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John Deere 4240S Troubleshooting

John Deere 4240S is 4WD (4x4) farm tractor. This model manufactured from 1981 to 1984. The John Deere 4240S driveline includes a 4-stroke 6-cylinder turbo diesel engine and 16-speed Quad Range transmission, or 12-speed Synchro Range transmission.

A 7.6 L engine power is 132 Hp and a maximum torque is 560 Nm (413 lb-ft) at 1400 rpm. The maximum forward speed - 18.8 mph (30.3 kph), max. reverse speed - 10.5 mph (16.9 kph).

The closed center hydraulic system used a piston pump with fluid flow rate of 25.4 gpm. The hydraulic system pressure is 2250 psi. The John Deere 4240S tractor equpped with 6.5x14 front tire and 18.0-30 rear tire. The wheelbase is 104" (2640 mm), and operating weight is 11600 lbs (5260 kg).

Engine Troubleshooting
Engine will not start or hard to start
Fuel filter plugging - Change filter element
No fuel supply from the tank - Open the fuel supply valve
Fuel lines leaking air - Tighten clamps, change faulty pipes
Clogged or damaged injectors - Change fuel injectors
Faulty fuel injection pump - Replacement or repair required
Engine has low compression - Check cylinder block and change worn components
Engine stalls during operation
Engine has not warmed up to the required temperature - Normalize the temperature by warming up the engine
Air in fuel pipes - Bleed fuel pipes
Fuel injection failed - Use correct settings
Fuel filter is clogged - Replace filter element
Fuel injectors are defective or dirty - Inspect fuel injectors and replace if necessary
Diesel starts but suddenly stops
Incorrect setting of fuel injection pump timing - Adjust injection timing
Fuel filter is dirty - Filter maintenance required
Fuel injector nozzles are faulty - Test injector nozzles and replace as required
Damaged fuel injection pump - Rebuild or replace pump
Air cleaner is dirty - Service or replace the air cleaner
Engine stalls at idle
Incorrect low idle setting - Adjust as required
Faulty fuel injection pump - Rebuild or change fuel pump
Fuel injector nozzles are defective or dirty - Install new set of properly balanced nozzles
Incorrect valve clearance - Correct valve clearance
Engine overheats
Low coolant level - Fill the radiator to the required level. Repair any leaks if necessary
Cooling system parts are failed or system is dirty - Change faulty components or flush the cooling system
Engine oil level low - Need to add engine oil
Fan belt is damaged or belt tension is incorrect - Adjust properly or replace the belt
Thermostat is defective - Check and change if necessary
Engine power loss
Dirty or damaged injectors - Change fuel injectors
Fuel injection pressure is wrong - Correct the pressure settings
Dirty air filter - Air filter maintenance required
Dirty oil filter element - Service or change engine oil filter element
Engine overload - Reduce the load or use a lower gear
Incorrect valve clearance - Adjust valve clearance
Wrong adjustment of low idle speed - Correct low idle settings
Fuel hoses or pipes are clogged - Clean fuel system hoses and pipes
Engine low compression: Leaking or broken valves - Replace the valves
Abnormal engine noise or knocking
Timing of fuel injection pump is wrong - Correct injection timing
Faulty fuel injector nozzles - Install a new set of well-balanced nozzles
Engine oil insufficient - Add oil to the engine crankcase
Engine is not warmed up to the required temperature - Warm up the engine
Crankshaft or main bearings failure - Repair or replace defective parts
Worn or broken piston rings - Have piston rings replaced
Flywheel screws are loose - Tighten the screws firmly
Diesel engine using too much oil
Oil leaking: Defective seals or gaskets - Change worn parts according to specifications
Improper oil viscosity - Fill up with the correct oil viscosity
Stuck or worn piston rings - Piston rings need to be replaced
Valve stems or guides are damaged - Change the valves
Pistons or cylinder liners are scuffed - Inspect liners and pistons, replace as necessary

Electrical System Troubleshooting
Battery does not charge
Bad cell in battery - Replace the battery
Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair
Corroded or loose battery cables and terminals - Clean or tighten cables and terminals
Worn belt or improperly adjusted belt tension - Install new belt or adjust belt tension as required
Starter motor turns slow
Battery power is low - Charge the battery
Battery runs out quickly - Service or replace the battery
Bad battery electrical wire harness - Check wires for malfunctions, repair or replace
Battery cables and terminals are loose or corroded - Cables and terminals must be tightened or cleaned
Starter does not work
Low battery capacity - Charge the battery
Discharged or worn battery - Battery needs to be recharged or replaced
Defective starter motor - Change or repair starter
Wiring harness is disconnected or improperly connected - Check wiring harness and reconnect properly

Transmission Troubleshooting
Gear shift is hard
Clutch is not adjusted or faulty - Clutch needs to be replaced or adjusted
Gear shift linkage is stuck or worn - Change or repair shift linkage
Damaged or worn shift forks - Change the shift forks
Faulty parts in the gear shifting mechanism - Change faulty parts
Low transmission pressure
Insufficient fluid supply - Check and refill the transmission fluid
Transmission oil filter element is clogged (if equipped) - Change or service the transmission oil filter
Relief valve is defective - Change the valve
Transmission is excessively noisy
Cracked or worn bearings - Faulty bearings should be changed
Oil level is insufficient - Fill up the transmission oil
Dirty transmission fluid - Change transmission fluid
Gears are worn or backlash is improper - Set backlash correctly or change the gears
Worn or damaged shift forks - Shift forks need to be changed
Transmission oil leaking
Gaskets or seals are damaged - Install new components
Transmission housing is cracked - Replace housing or transmission assembly

Hydraulics Troubleshooting
Hydraulic system is overheated
Hydraulic system pressure is incorrect - Hydraulic pressure needs to be set correctly
Main relief valve failure or incorrect setting - Replace or set up the relief valve
Hydraulic oil is dirty - Hydraulic oil change required
Air leaks in hydraulic system - Inspect the suction pipe, fittings, and pump seals
Low hydraulic system pressure
Hydraulic fluid level is low - Fill the hydraulic system with oil
Hydraulic fluid filter clogging - Clean the hydraulic filter element or replace if necessary
Hydraulic pump failure - Check the pump performance and replace it if required
Hydraulic spool valve block is not set properly or defective - Replace or adjust correctly
Hydraulic cylinder malfunction - Inspect cylinder components for damage or wear and change if required
Leakage in hydraulic lines - Detect leaks in hydraulic system and repair it
3-point hitch raises slowly or won't raise
Hydraulic oil level is insufficient - Fill up the hydraulic oil
Cold oil in hydraulic system - Wait for oil to warm up
Hydraulic fluid filter element clogging - Install a new hydraulic filter element
Faulty hydraulic oil pump - Test the pump flow rate and install new pump if required
Main relief valve malfunction or incorrect adjustment - Set up or change the relief valve
Hydraulic control valve is faulty or out of adjustment - Set properly or replace
Faulty hydraulic cylinder - Inspect the hydraulic cylinder components for damage or wear and change if required
Suction line is damaged or disconnected - Connect or replace
Hitch can't drop or drops too slowly
Defective or incorrect setting hydraulic spool valve block - Replace or set properly
Hydraulic cylinder is faulty - Inspect cylinder components for wear or damage and change if required
Lift arm shaft is worn - Change the shaft
The hitch has internal mechanical malfunctions - Change worn or damaged hitch components
3-point hitch lifting or lowering is jerky
Air leaks in hydraulic system - Inspect the pump seals, suction line, and fittings
Hydraulic oil contamination - Change the oil
Defective hydraulic pump - Test pump flow rate and replace pump if required
Hydraulic spool valve block is not set properly or defective - Replace or set correctly
Hydraulic cylinder failure - Check the hydraulic cylinder parts for damage or wear and replace if necessary

Steering System Troubleshooting
Steering wheel is hard to turn
Defective or incorrectly installed steering column - Reinstall the steering column or change it
Aeration in steering system - Need to bleed air
Improper toe-in - Adjust toe-in correctly
Improper tire pressure - Check the pressure and inflate tires as required
Defective hydraulic steering pump - Check the hydraulic steering pump and change if necessary
Worn or damaged hydrostatic steering unit - Repair or change the steering unit
Steering oil level low - Add oil to steering system
Oil leakage in the steering system - Tighten the steering pipe and hose joints
Excessive steering wheel free play
Steering column shaft or coupling has maximum wear - Replace defective component
Worn or defective hydrostatic steering unit - Change or repair steering unit if required
Steering pump failure - Steering pump needs to be repaired or replaced
Worn or faulty steering tie-rod ends or linkage - Change failed component
Front wheels wander to right or left
Low tire pressure - Inflate the tires
Not adjusted toe-in - Check toe-in and correct
Faulty or worn steering linkage or tie-rod ends - Change failed component
Worn or damaged hydrostatic steering unit - Inspect and replace as required
Steering cylinder failure - Repair or change steering cylinder
Front hub bearings are improperly adjusted or defective - Adjust correctly or change bearings




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