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Home / Wheel Loaders / Caterpillar Wheel Loaders / Cat 908H

Caterpillar 908H Troubleshooting

The Cat 908H compact wheel loader is powered by 201 cu.in (3.3L) Caterpillar C3.4 4-cylinder indirect injection diesel engine with a rated power of 79 hp (59 kW) at 2500 rpm. The Caterpillar 908H is equipped with a hydrostatic transmission, power steering system, hydraulic dry disc brakes, and 405/70R20 standard tires. The hydraulic system has a pump with fluid flow rate of 22 gpm (83 lpm). The hydraulic pressure is 3400 psi (235 bar). The wheel loader has a rated operating capacity of 3759 lbs (1705 kg) and tipping load of 7518 lbs (3410 kg). The max lift height is 134.2 inches (3410 mm) to hinge pin, and boom breakout force is 10570 lbs (4805 kg).

Engine Troubleshooting

Engine hard to start or will not start
Air trapped in fuel system - Bleed air.
Clogged fuel filter - Clean the filter element.
Damaged or dirty injection nozzles - Change fuel injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is not correct - Correct valve clearance needs to be set.
Fuel injection pump is defective - Install a new fuel pump or repair.

Engine starts but then stalls
Air filter is plugged - Clean or change filter.
Clogged fuel filter - Replace filter element.
Fuel injection pump has loose connections - Tighten the connections.
Clogged or defective injectors - Change or clean fuel injectors.
Fuel injection pump malfunctioning - Change pump or rebuild it.

Engine shuts off suddenly while running
Engine not warmed up - Normalize the temperature by warming up the engine.
Fuel filter plugging - Clean the filter or install new filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles fault - Clean or change injection nozzles.
Incorrect adjustment of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.

Engine stalls when idling
Low idle speed setting is not correct - Adjust the low idle speed.
Fuel injection pump is damaged - Rebuild or install a new injection pump.
Defective fuel injectors - Replace or clean fuel injectors.
Excessive valve clearance - Have it adjusted.

Diesel engine loses power
Clogged air filter - Change or service air filter element.
Faulty or dirty injection nozzles - Service or change injection nozzles.
Fuel injection pressure is wrong - Check the fuel injection pressure and adjust if necessary.
The valve clearance is incorrect - Check and adjust as required.
Incorrect low idle setting - Correct low idle settings.
Fuel hoses or lines are dirty - Fuel hoses and lines must be clean.
Cylinder head gasket is defective - Cylinder-head gasket replacement required.
Piston rings are broken or leaking - Replace piston rings.

Engine overheats
Lack of engine coolant - Add coolant and check the components of cooling system.
Insufficient engine oil - Add oil to the engine crankcase.
Clogged radiator fins or leaking radiator cap - Change cap or clean radiator.
Fan belt slipping or worn - Fan belt must be replaced.
Engine is under excessive load - Load reducing is recommended.

Oil pressure is insufficient
Engine oil level low - Check and refill the oil.
Oil filter clogged - Change or clean engine oil filter element.
Incorrect oil viscosity - Use the specified type of engine oil.
Excessive oil clearance of crankshaft bearing - Install new bearings.
Oil pump is defective - Repair or change.

Engine knocks or noises
Engine oil level is insufficient - Add oil to the engine crankcase.
Engine is cold - Normalize the temperature by warming up the engine.
Fuel injection pump timing is not adjusted - Adjust fuel injection pump as required.
Low idle speed setting is incorrect - Adjust low idle speed.
Dirty or defective injectors - Test and replace fuel injectors if necessary.
Connecting rod is misaligned or defective - Alignment procedure or replacement is required.
Piston wear or scoring - Have pistons replaced.

Hydrostatic Transmission Troubleshooting

HST transmission is making noise
Low transmission oil level or contaminated oil - Add oil to proper level or pour fresh transmission oil.
Worn or unadjusted speed control linkage - Adjust or install new linkage.
Stuck relief valve - Install a new valve.
Transmission overload - Reduce loading.
Defective or worn transmission parts - Check hydrostatic transmission components for defect or damage and change if necessary.

Low power
Transmission oil insufficient - Add oil to the transmission housing.
Stuck relief valve - Change relief valve.
Speed control pedal linkage is damaged or out of adjustment - Repair or adjust linkage.

Transmission oil overheated
Transmission fluid insufficient - Fill the transmission housing to proper fluid level.
Transmission fluid filter is clogged - Service or change transmission fluid filter.
Clogged or damaged cooling components - Inspect all cooling components and replace or repair if necessary.
Transmission overloaded - Reduce the load is required.

Transmission oil leaking
Damaged seals or gaskets - Install new seal or gaskets.
Transmission case internal pressure is too high - Change defective parts.
Plugged oil return tube - Clean or replace return tube.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not adjusted correctly - Hydraulic pressure must be set correctly.
Main relief valve failure or improper setting - Replace or set up the relief valve.
Dirty hydraulic oil - Change hydraulic oil.
Lack of hydraulic oil - Add oil to the hydraulic system.
Worn hydraulic oil pump - Install new pump or repair it.

Boom won't lower or raise
Lift controls are defective - Inspect and repair if necessary.
Hydraulic pump failure - Repair or change pump if required.
Damaged hydraulic control valve - Repair or replace the valve.
Hydraulic cylinder not working - Change or repair lift cylinder.
Low hydraulic fluid level - Add fluid as required.

Bucket does not function
Bucket tilt controls are defective - Check and repair as required.
Hydraulic pump is broken - Repair or replace pump if necessary.
Damaged hydraulic control valve - Repair or replace hydraulic valve.
Hydraulic bucket cylinder not working - Change or repair cylinder.
Hydraulic oil level low - Checking hydraulic oil level and add if necessary.

Boom or bucket moves slowly
Faulty hydraulic oil pump - Check pump flow and change pump if necessary.
Oil leaks from hydraulic cylinder - Replace cylinder piston seals.
Hydraulic oil level low - Fill the system to proper hydraulic oil level.
Damaged or incorrect adjusted hydraulic control valve - Set correctly or repair.
Hydraulic system loosing pressure - Adjust pressure as required.

Jerky operation of the bucket or boom
Air in the hydraulic system - Air bleeding is required.
Hydraulic oil filter is dirty - Replace or clean the filter.
Contaminated hydraulic fluid - The fluid must be changed.
Cylinder tube or rod scoring - Replace worn component.

Hydraulic pump is excessively noisy
Hydraulic system leaking or not enough oil - Correct hydraulic leaks or top up oil as needed.
Hydraulic filter is dirty - Clean or install new filter.
Suction line is dirty - Need to clean the suction line.
Pump sucks air - Bleed air.
Worn pump components - Replace or rebuild the pump.

Electrical Troubleshooting

Battery won’t charge
Electrical wire connections are corroded or loose - Tighten or service cable connections.
Electrical terminal connectors are defective - Install new terminal connectors.
Defective battery - Install a new battery.
Damaged or loose belt - Belt needs to be adjusted or replaced.

Starter cranks slowly
Low battery power - Recharge the battery.
Battery runs out quickly - Service or replace the battery.
Disconnected cables or faulty battery terminals - Connect wires properly or change terminals.

Starter is not cranking
Battery is discharged or worn - Need to charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery voltage is low - Battery needs to be recharged.
Starter motor failure - Starter needs to be changed.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders