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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 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 |
| 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 |
| 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 |
| 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 |
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| Farm Tractors Technical Specifications |
