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Home / Wheel Loaders / Caterpillar Wheel Loaders / Cat 907H2

Caterpillar 907H2 Troubleshooting

The Caterpillar 907H2 compact wheel loader driveline system components: Cat C3.3B DIT 4-cycle 4-cylinder direct injection turbocharged diesel engine with a rated power of 69 hp (52 kW), and 2-speed or 3-speed hydrostatic transmission. The hydraulic system has a piston pump with a rated capacity of 22 gal/min (83 l/min) or 33 gal/min (125 l/min). The Cat 907H2 is equipped with an articulated steering system, hydraulic disc brakes, and 405/70R18 or 340/80R18 tires. The wheel loader has a max lift height of 127.1" (3230 mm) and bucket breakout force of 9440 lbs (4290 kg). The rated operating capacity is 3495 lbs (1585 kg), and tipping load is 6990 lbs (3170 kg).

Engine Troubleshooting

Engine starts hard or doesn't start
Air in the fuel system - Air bleeding.
Dirty fuel filter - Change filter element.
Burnt or defective injection nozzle - Inspect nozzles and replace if necessary.
Water or dirt in fuel system - Drain, flush, and service the system.
The valve clearance is not adjusted - Have it adjusted.
Defective fuel injection pump - Rebuild or replace pump.

Engine starts but then stalls
Air cleaner is clogged - Clean or change cleaner.
Fuel filter element clogging - Clean or change the filter.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Fuel injectors are faulty or clogged - Clean fuel injectors or change it.
Faulty fuel injection pump - Rebuild or replace pump.

Engine shuts off suddenly during operation
Engine is not preheated - Warm up to required temperature.
Fuel filter plugging - Change the filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are faulty or clogged - Clean or change injection nozzles.
Fuel injection pump timing is not adjusted - Set up as recommended.

Engine stalls while idling
Too low idle RPM - Correct low idle settings.
Fuel injection pump is faulty - Rebuild or change fuel pump.
Fuel injector fault - Clean or replace fuel injectors.
Valve out of adjustment - Correct valve clearance needs to be set.

Diesel engine is losing power
Clogged air cleaner - Clean or change.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Fuel injection pressure is wrong - Test fuel injection pressure and adjust it correctly.
Incorrect valve clearance - Adjustment procedure required.
Incorrectly set low idle speed - Adjust low idle speed.
Clogged fuel lines or hoses - Clean fuel hoses and lines.
Defective cylinder head gasket - Install a new gasket.
Worn or broken piston rings - Replace the piston rings as required.

Engine overheating
Coolant level is low - Add coolant fluid and inspect the cooling system for leaks.
Lack of engine oil - Add oil to the engine crankcase.
Radiator core is clogged or radiator cap is leaking - Clean radiator or install new cap.
Fan belt slipping or worn - Change as required.
Engine overload - Reduce engine load.

Oil pressure too low
Oil level is low - Check oil level and add oil as required.
Dirty oil filter - Replace or clean engine oil filter element.
Wrong oil viscosity - Use correct viscosity oil.
Crankshaft bearing oil clearance is incorrect - Change bearings.
Oil pump is defective - Check and replace if necessary.

Engine knocking or noise
Insufficient engine oil - Checking oil level and add if necessary.
Coolant temperature is low - Warm up to required temperature.
Improper setting of fuel injection pump timing - Set it up as required.
Low idle speed setting is not correct - Adjust the low idle speed.
Damaged or clogged injectors - Replace fuel injectors.
Misaligned or defective connecting rod - Alignment procedure or replacement is required.
Pistons are worn or scored - Replace the pistons.

Hydrostatic Transmission Troubleshooting

HST transmission makes noise
Contaminated transmission fluid or low fluid level - Top up to proper level or change transmission fluid.
Speed control linkage is defective or unadjusted - Adjust or repair linkage.
Stuck relief valve - Replace the valve.
Excessive transmission load - Reduce loading.
Transmission components are damaged or worn - After disassembling and inspection, change defective components.

Low power
Insufficient transmission fluid - Checking transmission fluid level and add if necessary.
Relief valve is damaged - Replace the valve.
Speed control linkage is defective or unadjusted - Repair or adjust linkage.

Transmission overheats
Insufficient transmission fluid - Need to add transmission fluid.
Transmission fluid filter is clogged - Service or replace the transmission fluid filter.
Clogged or damaged cooling components - Check all cooling components and repair or change if required.
Excessive transmission load - The load should be reduced.

Transmission fluid leaking
Seals or gaskets are worn - Install new components.
High internal transmission case pressure - Check hydrostatic transmission components for defect or damage and change if necessary.
Oil drain line is clogged - Clean or change the line.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not adjusted correctly - Adjust pressure as required.
Main relief valve failure or improper setting - Adjust or change relief valve.
Hydraulic oil is contaminated - Hydraulic oil change required.
Hydraulic oil level is insufficient - Fill up the hydraulic oil.
Hydraulic pump is defective - Repair or replace pump if necessary.

Lift arm won't raise or lower
Lift controls are faulty - Repair or change.
Hydraulic pump malfunction - Replace or repair pump if necessary.
Hydraulic control valve failure - Repair or change the valve.
Damaged hydraulic cylinder - Replace or repair boom cylinder.
Hydraulic fluid level low - Fill the system to proper hydraulic fluid level.

Bucket fails to tilt
Bucket tilt controls are damaged - Repair or replace.
Damaged hydraulic oil pump - Repair or change pump if required.
Faulty hydraulic control valve - Repair or change the valve.
Bucket cylinder failure - Repair or change cylinder.
Hydraulic fluid is insufficient - Add fluid as required.

Boom or bucket functions slowly
Hydraulic pump is worn - Test pump performance and replace pump if necessary.
Hydraulic cylinder oil leakage - Cylinder seals need to be replaced.
Hydraulic fluid is insufficient - Add fluid as required.
Worn or unadjusted hydraulic control valve - Repair or adjust properly.
Hydraulic system loosing pressure - Hydraulic pressure must be set correctly.

Bucket or boom is jerky
Hydraulic system is leaking air - Need to bleed air.
Hydraulic oil filter element clogging - Clean or change the filter.
Hydraulic oil is dirty - Hydraulic oil change required.
Scored cylinder tube or rod - Replace worn component.

Hydraulic pump is noisy
Low oil level or hydraulic leaks - Repair hydraulic leaks or add oil as required.
Dirty hydraulic filter - Service or replace hydraulic filter.
Suction line clogging - Service the suction line.
Air enters the pump - Need to bleed air.
Faulty pump components - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery is not charging
Loose or corroded wire connections - Tighten or service cable connections.
Battery terminal connectors are defective - Terminal connectors should be replaced.
Faulty cell in battery - Battery replacement required.
Belt is damaged or loose - Replace belt or adjust belt tension.

Starter motor cranks slow
Low battery output voltage - Low battery charging, charge as required.
Battery discharges quickly - Service charging system or install new battery.
Battery cables are disconnected or terminals are faulty - Check cable connections and change or clean terminals.

Starter motor is not working
Battery is drained or defective - Charge or change the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery capacity is low - Battery needs to be recharged.
Starter motor is faulty - Starter should be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders