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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
Engine stalls when idle
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
Engine overheating
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
Low engine power
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
Engine knocks or noises
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
Starter turns slow
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
Starter will not work
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
Transmission oil leaks
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




Farm Tractors Technical Specifications
JD 1026R JD 3650 JD 6400 JD 7810
FORD 1320 FORD 2810 FORD 3930 FORD 5600
MF 250 MF 690 MF 3060 MF 6180
NH TC48DA NH M100 NH T7550 NH 8560
CASE IH 495 CASE IH 1255XL CASE IH 2140 CASE IH 2294