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Home / Wheel Loaders / Caterpillar Wheel Loaders / Cat 926M

Caterpillar 926M Troubleshooting

The Caterpillar 926M wheel loader driveline system components: a 427.7 cu.in (7.1L) Caterpillar C7.1 ACERT six-cylinder turbocharged diesel engine with a rated power of 148 hp (110 kW), and 4-range hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 40 gal/min (150 l/min). The system relief pressure is 3770 psi (260 bar). The Cat 926M is equipped with a power steering system, hydraulic wet disc brakes, and 20.5R25 tires. The wheel loader has a max lift height to hinge pin of 153.7" (3905 mm) and breakout force of 22540 lbs (10230 kg). The rated operating capacity is 8300 lbs (3765 kg), and tipping load is 16600 lbs (7530 kg).

Engine Troubleshooting

Engine starts up hard or doesn't start
Air trapped in fuel system - Bleed air.
Clogged fuel filter - Replace filter element.
Faulty or dirty injection nozzles - Clean or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is out of adjustment - Check and adjust.
Fuel injection pump is defective - Install a new pump or rebuild.

Engine starts and then shuts off
Plugged air cleaner - Clean or change.
Fuel filter plugged - Clean or change the filter.
Fuel injection pump is leaking - Repair any leaks.
Defective or clogged fuel injectors - Test and replace fuel injectors if necessary.
Fuel injection pump damage - Repair or install a new fuel pump.

Engine stops suddenly during operation
Engine is not preheated - Warm up the engine.
Clogged fuel filter - Replace the filter element.
There is air in the fuel system - Bleed the system.
Clogged injection nozzle - Check and replace nozzles if required.
Timing of fuel injection pump is incorrect - Use the correct fuel injection pump timing adjustment.

Engine stalls when idle
Low idle speed setting is not correct - Normalize low idle speed.
Fuel injection pump is damaged - Rebuild or change fuel pump.
Fuel injector fault - Inspect fuel injectors and change as required.
Valve clearance is wrong - Adjust valve clearance.

Diesel engine is losing power
Air filter is clogged - Clean or change filter.
Dirty or damaged injection nozzles - If necessary, replace with a new nozzle.
Fuel injection pressure is incorrect - Correct the pressure settings.
The valve clearance is not adjusted - Adjust valve clearance.
Improperly adjusted low idle speed - Need to adjust idle speed.
Dirty fuel hoses or lines - Clean fuel system hoses and lines.
Cylinder head gasket is worn - Replace cylinder head gasket.
Piston rings are worn or defective - Piston rings replacement required.

Engine overheated
Coolant level is low - Refill to the correct level and inspect system for leaks.
Engine oil level is low - Add oil to the engine crankcase.
Defective radiator cap or clogged radiator fins - Change cap or clean radiator.
Fan belt slipping or worn - Replace as required.
Diesel engine overloaded - Reduce load on the engine.

Oil pressure too low
Low oil level - Check oil level and add oil as required.
Oil filter clogging - Change or service engine oil filter.
Wrong oil viscosity - Use the specified type of engine oil.
Excessive oil clearance of crankshaft bearing - Bearings need to be reinstalled.
Oil pump failure - Inspect and change as required.

Engine noises or knocks
Not enough engine oil - Add oil to the engine crankcase.
Coolant temperature is low - Warm up the engine.
Improper fuel injection timing - Adjust according to specifications.
Incorrect low idle setting - Adjust low idle speed.
Fuel injectors are dirty or defective - Inspect fuel injectors and change as required.
Connecting rod misalignment or failure - Replace or align connecting rod.
Piston wear or scoring - Have pistons replaced.

Hydrostatic Transmission Troubleshooting

HST transmission is excessively noisy
Dirty transmission fluid or insufficient fluid level - Fill to required level or change the fluid.
Defective or not adjusted speed control pedal linkage - Adjust or replace linkage.
Defective relief valve - Replace valve as required.
Transmission is under excessive load - Reduce transmission load.
Defective or worn transmission parts - After disassembly and inspection, replace defective components.

Low power
Insufficient transmission oil - Fill the transmission housing to proper oil level.
Defective relief valve - Replace relief valve as required.
Speed control linkage is defective or unadjusted - Adjust or change linkage.

Transmission fluid over heats
Insufficient transmission oil - Add oil to the transmission housing.
Transmission oil filter is clogged - Service or replace the transmission oil filter.
Plugged or defective cooling components - Check all cooling components and repair or change if required.
Transmission overloaded - The load should be reduced.

Transmission fluid leaking
Damaged gaskets or seals - Install new components.
High internal transmission housing pressure - Change defective components.
Clogged oil return pipe - Clean or change return pipe.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure incorrectly adjusted - Correct adjustment is required.
Unadjusted or defective main relief valve - Adjust or replace the relief valve.
Contaminated hydraulic oil - Fill up with fresh hydraulic oil.
Hydraulic fluid level is insufficient - Check and refill the hydraulic fluid.
Hydraulic pump is faulty - Repair or install new hydraulic pump.

Boom does not raise or lower
Lift controls malfunction - Check and repair as required.
Hydraulic pump failure - Repair or install new hydraulic pump.
Damaged hydraulic control valve - Repair or change the valve.
Hydraulic cylinder is broken - Install a new boom cylinder or repair it.
Hydraulic oil level low - Fill the system to proper hydraulic oil level.

Bucket does not function
Defective bucket controls - Change or repair.
Hydraulic pump not working - Repair or change pump if required.
Hydraulic control valve is faulty - Repair or change the valve.
Broken bucket cylinder - Replace or repair cylinder.
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.

Slow boom or bucket action
Faulty hydraulic oil pump - Flow-rate pump and change pump if necessary.
Hydraulic cylinder leaking - Replace cylinder piston seals.
Hydraulic oil is insufficient - Need to add oil.
Worn or unadjusted hydraulic control valve - Repair or adjust properly.
Low hydraulic pressure - Correct setting is required.

Bucket or boom is moving jerkily
Air in the hydraulic system - Need to bleed air.
Hydraulic oil filter is dirty - Change or clean oil filter.
Contaminated hydraulic fluid - Change hydraulic fluid.
Cylinder rod or tube is scratched - Change defective component.

Excessive hydraulic pump noise
Lack of oil or hydraulic leakage - Remedy hydraulic leakage or refill oil as necessary.
Plugged hydraulic filter - Clean or replace the filter.
Suction line is clogged - Suction line must be serviced.
Air in hydraulic pump - Bleed air.
Pump components are damaged - Rebuild or change hydraulic pump.

Electrical Troubleshooting

Battery won’t charge
Electrical wire connections are loose or corroded - Clean or tighten connections.
Defective battery terminal clamps - Change terminal clamps.
Dead cell in battery - Battery change required.
Belt is loose or defective - Adjust belt tension or replace belt.

Starter turning slow
Low battery capacity - Battery is drained, charge it.
Battery runs out quickly - Service battery or change it.
Terminals are faulty or battery cables are disconnected - Connect wiring properly or install new terminals.

Starter does not work
Battery is drained or worn - Need to charge or replace the battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery output voltage - Low battery charging, charge as required.
Starter motor failing - Starter should be changed.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders