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John Deere 4240S Troubleshooting

Diesel Engine Troubleshooting

Diesel engine hard to start or doesn't start: Fuel filter plugging. Clean the filter element. Air in the fuel system. Air bleeding. Fuel injection nozzles are damaged or dirty. Install a new kit of correctly balanced nozzles. Faulty fuel injection pump. Replacement or repair required.

Engine shuts off suddenly while running: Improper setting of fuel injection pump timing. Adjust fuel injection pump as required. Fuel filter element clogging. Service or replace the filter. Coolant temperature is low. Normalize the temperature by warming up the engine.

Diesel starts and stops: Fuel filter element clogging. Change filter element. Fuel injection pump is faulty. Install a new pump or rebuild. Dirty air filter element. Clean or replace the element.

Engine is overheated: Radiator fins are clogged or radiator cap is faulty. Replace cap or clean radiator. Insufficient coolant. Top up coolant fluid and check system for leaks. Fan belt is worn or faulty. Replace as required. Engine oil insufficient. Fill up the oil to required level.

Engine power is too low: Dirty or faulty injection nozzles. Inspect nozzles and replace if necessary. Dirty fuel lines or hoses. Clean fuel hoses and lines. Air filter element clogged. Service air cleaner. Cylinder head gasket defective. Gasket should be replaced.

Engine knocking or noise: Engine is not warmed up to the required temperature. Engine is not warmed up to the required temperature. Not enough engine oil. Fill up the oil to required level. Fuel injection pump timing is not adjusted. Set up as recommended. Piston wear or scoring. Replace the pistons. Connecting rod misalignment or failure. Need to change or align the connecting rod.

Engine stops while idle: Low idle speed setting is incorrect. Normalize low idle speed. Valve clearance is not correct. Have it adjusted. Fuel injection pump is not operating properly. Rebuild or change fuel pump.

Insufficient oil pressure: Oil level is low. Fill the crankcase with oil. Defective oil pump. Check and replace if necessary. Oil filter clogging. Clean or replace engine oil filter element.

John Deere 4240S Transmission Troubleshooting

Transmission noise: Incorrect backlash or gears are worn. Change the gears or set backlash properly. Shift forks are bent or worn out. Change defective shift forks. Shaft splines are worn or damaged. Shaft need to be changed. Transmission fluid level is low. Checking transmission fluid level and add if necessary. Bearings are damaged or worn. Bearings replacement required. Transmission oil contamination. Fill up with fresh transmission oil.

Hard shifting: Gear shift linkage is worn or rusty. Install a new gear shift linkage. Clutch is out of adjustment or defective. Adjust or replace the clutch. Worn or bent gear shift forks. Install new shift forks. Worn parts of the gear shifting mechanism. Change worn parts.

Insufficient transmission fluid pressure: Transmission oil level is low. Check transmission oil level and add oil as required. Dirty transmission oil filter element (if equipped). Clean or change transmission oil filter. Relief valve failure. Replace relief valve.

External fluid leaks: Damaged seals or gaskets. Seals and gaskets replacement required. Too much oil in transmission. Drain the excess oil.

John Deere 4240S Hydraulic System Troubleshooting

Hydraulic system overheating: Incorrect hydraulic oil type. Use the correct type of hydraulic oil. Hydraulic oil contamination. Change the oil. Air in the hydraulic system. Air bleeding. Main relief valve is defective. Replace relief valve.

Insufficient hydraulic oil pressure: Low hydraulic oil level. Need to add oil. Dirty hydraulic fluid filter. Install a new hydraulic filter element. Leaking hydraulic lines. Identify leaks in the system and repair it. Hydraulic spool valve block is not adjusted properly. The spool valve should be properly adjusted. Hydraulic pump not working. Install a new hydraulic oil pump. Damaged hydraulic cylinder. Repair or change hydraulic cylinder.

Hitch not lifting or hitch lifts slowly: Hydraulic pump failure. Replace or repair hydraulic fluid pump. Damaged main relief valve. Relief valve replacement required. Faulty hydraulic control valve. Change or repair hydraulic valve. Hydraulic cylinder failure. Repair or change hydraulic cylinder. Insufficient hydraulic fluid. Fill the system to proper hydraulic fluid level. Hydraulic oil filter element is clogged. Service the hydraulic filter or change if required. Hitch is under excessive load. Reduce hitch load.

Hitch cannot be dropped or dropping is too slow: Hydraulic cylinder is broken. Repair or change hydraulic cylinder. Hydraulic spool valve block is not adjusted properly. The spool valve should be properly adjusted. Worn lift arm shaft. Change the shaft. The three-point hitch is not adjusted. Adjustment is required.

Hitch lowering or lifting is jerky: Hydraulic fluid contamination. Change hydraulic fluid. Hydraulic pump is faulty. Install a new hydraulic oil pump. Air in hydraulic system. Bleed air from hydraulic system. Defective hydraulic spool valve. Install a new valve or repair it. Hydraulic cylinder failure. Change or repair hydraulic cylinder.

John Deere 4240S Steering Troubleshooting

Steering wheel has too much free-play: Steering column coupling or shaft is worn. Replace faulty component. Steering pump stopped working. Steering pump needs to be repaired or replaced. Worn or loose steering linkage joints. Repair or change steering linkage. Hydrostatic steering unit is damaged or worn. Repair or change the steering unit.

Steering is stiff: Air trapped inside steering system. Bleed air from system. Steering filter clogging. Change steering filter element. Insufficient steering oil. Need to add steering oil. Hydrostatic steering unit is damaged or worn. Repair or change the steering unit. Faulty steering pump. Replace or repair steering pump. Pump flow control valve is worn or stuck. Replace or service control valve. Incorrectly installed or worn steering column. Install the steering column correctly or replace it. Uneven tire pressure. Inflate the tires properly. Incorrect toe-in. Adjust toe-in wheels. Steering cylinder leaks. Change worn piston rod or damaged cylinder seals.

Tractor is pulling to left or right: Hydrostatic steering unit has wear or damage. Repair or change the steering unit. Faulty steering cylinder. Change or repair hydraulic steering cylinder. Not adjusted toe-in. Adjust toe-in properly. Loose or worn steering linkage components. Check and replace as required. Defective or improperly adjusted front wheel bearings. Adjust correctly or change bearings. Tire pressure uneven. Inflate the tires correctly.

John Deere 4240S Electrical System Troubleshooting

Battery does not charge: Wiring connections are corroded or loose. Service or tighten cable connections. Electrical terminal connectors are faulty. Change terminal connectors. Battery dead cell. Change the battery. Belt is damaged or loose. Belt needs to be adjusted or changed.

Starter turns slowly: Low battery output voltage. Battery is drained, recharge it. Battery does not hold charge. Service or change the battery. Battery terminals are corroded or wires are disconnected. Connect wiring correctly or install new terminals.

Starter will not crank: Battery is discharged or defective. Replace or charge as required. Disconnected or incorrectly connected wires. Inspect battery wires and connect correctly. Battery power is low. Battery needs to be recharged. Starter motor is faulty. Repair or change starter.

JOHN DEERE TRACTORS ATTACHMENTS
1023E	2025R	2210	2520	3032E
3046R	3520	4066R	4105	4200
4320	4400	4520	4600	4720
430	420	455	X300	X350
X485	X500	X590	X700	X738

JOHN DEERE TRACTORS TROUBLESHOOTING
2640	3040	3310	3650	4100
5050D	5090R	5410	6105R	7200R
E130	L111	LA110	LT155	X300R