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John Deere 1250 Troubleshooting

John Deere 1250 Engine Troubleshooting

Engine starts hard or will not start: Fuel filter plugged. Clean the filter or install new filter element. Air in fuel tank. Bleed fuel tank. Clogged or defective injection nozzles. Clean or change injection nozzles. Fuel injection pump damage. Rebuild or change fuel pump.

Engine shuts off suddenly during operation: Fuel injection pump timing is wrong. Set the fuel pump timing correctly. Fuel filter element is dirty. Service the filter. Coolant temperature is low. Warm up the engine.

Engine starts but stalls immediately: Clogged fuel filter. Change filter element. Fuel injection pump is broken. Replace injection pump or repair it. Plugged air filter. Clean or replace element.

Engine is overheated: Defective radiator cap or clogged radiator fins. Clean radiator or install new cap. Low coolant level. Add coolant and check the components of cooling system. Fan belt slipping or worn. Fan belt must be replaced. Engine oil level low. Checking oil level and add if necessary.

Low engine power: Fuel injection nozzles are damaged or dirty. Test injection nozzles and change if necessary. Fuel hoses or lines are dirty. Clean fuel system lines and hoses. Dirty air cleaner. Replace air filter element. Cylinder head gasket defective. Install a new gasket.

Engine knocks or noises: Coolant temperature is low. Warm up to required temperature. Lack of engine oil. Fill up the engine oil. Fuel injection pump timing is not adjusted. Set the fuel pump timing correctly. Pistons are worn or broken. Have pistons replaced. Faulty or misaligned connecting rod. Connecting rod must be aligned or replaced.

Engine stops at idle: Low idle speed setting is not correct. Adjust the low idle speed. The valve clearance is not adjusted. Correct valve clearance. Fuel injection pump malfunction. Rebuild or install a new injection pump.

Insufficient oil pressure: Oil level is low. Checking oil level and add if necessary. Oil pump is damaged. Install a new pump. Dirty oil filter element. Change or clean engine oil filter element.

John Deere 1250 Transmission Troubleshooting

Transmission is excessively noisy: Worn gears or incorrect backlash. Install new gears and adjust backlash properly. Worn or damaged gear shift forks. Shift forks need to be replaced. Stuck or worn shaft splines. Change defective shaft. Lack of transmission fluid. Add fluid to the transmission housing. Worn or damaged bearings. Faulty bearings should be changed. Transmission fluid contamination. Fill up with fresh transmission fluid.

Gears are hard to shift: Rusty or worn gear shift linkage. Replace or lubricate the shift linkage. Clutch is worn or not adjusted. Clutch adjustment or replacement required. Damaged or worn gear shift forks. Change defective shift forks. Worn out parts of the gearshift mechanism. Replace worn parts.

Low transmission oil pressure: Lack of transmission fluid. Checking transmission fluid level and add if necessary. Dirty transmission fluid filter element (if equipped). Service or change transmission fluid filter. Stuck relief valve. Replace relief valve.

Transmission fluid leakage: Seals or gaskets are worn. Change defective seal or gaskets. Transmission oil level is exceeded. Correct the oil volume.

John Deere 1250 Hydraulics Troubleshooting

Hydraulic system overheating: Improper type of hydraulic fluid. The correct type of fluid must be used. Contaminated hydraulic oil. Change hydraulic oil. Air in hydraulic lines. Bleed hydraulic lines. Main relief valve failure. Replace relief valve.

Low hydraulic fluid pressure: Hydraulic fluid is insufficient. Fill up the hydraulic fluid. Dirty hydraulic oil filter element. Change the hydraulic filter element or service if required. Leaking hydraulic pipes. Find leaks in the system and fix it. Hydraulic control valve block is set improperly. Set properly. Damaged hydraulic pump. Install a new hydraulic oil pump. Defective hydraulic cylinder. Repair or replace hydraulic cylinder.

3-point hitch fails to lift or lifts slowly: Faulty hydraulic pump. Replace or repair hydraulic fluid pump. Damaged main relief valve. Change relief valve. Defective hydraulic spool valve block. Install a new hydraulic valve or repair it. Hydraulic cylinder failure. Repair or install a new hydraulic cylinder. Low hydraulic oil level. Check and refill the hydraulic oil. Dirty hydraulic oil filter element. Change hydraulic filter element or clean if necessary. Excessive load on hitch. The load should be reduced.

Hitch cannot be lowered or lowering is too slowly: Faulty hydraulic cylinder. Repair or change hydraulic cylinder. Incorrect setting hydraulic spool valve. Use the correct setting. Hitch rock shaft is damaged. Replace the shaft. The hitch has not been adjusted. Adjust three-point hitch as required.

Hitch lower or lift is jerky: Hydraulic oil is contaminated. Fill up with fresh hydraulic oil. Damaged hydraulic pump. Install a new hydraulic oil pump. Air in hydraulic lines. Bleed hydraulic lines. Faulty hydraulic spool valve. Change or repair hydraulic valve. Hydraulic cylinder failure. Install a new hydraulic cylinder or repair it.

John Deere 1250 Steering System Troubleshooting

Excessive free play of steering wheel: Steering column shaft or coupling is worn out. Change faulty part. Worn steering pump. Repair or replace steering pump. Loose or worn steering linkage parts. Inspect and replace as required. Power steering gear box parts are faulty. Replace defective parts of power steering box.

Steering is stiff: Air in steering system. Bleed air from system. Dirty steering filter. Clean or change steering filter. Low steering fluid level. Fill the steering system with fluid. Steering gearbox components are worn. Repair power steering box. Steering pump is faulty. Check the hydraulic steering pump and change if necessary. Stuck or faulty steering pump control valve. Service or replace flow control valve. Incorrectly assembled or damaged steering column. Reassemble the steering column correctly or change it. Front tires are worn unevenly. Install new tires. Incorrect toe-in. Adjust toe-in properly. Steering cylinder leaks. Replace worn cylinder seals or scratched piston rod.

Tractor pulls to right or left: Steering box parts are faulty. Replace defective components of power steering gearbox. Damaged steering cylinder. Replace or repair hydraulic steering cylinder. Improper toe-in. Adjust toe-in properly. Steering linkage parts are loose or worn. Inspect and replace as required. Improperly adjusted or defective front hub bearings. Adjust correctly or replace bearings. Uneven tyre pressure. Inflate the tyres properly.

John Deere 1250 Electrical Troubleshooting

Battery will not charge: Loose or corroded wire connections. Clean or tighten connections. Electrical terminal connectors are defective. Replace terminal connectors. Defective battery. Battery replacement required. Loose or worn belt. Need to adjust belt tension or replace belt.

Starter motor cranks slow: Low battery voltage. Low battery charging, charge as required. Battery will not hold charge. Service charging system or replace battery. Corroded battery terminals or disconnected wires. Check cables and clean or change terminals.

Starter is not working: Battery is low or faulty. Need to charge or replace the battery. Disconnected or improperly connected wiring harness. Inspect battery wiring harness and connect as required. Low battery output voltage. Charge the battery. Starter motor failing. Starter should be replaced.

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