Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
John Deere 750J Dozer Troubleshooting Guide
#1
The John Deere 750J dozer is a robust and reliable machine, widely used in construction, mining, and land reclamation projects. However, like any heavy equipment, it can experience issues that may affect its performance. This guide provides an in-depth look at common problems faced by 750J dozer operators, along with troubleshooting steps and maintenance tips to ensure optimal performance.
Common Issues and Troubleshooting
  1. Hydraulic Pressure Loss
A significant issue reported by operators is the sudden loss of hydraulic pressure. This can occur after a hydraulic hose failure, leading to a complete loss of hydraulic function. In one instance, replacing the hydraulic relief valve and pump did not resolve the issue. Further investigation revealed that debris had caused a valve to stick open, located between the batteries and the hydraulic filter. Cleaning the valve restored hydraulic function, highlighting the importance of thorough inspection and cleaning during repairs.
  1. Engine Misfire When Warm
Some 750J dozers experience engine misfires or rough idling after the engine warms up. This problem can stem from several sources, including:
  • Fuel Delivery Issues: A weak fuel lift pump can cause air to enter the fuel system, leading to misfires. Checking the fuel lift pump for consistent pressure is essential.
  • Injector Problems: Faulty injectors or poor injector timing can disrupt engine performance. Inspecting and testing injectors can help identify such issues.
  • Sensor Malfunctions: A malfunctioning coolant temperature sensor can cause incorrect fuel mapping, leading to engine problems. Testing the sensor and replacing it if necessary can resolve this issue.
Regular maintenance, including draining water or contaminants from the fuel tank and replacing filters, can prevent these problems.
  1. Track Misalignment and Steering Issues
After replacing hydraulic components like hydro pumps or power shaft couplings, operators have reported track misalignment and unexpected track stoppages. This often indicates the need for track calibration. The calibration process involves:
  • Adjusting Steering Control Valves: Ensuring that the steering control valves are properly adjusted can correct steering issues.
  • Verifying Track Tension: Proper track tension is crucial for smooth operation. Adjusting the track tension as per the manufacturer's specifications can resolve alignment problems.
  • Checking Hydraulic Fluid Levels: Low or contaminated hydraulic fluid can affect track performance. Ensuring that the hydraulic fluid is at the correct level and in good condition is vital.
  1. Overheating Issues
Overheating can occur rapidly in 750J dozers, often due to thermostat or radiator blockages. Common causes include:
  • Sticking Thermostat: A thermostat that doesn't open or closes too early can restrict coolant flow, leading to overheating. Testing the thermostat by removing it and placing it in hot water can determine if it's functioning correctly.
  • Radiator Blockages: Debris or sediment in the radiator can impede airflow, causing the engine to overheat. Inspecting and cleaning the radiator can prevent this issue.
  • Faulty Head Gasket: A head gasket failure can allow combustion gases into the cooling system, disrupting coolant flow. Checking for signs of a blown head gasket and replacing it if necessary can resolve this problem.
Maintenance Tips
To minimize the risk of these issues, regular maintenance is essential:
  • Regularly Inspect and Replace Filters: Fuel, air, and hydraulic filters should be inspected and replaced as per the manufacturer's recommendations to ensure optimal performance.
  • Monitor Fluid Levels and Quality: Regularly check the levels and condition of engine oil, hydraulic fluid, and coolant. Low or contaminated fluids can lead to various mechanical issues.
  • Clean Radiator and Cooling System: Periodically clean the radiator and cooling system to prevent overheating and ensure efficient engine operation.
  • Calibrate Tracks and Steering System: After major repairs or component replacements, calibrate the tracks and steering system to maintain proper alignment and functionality.
  • Check Electrical Components: Inspect sensors, wiring, and control modules for signs of wear or damage. Faulty electrical components can lead to performance issues.
Conclusion
The John Deere 750J dozer is a powerful and versatile machine, but like any complex piece of equipment, it requires regular maintenance and timely troubleshooting to ensure reliable operation. By understanding common issues and implementing proactive maintenance practices, operators can extend the lifespan of their dozers and maintain high productivity levels on the job site.
Reply


Possibly Related Threads…
Thread Author Replies Views Last Post
  Diagnosing Clutch Plate Movement in the Caterpillar D6H Dozer MikePhua 0 1 4 minutes ago
Last Post: MikePhua
  Rebuilding a Tilt Cylinder: A Comprehensive Guide MikePhua 0 1 5 minutes ago
Last Post: MikePhua
  Komatsu PC300-7 Hydraulic Fault: Troubleshooting and Solutions MikePhua 0 1 8 minutes ago
Last Post: MikePhua
  Bomag BW177 D-5 Vibrator Not Working: Troubleshooting and Solutions MikePhua 0 3 9 minutes ago
Last Post: MikePhua
  Case 450 Dozer Brake Troubleshooting and Restoration MikePhua 0 3 10 minutes ago
Last Post: MikePhua
  Troubleshooting and Problem Solving in Heavy Equipment: A Case Study Approach MikePhua 0 3 13 minutes ago
Last Post: MikePhua
  Troubleshooting Arm Cylinder Issues in Heavy Equipment MikePhua 0 1 17 minutes ago
Last Post: MikePhua
  Case SR250 Dash Fault Code: Troubleshooting and Solutions MikePhua 0 3 22 minutes ago
Last Post: MikePhua
  Can a Faulty Deere ECM Be Repaired Outside the Dealership MikePhua 0 3 26 minutes ago
Last Post: MikePhua
  Mitsubishi BD2G Steering Issues: Troubleshooting and Solutions MikePhua 0 4 32 minutes ago
Last Post: MikePhua
  John Deere 35D Travel Levers in Freezing Temperatures: Issues and Solutions MikePhua 0 3 33 minutes ago
Last Post: MikePhua
  Caterpillar 418C Mulcher: Troubleshooting and Maintenance MikePhua 0 7 34 minutes ago
Last Post: MikePhua
  Troubleshooting Heavy Equipment Issues: A Comprehensive Guide MikePhua 0 8 1 hour ago
Last Post: MikePhua
  New Holland LS180 Cover Plates: Importance, Troubleshooting, and Solutions MikePhua 0 11 1 hour ago
Last Post: MikePhua
  Understanding D6R Service Codes: Troubleshooting and Solutions MikePhua 0 7 1 hour ago
Last Post: MikePhua

Forum Jump:


Users browsing this thread: 1 Guest(s)