The John Deere 85G is a powerful and versatile compact excavator, designed for a wide range of applications including construction, landscaping, and utility work. This machine boasts a robust hydraulic system, ensuring efficient operation of the boom, arm, and bucket, even in demanding conditions. Understanding the key specifications of your 85G is crucial for optimal performance and safe operation. Key specifications include engine horsepower, operating weight, maximum digging depth, and bucket capacity. Familiarize yourself with these details, which are readily available in the operator's manual and on the machine's specification plate, to ensure you are operating the excavator within its designed parameters.
Beyond the fundamental specifications, it's important to know the capabilities of the machine in various operating modes. For example, understanding the difference in digging force when using the power boost feature can significantly impact your productivity. Also, be aware of the machine's reach and lifting capacities at different distances and heights, as exceeding these limits can lead to instability and potential accidents. Regularly reviewing the operator's manual and familiarizing yourself with the machine's performance charts will help you maximize efficiency and maintain a safe working environment. Furthermore, pay attention to the types of attachments compatible with your 85G, as selecting the right tool for the job is essential for achieving optimal results.
Operating heavy machinery like the John Deere 85G comes with inherent risks, making strict adherence to safety precautions paramount. Before starting any operation, conduct a thorough walk-around inspection, checking for any signs of damage, leaks, or loose components. Verify that all safety guards and shields are in place and functioning correctly. Ensure that all personnel in the vicinity are aware of the excavator's operation and maintain a safe distance. Remember that complacency is a major contributor to accidents, so always remain vigilant and focused while operating the machine.
Always wear appropriate personal protective equipment (PPE), including a hard hat, safety glasses, steel-toed boots, and hearing protection. Be mindful of overhead obstructions, such as power lines and trees, and maintain a safe clearance distance. When operating on uneven terrain, exercise extra caution to prevent rollovers. Never allow passengers to ride on the machine, and always engage the parking brake when the excavator is stationary. Familiarize yourself with the location and operation of emergency shutdown procedures, as well as the procedures for safely exiting the machine in case of an emergency. Regular safety meetings and refresher training can help reinforce these essential safety practices.
A solid understanding of the various components of your John Deere 85G is crucial for effective maintenance and troubleshooting. Familiarize yourself with the location and function of key components, such as the engine, hydraulic pump, control valves, final drives, and operator station controls. Knowing the purpose of each component will enable you to identify potential problems more easily and perform routine maintenance tasks more efficiently. Regularly consult the parts manual to identify specific components and their part numbers, as this will be invaluable when ordering replacement parts.
Beyond the major components, pay attention to smaller, but equally important, parts like filters, hoses, and electrical connectors. Inspect these components regularly for signs of wear, damage, or corrosion. Understanding the layout of the hydraulic system, including the location of pressure test ports and relief valves, is essential for troubleshooting hydraulic issues. Similarly, knowing the routing of electrical wiring and the location of fuses and relays can help you diagnose electrical problems quickly. By developing a comprehensive understanding of your machine's components, you will be better equipped to maintain its performance and extend its lifespan.
Before starting your John Deere 85G excavator, a thorough pre-operation check is crucial for ensuring safety and preventing potential mechanical issues. This involves a careful inspection of various components to identify any signs of damage, wear, or leaks. Start by visually inspecting the machine for any loose or missing parts, paying close attention to the hydraulic hoses, cylinder rods, and undercarriage. Ensure that all safety guards and shields are in place and securely fastened. Taking the time to conduct these checks will not only prolong the life of your excavator but also safeguard against accidents and costly repairs down the line.
Next, verify the fluid levels. Check the engine oil, hydraulic fluid, coolant, and fuel levels, replenishing as needed to the recommended levels. Low fluid levels can lead to overheating, component damage, and reduced performance. Consult your operator's manual for specific fluid types and capacities. Additionally, inspect the air filter for any signs of dirt or debris, cleaning or replacing it as necessary to ensure optimal engine performance. Proper pre-operation checks are an investment in the longevity and efficiency of your John Deere 85G.
Starting the John Deere 85G requires a specific sequence of actions to ensure a smooth and safe startup. First, ensure that the parking brake is engaged and all controls are in the neutral position. Insert the key and turn it to the "on" position, allowing the instrument panel to illuminate and the engine control unit (ECU) to initialize. Once the ECU is ready, turn the key further to the "start" position, holding it until the engine starts. Avoid prolonged cranking, as this can damage the starter motor. If the engine fails to start after a few attempts, consult the troubleshooting section of your manual.
To stop the engine, release any pressure on the hydraulic controls and allow the engine to idle for a few minutes to cool down. Then, turn the key to the "off" position. It is important to allow the engine to cool before shutting it down completely to prevent thermal stress and extend its lifespan. Finally, remove the key to prevent unauthorized operation. Following these procedures meticulously will contribute to the long-term reliability of your John Deere 85G.
Understanding the function of each control is essential for safe and efficient operation of the John Deere 85G. The control levers operate the boom, stick, and bucket, allowing for precise digging and material handling. Familiarize yourself with the direction and sensitivity of each control. The travel levers or pedals control the movement of the machine, enabling you to navigate the job site with ease. It's very important to take your time when first learning, so that you don't cause an accident.
The instrument panel provides vital information about the machine's operating status, including engine temperature, hydraulic pressure, and fuel level. Regularly monitor these gauges to ensure that the machine is operating within safe parameters. Various switches control lights, windshield wipers, and other auxiliary functions. The throttle controls engine speed, allowing you to adjust power output as needed for different tasks. Mastery of these controls is paramount for maximizing the productivity and safety of your John Deere 85G.
Efficient and effective digging techniques are crucial for maximizing productivity and minimizing wear and tear on your John Deere 85G. Always plan your excavation carefully, considering the soil conditions, depth of cut, and proximity to underground utilities. Use the boom, stick, and bucket in a coordinated manner to achieve smooth and controlled digging motions. Avoid overextending the machine's reach, as this can reduce stability and increase the risk of tipping.
Maintain a proper angle of attack with the bucket to optimize digging force and prevent unnecessary strain on the hydraulic system. When digging in hard or rocky soil, use the bucket teeth to break up the material before attempting to scoop it up. Avoid excessive scraping or dragging of the bucket across the ground, as this can accelerate wear. Regularly inspect the bucket teeth for damage or wear, replacing them as needed to maintain optimal digging performance. By adhering to these best practices, you can significantly extend the life of your machine and improve your overall digging efficiency.
Transporting the John Deere 85G safely and legally requires careful planning and adherence to specific guidelines. Always consult your local regulations and obtain any necessary permits before transporting the machine. Choose a suitable trailer with adequate load capacity and securement points. Ensure that the excavator is properly positioned on the trailer to distribute the weight evenly and prevent shifting during transit.
Use heavy-duty chains or straps to secure the machine to the trailer, ensuring that they are tightened adequately to prevent movement. Check the chain tension frequently during the journey and re-tighten as needed. When loading or unloading the machine, use ramps with a gradual slope to avoid sudden jolts or impacts. Exercise extreme caution when operating the machine near overhead power lines or other obstacles. By following these transportation guidelines diligently, you can minimize the risk of accidents and ensure the safe and legal transport of your John Deere 85G.
Consistent daily checks are the cornerstone of preventative maintenance and ensuring the longevity of your John Deere 85G excavator. These quick tasks can identify potential problems before they escalate into costly repairs and downtime. Before each day's operation, carefully inspect the machine for any signs of leaks, damage, or unusual wear. This includes walking around the entire machine, paying close attention to hydraulic hoses, cylinders, and undercarriage components. A proactive approach to daily maintenance allows you to address minor issues promptly, keeping your machine running smoothly and efficiently.
Specifically, you should visually inspect all fluid levels, including engine oil, hydraulic fluid, coolant, and fuel. Top off any fluids as needed, using the correct type and specification recommended in your operator's manual. Check the condition of the air filter restriction indicator; if the indicator shows a restricted airflow, clean or replace the air filter as necessary. Furthermore, examine the condition of the bucket teeth and cutting edges for any signs of wear or damage. Replace worn or broken teeth immediately to maintain optimal digging performance.
In addition to daily checks, a more thorough weekly maintenance routine is essential for maintaining the performance and reliability of your John Deere 85G. Weekly tasks involve a more in-depth inspection of critical components and systems, requiring a bit more time and attention to detail. These procedures help to catch potential problems before they turn into major mechanical failures and maintain the overall health of the excavator. Regular weekly maintenance ensures that your machine is always ready to tackle any job.
A primary weekly task involves greasing all lubrication points on the machine, following the lubrication chart in your operator's manual. This ensures that moving parts are properly lubricated, reducing friction and wear. Check the tightness of all bolts and nuts, especially on the undercarriage and around the engine. Tighten any loose fasteners to prevent component failure. Additionally, inspect the condition of the tracks and adjust the track tension if necessary to ensure proper alignment and prevent excessive wear.
Monthly maintenance tasks are designed to provide an even deeper level of inspection and care for your John Deere 85G. These tasks go beyond the routine daily and weekly checks, focusing on more complex systems and components. This ensures that your machine maintains peak performance, reduces the risk of unexpected breakdowns, and extends the overall life of the excavator. Properly executed monthly maintenance is a vital investment in the longevity and reliability of your equipment.
One crucial monthly task is to inspect the engine belts and hoses for cracks, wear, or damage. Replace any worn or damaged belts or hoses to prevent engine failure or coolant leaks. Check the condition of the hydraulic oil filter and replace it if necessary, following the recommended replacement interval in your operator's manual. Inspect the battery terminals for corrosion and clean them if necessary to ensure proper electrical connections. Finally, inspect and clean the radiator fins to ensure proper engine cooling.
Proper lubrication is absolutely vital for maintaining the performance and extending the lifespan of your John Deere 85G. Lack of lubrication leads to increased friction, excessive wear, and premature failure of moving parts. Understanding the location of all lubrication points and adhering to the recommended lubrication schedule is crucial for preventing costly repairs and downtime. Always consult your operator's manual for the specific lubrication chart and recommended lubricants for your machine.
Common lubrication points include the boom pivot points, bucket linkage, swing bearing, and undercarriage rollers. Use a high-quality grease specifically designed for heavy equipment applications. The frequency of lubrication depends on the operating conditions, but generally, all lubrication points should be greased at least weekly, or more frequently in dusty or harsh environments. Ensure that you wipe off the grease fittings before and after greasing to prevent contamination. Proper lubrication practices are essential for ensuring smooth operation and reducing wear on critical components.
Maintaining the proper fluid levels and replacing fluids at the recommended intervals are essential for the optimal performance and longevity of your John Deere 85G. Each fluid system plays a critical role in the machine's operation, and neglecting fluid maintenance can lead to serious mechanical problems. Regularly checking fluid levels and replacing fluids when necessary helps to ensure smooth operation, prevent damage to critical components, and maximize the lifespan of your excavator. Always refer to your operator's manual for specific fluid recommendations and replacement intervals.
Key fluid systems to monitor include the engine oil, hydraulic fluid, coolant, and fuel. Check the engine oil level daily and top off as needed, using the correct grade of oil specified in your operator's manual. Inspect the hydraulic fluid level and add fluid if necessary, ensuring that you use the correct type of hydraulic fluid. Check the coolant level and add coolant if needed, maintaining the proper coolant-to-water ratio. Replace all fluids at the recommended intervals, as specified in your operator's manual.
Replacing filters at the recommended intervals is crucial for maintaining the cleanliness and performance of your John Deere 85G's vital systems. Filters are designed to remove contaminants from fluids and air, preventing damage to critical components. Neglecting filter replacements can lead to reduced performance, increased wear, and ultimately, premature failure of expensive parts. Regularly replacing filters is a simple and cost-effective way to protect your investment and ensure the long-term reliability of your machine.
Key filters to replace include the engine oil filter, hydraulic oil filter, air filter, fuel filter, and coolant filter (if equipped). Consult your operator's manual for the recommended replacement intervals for each filter. Always use genuine John Deere filters or equivalent quality aftermarket filters to ensure proper filtration and protection. When replacing filters, be sure to properly dispose of the old filters according to local regulations.
Before diving into complex repairs, a systematic approach to identifying the problem is crucial. Start by gathering information. What were the circumstances leading up to the failure? What specific symptoms are you observing? Are there any unusual noises, smells, or leaks? This initial assessment can significantly narrow down the potential causes, saving you time and preventing unnecessary disassembly. Don’t underestimate the power of a thorough visual inspection. Check for obvious signs of damage, wear, loose connections, or contamination.
Consulting the operator's manual for common issues specific to the John Deere 85G model is also a recommended step. Many operator manuals include troubleshooting charts addressing frequent problems and their potential solutions. These charts provide a structured way to check common culprits like low fluid levels, blocked filters, or faulty sensors. Always prioritize safety when inspecting the machine. Ensure the engine is off, the parking brake is engaged, and any hydraulic pressure is released before commencing any inspection or repair work. A careful initial assessment prevents wasted time and resources and lays the groundwork for a successful repair.
Engine problems can manifest in various ways, including difficulty starting, rough idling, lack of power, excessive smoke, or unusual noises. Begin by checking the basics: fuel level, air filter condition, and battery charge. A simple clogged air filter can dramatically reduce engine performance. Ensure the fuel shut-off valve is open and that the fuel reaching the injection pump is clean and free of contaminants. Battery voltage should be tested under load to verify its ability to deliver sufficient current for starting. If these basic checks are satisfactory, a deeper investigation may be necessary.
If the engine is difficult to start, check the glow plugs (if equipped) for proper function. A faulty glow plug will hinder cold starts, particularly in colder climates. A compression test can reveal worn piston rings or damaged valves, both of which can lead to poor combustion and reduced power. Unusual engine noises, such as knocking or tapping, may indicate more serious internal problems, such as worn bearings or damaged connecting rods. In such cases, further diagnostics and professional assistance are often required. Never ignore unusual sounds emanating from the engine; early diagnosis can prevent catastrophic failure.
Hydraulic system issues can manifest as slow or weak operation of hydraulic functions (boom, arm, bucket), erratic movements, unusual noises (whining or groaning), or leaks. Begin by visually inspecting all hydraulic lines and connections for leaks. Even small leaks can reduce system pressure and performance. Check the hydraulic fluid level in the reservoir and ensure it is within the recommended range. Low fluid levels can lead to cavitation (air bubbles in the fluid), which damages hydraulic components and reduces efficiency. Examine the hydraulic filter for contamination. A clogged filter restricts flow and can cause the system to overheat.
If no obvious leaks or fluid level problems are detected, use a pressure gauge to test the hydraulic system pressure at various points, as indicated in the John Deere 85G service manual. Low pressure indicates a problem with the hydraulic pump, pressure relief valve, or other components. Erratic movements may be caused by air in the system or a malfunctioning control valve. Purge the system of air according to the manufacturer's instructions. Always wear appropriate personal protective equipment (PPE), including safety glasses and gloves, when working with hydraulic systems, as hydraulic fluid under pressure can be dangerous. Understanding the hydraulic circuit diagrams can be incredibly helpful.
Electrical problems can cause a wide range of issues, from starting problems to malfunctioning lights and instruments. Begin by inspecting the battery terminals for corrosion and ensuring they are securely connected. A loose or corroded connection can impede current flow and prevent the engine from starting. Check all fuses and relays for continuity. A blown fuse or faulty relay can disable various circuits. Use a multimeter to test for voltage and continuity in suspected circuits. Refer to the wiring diagrams in the service manual to trace the circuit and identify potential points of failure.
If the starting system is malfunctioning, check the starter motor and solenoid for proper operation. A faulty starter motor may fail to crank the engine, while a malfunctioning solenoid may prevent the starter from engaging. If lights or other electrical accessories are not working, check the corresponding switches and wiring for damage or loose connections. Remember to disconnect the battery's negative terminal before working on any electrical components to prevent short circuits and electrical shocks. Clean all electrical connections thoroughly to ensure proper conductivity and prevent future problems.
Before removing any component, carefully review the service manual for specific instructions and torque specifications. Incorrect removal or installation can damage the component or surrounding parts. Ensure you have the necessary tools and equipment before starting the job. Trying to force a component without the proper tools can lead to damage and injury. Always disconnect the battery's negative terminal before removing any electrical components to prevent short circuits.
When removing hydraulic components, relieve the hydraulic pressure in the system before disconnecting any lines. Failure to do so can result in hydraulic fluid being ejected under high pressure, causing serious injury. Label all wires and hoses before disconnecting them to ensure proper reassembly. Take pictures as you disassemble the components to have a visual reference for reassembly. After installing a new component, verify its proper operation before putting the machine back into service. Tighten all fasteners to the specified torque to prevent leaks or loosening over time.
Modern John Deere 85G excavators are equipped with electronic control units (ECUs) that monitor various system parameters and generate diagnostic codes when a fault is detected. These codes can provide valuable information for troubleshooting problems. Consult the service manual for a list of diagnostic codes and their corresponding descriptions. Most John Deere machines have a way to retrieve the codes using the instrument panel display. Some may require a diagnostic tool like Service ADVISOR to pull the codes.
Once you have retrieved the diagnostic code, use the service manual to identify the affected system and the potential causes of the fault. The service manual will often provide specific troubleshooting procedures for each diagnostic code. Follow these procedures carefully to isolate the problem and determine the necessary repairs. Keep a record of all diagnostic codes and the repairs performed. This information can be helpful for future troubleshooting and can help prevent recurring problems. Remember to clear the diagnostic codes after completing the repairs.
Navigating the John Deere 85G's parts catalog is crucial for efficient maintenance and repairs. Accessing the correct parts information ensures accurate ordering and minimizes downtime. John Deere offers an online parts catalog, accessible through their official website, requiring a user account for access. This digital catalog allows you to search by model number (85G), part number, or keyword, offering a comprehensive view of all available components. Furthermore, your local John Deere dealer can provide assistance in accessing the parts catalog and confirming part compatibility. Utilizing these resources will ensure you identify and order the correct parts for your machine.
Within the online catalog, you will find exploded diagrams showcasing the assembly of various machine systems. These diagrams provide a visual representation of each part's location and relationship to other components. Always verify the machine's serial number when ordering parts, as minor variations can exist within the 85G model line. Different configurations and year models can have slightly different components, so using the serial number will ensure that you get the part for your exact machine. Many parts descriptions will also include notes about the exact machine configurations they are intended for. Cross-referencing part numbers with your existing components is also a useful method for confirming the correctness of your order.
Understanding the engine parts diagram is essential for troubleshooting and repairing engine-related issues. The diagram illustrates the location and relationship of components such as the cylinder head, pistons, crankshaft, fuel injectors, and turbocharger. Visualizing the engine's internal workings allows for more accurate diagnosis of problems like low compression, fuel leaks, or unusual noises. John Deere provides detailed engine parts diagrams for the 85G, often broken down into sub-assemblies like the fuel system, cooling system, and lubrication system.
The engine parts diagram also identifies critical components for routine maintenance, such as filters, belts, and hoses. Regularly inspecting these parts, as indicated by the diagram, can prevent major engine failures and extend the engine's lifespan. Always consult the engine's service manual in conjunction with the parts diagram when performing repairs. Doing so will give you a more comprehensive idea of how to properly make the repairs. Additionally, keep in mind that certain engine repairs require specialized tools and training. Avoid attempting complex repairs without the proper knowledge and equipment to prevent further damage.
The hydraulic system diagram is vital for diagnosing and repairing hydraulic issues, such as leaks, pressure loss, or slow response times. This diagram shows the layout of hydraulic pumps, valves, cylinders, and hoses, revealing the flow of hydraulic fluid throughout the system. Studying the hydraulic system diagram enables you to trace potential problems back to their source. A good understanding of the hydraulic system helps prevent costly mistakes. These systems are complex and require patience to maintain.
Specific components like the main control valve, pilot valves, and individual cylinder circuits are clearly illustrated in the diagram. These representations allow you to isolate specific sections of the hydraulic system for testing and repair. When replacing hydraulic components, always ensure compatibility with the existing system specifications. Mixing components that are not rated for the same pressure and flow rates can cause catastrophic damage and present safety hazards. Before working on any part of the hydraulic system, make sure the machine is shut off and hydraulic pressure is released to prevent injury.
The electrical system diagram provides a comprehensive overview of the wiring harness, sensors, relays, and electrical components within the John Deere 85G. Understanding this diagram is essential for troubleshooting electrical issues such as starting problems, malfunctioning lights, or sensor failures. The electrical system diagram identifies the location and function of each electrical component, helping technicians trace circuits and diagnose faults efficiently. This can save time and money when finding the problem.
The diagram clearly indicates the wiring color codes, fuse locations, and ground points, crucial for accurate troubleshooting and repairs. When working on electrical systems, always disconnect the battery to prevent short circuits and electrical shocks. Before replacing any electrical component, test the circuit with a multimeter to confirm the component is faulty and not simply a symptom of a different issue. Always refer to the service manual for detailed instructions on testing and replacing electrical components to prevent damage to the system or the machine. Always use genuine parts when possible.
The undercarriage parts diagram is crucial for maintaining the machine's mobility and stability. This diagram illustrates the various components of the undercarriage, including the tracks, rollers, sprockets, idlers, and track tensioning system. Regularly inspecting these parts and referencing the diagram will help identify wear and damage early on. This will prevent more serious problems from occurring. Knowing the location of each part also makes maintenance easier.
The diagram will help you locate the adjustment points for proper track tensioning, which is essential for optimal performance and longevity of the undercarriage components. Regular lubrication of rollers and idlers is also crucial, and the diagram highlights the location of grease fittings. It’s best to use the grease recommended by John Deere, and never use too much grease at one time. When replacing worn undercarriage parts, ensure compatibility with the machine's specifications. Non-compatible parts can compromise the undercarriage's performance and safety.
Properly preparing your John Deere 85G for extended storage is crucial to ensuring its reliable performance when you're ready to put it back to work. Neglecting this step can lead to corrosion, component degradation, and ultimately, costly repairs. The first step involves a thorough cleaning of the machine, removing all accumulated dirt, mud, and debris. Pay close attention to areas where moisture tends to collect, such as around seals, hoses, and electrical connections. A clean machine not only helps prevent corrosion but also makes it easier to spot potential issues during inspection.
Next, perform a complete fluid service. This includes changing the engine oil, hydraulic oil, and coolant, as well as replacing all filters. Used oil and coolant can contain acids and contaminants that can corrode internal components over time. Fresh fluids provide a protective barrier against corrosion and help maintain the integrity of the engine and hydraulic system. Be sure to consult your operator's manual for the correct fluid specifications and service intervals for your John Deere 85G. Lastly, fully fuel the tank to prevent condensation and algae growth inside, and add a fuel stabilizer to prevent fuel degradation.
Choosing the right storage location is just as important as preparing the machine itself. Ideally, the John Deere 85G should be stored in a dry, sheltered environment, such as a garage or shed. Protecting the machine from the elements helps prevent corrosion, sun damage, and the accumulation of snow and ice. If indoor storage is not an option, consider using a waterproof cover to shield the machine from the weather. Ensure the cover is breathable to prevent moisture buildup underneath, which can be just as damaging as direct exposure to rain or snow.
If storing outdoors, select a location that is level, well-drained, and away from trees or overhanging structures that could drop debris onto the machine. Elevating the machine slightly on blocks can further protect it from ground moisture. Disconnect the battery and store it in a cool, dry place to prevent it from discharging during storage. Applying a coat of grease to exposed metal surfaces, such as cylinder rods and pivot points, can also help protect them from corrosion. Regularly inspecting the machine during storage is advisable, even when sheltered, to identify any potential problems early on.
Before starting the John Deere 85G after a period of storage, a thorough inspection is essential to ensure everything is in good working order. Begin by checking all fluid levels, including engine oil, hydraulic oil, coolant, and fuel. Top up any fluids as needed. Inspect all hoses, belts, and electrical connections for signs of damage or deterioration. Look for cracks, leaks, or loose connections, and replace any worn or damaged components before starting the machine.
Reconnect the battery and check its voltage to ensure it is fully charged. If the battery has been stored for a long period, it may need to be recharged before use. Before attempting to start the engine, prime the fuel system by cycling the key to the "on" position several times to allow the fuel pump to fill the fuel lines. Once the engine is running, allow it to idle for several minutes to warm up before putting it under load. Monitor the engine temperature and oil pressure gauges to ensure they are within the normal operating range. Finally, operate all hydraulic functions and check for any leaks or unusual noises. If any issues are detected, address them promptly before resuming normal operation.