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John Deere 955 Troubleshooting

John Deere 955 Diesel Engine Troubleshooting

Engine starts hard or will not start: Fuel filter plugged. Service or replace the filter. Air in the fuel pipes. Bleed the fuel pipes. Fuel injection nozzles are faulty or clogged. Clean or replace injection nozzles. Fuel injection pump is damaged. Replace injection pump or repair it.

Engine stalls during operation: Fuel injection pump timing is wrong. Set it up as required. Fuel filter plugging. Change the filter element. Coolant temperature is low. Warm up to required temperature.

Diesel starts and then shuts off: Dirty fuel filter. Replace filter element. Fuel injection pump damage. Change or repair the pump. Intake air restriction. Clean air cleaner element.

Engine overheated: Defective radiator cap or clogged radiator core. Install new cap or clean radiator. Not enough coolant. Add coolant fluid and inspect the cooling system for leaks. Loose or damaged fan belt. Change as required. Insufficient engine oil. Fill up the oil to required level.

Diesel engine loses power: Fuel injection nozzles are damaged or dirty. Service or change injection nozzles. Dirt in the fuel lines or hoses. Service fuel lines and hoses. Restricted intake air. Service air cleaner. Damaged cylinder-head gasket. Gasket should be replaced.

Engine knocking sound or abnormal noise: Engine is not fully warmed up. Warm up engine as required. Engine oil insufficient. Checking oil level and add if necessary. Wrong setting of fuel injection pump timing. Adjust the pump as required. Worn or scored pistons. Replace the pistons as required. Connecting rod is worn or not aligned. Align or replace connecting rod.

Engine stops at low idle speed: Low idle speed set incorrectly. Correct low idle adjustment. Incorrect valve clearance. Need to adjust valve clearance. Fuel injection pump malfunctioning. Install a new pump or rebuild.

Insufficient oil pressure: Engine oil level low. Need to add oil. Defective oil pump. Remove and inspect oil pump. Dirty oil filter. Change or service engine oil filter.

John Deere 955 Hydrostatic Transmission Troubleshooting

Excessive hydrostatic transmission noise: Speed control linkage is defective or unadjusted. Replace or adjust linkage. Excessive loading. Reduce loading. Dirty transmission fluid or insufficient fluid level. Fill to required level or change the fluid. Relief valve is damaged. Replace valve as required. Worn or defective parts of the hydrostatic transmission. After disassembling and inspection, change defective components.

Transmission fluid overheats: Excessive transmission load. Reduce loading. Cooling components are clogged or damaged. Inspect all cooling components and service or change if necessary. Insufficient transmission oil. Fill the transmission housing with oil. Transmission fluid filter element clogging. Clean or change transmission fluid filter.

Loss of power: Transmission fluid insufficient. Check and refill the transmission fluid. Stuck relief valve. Replace relief valve as required. Speed control linkage is defective or unadjusted. Adjust or install new linkage.

Transmission oil leaking: Clogged oil drain line. Clean or replace drain line. Broken seals or gaskets. Install new components. High internal transmission case pressure. Check transmission parts for damage or wear and replace if required.

John Deere 955 Hydraulic System Troubleshooting

Excessive hydraulic system heat: Hydraulic oil type is incorrect. Pour the correct type of oil. Contaminated hydraulic oil. Change hydraulic oil. There is air in the hydraulic system. Bleed hydraulic system. Main relief valve is damaged. Replace relief valve.

Low hydraulic oil pressure: Hydraulic oil is insufficient. Need to add oil. Clogged hydraulic fluid filter element. Clean or replace the hydraulic filter. Leaking hydraulic pipes. Check the system and repair leaks. Incorrect setting hydraulic spool valve. Use the correct setting. Damaged hydraulic pump. Replace or repair hydraulic fluid pump. Hydraulic cylinder failure. Replace or repair hydraulic cylinder.

3-point hitch won't lift or lifts slowly: Hydraulic pump not working. Repair or replace hydraulic fluid pump. Main relief valve malfunctioning. Change relief valve. Hydraulic control valve is faulty. Change or repair hydraulic valve. Damaged hydraulic cylinder. Repair or install a new hydraulic cylinder. Hydraulic fluid level low. Fill up the hydraulic fluid. Hydraulic oil filter is clogged. Replace hydraulic filter element or service if necessary. Excessive load on hitch. Load needs to be reduced.

Hitch cannot be lowered or lowering is too slowly: Defective hydraulic cylinder. Repair or change hydraulic cylinder. Incorrect setting hydraulic spool valve. Use the correct setting. Hitch cross shaft is damaged. Replace the shaft. The 3-point hitch is not adjusted. Adjust as required.

Jerky lowering or lifting of the hitch: Contaminated hydraulic oil. Change hydraulic oil. Hydraulic pump failure. Repair or replace hydraulic fluid pump. Air in hydraulic lines. Bleed hydraulic lines. Hydraulic spool valve block is faulty. Install a new valve or repair it. Defective hydraulic cylinder. Repair or install a new hydraulic cylinder.

John Deere 955 Steering System Troubleshooting

Steering wheel free play is excessive: Steering column coupling or shaft is worn. Replace defective component. Steering pump failure. Install a new hydraulic steering pump. Worn or loose steering linkage joints. Repair or replace steering linkage. Steering control valve is defective or worn. Change or repair control valve if required.

Heavy steering: Air lock in hydraulic steering system. Bleed the system of air. Steering filter clogging. Service steering filter. Steering oil level low. Add oil to steering system. Steering control valve has damage or wear. Inspect and replace as required. Steering pump malfunction. Repair or change steering pump. Faulty or stuck pump flow control valve. Flush or change flow control valve. Improperly mounted or worn steering column. Mount the steering column as required or change it. Front tires wear unevenly. Change the tires. Improper toe-in. Adjust toe-in properly. Leaking steering cylinder. Change worn piston seals or damaged piston rod.

Front wheels wander to left or right: Power steering control valve has damage or wear. Repair or replace the steering control valve. Steering cylinder damage. Repair or change steering cylinder. Incorrect toe-in. Adjust toe-in properly. Loose or worn steering linkage parts. Check and replace as required. Improperly adjusted or worn front wheel bearings. Replace or adjust the bearings correctly. Uneven wear on front tires. Replace the tires.

John Deere 955 Electrical System Troubleshooting

Battery won’t charge: Corroded or loose wire connections. Clean or tighten connections. Faulty electrical terminal connectors. Terminal connectors should be replaced. Battery is worn. Battery change required. Loose or worn belt. Need to adjust belt tension or replace belt.

Starter turns slow: Battery voltage is low. Battery is drained, charge it. Battery drains quickly. Service charging system or replace battery. Battery cables are disconnected or terminals are faulty. Check wiring and clean or replace terminals.

Starter will not work: Battery is drained or defective. Charge or replace the battery. Wiring is improperly connected or disconnected. Check wiring and connect properly. Low battery output. Low battery charging, charge as required. Faulty starter motor. Repair or replace 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