• All Manufacturers

  • Bobcat
  • Case
  • Caterpillar
  • Doosan
  • John Deere
  • Kubota

  Wheel Loaders

  • Bobcat L28
  • Cat 926M
  • Case 221D
  • John Deere 304H
  • Doosan DL280-7
  • Case 521E
  • Kubota R070
  • John Deere 624J

Home / Wheel Loaders / Caterpillar Wheel Loaders / Cat 907H

Caterpillar 907H Troubleshooting

The Caterpillar 907H compact wheel loader driveline system components: Caterpillar C3.4 vertical 4-cylinder indirect injection naturally aspirated diesel engine with a rated power of 70 hp (52 kW), and hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 22 gal/min (83 l/min). The system relief pressure is 3400 psi (235 bar). The Cat 907H is equipped with a power steering system, hydraulic dry disc brakes, and 405/70R18 tires. The wheel loader has a maximum 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 pipes - Bleed the fuel pipes.
Dirty fuel filter - Filter maintenance required.
Fuel injection nozzles are dirty or defective - Service or change injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is out of adjustment - Check and adjust.
Fuel injection pump malfunction - Repair or change injection pump.

Engine starts but stalls immediately
Air filter is plugged - Clean or change.
Dirty fuel filter - Clean the filter or install new filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Defective or clogged fuel injectors - Clean fuel injectors or change it.
Faulty fuel injection pump - Repair or install new pump.

Engine stops unexpectedly during operation
Low coolant temperature - Warm up to required temperature.
Fuel filter is plugged - Change filter element.
There is air in the fuel system - Bleed the system.
Defective injection nozzle - Replace injection nozzles.
Timing of fuel injection pump is incorrect - Check the fuel injection pump timing adjustment.

Engine stops while idle
Low idle speed adjustment is incorrect - Adjustment required.
Fuel injection pump is not operating properly - Repair or replace injection pump.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Valve clearance is not correct - Correct valve clearance.

Engine loses power
Air cleaner is clogged - Clean or change cleaner.
Damaged or dirty injection nozzles - Clean or change injection nozzles.
Improper fuel injection pressure - Adjust to proper pressure.
Incorrect valve clearance - Adjust to proper valve clearance.
Low idle speed set incorrectly - Correct low idle adjustment.
Dirt in the fuel hoses or lines - Clean fuel system hoses and lines.
Cylinder head gasket is worn - Install new cylinder head gasket.
Leaking or damaged piston rings - Piston rings need to be replaced.

Engine is overheated
Coolant level is low - The cooling system needs to be refilled and checked for faults.
Engine oil level is low - Checking oil level and add if necessary.
Radiator core is dirty or radiator cap is damaged - Install new cap or clean radiator.
Loose or defective fan belt - Install new fan belt.
Engine is under excessive load - Reduce load on the engine.

Oil pressure is low
Insufficient engine oil - Fill up the engine oil.
Oil filter element clogging - Service or change engine oil filter element.
Oil grade or viscosity is wrong - Use the specified type of engine oil.
Crankshaft bearing oil clearance is incorrect - Bearings need to be reinstalled.
Worn oil pump - Inspect and change as required.

Engine knocks or noises
Lack of engine oil - Need to add engine oil.
Engine is not warmed up to required temperature - Normalize the temperature by warming up the engine.
Improper setting of fuel injection pump timing - Adjust as recommended.
Improperly adjusted low idle speed - Correct the settings.
Damaged or clogged injectors - Test and replace fuel injectors if necessary.
Connecting rod is defective or misaligned - Replace or align connecting rod.
Pistons are worn or broken - Pistons need to be replaced.

Hydrostatic Transmission Troubleshooting

HST transmission makes excessive noise
Insufficient oil level or contaminated oil - Add oil to the correct level or fill the transmission with fresh oil.
Speed control linkage is defective or unadjusted - Change or adjust linkage.
Relief valve is damaged - Install a new valve.
Excessive loading - Reduce the load is required.
Defective or worn transmission parts - Check internal transmission parts for damage or wear and replace if required.

Lack of power
Low oil level - Check and refill the transmission oil.
Relief valve malfunction - Replace the valve.
Speed control pedal linkage is bent or not adjusted - Adjust or replace linkage.

Transmission overheats
Transmission fluid insufficient - Check and refill the transmission fluid.
Transmission fluid filter element clogging - Clean or change transmission fluid filter.
Cooling components are damaged or clogged - Check all cooling components and clean or replace if required.
Transmission overloaded - The load should be reduced.

Transmission fluid leakage
Broken seals or gaskets - Seals and gaskets replacement required.
High internal transmission housing pressure - Check hydrostatic transmission components for defect or damage and change if necessary.
Clogged transmission fluid return tube - Clean or replace return tube.

Hydraulics Troubleshooting

Hydraulic system is overheated
Hydraulic pressure is not correct - Correct setting is required.
Main relief valve is defective or unadjusted - Set up or change the relief valve.
Hydraulic oil contamination - Fill up with fresh hydraulic oil.
Hydraulic oil level is insufficient - Check oil level and add hydraulic oil as required.
Worn hydraulic oil pump - Repair or replace pump if necessary.

Lift arm can't drop or lift
Lift controls malfunction - Check and repair as required.
Hydraulic pump is broken - Replace or repair pump if necessary.
Defective hydraulic control valve - Install a new hydraulic valve or repair it.
Hydraulic cylinder is faulty - Repair or change hydraulic cylinder.
Low hydraulic oil level - Need to add oil.

Bucket does not function
Defective bucket controls - Repair or change.
Defective hydraulic pump - Repair or replace pump if necessary.
Defective hydraulic control valve - Repair or change the valve.
Hydraulic bucket cylinder is broken - Repair or install a new cylinder.
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.

Boom or bucket is working slowly
Faulty hydraulic oil pump - Check pump capacity and change if necessary.
Leaking hydraulic cylinder - Install new cylinder seals.
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.
Defective or not adjusted hydraulic control valve - Repair or adjust properly.
Low hydraulic pressure - Correct setting is required.

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

Hydraulic pump is excessively noisy
Leaking hydraulic system or insufficient oil level - Correct hydraulic leaks or top up oil as needed.
Hydraulic filter is dirty - Change or clean oil filter.
Suction line is dirty - Clean suction line as required.
Pump is sucking air - Air bleeding is required.
Worn pump parts - Rebuild or install new pump.

Electrical Troubleshooting

Battery does not charge
Loose or corroded wire connections - Clean or tighten connections.
Battery terminal connectors are faulty - Terminal connectors need to be changed.
Battery dead cell - Replace the battery.
Loose or defective belt - Adjust belt tension or change the belt.

Starter motor turns slow
Low battery power - Low battery charging, charge as required.
Battery is not holding charge - Service charging system or change battery.
Terminals are faulty or battery cables are disconnected - Check cable connections and replace or service terminals.

Starter is not working
Battery is low or faulty - Battery needs to be recharged or replaced.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery voltage - Recharge the battery.
Starter motor failing - Repair or replace starter.

____________________________________________________________________________________

WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders