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John Deere 4440 Troubleshooting

The John Deere 4440 is an Iron horses series row crop tractor. This model was manufactured from 1978 to 1982. The components of JD 4440 powerline system: John Deere 6466T 4-stroke six-cylinder direct injection turbocharged diesel engine, and 16x6 Quad range partial powershift transmission or full powershift transmission with 8 forward and 4 reverse gears.

A 466 cu.in (7.6 L) engine output is 154 hp (115.1 kw), and maximum torque is 642 Nm (475 lb-ft) at 1500 rpm. The maximum forward speed - 18.6 mph (29.9 kph), max. reverse speed - 10.7 mph (17.2 kph).

The closed center hydraulic system includes a piston pump with a rated capacity of 23 gal/min (87.2 l/min). The hydraulic system pressure is 155 bar (2250 psi). The 2WD models are equipped with 11.0x16 front tires and 18.4x34 rear tires. The 14Lx16.1 front tires and 23.1x34 rear tires are used for 4WD tractors. The wheel base is 106.7" (2710 mm). Compatible attachments for the John Deere 4440 tractor: a 148 front end loader with a lift capacity to full height of 3100 lbs (1406 kg), or 158 front end loader with a lift capacity to full height of 3800 lbs (1723 kg).

Engine Troubleshooting
Engine will not start or difficult to start
Dirty fuel filter element - Install new filter element
Closed fuel cock - Open fuel on-off cock to inject fuel
Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system
Dirty or damaged injectors - Service or change fuel injectors
Fuel injection pump is broken - Rebuild or install a new injection pump
Low cylinder compression - Check cylinder block and replace defective parts
Engine shuts off unexpectedly during operation
Coolant temperature is low - Warm up the engine
Air in fuel lines - Bleed fuel lines
Uneven fuel injections - Repair or adjustment
Fuel filter is dirty - Clean the filter element
Dirty or damaged injectors - Change fuel injectors
Engine stops after starting
Incorrectly set fuel injection pump timing - Check the fuel injection pump timing setting
Fuel filter plugging - Change filter element
Fuel injector nozzles fault - Replace fuel injector nozzles
Defective fuel injection pump - Replace or rebuild injection pump
Clogged air cleaner element - Service or change air cleaner
Engine stalls at low idle speed
Low idle speed setting is incorrect - Adjust low idle speed
Fuel injection pump is damaged - Install a new pump or rebuild
Fuel injector nozzles are damaged - Replace fuel injector nozzles
Valve out of adjustment - Adjust valve clearance according to specifications
Engine overheated
Engine has a lack of coolant - Refill to the correct level. Check system for leaks
Cooling system components are defective or system is dirty - Replace faulty parts or flush the cooling system
Engine oil level is insufficient - Checking oil level and add if necessary
Worn fan belt or improper belt tension - Adjust belt tension correctly or replace it
Thermostat malfunction - Install new thermostat
Engine power is insufficient
Fuel injectors are defective or dirty - Test fuel injectors and change if necessary
Fuel injection pressure is incorrect - Test fuel injection pressure and adjust it correctly
Air filter clogging - Change or replace air filter element
Oil filter is clogged - Replace or service engine oil filter
Engine is running overloaded - Reduce the load or use a lower gear
Improper valve clearance - Need to adjust valve clearance
Too low idle RPM - Adjust low idle speed
Dirt in the hoses or pipes - Service fuel hoses and pipes
Lack of compression: Intake or exhaust valves are damaged - Valve replacement required
Engine knocking or noise
Incorrectly set fuel injection pump timing - Repair or replace fuel injection pump
Fuel injector nozzles are clogged or faulty - Inspect injector nozzles and change if required
Not enough engine oil - Check oil level and add oil as required
Low coolant temperature - Normalize the temperature by warming up the engine
Main bearings or crankshaft wear - Install new parts
Piston rings are defective or broken - Replace piston rings
Loose flywheel screws - Inspect the flywheel screws and tighten securely
High engine oil consumption
Oil leakage: Gaskets or seals may be damaged - Install new components
Oil viscosity is incorrect - Use oil of proper viscosity
Seized or wear piston rings - Change the piston rings as required
Valve stems and guides are worn - Valves replacement required
Scuffed cylinder liners or pistons - Check pistons and liners, change as required

Electrical System Troubleshooting
Battery will not charge
Defective battery - Battery change required
Damaged battery wiring harness - Inspect wiring for damage, replace or repair
Corroded or loose battery cables and terminals - Service or tighten battery terminals and cables
Damaged belt or incorrectly adjusted belt tension - Adjust belt tension as required or change belt
Starter cranks slow
Low battery output - Battery is drained, charge it
Battery is not holding charge - Service charging system or replace battery
Battery wiring harness failure - Inspect electrical cables for defects, repair or replace
Battery cables and terminals are corroded or loose - Service or tighten battery cables and terminals
Starter motor is not working
Battery capacity is low - Battery is drained, recharge it
Drained or defective battery - Change or recharge battery
Starter motor failure - Repair or install a new starter
Battery cables are disconnected or incorrectly connected - Check cables and reconnect it correctly

Transmission Troubleshooting
Difficulty shifting gears
Incorrectly adjusted or damaged clutch - Adjust or install new clutch
Stuck or damaged gear shift linkage - Repair or change shift linkage
Shift forks are worn or damaged - Replace the shift forks
Faulty gear shifting mechanism - Faulty parts must be changed
Insufficient transmission oil pressure
Lack of transmission fluid supply - Fill the transmission housing with fluid
Clogged transmission oil filter (if equipped) - Change or clean the transmission oil filter
Relief valve failure - Change relief valve
Excessive transmission noise
Bearings are worn or broken - Bearings need to be replaced
Insufficient oil supply - Fill up the transmission oil
Contaminated transmission oil - Transmission oil must be changed
Backlash is incorrect or gears are worn - Set backlash properly or change the gears
Shift forks are damaged or worn - Replace the shift forks
Transmission oil leaks
Worn gaskets or seals - Install new components
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system is overheated
System pressure has not been adjusted correctly - Pressure needs to be adjust correctly
Main relief valve malfunction or incorrect adjustment - Set up or change the relief valve
Contaminated hydraulic oil - Change hydraulic oil
Air in hydraulic system - Check the suction pipe, fittings, and pump seals
Hydraulic oil pressure is low
Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid
Hydraulic oil filter clogging - Install a new hydraulic filter element
Hydraulic pump malfunction - Flow-rate hydraulic pump and replace pump if necessary
Hydraulic spool valve is not set properly or defective - Replace or set correctly
Hydraulic cylinder malfunction - Check cylinder parts for wear or damage 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
Not enough hydraulic oil in the system - Add oil to the hydraulic system
Cold oil in hydraulic system - Wait for oil to warm up
Dirty hydraulic oil filter - Change hydraulic filter element or clean if necessary
Hydraulic pump not working - Check pump flow and install new pump if necessary
Faulty or incorrectly adjusted main relief valve - Adjust relief valve or change if required
Faulty or incorrect setting hydraulic spool valve - Adjust properly or replace
Defective hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary
Broken or disconnected suction line - Connect or replace
Hitch drops too slowly or can't drop
Defective or not adjusted hydraulic spool valve - Set correctly or replace
Hydraulic cylinder is faulty - Inspect cylinder parts for wear or damage and replace if required
Hitch rock shaft is damaged - Install a new shaft
The hitch has any internal mechanical damage - Change faulty or worn hitch components
3-point hitch lift or lower is jerky
Air enters in hydraulic system - Check the suction pipe, fittings, and pump seals
Hydraulic fluid is dirty - Hydraulic fluid change required
Hydraulic pump is faulty - Test the pump flow rate and install new pump if required
Damaged or incorrect adjusted hydraulic spool valve - Adjust properly or change
Defective hydraulic cylinder - Inspect cylinder components for wear or damage and change if required

Steering System Troubleshooting
Steering wheel is hard to turn
Defective or improperly assembled steering column - Reassemble properly or change steering column
Air in steering system - Bleed air
Improper toe-in - Adjust toe-in properly
Deflated front tyres - Inflate tyres as needed
Damaged hydraulic steering pump - Repair or replace steering pump
Defective or worn steering valve assembly - Repair or replace the steering valve
Stuck or defective relief valve - Check relief valve and change if required
Low steering fluid level - Fill the steering system with fluid
Steering system oil leak - Tighten connections of hydraulic hoses and pipes in steering system
Excessive steering wheel play
Steering column shaft or coupling is worn out - Replace faulty component
Steering valve assembly is defective or worn - Repair or replace the steering valve
Steering pump is faulty - Steering pump needs to be repaired or replaced
Steering tie-rod ends or linkage are defective - Replace failed part
Tractor pulls to left or right
Tires are improperly inflated - Inflate as necessary
Not adjusted toe-in - Adjust toe-in wheels properly
Steering linkage or tie-rod ends are defective - Replace failed component
Faulty or worn steering valve assembly - Check and replace as required
Defective or improperly adjusted front hub bearings - Change or adjust the bearings properly




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