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Home / Farm Tractors / John Deere Tractors / JD 4230

John Deere 4230 Troubleshooting

The John Deere 4230 is a Generation 2 series row crop tractor. This model was manufactured from 1973 to 1977. The JD 4230 powerline system components: John Deere 4 cycle 6-cylinder diesel engine and 16x6 Quad-Range partial power shift and synchronized transmission, or 8x4 full power shift transmission, and 8x2 Syncro Range partially synchronized transmission.

A 404 cu.in (6.6 L) engine power rating is 111 hp (80.5 kW) at 2200 rpm. Maximum forward speed - 20.5 mph (33 km/h), maximum reverse speed - 10.5 mph (16.9 km/h).

The closed center hydraulic system includes a piston pump with a rated fluid flow of 23 gal/min (87 l/min). The hydraulic system pressure is 170 bar (2500 psi). The John Deere 4230 is fitted with 11.0x16 or 9.5Lx15 front tires and 18.4x26 or 23.1x26 rear tires. The wheelbase is 104" (2640 mm). The tractor can be equipped with the following front end loaders: John Deere 148 loader with a lift capacity to maximum height of 3100 lbs (1405 kg), or John Deere 158 loader with a lift capacity to full height of 3800 lbs (1725 kg).

Diesel Engine Troubleshooting
Engine won't start or starts hard
Clogged fuel filter element - Filter maintenance required
Fuel supply valve is closed - Open fuel supply valve
Fuel-line is leaking air - Retighten clamps, replace defective pipes
Fuel injectors are clogged or faulty - Clean or replace fuel injectors
Damaged fuel injection pump - Replace injection pump or repair it
Engine has bad compression - Check and change damaged parts
Engine shuts off unexpectedly during operation
Engine is cold - Engine is not warmed up to the required temperature
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system
Improper fuel injection - Fuel injection settings required
Dirty fuel filter element - Clean or replace the filter
Fuel injectors are damaged or dirty - Change fuel injectors
Diesel starts and then stalls
Incorrect setting of fuel injection pump timing - Adjust injection timing
Fuel filter is clogged - Clean or change the filter
Fuel injector nozzles are faulty - Service or replace nozzles if required
Defective fuel injection pump - Rebuild or install a new injection pump
Air cleaner element clogging - Change or service air cleaner element
Engine stops at low idle speed
Incorrectly set low idle speed - Adjustment required
Faulty fuel injection pump - Replace or rebuild injection pump
Fuel injector nozzles are faulty - Check and change nozzles as required
Incorrect valve clearance - Adjust valve clearance
Engine overheated
Lack of engine coolant - Top up coolant fluid. Inspect the system for leaks
Cooling system is clogged or cooling parts are defective - Service the cooling system or change faulty parts
Lack of engine oil - Fill the crankcase with engine oil
Fan belt tension is not adjusted or belt is broken - Adjust belt tension properly or change it
Defective thermostat - Test thermostat opening temperature, replace as required
Diesel power loss
Clogged or damaged injectors - Test fuel injectors and change if necessary
Incorrect fuel injection pressure - Correct the pressure settings
Air filter element is clogged - Clean or replace the air filter element
Oil filter element clogging - Replace or service engine oil filter
Diesel engine overloaded - Load reducing is recommended
Excessive valve clearance - Have it adjusted
Low idle speed setting is incorrect - Adjust the low idle speed
Dirt in the fuel pipes or hoses - Clean fuel pipes and hoses
Engine compression too low: Leaking or broken valves - Valves need to be replaced
Engine knocking or noise
Timing of fuel injection pump is wrong - Adjust injection timing
Damaged or clogged injector nozzles - Install a new set of well-balanced nozzles
Engine oil level low - Check oil level and add oil as required
Engine has not warmed up to the recommended temperature - Warm up to required temperature
Crankshaft or main bearings wear - Need to install new components
Piston rings are defective or broken - Piston rings replacement required
Flywheel screws are loose - Tighten the screws firmly
High oil consumption
Oil leaks: Gaskets or seals may be damaged - To repair leaks, replace worn parts
Oil viscosity is wrong - Use oil of proper viscosity
Piston rings are seized or worn - Change the piston rings as required
Valve stems or guides are damaged - Change the valves
Damaged cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary


Electrical System Troubleshooting
Battery cannot be charged
Battery is defective - Battery change required
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Loose or corroded cables and terminals - Tighten or service cables and terminals
Belt is damaged or belt tension is incorrectly adjusted - Change belt or properly adjust belt tension
Starter turning slow
Low battery output voltage - Battery needs to be recharged
Battery will not hold charge - Service charging system or change battery
Battery electrical wire harness failure - Inspect wires for defects, change or repair
Corroded or loose battery cables and terminals - Tighten or service cables and terminals
Starter doesn't crank
Low battery output voltage - Battery needs to be recharged
Discharged or defective battery - Need to charge or replace the battery
Damaged starter motor - Starter should be changed
Disconnected or incorrectly connected wiring harness - Inspect wiring harness and reconnect it as required

Transmission Troubleshooting
Gear hard to shift
Failure or improper clutch adjustment - Clutch needs to be replaced or adjusted
Gear shift linkage is damaged or loose - Service or replace shift linkage
Shift forks are worn or damaged - Change the shift forks
Gear shifting mechanism is worn - Change worn components
Transmission oil pressure is insufficient
Fluid level is low - Fill the transmission housing with fluid
Clogged transmission oil filter (if equipped) - Replace or clean transmission oil filter
Relief valve is defective - Replace valve as required
Transmission is making noise
Broken or worn bearings - Change faulty bearings
Fluid level is low - Check transmission fluid level and add it as required
Contaminated transmission fluid - Fill up with fresh transmission fluid
Damaged gears or improper backlash - Set backlash correctly or change the gears
Shift forks are worn or damaged - Change defective shift forks
Transmission fluid leaking
Worn gaskets or seals - Install new seal or gaskets
Cracked transmission housing - Housing needs to be replaced


Hydraulics Troubleshooting
Hydraulic system overheats
Improper pressure in hydraulic system - Adjust properly
Main relief valve incorrect adjustment or failure - Adjust the valve or replace if necessary
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil
Air in hydraulic system - Inspect the pump seals, suction pipe, and fittings
Insufficient hydraulic fluid pressure
Hydraulic fluid level is low - Check and refill the hydraulic fluid
Hydraulic fluid filter is clogged - Change hydraulic filter element or clean if necessary
Faulty hydraulic oil pump - Check pump flow and change pump if necessary
Faulty or incorrect setting hydraulic spool valve - Replace or set correctly
Hydraulic cylinder failure - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hydraulic pipes are leaking - Find leaks in the system and fix it
3-point hitch lifts slowly or won't lift
Hydraulic oil level is insufficient - Fill up the hydraulic oil
Hydraulic fluid is too cold - Allow fluid to warm
Hydraulic fluid filter is clogged - Service the hydraulic filter or change if required
Faulty hydraulic oil pump - Test pump flow rate and replace pump if required
Faulty or incorrectly adjusted main relief valve - Replace or set up the relief valve
Defective or incorrect setting hydraulic spool valve block - Adjust properly or change
Defective hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Damaged or loose suction line - Tighten or change
3-point hitch lowers slowly or won't lower
Hydraulic control valve is faulty or out of adjustment - Change or adjust correctly
Hydraulic cylinder is faulty - Check cylinder components for damage or wear and change if necessary
Lift arm shaft is worn - Change the shaft
The hitch has mechanical faults - Change damaged or worn hitch parts
Hitch lowering or lifting is not smoothly
Hydraulic system sucks air - Inspect the pump seals, suction pipe, and fittings
Contaminated hydraulic oil - Change hydraulic oil
Hydraulic pump is faulty - Flow-rate pump and change pump if necessary
Damaged or incorrect adjusted hydraulic spool valve - Replace or adjust correctly
Hydraulic cylinder malfunction - Inspect cylinder components for damage or wear and change if required

Steering System Troubleshooting
Steering wheel is very heavy to turn
Damaged or improperly installed steering column - Reinstall or replace the steering column
Air trapped in the steering system - Bleed air
Not adjusted toe-in - Adjust toe-in correctly
Deflated front tyres - Inflate tyres as needed
Steering pump failure - Steering pump needs to be replaced or repaired
Steering valve is worn or defective - Inspect and change as required
Relief valve is stuck or worn - Clean or change the relief valve
Insufficient steering oil - Need to add steering oil
Oil leakage in the steering system - Retighten steering hose and pipe connections
Excessive steering wheel free play
Steering column shaft or coupling is worn out - Replace faulty component
Faulty or worn steering valve - Repair or change the steering valve
Steering pump is worn - Repair or replace steering pump
Steering linkage or tie-rod ends are worn - Replace failed part
Front wheels wander to right or left
Tire pressure is improper - Inflate the tires properly
Improper toe-in - Check and adjust toe-in
Faulty or worn steering tie-rod ends or linkage - Replace damaged part
Defective or worn steering valve - Change or repair steering valve if required
Steering valve cylinder is worn - Repair or change steering valve cylinder
Worn or incorrectly adjusted or worn front hub bearings - Replace the bearings or adjust it properly

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