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John Deere 3020 Troubleshooting

The John Deere 3020 is a New Generation series row crop tractor. This model was manufactured from 1964 to 1972. The JD 3020 tractor is powered by 270 cubic inches (4.4 L) John Deere 4-cylinder water cooled diesel engine with a rated power of 77 hp (57 kW), or 227 cubic inches (3.7 L) John Deere 4-cylinder water cooled gasoline engine with a rated power of 76 hp (56.3 kW).

The John Deere 3020 was fitted with 2 types of transmission. Type 1: 8x2 syncro-range partially synchronized transmission. Type 2: Powershift transmission with 8 forward and 4 reverse gears.

The maximum forward speed - 19.5 mph (31.4 km/h), max. reverse speed - 6.2 mph (10 km/h). The closed center hydraulic system includes a gear pump with rated capacity of 14 gpm (53 lpm). The hydraulic system pressure is 145 bar (2100 psi). The tractor was equipped with 6.00x16 or 7.50x15 front tires and 13.6x38 or 15.5x38 rear tires. The wheelbase is 90" (2280 mm).

The John Deere 3020 is compatible with JD 48 loader with a liftting capacity to full height of 2400 lbs (1088 kg), or JD 148 loader with a lifting capacity to full height of 3100 lbs (1406 kg).

Diesel Engine Troubleshooting
Engine won't start or difficult to start
Fuel filter is clogged - Clean the filter or install new filter element
Fuel supply valve is closed - Open fuel supply valve
Air in fuel pipes - Bleed fuel pipes
Fuel injectors are clogged or faulty - Inspect fuel injectors and replace if necessary
Fuel injection pump is faulty - Change pump or rebuild it
Bad cylinder compression - Check cylinder block and replace damaged components
Engine stops running unexpectedly
Low coolant temperature - Engine is not warmed up to the required temperature
There is air in the fuel system - Bleed the system
Fuel injection failed - Use correct settings
Dirty fuel filter element - Change the filter element
Dirty or faulty injectors - Inspect fuel injectors and replace if necessary
Diesel starts and stalls suddenly
Timing of fuel injection pump is not adjusted - Check and correct settings
Fuel filter plugging - Change the filter element
Fuel injector nozzles are dirty or defective - Service or replace injector nozzles
Fuel injection pump is defective - Replace or repair injection pump
Clogged air cleaner - Replace or service air cleaner element
Engine stalling at idle
Improperly adjusted low idle speed - Correct low idle adjustment
Damaged fuel injection pump - Repair or replace injection pump
Dirty or defective injector nozzles - Change or clean injector nozzles
The valve clearance is incorrect - Adjustment procedure required
Engine is overheated
Low engine coolant - Add the coolant. Inspect the system for leaks
Cooling system components are worn or system is clogged - Service the cooling system or replace faulty components
Lack of engine oil - Check and refill engine oil
Fan belt is broken or belt tension is unadjusted - Adjust as required or change belt
Thermostat fault - Thermostat needs to be replaced
Lack of engine power
Dirty or faulty injectors - Service or change fuel injectors
Fuel injection pressure is incorrect - Adjust pressure to proper level
Dirty air filter - Air filter maintenance required
Oil filter is dirty - Replace or service engine oil filter
Diesel engine is overloaded - Reduce engine load
Valve clearance is wrong - Adjust to proper valve clearance
Low idle speed set incorrectly - Test and adjust
Clogged fuel pipes or hoses - Clean fuel system pipes and hoses
Engine compression is insufficient: Intake or exhaust valves are damaged - Valves need to be replaced
Engine knocks or noises
Timing of fuel injection pump is wrong - Adjust the fuel injection pump timing correctly
Dirty or defective injector nozzles - Install new set of properly balanced nozzles
Lack of engine oil - Check oil level and add oil as required
Engine is cold - Normalize the temperature by warming up the engine
Worn crankshaft or main bearings - Replace crankshaft or bearings
Worn or broken piston rings - Have piston rings replaced
The flywheel to crankshaft bolts are loose - Tighten bolts as required
Excessive oil consumption
External oil leaks: Worn seals or gaskets - Change worn parts according to specifications
Oil viscosity is incorrect - Fill up with the correct oil viscosity
Worn or stuck piston rings - Replace piston rings
Valve stems or guides are damaged - Change the valves
Scuffed pistons or cylinder liners - Inspect pistons and liners, change as required

Electrical System Troubleshooting
Battery is not charging
Battery is worn - Use a new battery
Bad battery cable harness - Inspect cables for malfunctions, repair or change
Loose or corroded terminals and cables - Service or tighten battery terminals and cables
Belt slipping or wrong belt tension adjustment - Adjust belt tension correctly or replace belt
Starter turns slow
Low battery voltage - Low battery charging, charge as required
Battery will not hold charge - Service charging system or change battery
Battery cable harness failure - Check battery electrical cable for defects, replace or repair
Corroded or loose battery terminals and cables - Cables and terminals must be tightened or cleaned
Starter does not work
Battery capacity is low - Battery is drained, charge it
Discharged or defective battery - Change or recharge battery
Faulty starter motor - Repair or change starter
Disconnected or incorrectly connected wiring harness - Inspect wiring harness and reconnect it as required

Transmission Troubleshooting
Gears are hard to shift
Misadjusted or defective clutch - Change or adjust clutch
Gear shift linkage is stuck or damaged - Repair or change shift linkage
Damaged or worn shift forks - Replace the shift forks
Defective gearshift mechanism - Replace defective components
Insufficient transmission oil pressure
Not enough fluid in transmission - Fill the transmission housing with fluid
Clogged transmission fluid filter element (if fitted) - Change or clean the transmission fluid filter
Relief valve is defective - Install a new valve
Excessive transmission noise
Cracked or worn bearings - Install new bearings
Low transmission oil level - Add transmission oil as required
Transmission fluid contamination - Transmission fluid must be changed
Damaged gears or improper backlash - Change worn gears or set backlash correctly
Shift forks are worn or damaged - Install new shift forks
Transmission oil leaking
Gaskets or seals are defective Install new gaskets or seal
Cracked transmission housing - Housing needs to be replaced

Hydraulics Troubleshooting
Hydraulic system overheating
Incorrect hydraulic pressure adjustments - Adjust correctly
Main relief valve malfunction or incorrect adjustment - Replace or set up the relief valve
Dirty hydraulic oil - The oil must be changed
Hydraulic system sucks air - Inspect the pump seals, suction pipe, and fittings
Low hydraulic fluid pressure
Lack of hydraulic fluid - Check and refill the hydraulic fluid
Hydraulic fluid filter clogging - Clean or replace the hydraulic filter
Hydraulic pump not working - Test pump performance and replace pump if necessary
Hydraulic control valve block is defective or set improper - Change or adjust correctly
Defective hydraulic cylinder - Inspect cylinder components for wear or damage and change if required
Leakage in hydraulic pipes - Find leaks in hydraulic system and repair it
3-point hitch raises slowly or won't raise
Hydraulic fluid level is low - Add fluid to the hydraulic system
Cold hydraulic oil - Warm up the oil
Hydraulic fluid filter element is dirty - Clean the hydraulic filter or install new filter element
Hydraulic pump not working - Check pump capacity and change if necessary
Main relief valve failure or incorrect setting - Adjust or change relief valve
Defective or not adjusted hydraulic control valve - Change or adjust properly
Hydraulic cylinder malfunction - Inspect cylinder parts for wear or damage and replace if required
Suction pipe is damaged or loose - Repair or change
3-point hitch won't drop or drops slowly
Hydraulic spool valve block is faulty or out of adjustment - Change or set correctly
Hydraulic cylinder is broken - Inspect cylinder components for wear or damage and change if required
Hitch rock shaft is damaged - Change the shaft
The hitch has internal mechanical malfunctions - Replace defective or worn hitch parts
Hitch jerks when lift or lower
Air trapped in the hydraulic system - Check the suction line, pump seals, and fittings
Hydraulic fluid contamination - Change hydraulic fluid
Defective hydraulic pump - Flow-rate hydraulic pump and replace pump if necessary
Faulty or incorrect setting hydraulic spool valve - Adjust correctly or change
Hydraulic cylinder is faulty - Check cylinder parts for wear or damage and replace if necessary

Steering System Troubleshooting
Steering wheel turns hard
Worn or improperly mounted steering column - Mount the steering column properly or change it
Air enters in steering system - Bleed air from system
Improper toe-in adjustment - Adjust toe-in correctly
Low tire pressure - Inflate the tires
Steering pump is faulty - Replace or repair steering pump
Steering valve is worn or defective - Repair or change the steering valve
Faulty steering valve cylinder parts - Change defective steering valve cylinder components
Lack of steering oil - Fill the steering system with oil
Steering system has oil leaks - Retighten steering hose and pipe connections
Excessive play in steering
Steering column shaft or coupling is worn out - Replace defective component
Worn or defective steering valve - Inspect and change as required
Damaged steering valve cylinder components - Change defective steering valve cylinder parts
Steering pump stopped working - Check the hydraulic steering pump and change if necessary
Faulty or worn steering linkage or tie-rod ends - Change damaged part
Tractor is pulling to right or left
Tire pressure is not correct - Check tire pressure and inflate as required
Incorrect toe-in - Adjust toe-in wheels properly
Steering tie-rod ends or linkage are worn - Replace failed component
Faulty or worn steering valve - Change or repair steering valve if required
Defective steering valve cylinder - Repair or replace steering valve cylinder
Damaged or improperly adjusted or worn front hub bearings - Adjust correctly or change bearings




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