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