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John Deere 5020 Troubleshooting
The
John Deere 5020 is a two-wheel drive standard-tread tractor from New Generation
series. This model was manufactured between 1965 and 1972. The John Deere 5020
tractor is equipped with John Deere 4-cycle six-cylinder liquid-cooled diesel
engine.
A 531 cubic inches (8.7 L) engine has a cylinder bore of 4.75" (121 mm),
piston stroke of 5.0" (127 mm), and rated power of 148 hp (109.6 kW).
The Syncro-Range transmission consists of a dry clutch and partially
synchronized gearbox with 8 forward and 2 reverse gears.
The maximum travel speed (forward/reverse): 17.9 mph (28.8 km/h) and 5.4
mph (8.7 km/h). The closed center hydraulic system used a gear pump with
a flow rate of 22 gal/min (83.3 l/min). The main relief pressure is 155
bar (2250 psi). The John Deere 5020 was equipped with a power steering
system, differential hydraulic wet disc brakes, 11.0x16 (Standard) or
9.5x20 (Row-Crop) front tires, and 24.5x32 (Standard) or 18.4x38
(Row-Crop) rear tires. The wheel base is 104 inches (2640 mm).
| Engine Troubleshooting |
| Diesel will not start or hard to start |
| Plugged fuel filter - Service or replace the filter |
| Fuel is not supplied from the tank to the system - Check the fuel shut-off valve |
| Air in fuel lines - Bleed fuel lines |
| Dirty or damaged injectors - Test fuel injectors and change if necessary |
| Fuel injection pump malfunction - Install a new fuel pump or repair |
| Poor engine compression - Check cylinder block and replace damaged components |
| Engine stops running unexpectedly |
| Low coolant temperature - Warm up the engine |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Fuel injection failed - Use correct settings |
| Fuel filter is dirty - Service or replace the filter |
| Fuel injectors are damaged or dirty - Check fuel injectors and replace if required |
| Engine stops after starting |
| Incorrectly set fuel injection pump timing - Adjust injection timing |
| Fuel filter plugging - Clean the filter element |
| Fuel injector nozzles fault - Change injector nozzles |
| Fuel injection pump malfunction - Change or repair the pump |
| Air cleaner is dirty - Replace or clean the air cleaner element |
| Incorrectly set low idle speed - Adjust low idling as recommended |
| Fuel injection pump is not working correctly - Install a new pump or rebuild |
| Faulty fuel injector nozzles - Change injector nozzles |
| Valve out of adjustment - Adjust valve clearance |
| Low coolant level - Refill to the correct level. Check radiator and hoses for leaks |
| Cooling system is clogged or cooling parts are defective - Replace faulty parts or service cooling system |
| Insufficient engine oil - Need to add engine oil |
| Unadjusted fan belt tension or worn belt - Adjust belt tension correctly or change it |
| Thermostat fault - Test thermostat opening temperature, replace as required |
| Fuel injectors are clogged or faulty - Inspect fuel injectors and replace if necessary |
| Improper fuel injection pressure - Check the fuel injection pressure and adjust if necessary |
| Air filter clogging - Change or replace air filter element |
| Engine oil filter is plugged - Replace or clean engine oil filter element |
| Diesel engine overloaded - Reduce the load or operate the tractor in lower gears |
| Valve clearance is not correct - Adjustment procedure required |
| Low idle speed set incorrectly - Need to adjust idle speed |
| Restricted fuel hoses or pipes - Fuel hoses and pipes must be clean |
| Engine compression is low: Inlet or outlet valves are defective - Install new valves |
| Timing of fuel injection pump is wrong - Adjust the fuel injection pump timing correctly |
| Fuel injector nozzles are faulty - Install new set of properly balanced nozzles |
| Engine oil level is insufficient - Fill up the oil to required level |
| Engine is cold - Warm up engine as required |
| Crankshaft or main bearings are worn out - Need to install new components |
| Piston rings failure - Replace the piston rings as required |
| Loose flywheel bolts - Check flywheel bolts and tighten properly |
| Diesel engine using too much oil |
| Oil leaks: Defective seals or gaskets - New components need to be installed |
| Wrong oil viscosity - Use oil of proper viscosity |
| Piston rings are stuck or broken - Replace piston rings |
| Damaged valve stems or valve guides - Valves must be replaced |
| Scuffed pistons or cylinder liners - Inspect pistons and liners, change as required |
| Electrical System Troubleshooting |
| Battery cannot be charged |
| Battery failing - Install a new battery |
| Battery cable harness failure - Check battery electrical cable for defects, replace or repair |
| Battery terminals and cables are corroded or loose - Clean or tighten terminals and cables |
| Belt is defective or belt tension is improperly adjusted Adjust belt tension correctly or replace belt |
| Low battery voltage - Battery needs to be recharged |
| Battery is not holding charge - Service battery or replace it |
| Battery electrical wire harness damage - Check battery wires for damage, replace or change |
| Loose or corroded cables and terminals - Clean or tighten terminals and cables |
| Low battery output voltage - Low battery charging, charge as required |
| Drained or faulty battery - Recharge or replace battery |
| Starter motor failing - Repair or change starter |
| Wiring harness is disconnected or improperly connected - Check wiring harness and reconnect properly |
| Transmission Troubleshooting |
| Gear shift is hard |
| Clutch is not adjusted or faulty - Change or adjust clutch |
| Loose or broken gear shift linkage - Change or repair shift linkage |
| Shift forks are worn or damaged - Shift forks need to be replaced |
| Worn gear shift mechanism - Replace worn components |
| Insufficient transmission oil pressure |
| Oil level is low - Fill up the transmission oil |
| Transmission fluid filter is dirty (if equipped) - Replace or clean transmission fluid filter |
| Relief valve failure - Replace relief valve |
| Transmission is excessively noisy |
| Bearings are worn or cracked - Change the bearings |
| Not enough oil in transmission - Fill up the transmission oil |
| Dirty transmission fluid - Change transmission fluid |
| Worn gears or improper backlash - Change worn gears or set backlash correctly |
| Damaged or worn shift forks - Shift forks need to be replaced |
| Gaskets or seals are damaged - Seals and gaskets need to be replaced |
| Cracked transmission housing - Housing needs to be replaced |
| Hydraulics Troubleshooting |
| Hydraulic system is too hot |
| Incorrect pressure in hydraulic system - Changing the system pressure |
| Misadjusted or defective main relief valve - Set up or change the relief valve |
| Contaminated hydraulic oil - Change hydraulic oil |
| Air enters in hydraulic system - Inspect the suction line, pump seals, and fittings |
| Low hydraulic fluid pressure |
| Hydraulic oil level is low - Check oil level and add hydraulic oil as required |
| Hydraulic oil filter element clogging - Replace filter element or clean if required |
| Damaged hydraulic oil pump - Test the pump flow rate and install new pump if required |
| Defective or incorrect setting hydraulic spool valve block - Adjust correctly or change |
| Hydraulic cylinder is defective - Inspect cylinder components for damage or wear and change if required |
| Leakage in hydraulic lines - Detect leaks in the system and fix it |
| 3-point hitch won't raise or raises slowly |
| Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid |
| Hydraulic oil is too cold - Allow oil to warm |
| Hydraulic fluid filter is dirty - Change hydraulic filter element or clean if necessary |
| Damaged hydraulic oil pump - Test pump flow rate and replace pump if required |
| Misadjusted or defective main relief valve - Set up or change the relief valve |
| Hydraulic control valve is not set properly or defective - Adjust correctly or change |
| Hydraulic cylinder is broken - Inspect cylinder components for damage or wear and change if required |
| Suction line is damaged or disconnected - Connect or replace |
| Hitch not dropping or hitch drops slowly |
| Hydraulic spool valve is faulty or out of adjustment - Adjust properly or replace |
| Hydraulic cylinder malfunction - Inspect cylinder components for wear or damage and change if required |
| Worn hitch cross shaft - Install a new shaft |
| Mechanical components of the hitch are defective - Replace damaged or worn hitch parts |
| Three-point hitch raises or lowers not smoothly |
| Aeration in hydraulic system - Inspect the pump seals, suction pipe, and fittings |
| Dirty hydraulic fluid - The fluid must be changed |
| Damaged hydraulic oil pump - Test the pump flow rate and change pump if required |
| Damaged or incorrect adjusted hydraulic control valve - Change or set correctly |
| Hydraulic cylinder is not working - Inspect cylinder components for wear or damage and change if required |
| Steering System Troubleshooting |
| Steering is stiff |
| Steering column is broken or incorrectly fitted - Steering column needs to be refit correctly or replaced |
| Air leaks in steering system - Air-bleed steering system |
| Improper toe-in - Check and adjust toe-in |
| Tire pressure is not correct - Check tire pressure and inflate as required |
| Defective hydraulic steering pump - Install a new hydraulic steering pump |
| Steering valve is worn or defective - Repair or replace the steering valve |
| Relief valve is stuck or defective - Replace or install new relief valve |
| Not enough steering oil - Check oil level and add steering oil as required |
| Steering system has oil leaks - Retighten steering pipe and hose connections |
| Excessive free play of steering wheel |
| Worn steering column shaft or coupling - Change faulty component |
| Steering valve is damaged or worn - Check and replace as required |
| Steering pump not working - Install a new steering pump |
| Steering tie-rod ends or linkage are worn - Replace damaged component |
| Tractor is pulling to right or left |
| Tires are deflated - Need to inflate tires |
| Improper toe-in - Check and adjust toe-in |
| Steering linkage or tie-rod ends are defective - Replace failed component |
| Steering valve is worn or defective - Inspect and change as required |
| Steering cylinder is defective - Replace or repair steering cylinder |
| Defective or improperly adjusted front hub bearings - Change or adjust bearings correctly |
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| Farm Tractors Technical Specifications |
