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| Home / Wheel Loaders / Caterpillar Wheel Loaders / Cat 908H2 |
Caterpillar 908H2 Troubleshooting
The
Cat 908H2 compact wheel loader is powered by Caterpillar C3.3B DIT 4-stroke
4-cylinder vertical in-line turbocharged liquid-cooled diesel engine with a
rated power of 69 hp (52 kW) at 2400 rpm. The Caterpillar 908H2 is equipped with
a two-speed or three-speed hydro transmission, articulated steering system,
hydraulic disc brakes, and 405/70R20 standard tires. The hydraulic system has a
pump with fluid flow rate of 22 gpm (83 lpm) or 33 gpm (125 lpm). The wheel
loader has a rated operating capacity of 3760 lbs (1705 kg) and tipping load of
7520 lbs (3410 kg). The max lift height is 134.2 inches (3410 mm) to hinge pin,
and boom breakout force is 10565 lbs (4800 kg).
| Engine Troubleshooting |
Engine hard to start or won't start
Air in fuel tank - Bleed fuel tank.
Fuel filter plugged - Replace filter element.
Fuel injection nozzles are faulty or clogged - Clean or replace injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Incorrect valve clearance - Adjust valve clearance according to specifications.
Fuel injection pump is not working correctly - Repair or install new pump.
Engine starts but stalls suddenly
Air filter is plugged - Install new air filter element.
Clogged fuel filter - Change or clean the filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Dirty or defective injectors - Test and replace fuel injectors if necessary.
Fuel injection pump is not working correctly - Repair or install new pump.
Engine stops unexpectedly during operation
Engine is not preheated - Warm up engine as required.
Fuel filter plugging - Change filter element.
Air in fuel tank - Bleed fuel tank.
Clogged or burnt injection nozzle - Check injection nozzles and replace if required.
Improper setting of fuel injection pump timing - Adjust according to specifications.
Engine stops while idling
Low idle speed setting is not correct - Adjust the low idle speed.
Damaged fuel injection pump - Change pump or rebuild it.
Dirty or defective injectors - Replace or clean fuel injectors.
Valve clearance is wrong - Adjustment procedure required.
Engine power is too low
Air filter is clogged - Install new air filter element.
Faulty fuel injection nozzles - Clean or change injection nozzles.
Insufficient fuel injection pressure - Correct the pressure settings.
Improper valve clearance - Need to adjust valve clearance.
Low idle speed setting is not correct - Test and adjust.
Clogged fuel lines or hoses - Clean fuel lines and hoses.
Blown cylinder head gasket - Install new cylinder head gasket.
Piston rings are defective or leaking - Piston rings replacement required.
Engine overheated
Insufficient coolant - Top up coolant fluid and check system for leaks.
Not enough engine oil - Add oil to the engine crankcase.
Clogged radiator core or leaking radiator cap - Clean radiator or install new cap.
Fan belt is worn or faulty - Belt change is required.
Diesel engine overloaded - Reduce load on the engine.
Low oil pressure
Low oil level - Check and refill the oil.
Engine oil filter is plugged - Service or change engine oil filter element.
Incorrect oil viscosity - Use oil of correct viscosity.
Main bearing oil clearance is excessive - Change bearings.
Defective oil pump - Repair or change.
Abnormal engine knocking or noise
Not enough engine oil - Checking oil level and add if necessary.
Coolant temperature is low - Warm up engine as required.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Low idle speed set incorrectly - Need to adjust idle speed.
Defective fuel injectors - Replace or clean fuel injectors.
Connecting rod is worn or misaligned - Need to align or replace the connecting rod.
Worn or broken pistons - Install new pistons.
| Hydrostatic Transmission Troubleshooting |
Hydrostatic transmission noise
Oil is dirty or oil level is too low - Fill to required level or change the transmission oil.
Speed control linkage is worn or unadjusted - Repair or adjust linkage.
Defective relief valve - Replace the valve.
Transmission overload - Load needs to be reduced.
Transmission components are damaged or worn - Replace or repair defective components.
Loss of power
Transmission fluid insufficient - Check and refill the transmission fluid.
Stuck relief valve - Replace the valve.
Speed control linkage is worn or unadjusted - Repair or adjust linkage.
Transmission fluid overheats
Transmission fluid level is low - Check and refill the transmission fluid.
Transmission fluid filter is clogged - Replace or service transmission fluid filter.
Cooling components are damaged or clogged - Check all cooling components and clean or replace if required.
Transmission overloaded - Load needs to be reduced.
Transmission fluid leaking
Seals or gaskets are worn - Install new gaskets or seal.
Transmission case internal pressure is too high - Check transmission parts for damage or wear and replace if required.
Clogged transmission fluid return pipe - Clean or change return pipe.
| Hydraulics Troubleshooting |
Hydraulic system is overheated
Incorrect hydraulic pressure setting - Hydraulic pressure must be set correctly.
Misadjusted or defective main relief valve - Adjust relief valve or change if required.
Hydraulic fluid is contaminated - Change hydraulic fluid.
Not enough hydraulic fluid in the system - Add fluid to the hydraulic system.
Defective hydraulic pump - Repair or replace pump if necessary.
Lift arm fails to drop or lift
Faulty lift controls - Repair or replace.
Hydraulic pump is broken - Replace or repair pump if necessary.
Hydraulic control valve is faulty - Repair or replace hydraulic valve.
Hydraulic cylinder is faulty - Repair or replace hydraulic cylinder.
Hydraulic fluid level low - Fill the system to proper hydraulic fluid level.
Bucket fails to tilt
Bucket controls failure - Change or repair.
Hydraulic pump not working - Repair or replace pump if necessary.
Hydraulic control valve is faulty - Change or repair hydraulic valve.
Defective bucket cylinder - Repair or replace cylinder.
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.
Slow boom or bucket operation
Hydraulic pump is worn - Check pump flow and install new pump if necessary.
Oil leaks from hydraulic cylinder - Install new cylinder seals.
Low hydraulic fluid level - Add fluid as required.
Defective or not adjusted hydraulic control valve - Repair or set properly.
Hydraulic system loosing pressure - Correct setting is required.
Lift arm or bucket is working jerkily
Air trapped in hydraulic system - Bleed air from hydraulic system.
Hydraulic oil filter element clogging - Clean or change the filter.
Hydraulic oil is contaminated - The oil must be changed.
Cylinder rod or tube is scratched - Change worn component.
Excessive hydraulic pump noise
Hydraulic leakage or low oil level - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter is dirty - Clean or install new filter.
Clogged suction line - Clean suction line as required.
Pump is sucking air - Air bleeding is required.
Pump components are worn out - Rebuild or replace hydraulic pump.
| Electrical Troubleshooting |
Battery cannot be charged
Loose or corroded electrical wiring connections - Tighten or service connections.
Electrical terminal connectors are defective - Change terminal connectors.
Battery failing - Battery change required.
Worn or loose belt - Belt needs to be adjusted or changed.
Starter turning slow
Battery capacity is low - Battery is drained, recharge it.
Battery will not hold charge - Service charging system or replace battery.
Disconnected wiring or bad battery terminals - Check cable connections and change or clean terminals.
Starter is not cranking
Battery is low or faulty - Recharge or replace battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery voltage is low - Battery needs to be recharged.
Damaged starter motor - Starter needs to be changed.
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| WHEEL LOADERS SPECIFICATIONS |
Bobcat
Caterpillar
Case
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