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John Deere 4755 Troubleshooting

The John Deere 4755 is a 2WD or 4WD row-crop tractor from 4055 series. This model was manufactured between 1989 and 1991. The JD 4755 tractor is powered by John Deere 6466 six-cylinder direct injection turbocharged intercooled diesel engine with operating power of 190 Hp (141.5 kW) and 820 Nm (607 lb-ft) of peak torque at 1210 rpm.

The JD 4755 is fitted with two types of transmission. Type 1: 16x6 Quad Range partial powershift transmission. Type 2: Power Shift transmission with 15 forward and 4 reverse gears.

Max. forward speed - 19.6 mph (31.5 kph), max. reverse speed - 12.6 mph (20.3 kph). The closed center hydraulic system used a piston pump with a flow of 29.5 gal/min (111.5 l/min). The hydraulic pressure is 174.5 bar (2530 psi). The John Deere 4755 is equipped with 11.00x16 front tyres and 20.8x38 rear tyres. The wheel base is 118.5" (3000 mm) for 2-wheel drive models and 117.1" (2970 mm) for 4-wheel drive models.

Compatible attachments for the tractor: John Deere 280 loader with a lift capacity to max height of 4580 lbs (2077 kg), and John Deere 840 loader with a lift capacity to max height of 4972 lbs (2260 kg).

Engine Troubleshooting
Engine is not starting or hard starting
Dirty fuel filter element - Change filter element
No fuel injection - Open fuel cock to inject fuel
Fuel-line is leaking air - Retighten clamps, replace defective pipes
Faulty or dirty injectors - Change fuel injectors
Faulty fuel injection pump - Repair or replace injection pump
Low compression - Check cylinder block and replace damaged components
Engine shuts off unexpectedly while running
Engine is not fully warmed up - Warm up to required temperature
Air in fuel lines - Bleed fuel lines
Irregular fuel injection - Adjust fuel injection timing
Fuel filter plugging - Change filter element
Dirty or damaged injectors - Test fuel injectors and change if necessary
Engine starts but immediately shuts off
Unadjusted fuel injection pump timing - Fuel pump timing settings need to be corrected
Fuel filter clogging - Install new filter element
Fuel injector nozzles are defective or dirty - Change injector nozzles
Fuel injection pump is not working correctly - Change pump or rebuild it
Dirty air cleaner element - Change or replace air cleaner element
Engine stalling at idle
Incorrectly adjusted low idle speed - Correct low idle adjustment
Fuel injection pump is not operating properly - Replace or repair injection pump
Fuel injector nozzles are clogged or faulty - Test injector nozzles and replace as required
Valve clearance is not correct - Adjust to proper valve clearance
Engine overheated
Low coolant level - Top up coolant. Check and repair damage to the cooling system if required
Cooling system parts are defective or system is dirty - Flush cooling system or replace faulty parts
Not enough engine oil - Fill up the oil to required level
Fan belt tension is not adjusted or belt is worn - Adjust properly or replace the belt
Thermostat is defective - Check thermostat, replace if necessary
Diesel engine is losing power
Clogged or damaged injectors - Change fuel injectors
Incorrect fuel injection pressure - Repair or replace injection pump
Dirty air filter - Replace or clean the air filter element
Oil filter element clogged - Service or change engine oil filter element
Engine is running overloaded - Reduce the load or use a lower gear
Improper valve clearance - Correct valve clearance
Wrong adjustment of low idle speed - Correct low idle adjustment
Dirty fuel hoses or pipes - Clean fuel pipes and hoses
Poor engine compression: Inlet or outlet valves are defective - Install new valves
Engine knocking or noise
Unadjusted fuel injection pump timing - Adjust the fuel injection pump timing correctly
Fuel injector nozzles are defective or dirty - Service or replace injector nozzles
Engine oil level low - Check and refill engine oil
Engine not warmed up - Engine is not warmed up to the required temperature
Main bearings or crankshaft failure - Worn parts replacement required
Stuck or worn piston rings - Have piston rings replaced
The flywheel to crankshaft bolts are loose - Tighten bolts as required
Engine oil consumption is too high
External oil leaks: Seals or gaskets are wearing excessively - Replace to repair leaks
Incorrect oil viscosity - Use oil of correct viscosity
Piston rings are stuck or worn - Install new piston rings
Damaged valve stems or valve guides - Valves need to be changed
Scuffed cylinder liners or pistons - Check liners and pistons, replace as required

Electrical System Troubleshooting
Battery does not charge
Defective battery - Use a new battery
Bad battery cable harness - Inspect cables for malfunctions, repair or change
Corroded or loose cables and terminals - Tighten or clean cables and terminals
Incorrect belt tension adjustment or worn belt - Adjust belt tension as required or change belt
Starter cranks slow
Low battery output voltage - Battery is drained, charge it
Battery is draining quickly - Service battery or replace it
Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair
Loose or corroded terminals and cables - Tighten or clean cables and terminals
Starter does not work
Battery capacity is low - Charge the battery
Discharged or faulty battery - Replace or charge as required
Defective starter motor - Repair or replace starter
Incorrectly connected or disconnected wires - Check battery wires and connect correctly

Transmission Troubleshooting
Difficult to shift gears
Worn or incorrectly adjusted clutch - Adjust or change the clutch
Stuck or damaged gear shift linkage - Change defective shift linkage
Bent or worn shift forks - Change the shift forks
Worn gear shift mechanism - Replace worn components
Insufficient transmission fluid pressure
Not enough fluid in transmission - Check transmission fluid level and add it as required
Clogged transmission fluid filter element (if fitted) - Replace or clean transmission fluid filter
Relief valve failure - Replace the valve
Transmission makes noise
Cracked or worn bearings - Faulty bearings should be replaced
Not enough oil in transmission - Add transmission oil as required
Transmission fluid contamination - Change transmission fluid
Gears are worn or backlash is improper - Set backlash correctly or change the gears
Shift forks are damaged or worn - Install new shift forks
Transmission fluid leaking
Gaskets or seals are damaged - Replace worn seal or gaskets
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
Unadjusted or defective main relief valve - Replace or set up the relief valve
Hydraulic fluid is contaminated - Fill up with new hydraulic fluid
Hydraulic system sucks air - Check the suction line, pump seals, and fittings
Hydraulic oil pressure is low
Hydraulic oil level is low - Fill the hydraulic system with oil
Hydraulic oil filter element is dirty - Clean the hydraulic filter or install new filter element
Hydraulic pump malfunction - Test pump flow rate and replace pump if required
Hydraulic spool valve is faulty or out of adjustment - Adjust properly or replace
Hydraulic cylinder is broken - Check cylinder components for damage or wear and change if necessary
Hydraulic piping leaks - Find leaks in hydraulic system and repair it
3-point hitch won't raise or raises slowly
Not enough hydraulic oil in the system - Fill the hydraulic system with oil
Cold hydraulic oil - Warm up the oil
Hydraulic oil filter clogging - Replace filter element or clean if required
Hydraulic pump not working - Check pump performance and change it if necessary
Unadjusted or defective main relief valve - Adjust or change relief valve
Defective or not adjusted hydraulic control valve - Set correctly or replace
Broken hydraulic cylinder - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Damaged or loose hydraulic suction line - Tighten or change it
Hitch won't lower or lowers slowly
Hydraulic control valve block is faulty or out of adjustment - Set correctly or replace
Hydraulic cylinder malfunction - Check the hydraulic cylinder parts for damage or wear and replace if necessary
Hitch cross shaft is damaged - Change the shaft
Defective mechanical parts of the hitch - Replace faulty or worn hitch components
Hitch raises or lowers not smoothly
Air leaks in hydraulic system - Inspect the pump seals, suction pipe, and fittings
Hydraulic fluid is contaminated - Fill up with new hydraulic fluid
Hydraulic pump not working - Check the pump capacity and replace pump if required
Hydraulic control valve is defective or set improper - Set correctly or replace
Faulty hydraulic cylinder - Check cylinder parts for wear or damage and replace if necessary

Steering System Troubleshooting
Excessive effort to steer
Steering column is defective or incorrectly installed - Steering column must be installed correctly or replaced
Air leaks in steering system - Air-bleed steering system
Improper toe-in adjustment - Adjust toe-in wheels properly
Front tires are worn out - Install new tires
Faulty steering pump - Replace or repair steering pump
Damaged or worn steering valve assembly - Change or repair steering valve if required
Relief valve seizing or malfunction - Replace or install new relief valve
Not enough steering oil - Check oil level and add steering oil as required
Steering system has oil leaks - Tighten joints of hydraulic pipes and hoses in steering system
Excessive steering wheel play
Steering column coupling or shaft is worn - Replace defective part
Steering valve assembly has wear or damage - Repair or change the steering valve
Hydraulic steering pump is defective - Install a new steering pump
Faulty or worn steering linkage or tie-rod ends - Replace damaged component
Front wheels wander to left or right
Tires are not correctly inflated - Inflate tires as necessary
Not adjusted toe-in - Adjust toe-in wheels properly
Worn or faulty steering tie-rod ends or linkage - Change failed component
Steering valve assembly has wear or damage - Change or repair steering valve if required
Front hub bearings are worn or incorrectly adjusted - Adjust properly or change bearings




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