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John Deere 790 Troubleshooting

John Deere 790 Engine Troubleshooting

Engine difficult to start or doesn't start: Dirty fuel filter. Change filter element. Air in the fuel system. Air bleeding. Damaged or dirty injection nozzles. Check injection nozzles and replace if required. Defective fuel injection pump. Rebuild or replace pump.

Engine shuts off suddenly while running: Incorrect adjustment of fuel injection pump timing. Adjust as recommended. Fuel filter element clogging. Replace the filter element. Engine is cold. Warm up engine as required.

Engine starts but immediately stalls: Fuel filter plugged. Service the filter. Damaged fuel injection pump. Replace or repair injection pump. Restricted intake air. Change air filter element.

Engine overheating: Clogged radiator core or leaking radiator cap. Replace cap or clean radiator. Low engine coolant. Refill to the correct level and inspect system for leaks. Loose or defective fan belt. If necessary, replace the belt. Engine oil level is insufficient. Checking oil level and add if necessary.

Engine power loss: Fuel injection nozzles are damaged or dirty. Clean or change injection nozzles. Dirt in the fuel lines or hoses. Clean fuel system lines and hoses. Air filter is clogged. Replace air filter element. Cylinder-head gasket is leaking. Replace cylinder head gasket.

Abnormal engine knocking or noise: Low coolant temperature. Warm up engine as required. Not enough engine oil. Fill up the oil to required level. Improper setting of fuel injection pump timing. Use the correct fuel injection pump timing adjustment. Piston wear or scoring. Pistons need to be replaced. Connecting rod is not aligned or defective. Align or change connecting rod.

Engine stops when idling: Incorrectly adjusted low idle speed. Correct low idle adjustment. The valve clearance is not adjusted. Need to adjust valve clearance. Fuel injection pump is not operating properly. Rebuild or change fuel pump.

Low oil pressure: Engine oil level low. Check and refill the oil. Defective oil pump. Remove and inspect oil pump. Dirty oil filter. Change or clean engine oil filter element.

John Deere 970 Transmission Troubleshooting

Transmission noises: Incorrect backlash or gears are worn. Replace defective gears or set backlash properly. Shift forks are worn or bent. Shift forks need to be changed. Shaft splines are damaged or worn. Change defective shaft. Lack of transmission fluid. Check and refill the transmission fluid. Bearings are damaged or worn. Change the bearings. Transmission fluid is dirty. Change the fluid.

Hard to shift gears: Worn or rusty gear shift linkage. Change or lubricate shift linkage. Clutch is faulty or misadjusted. Adjust clutch or replace if required. Shift forks are bent or worn out. Install new shift forks. Gearshift mechanism is damaged. Replace or repair the mechanism.

Low transmission pressure: Lack of transmission fluid. Check and refill the transmission fluid. Transmission fluid filter is clogged (if fitted). Replace or service transmission fluid filter. Relief valve is stuck. Replace the valve.

Transmission oil leakage: Broken seals or gaskets. Seals and gaskets need to be replaced. Transmission oil level is exceeded. Correct the oil volume.

John Deere 970 Hydraulic System Troubleshooting

Hydraulic system overheated: Improper hydraulic oil type. The proper type of hydraulic oil must be used. Hydraulic oil contamination. Change the oil. Air in hydraulic lines. Bleed hydraulic lines. Main relief valve is faulty. Replace relief valve.

Insufficient hydraulic oil pressure: Hydraulic fluid is insufficient. Add fluid as required. Clogged hydraulic oil filter element. Clean the hydraulic filter or install new filter element. Leaking hydraulic lines. Check the hydraulic system and fix leaks. Hydraulic control valve is not set properly. Adjust properly. Hydraulic pump failure. Repair or replace hydraulic fluid pump. Hydraulic cylinder not working. Repair or replace hydraulic cylinder.

3-point hitch cannot be raised or raising is too slowly: Hydraulic pump is faulty. Repair or replace hydraulic fluid pump. Main relief valve is faulty. Relief valve replacement required. Hydraulic spool valve is faulty. Install a new hydraulic valve or repair it. Damaged hydraulic cylinder. Replace or repair hydraulic cylinder. Insufficient hydraulic oil. Check and refill the hydraulic oil. Dirty hydraulic oil filter element. Change hydraulic filter element or clean if necessary. Heavy load on the hitch. Reduce hitch load.

Three-point hitch cannot be dropped or dropping is too slow: Hydraulic cylinder is defective. Repair or replace hydraulic cylinder. Hydraulic control valve block is out of adjustment. Control valve needs to be adjusted. Worn hitch rock shaft. Install a new shaft. 3-point hitch is out of adjustment. Need to make adjustments.

Hitch lift or lower is jerky: Hydraulic fluid contamination. Change hydraulic fluid. Defective hydraulic pump. Replace or repair hydraulic fluid pump. Air in hydraulic pipes. Bleed hydraulic pipes. Hydraulic control valve block is defective. Replace or repair the valve. Hydraulic cylinder not working. Repair or change hydraulic cylinder.

John Deere 970 Steering System Troubleshooting

Steering wheel free play is excessive: Worn steering column shaft or coupling. Replace defective part. Steering pump malfunction. Check the steering pump and replace if necessary. Worn or loose steering linkage assembly. Repair or replace steering linkage. Steering unit is damaged or worn. Inspect and replace as required.

Heavy steering: Air in steering system. Bleed air. Steering filter is clogged. Service steering filter. Not enough steering fluid. Fill up steering fluid to required level. Faulty or worn steering metering unit. Replace or repair steering unit as required. Faulty steering pump. Install a new hydraulic steering pump. Pump flow control valve is worn or stuck. Replace or clean flow control valve. Incorrectly installed or worn steering column. Install the steering column correctly or replace it. Tire pressure uneven. Inflate the tires correctly. Improper toe-in. Check toe-in and correct. Steering cylinder leakage. Change worn piston rod or damaged cylinder seals.

Tractor is pulling to right or left: Steering metering unit has damage or wear. Replace or repair steering unit as required. Steering cylinder is worn. Replace or repair steering cylinder. Incorrect toe-in. Adjust toe-in properly. Worn or loose steering linkage assembly. Check and change as required. Front wheel bearings are worn or incorrectly adjusted. Adjust correctly or install new bearings. Uneven tyre pressure. Inflate the tyres properly.

John Deere 970 Electrical System Troubleshooting

Battery will not charge: Loose or corroded wire connections. Tighten or service connections. Battery terminal connectors are defective. Install new terminal connectors. Battery is worn. Battery replacement required. Loose or worn belt. Adjust belt tension or install a new belt.

Starter turns slowly: Low battery output voltage. Low battery charging, charge as required. Battery drains quickly. Service charging system or replace battery. Disconnected battery cables or bad terminals. Check battery wires and service or replace terminals.

Starter motor won't turn: Battery is discharged or worn. Replace or charge as required. Wiring is improperly connected or disconnected. Check wiring and connect properly. Battery capacity is low. Recharge the battery. Damaged starter motor. Repair or install a new 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