reduce speed and be extra cautious when working on slopes. Avoid sudden turns or braking, which can increase the risk of overturning. When operating with a loader or other heavy attachments, maintain a low center of gravity by keeping the load close to the ground. Never operate the tractor under the influence of alcohol or drugs, or when fatigued. Adherence to these guidelines can significantly reduce the risk of accidents.
Never allow passengers to ride on the tractor unless it is specifically designed for that purpose. Keep children and bystanders a safe distance away from the operating tractor. Be aware of your surroundings, including overhead obstacles such as power lines. Before performing any maintenance or repairs, always disconnect the battery and ensure the tractor is properly supported to prevent accidental movement. Following all safety precautions and warnings outlined in the operator's manual is essential for protecting yourself and others from potential harm.
Operating Procedures
Pre-Operation Checks
Before commencing any operation with your John Deere 955 tractor, a thorough pre-operation check is absolutely essential. This proactive measure not only safeguards the longevity of your machine but also significantly enhances your safety and the safety of those around you. Begin by visually inspecting the entire tractor for any signs of leaks, damage, or loose components. Pay close attention to the hydraulic lines, fuel lines, and engine area, ensuring there are no visible drips or puddles. Finally, verify all safety guards and shields are securely in place and functioning as intended; these are critical for preventing accidental contact with moving parts.
Next, meticulously check all fluid levels. This includes the engine oil, coolant, hydraulic fluid, and transmission fluid. Consult the fluid level indicators or dipsticks and compare them to the recommended levels outlined in the owner's manual. Insufficient fluid levels can lead to overheating, component damage, and reduced performance. Remember to use the correct type of fluid as specified by John Deere for optimal performance and to avoid compatibility issues that could cause significant damage. Addressing any fluid deficiencies before starting the engine can save you from costly repairs down the road.
Finally, inspect the tires for proper inflation and any signs of wear or damage. Tire pressure directly affects the tractor's stability, traction, and fuel efficiency. Use a tire pressure gauge to verify that each tire is inflated to the manufacturer's recommended pressure for the specific type of operation you'll be performing. Inspect the tire sidewalls for cuts, bulges, or excessive wear. Damaged tires can be a significant safety hazard and should be replaced promptly. Pay attention to the tire treads as well, which need to provide a good amount of traction during operation.
Starting and Stopping the Engine
Starting the John Deere 955 engine requires following a specific sequence to ensure smooth and reliable ignition. First, make sure the parking brake is fully engaged to prevent any unintended movement of the tractor. Next, place the transmission in neutral and disengage the PTO (Power Take-Off) to eliminate any load on the engine during startup. Turn the ignition key to the "ON" position and wait for the glow plugs to preheat the engine cylinders, especially in cold weather; the glow plug indicator light will typically illuminate and then extinguish when the preheating is complete. Then, turn the key to the "START" position and hold it until the engine starts, being careful not to grind the starter.
If the engine fails to start after several attempts, release the key and allow the starter motor to cool down for a few minutes to prevent overheating. Check the fuel level and ensure that the fuel shut-off valve is open. Examine the battery connections to make sure they are clean and tight. A weak battery or poor connections can prevent the engine from starting. If the problem persists, consult a qualified mechanic to diagnose and repair any underlying issues. Once the engine starts, let it idle for a few minutes to allow the oil to circulate and warm up the engine components gradually.
To stop the engine, reduce the engine speed to idle. Then, turn the ignition key to the "OFF" position. Allow the engine to coast to a complete stop rather than abruptly shutting it off. This practice helps to prevent thermal stress and extends the life of the engine components. After the engine has stopped, remove the key to prevent accidental starting and to secure the tractor against unauthorized use. Remember to engage the parking brake before leaving the operator's seat.
Operating Controls and Instruments
Familiarizing yourself with the operating controls and instruments is critical for safe and efficient operation of the John Deere 955. The steering wheel controls the direction of the tractor, providing precise maneuverability. The throttle controls the engine speed, regulating the power output. Be mindful of the throttle position to maintain optimal speed for the task at hand. The gear shift lever allows you to select the appropriate gear for the terrain and the workload. Use lower gears for heavy pulling or climbing steep inclines, and higher gears for faster travel on level surfaces.
The instrument panel provides vital information about the tractor's operating condition. The tachometer displays the engine speed in revolutions per minute (RPM), helping you to maintain the proper speed range for optimal performance and fuel efficiency. The temperature gauge indicates the engine coolant temperature, alerting you to potential overheating issues. The fuel gauge shows the amount of fuel remaining in the tank, ensuring that you don't run out of fuel during operation. If your tractor is equipped, the hydraulic pressure gauge monitors the pressure in the hydraulic system, indicating whether the system is functioning properly.
The brake pedals control the tractor's braking system. The John Deere 955 may have separate brake pedals for each rear wheel, allowing for differential braking to improve maneuverability in tight spaces. The PTO lever engages or disengages the power take-off shaft, which is used to power implements such as mowers and tillers. The hydraulic levers control the hydraulic system, allowing you to raise and lower implements and operate hydraulic cylinders. Practice using these controls in a safe and open area to develop proficiency and confidence before operating in challenging conditions.
Safe Operating Practices
Safety should always be your top priority when operating any tractor, including the John Deere 955. Always wear appropriate personal protective equipment (PPE), including safety glasses, hearing protection, and sturdy work boots. Avoid loose clothing that could get caught in moving parts. Prior to starting the tractor, clear the surrounding area of any obstacles or bystanders. Be especially cautious of children and pets, who may not be aware of the dangers of operating machinery.
When operating on slopes or uneven terrain, reduce your speed and use caution to prevent rollovers. Avoid making sudden turns or abrupt stops, which can destabilize the tractor. Be aware of overhead obstacles such as power lines or tree branches. Never operate the tractor under the influence of alcohol or drugs. Ensure that all passengers are seated securely and that the tractor is not overloaded. Overloading can compromise the tractor's stability and braking performance.
Regularly inspect and maintain the tractor to ensure that it is in safe operating condition. Pay attention to warning signs or unusual noises, and address any issues promptly. Familiarize yourself with the tractor's safety features, such as the rollover protection structure (ROPS) and seat belt. Always use the seat belt when operating the tractor, as it can significantly reduce the risk of injury in the event of a rollover. Following these safe operating practices will help to ensure a safe and productive experience with your John Deere 955.
Regular Maintenance
Engine Maintenance (Oil, Filters, Coolant)
Maintaining the engine of your John Deere 955 is paramount for its longevity and optimal performance. Regular oil changes are crucial. You should be using a high-quality engine oil that meets or exceeds John Deere's specifications. Always check the oil level regularly using the dipstick, ensuring it falls within the acceptable range marked on the dipstick. Neglecting this simple task can lead to catastrophic engine failure due to lack of lubrication. Furthermore, replacing the oil filter at each oil change ensures that contaminants are removed from the oil supply, protecting vital engine components.
The engine's air filter also plays a vital role in protecting the engine from damage. A dirty or clogged air filter restricts airflow, leading to reduced engine power and increased fuel consumption. Check the air filter regularly and replace it as needed. Depending on the operating conditions, you may need to replace it more frequently than the recommended interval. Finally, don't forget the engine coolant. The cooling system's purpose is to regulate engine temperature and prevent overheating. Check the coolant level regularly and ensure it's at the proper concentration to provide adequate freeze and boil-over protection.
Transmission and Hydraulic System Maintenance
The transmission and hydraulic systems are the heart of the John Deere 955's functionality. Proper maintenance of these systems ensures smooth operation and prevents costly repairs. Inspect the hydraulic fluid level regularly and add fluid as needed. Ensure you are using the correct type of hydraulic fluid specified in the operator's manual. Using the wrong fluid can damage the seals and other components in the system.
Filter changes are just as important for the transmission and hydraulic systems as they are for the engine. Regular filter replacements remove contaminants that can damage the pump, valves, and other hydraulic components. You should also visually inspect hydraulic hoses and fittings for leaks or damage. Replacing worn or damaged hoses promptly will prevent fluid loss and potential system failures. Finally, check the transmission fluid level regularly and change the fluid and filter according to the manufacturer's recommendations.
Brake System Maintenance
The brake system is a critical safety component on any tractor, and the John Deere 955 is no exception. Regularly inspect the brake pedal travel and adjust as needed to ensure proper brake engagement. Make sure both brakes engage evenly to prevent pulling to one side during braking. Check the brake lines for leaks or damage.
If your tractor is equipped with hydraulic brakes, inspect the brake fluid level and add fluid as needed. Bleed the brakes periodically to remove any air that may have entered the system. This will ensure proper brake function. Finally, inspect the brake linings or pads for wear and replace them as needed. Worn brake linings can significantly reduce braking performance and create a safety hazard.
Electrical System Maintenance
The electrical system is vital for starting and operating your John Deere 955. Regularly inspect the battery terminals for corrosion and clean them as needed. A buildup of corrosion can impede the flow of electricity, making it difficult to start the engine. Check the battery's electrolyte level (if applicable) and add distilled water as needed. Replace the battery when it no longer holds a charge.
Inspect the wiring harness for any signs of damage, such as frayed wires or loose connections. Repair any damaged wires promptly to prevent electrical shorts or fires. Check the fuses and replace any blown fuses with the correct amperage rating. Using the wrong amperage fuse can damage the electrical system. Finally, ensure all lights are working properly. Replace any burned-out bulbs promptly.
Lubrication Schedule
Following a regular lubrication schedule is essential for maintaining the smooth operation of your John Deere 955. Lubricate all grease fittings according to the recommendations in the operator's manual. Use a high-quality grease specifically designed for agricultural equipment. Be sure to clean the grease fittings before applying grease to prevent dirt and debris from entering the bearings.
Pay particular attention to the pivot points on the steering linkage, loader (if equipped), and other moving parts. Regular lubrication of these areas will prevent wear and tear and ensure smooth operation. Don't forget to lubricate the PTO shaft and universal joints as needed. Finally, after lubricating, wipe away any excess grease to prevent dirt and debris from accumulating.
Tire Maintenance and Inflation
Proper tire maintenance is crucial for maximizing the life and performance of your John Deere 955. Regularly check the tire pressure and inflate the tires to the recommended pressure. Underinflated tires can lead to increased fuel consumption and tire wear, while overinflated tires can reduce traction and ride comfort. Be sure to check the tire pressure when the tires are cold.
Inspect the tires for any signs of damage, such as cuts, bulges, or excessive wear. Replace any damaged tires promptly to prevent blowouts. Also, check the wheel bolts or nuts for tightness and tighten them as needed. Maintaining proper tire pressure and condition will improve traction, reduce fuel consumption, and extend the life of your tires. Clean tires of excessive mud and debris so they can operate correctly and last longer.
Troubleshooting
Engine Problems (Starting, Misfiring, Overheating)
Engine problems are a common headache for tractor owners, but understanding the potential causes is the first step towards a solution. If your John Deere 955 is struggling to start, begin by checking the fuel supply. Ensure the fuel tank is adequately filled and the fuel shut-off valve is open. Next, inspect the battery and starter motor connections for corrosion or looseness. A weak battery can prevent the starter from engaging properly, so a load test is recommended. Finally, if the engine turns over but doesn't fire, consider a problem with the glow plugs or fuel injection system, particularly in cold weather.
A misfiring engine indicates that one or more cylinders are not firing correctly. This can lead to reduced power, rough idling, and increased fuel consumption. Start by checking the spark plugs for fouling, damage, or incorrect gap. A faulty spark plug wire can also cause misfires, so inspect them for cracks or damage. In addition, check the fuel injectors or carburetor for any obstructions. Sometimes, the fuel filter is clogged. A compression test can help determine if there are internal engine issues such as worn piston rings or valves.
Overheating is a serious engine issue that can cause significant damage. The first thing you should do is check the coolant level in the radiator and expansion tank. Look for leaks in the radiator hoses, water pump, or engine block. Ensure the radiator cap is sealing properly to maintain proper pressure in the cooling system. A malfunctioning thermostat can prevent coolant from circulating properly, leading to overheating. Finally, check the cooling fan and its drive belt to ensure it's functioning correctly; a broken or slipping belt will prevent adequate airflow through the radiator.
Transmission and Hydraulic System Issues
Problems in the transmission and hydraulic system can impact your tractor's ability to perform tasks. If you experience difficulty shifting gears, first check the transmission fluid level and condition. Low or contaminated fluid can cause shifting problems. Inspect the shift linkage for any looseness, wear, or damage. Sometimes, the internal components of the transmission may be worn or damaged, requiring professional repair. Make sure to reference your owner's manual when diagnosing any problems within the transmission.
Hydraulic system issues can manifest as slow or weak operation of implements, or a complete failure to operate. Start by checking the hydraulic fluid level and condition. Air in the hydraulic system can cause problems, so bleed the system according to the manufacturer's instructions. Inspect the hydraulic hoses and fittings for leaks or damage. A faulty hydraulic pump can also cause problems, so check its output pressure and flow rate. Clean or replace filters.
Electrical System Faults
Electrical problems can range from simple blown fuses to more complex wiring issues. If you experience electrical problems, start by checking the fuses. Replace any blown fuses with the correct amperage rating. Inspect the wiring harness for any signs of damage, such as frayed wires, loose connections, or corrosion. A multimeter can be used to test for voltage and continuity in the electrical circuits. A faulty ignition switch can prevent the engine from starting.
Brake System Problems
Brake problems can compromise the safety of your tractor. If you experience weak or ineffective braking, start by checking the brake fluid level. Inspect the brake lines and calipers for leaks. Worn brake pads or shoes can also cause problems, so replace them as needed. Check the brake pedal linkage for any looseness or binding. Sometimes, the brake master cylinder or wheel cylinders may be faulty, requiring replacement.
Steering System Problems
Steering system problems can make it difficult to control the tractor. If you experience hard steering or excessive play in the steering wheel, start by checking the power steering fluid level. Inspect the steering linkage for any looseness or wear. A faulty power steering pump can also cause problems, so check its output pressure. Make sure to review your owner's manual when examining the steering components.
Repair Procedures
Engine Repair and Overhaul
The heart of any John Deere 955 tractor is undoubtedly its engine. Proper maintenance and timely repair are crucial for ensuring optimal performance and longevity. Before undertaking any engine repair, it's paramount to thoroughly diagnose the issue. This often involves a compression test, leak-down test, and a visual inspection of all components, including hoses, belts, and wiring. Always consult the John Deere 955 service manual for specific troubleshooting procedures and torque specifications. Ignoring these specifications can lead to improper assembly and potential engine damage. Remember to disconnect the battery before commencing any work to prevent electrical shorts and ensure safety.
When an engine overhaul is required, meticulous attention to detail is essential. Begin by carefully disassembling the engine, labeling and organizing all parts to facilitate reassembly. Clean all components thoroughly, removing any carbon buildup or debris that may impede performance. Inspect cylinder walls for scoring or excessive wear, and check the condition of pistons, rings, and connecting rods. Replacement of worn or damaged parts is often necessary to restore the engine to its original operating condition. Ensure you use genuine John Deere parts whenever possible, as they are designed and manufactured to meet the exact specifications of the 955 engine.
Cylinder head repair is a common aspect of engine overhaul. Inspect the valve seats for wear or damage and consider reconditioning or replacing them if necessary. Check valve guides for excessive play and replace them if required. The cylinder head should be thoroughly cleaned and checked for cracks or warping. When reinstalling the cylinder head, use a new head gasket and tighten the head bolts to the specified torque sequence and values outlined in the service manual. Improperly tightened head bolts can lead to head gasket failure and significant engine damage. Following these steps carefully will ensure a successful and long-lasting engine repair.
Transmission and Hydraulic System Repair
The transmission and hydraulic systems are vital for the John Deere 955's operational capabilities. A properly functioning transmission ensures smooth gear changes and efficient power transfer to the wheels, while a reliable hydraulic system powers essential functions like the loader and mower. Identifying issues within these systems often requires careful observation of performance symptoms, such as jerky gear shifts, slow hydraulic response, or leaks. Before initiating any repair, drain the hydraulic fluid and transmission oil to prevent contamination and ensure a cleaner working environment. Refer to the service manual for the correct fluid specifications and procedures for draining and refilling.
Transmission repairs often involve inspecting the gears, bearings, and synchronizers for wear or damage. Disassembly requires specialized tools and a clean workspace to prevent contamination. When reassembling, pay close attention to the correct placement of shims and spacers, as these are critical for proper gear meshing and smooth operation. Hydraulic system repairs may involve replacing hoses, seals, or pumps. Inspect all hydraulic lines for leaks or damage and replace them as needed. When replacing hydraulic pumps, ensure they are properly aligned and that all connections are tight to prevent leaks. Bleed the hydraulic system after repairs to remove any trapped air and ensure optimal performance.
Proper hydraulic fluid maintenance is paramount for the longevity of the hydraulic system. Regularly check the fluid level and condition, and change the fluid and filter at the intervals specified in the service manual. Using the correct type of hydraulic fluid is crucial, as incorrect fluids can damage seals and other components. Always follow the manufacturer's recommendations for fluid type and filter replacement. Furthermore, inspect the hydraulic cylinders for leaks or damage and repair or replace them as needed. Addressing minor issues promptly can prevent them from escalating into more costly and complex repairs. Thorough inspections and preventative maintenance are key to ensuring the reliable operation of your John Deere 955's transmission and hydraulic systems.
Brake System Repair
The brake system on your John Deere 955 is critical for safety and control. Ensuring the brakes are functioning optimally is paramount, especially when operating on uneven terrain or towing heavy loads. Common brake system issues include worn brake pads, leaking brake lines, and malfunctioning master cylinders. Before beginning any repair, thoroughly inspect the brake lines, master cylinder, and brake calipers for leaks or damage. Check the brake pads for wear and replace them if they are worn below the minimum thickness specified in the service manual. Always use genuine John Deere brake pads, as they are designed to provide optimal stopping power and longevity.
Brake repairs often involve replacing the brake pads, rotors, or calipers. When replacing brake pads, clean the caliper surfaces thoroughly and lubricate the slide pins to ensure smooth operation. Inspect the brake rotors for wear or damage and replace them if they are scored or warped. When replacing brake calipers, ensure they are properly aligned and that all connections are tight. Bleeding the brake system is essential after any brake repair to remove trapped air and ensure a firm brake pedal. Follow the bleeding procedure outlined in the service manual, starting with the wheel farthest from the master cylinder.
Master cylinder repair or replacement may be necessary if the brake pedal feels spongy or if there are leaks in the system. When replacing the master cylinder, ensure it is properly mounted and that all connections are tight. Bleed the master cylinder before connecting the brake lines to ensure all air is removed. Regular brake system maintenance includes checking the brake fluid level and condition, and replacing the fluid at the intervals specified in the service manual. Using the correct type of brake fluid is crucial, as incorrect fluids can damage seals and other components. By performing regular inspections and addressing minor issues promptly, you can ensure the reliable and safe operation of your John Deere 955's brake system.
Electrical System Repair
The electrical system of your John Deere 955 powers numerous functions, from starting the engine to operating the lights and gauges. A properly functioning electrical system is essential for reliable operation and safety. Common electrical system issues include a dead battery, faulty wiring, and malfunctioning components such as the starter, alternator, and lights. Before beginning any electrical repair, disconnect the battery to prevent electrical shorts and ensure safety. Use a multimeter to test the battery voltage, wiring continuity, and component functionality. Consult the service manual for specific troubleshooting procedures and wiring diagrams.
Battery maintenance is crucial for the electrical system's performance. Regularly check the battery terminals for corrosion and clean them as needed. Ensure the battery is properly charged and that the charging system is functioning correctly. Test the alternator output voltage to ensure it is charging the battery properly. Wiring repairs often involve replacing damaged wires, connectors, or fuses. Use the correct gauge wire and ensure all connections are secure. Replace any blown fuses with the correct amperage rating. Do not use a higher amperage fuse, as this can damage the electrical system.
Starter and alternator repairs may involve replacing the entire unit or repairing individual components. Inspect the starter solenoid and armature for wear or damage. Test the alternator diodes and regulator for proper functionality. When replacing electrical components, ensure they are properly grounded and that all connections are tight. Check the lights and gauges for proper operation and replace any bulbs or sensors as needed. Regularly inspect the wiring harness for damage and repair any frayed or cracked wires. By performing regular inspections and addressing electrical issues promptly, you can ensure the reliable and safe operation of your John Deere 955's electrical system.
Steering System Repair
The steering system of your John Deere 955 provides you with the control you need for safe and efficient operation. Issues with the steering system can make it difficult to maneuver the tractor, increasing the risk of accidents. Common steering system problems include excessive play in the steering wheel, stiff steering, and leaks in the power steering system. Before beginning any repair, thoroughly inspect the steering linkage, tie rod ends, and power steering pump for wear or damage. Check the power steering fluid level and condition. Consult the service manual for specific troubleshooting procedures.
Steering linkage repairs often involve replacing worn tie rod ends or adjusting the steering linkage to reduce play. Use a torque wrench to tighten the tie rod end nuts to the specified torque. Inspect the steering gear box for leaks or damage and repair or replace it as needed. Power steering system repairs may involve replacing the power steering pump, hoses, or cylinders. Ensure all connections are tight to prevent leaks. Bleed the power steering system after repairs to remove any trapped air and ensure smooth steering.
Power steering fluid maintenance is crucial for the longevity of the power steering system. Regularly check the fluid level and condition, and replace the fluid and filter at the intervals specified in the service manual. Using the correct type of power steering fluid is essential, as incorrect fluids can damage seals and other components. Inspect the steering cylinders for leaks or damage and repair or replace them as needed. Furthermore, inspect the front wheel bearings for wear or damage, and lubricate or replace them as needed to maintain smooth steering. By performing regular inspections and addressing minor issues promptly, you can ensure the reliable and safe operation of your John Deere 955's steering system.
Parts and Diagrams
Engine Parts Diagram
Understanding the engine components of your John Deere 955 is crucial for effective maintenance and troubleshooting. The following diagram illustrates the key parts of the engine, including the cylinder head, pistons, connecting rods, crankshaft, and valve train. Pay close attention to the placement and relationship of these components, as this knowledge will be invaluable when diagnosing engine problems. Refer to this diagram when inspecting the engine for wear, damage, or leaks. Remember to always consult the torque specifications in the service manual when reassembling any engine components to ensure proper function and prevent future issues.
The diagram will show the location of crucial parts like the fuel pump, oil filter, and air intake system. Familiarizing yourself with these components will allow you to perform routine maintenance tasks, such as changing the oil filter or cleaning the air filter, more efficiently. Regular maintenance of these parts will greatly extend the life of the engine. It's also important to note the different types of hoses and connections used within the engine compartment. Identify each hose by its size and function, and inspect them regularly for cracks, leaks, or deterioration, all of which can cause serious damage if left unchecked.
Transmission Parts Diagram
The transmission is a critical system responsible for transferring power from the engine to the wheels. This diagram provides a detailed overview of the transmission components, including gears, shafts, bearings, and the shift linkage. A thorough understanding of these components is essential for diagnosing and repairing transmission-related issues. Carefully examine the diagram to identify the location of each component and its function within the transmission system. By studying the diagram, you'll be better equipped to diagnose issues like slipping gears, difficulty shifting, or unusual noises coming from the transmission.
Note the arrangement of the gears and how they interact to provide different speed ratios. Understanding the gear ratios can help you troubleshoot performance problems or identify incorrect settings. Inspect the bearings and seals for wear or damage, as these components are vital for smooth and efficient operation. Always use the correct type of oil and follow the recommended service intervals to ensure optimal transmission performance and longevity. Also ensure when working on the transmission that you have a clean workspace in order to not get any dirt or debris inside the transmission.
Hydraulic System Diagram
The hydraulic system powers many essential functions on your John Deere 955, including the loader, steering, and implement lifts. This diagram illustrates the key components of the hydraulic system, such as the hydraulic pump, control valves, cylinders, and hoses. Understanding how these components work together is crucial for troubleshooting hydraulic problems. The diagram will also show the flow of hydraulic fluid through the system, allowing you to identify potential bottlenecks or leaks. By tracing the hydraulic lines on the diagram, you can pinpoint the source of malfunctions such as slow operation, loss of power, or fluid leaks.
Carefully examine the location of the pressure relief valve and understand its function in protecting the system from overpressure. Inspect all hydraulic hoses and fittings for signs of wear, cracks, or leaks. Replace any damaged components immediately to prevent further damage to the system. Make sure the hydraulic fluid is at the correct level and is free from contaminants. Use the correct type of hydraulic fluid as recommended by John Deere for optimal performance and to prevent damage to the hydraulic system's seals. Remember that hydraulic systems operate under high pressure, so take all necessary safety precautions when working on them.
Electrical Wiring Diagram
The electrical system is vital for starting, operating, and controlling various functions on your John Deere 955. This diagram provides a detailed overview of the wiring harness, fuses, relays, switches, and other electrical components. Understanding the electrical wiring is crucial for troubleshooting electrical issues, such as starting problems, lighting malfunctions, or instrument panel failures. The diagram shows the color coding of the wires and the location of various electrical components throughout the machine. This information is invaluable when tracing circuits or identifying faulty connections. Always disconnect the battery before working on any electrical components to prevent shorts or electrical shocks.
Pay close attention to the grounding points and ensure they are clean and secure. Inspect the wiring harness for any signs of damage, such as frayed wires, cracked insulation, or loose connectors. Use a multimeter to test the continuity of circuits and identify any open or short circuits. Replace any faulty components with genuine John Deere parts to ensure proper function and reliability. Always use the correct size and type of fuse to protect the electrical system from overloads. Always take your time and use the wiring diagram whenever possible to ensure you are connecting the correct wire and not damaging any electrical components.
Parts List and Ordering Information
This section provides a comprehensive list of all the parts used on your John Deere 955, along with their corresponding part numbers. This information is essential for ordering replacement parts and ensuring that you receive the correct components for your machine. The parts list is organized by system, such as engine, transmission, hydraulic system, and electrical system. You can use the diagrams provided in the previous sections to identify the specific part you need and then locate its part number in the parts list. When ordering parts, be sure to provide the part number, description, and quantity to ensure accuracy.
Always order genuine John Deere parts to ensure optimal performance, reliability, and compatibility with your machine. Using aftermarket parts may void your warranty and could lead to further damage. When ordering online, verify the authenticity of the seller and ensure they are an authorized John Deere dealer. Keep a record of all the parts you order, including the date, part number, and supplier. This will help you track your repairs and make it easier to order replacement parts in the future. Consider keeping a small inventory of commonly used parts, such as filters, belts, and hoses, to minimize downtime during routine maintenance or repairs.
Attachments and Implements
Compatible Attachments
The John Deere 955 tractor is a versatile machine capable of handling a wide array of attachments and implements, greatly expanding its functionality and usefulness. Selecting the right attachment for the job is crucial for optimal performance and longevity of both the tractor and the implement itself. Before connecting any attachment, thoroughly review the attachment's operator's manual for specific instructions and safety precautions. Understanding the weight and power requirements of the attachment is paramount to prevent overloading the tractor's hydraulic system or exceeding its lifting capacity, which could result in damage or dangerous operating conditions. Always verify compatibility with the tractor's hitch system and PTO (Power Take-Off) speed.
A common attachment for the John Deere 955 is the rotary cutter, often referred to as a brush hog or bush hog. These cutters are ideal for clearing overgrown fields, maintaining pastures, and managing roadside vegetation. When using a rotary cutter, ensure the tractor is equipped with appropriate safety shields and guards to protect the operator from flying debris. Proper adjustment of the cutter height is essential to prevent scalping the ground or damaging the cutter blades. Regularly inspect the blades for sharpness and damage, replacing them as needed to maintain efficient cutting performance and reduce stress on the tractor's engine. Remember to disengage the PTO and allow the cutter to come to a complete stop before dismounting the tractor.
Another useful implement is the box blade, typically used for grading, leveling, and spreading materials such as gravel and topsoil. The box blade's adjustable scarifier teeth allow for loosening compacted soil, making it an excellent tool for preparing seedbeds or improving drainage. When operating a box blade, start with shallow cuts and gradually increase the depth as needed to avoid overloading the tractor. Maintain a consistent ground speed to ensure a smooth and even finish. Periodically inspect the scarifier teeth for wear and replace them when necessary to maintain optimal performance. Be mindful of the weight distribution of the box blade, especially when transporting it, to maintain stability and prevent tipping.
Operating and Maintaining Attachments
Proper operation of attachments is critical for both efficiency and safety. Always consult the specific attachment's operator's manual for detailed instructions on operation, maintenance, and safety procedures. Before operating any attachment, perform a thorough pre-operation inspection, checking for any signs of damage, wear, or loose connections. Ensure that all safety guards and shields are in place and functioning correctly. Never operate an attachment without proper training and understanding of its controls and limitations. Familiarize yourself with the attachment's emergency shutdown procedures in case of malfunction or hazardous conditions.
Regular maintenance is essential for extending the lifespan and ensuring optimal performance of your attachments. After each use, clean the attachment thoroughly, removing any accumulated debris, dirt, or vegetation. Lubricate all moving parts according to the manufacturer's recommendations, using the appropriate type of grease or oil. Inspect the attachment for any signs of wear, damage, or corrosion, and repair or replace any worn or damaged parts promptly. Store the attachment in a dry, sheltered location to protect it from the elements and prevent rust or corrosion. Properly storing your implements greatly reduces the potential for damage from exposure to humidity and moisture.
The PTO shaft is a critical component for powering many attachments, and its maintenance is of utmost importance. Regularly inspect the PTO shaft for any signs of wear, damage, or bending. Ensure that the safety shields are in place and functioning correctly to prevent entanglement hazards. Lubricate the PTO shaft's slip joints regularly to ensure smooth operation and prevent premature wear. If the PTO shaft is damaged or worn, replace it immediately to prevent serious accidents or damage to the tractor's PTO system. Never operate an attachment with a damaged or improperly shielded PTO shaft. Always ensure the PTO shaft length is correct for the specific attachment being used to avoid binding or overextension, which can lead to component failure.
Storage and Transportation
Preparing for Storage
Preparing your John Deere 955 tractor for storage is crucial for maintaining its performance and extending its lifespan. Neglecting this step can lead to a host of problems, including battery discharge, rust formation, fuel system issues, and tire degradation. Before storing your tractor, thoroughly clean it to remove dirt, mud, and debris. This will prevent corrosion and make it easier to identify any potential problems later on. Furthermore, consider the environment in which you'll be storing the tractor. Ideally, a dry, sheltered location is best, away from direct sunlight and extreme temperature fluctuations.
Once the tractor is clean, it's essential to address the fuel system. Fuel, especially gasoline, can degrade over time and leave behind deposits that clog fuel lines and carburetors. To prevent this, either drain the fuel tank completely or add a fuel stabilizer according to the manufacturer's instructions. Fuel stabilizer will keep the fuel fresh and prevent the formation of gum and varnish. Next, disconnect the battery cables, starting with the negative terminal. Clean the terminals to remove any corrosion and store the battery in a cool, dry place, preferably on a wooden pallet or battery maintainer to prevent discharge.
Engine maintenance during storage preparation is equally important. Change the engine oil and filter to remove contaminants that can corrode internal engine parts. Run the engine briefly after the oil change to circulate the fresh oil. Consider adding a fogging oil to the cylinders to protect them from rust and corrosion. This involves removing the spark plugs and spraying fogging oil directly into each cylinder before reinstalling the plugs. Finally, inflate the tires to the recommended pressure and place the tractor on blocks to prevent flat spots from forming. This reduces the strain on the tires and helps maintain their shape during extended storage.
Safe Transportation Procedures
Transporting your John Deere 955 tractor safely requires careful planning and adherence to specific procedures. First and foremost, ensure that you have the appropriate trailer or transport vehicle. The trailer should be rated to handle the weight of the tractor and equipped with secure tie-down points. Before loading the tractor, inspect the trailer's tires, lights, and brakes to ensure they are in good working order. Consider the legal requirements for transporting agricultural equipment on public roads, including permits, lighting, and signage.
When loading the tractor onto the trailer, use ramps that are adequately rated for the weight of the machine. Drive slowly and carefully onto the ramps, ensuring that the tractor is centered on the trailer. Once the tractor is securely positioned, engage the parking brake and chock the wheels to prevent movement. Secure the tractor to the trailer using heavy-duty straps or chains that are rated to withstand the forces of transportation. Attach the straps or chains to designated tie-down points on the tractor and trailer, ensuring that they are tightened properly and evenly distributed.
Before transporting the tractor, double-check all tie-down points and ensure that nothing is loose or at risk of coming undone during transit. Plan your route carefully, considering road conditions, traffic, and any potential obstacles. Drive cautiously and avoid sudden stops or sharp turns. Regularly check the tie-down points during long trips to ensure that they remain secure. Adhering to these procedures will minimize the risk of accidents and ensure the safe transportation of your John Deere 955 tractor.
Technical Specifications
Detailed Specifications
The John Deere 955 is a compact utility tractor renowned for its versatility and robust performance in various agricultural and landscaping applications. Understanding its detailed specifications is crucial for effective operation, maintenance, and repair. This section provides an in-depth look at the key components and their corresponding parameters, ensuring users have the necessary information to maximize the tractor's potential and longevity. From engine specifics to hydraulic system capabilities, we cover the essential data required for informed decision-making.
The heart of the John Deere 955 is its reliable Yanmar diesel engine, a three-cylinder powerhouse known for its fuel efficiency and durability. The engine boasts a displacement of approximately 76 cubic inches (1.2 liters), delivering a respectable horsepower rating suitable for a wide range of tasks. The exact horsepower may vary slightly depending on the specific model year and configuration, so it's essential to consult the tractor's serial number and corresponding documentation for precise details. This engine is designed to operate smoothly and efficiently under diverse conditions, making it a dependable workhorse for any operation.
The transmission system of the John Deere 955 offers a range of gear options, typically including a combination of forward and reverse speeds. This allows for precise control and adaptability to various terrain and task requirements. The specific number of gears can vary, often featuring a synchronized or partially synchronized transmission for smoother shifting. Furthermore, the tractor incorporates a differential lock mechanism, enhancing traction in challenging conditions and preventing wheel slippage, thereby improving overall productivity.
The hydraulic system on the John Deere 955 is designed for efficient operation of implements and attachments, contributing significantly to the tractor's versatility. It typically features an open-center hydraulic system with a dedicated pump capable of delivering sufficient flow and pressure to power various hydraulic functions. The hydraulic system is integral to operating implements such as loaders, backhoes, and mowers, ensuring reliable and responsive performance. The flow rate and pressure are important to check periodically as they can change as the tractor ages and impact performance.
Torque Settings
Accurate torque settings are paramount when performing maintenance or repairs on the John Deere 955. Improper torque can lead to component failure, premature wear, or even catastrophic damage. This section outlines the recommended torque values for critical fasteners throughout the tractor, ensuring that all components are securely fastened and operating within their intended parameters. Always consult the service manual and use a calibrated torque wrench to achieve the specified torque values.
For engine components, specific torque settings are crucial for the cylinder head bolts, connecting rod bolts, and main bearing cap bolts. Tightening these fasteners to the correct torque ensures proper compression and prevents oil leaks, maintaining optimal engine performance and longevity. Refer to the engine section of the service manual for detailed torque specifications and tightening sequences. Using a calibrated torque wrench is critical for verifying precise torque is applied.
Regarding the transmission and driveline, accurate torque is essential for the axle nuts, pinion nuts, and transmission housing bolts. These components are subjected to significant stress during operation, and proper tightening ensures they can withstand these loads without loosening or failing. Incorrect torque on these fasteners can lead to drivetrain vibrations, excessive wear, and potential component breakage. Review the transmission section in the service manual when these items are addressed.
When working on the hydraulic system, precise torque settings are required for the hydraulic fittings, pump mounting bolts, and valve body bolts. Leaks in the hydraulic system can result in loss of hydraulic pressure and potential contamination, affecting the performance of hydraulically powered implements. Securely tightening these fasteners prevents leaks and ensures the system operates efficiently and reliably. Regular maintenance to the hydraulic system will reduce the risk of failures.
Fluid Capacities
Maintaining proper fluid levels is vital for the optimal performance and longevity of the John Deere 955. This section provides the recommended fluid capacities for various systems within the tractor, including the engine oil, coolant, hydraulic fluid, and transmission fluid. Regularly checking and replenishing these fluids to the correct levels ensures that all components are adequately lubricated, cooled, and protected from wear and corrosion.
The engine oil capacity for the John Deere 955 is typically around 4 quarts (3.8 liters), but this can vary slightly depending on the specific engine model and oil filter used. It's crucial to use the recommended engine oil viscosity and specification, as outlined in the owner's manual, to ensure proper lubrication and protection against engine wear. Regularly checking the oil level and changing the oil at the recommended intervals is critical for maintaining engine health.
The cooling system capacity is essential for preventing overheating and maintaining the engine at its optimal operating temperature. The total coolant capacity is typically around 5 quarts (4.7 liters), including the radiator, engine block, and coolant reservoir. It's essential to use a high-quality coolant that is compatible with the John Deere 955 and to periodically check the coolant level and condition. Inspecting coolant regularly can catch small problems before they turn into big ones.
The hydraulic system and transmission fluid reservoirs often share a common fluid in compact tractors like the John Deere 955. The combined capacity is typically around 6 gallons (22.7 liters). Using the recommended hydraulic/transmission fluid ensures proper lubrication of hydraulic components and smooth operation of the transmission. Regular fluid changes and filter replacements are crucial for preventing contamination and maintaining the system's efficiency.