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Home / Wheel Loaders / Case Wheel Loaders / Case 921F

Case 921F Troubleshooting

The Case 921F wheel loader is powered by 411 cu.in (6.7L) FPT F4HFE613 six-cylinder direct injection turbocharged liquid-cooled diesel engine with a rated power of 185 hp (138 kW) at 2000 rpm. The Case 921F is equipped with a four-speed or five-speed autoshift transmission, power steering system, hydraulic wet disc brakes, and 23.5x25 standard tires. The hydraulic system has a variable displacement pump with fluid flow rate of 42.8 gpm (162 lpm). The wheel loader has a rated operating capacity of 15704 lbs (7123 kg) and tipping load of 31405 lbs (14245 kg). The max lift height is 162.1 inches (4120 mm) to hinge pin, and boom breakout force is 37553 lbs (17034 kg).

Engine Troubleshooting

Engine starts up hard or doesn't start
Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter element is dirty - Change filter element.
Dirty or faulty injection nozzles - Test injection nozzles and change if necessary.
Water or dirt in fuel system - Drain, flush, and service the system.
Improper valve clearance - Check and adjust.
Fuel injection pump is damaged - Repair or install new pump.

Diesel starts and stops
Air cleaner is dirty - Clean or change cleaner.
Clogged fuel filter - Change filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Fuel injection pump malfunction - Replace or repair injection pump.

Engine shuts off while running
Low coolant temperature - Warm up engine as required.
Fuel filter element is clogged - Clean or change the filter.
Air trapped in fuel system - Bleed air.
Damaged or dirty injection nozzles - Inspect nozzles and replace if necessary.
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.

Engine stops at low idle speed
Incorrect low idle speed adjustment - Need to adjust idle speed.
Fuel injection pump is broken - Replacement or repair required.
Defective fuel injectors - Inspect fuel injectors and change as required.
Valve out of adjustment - Check and adjust.

Engine power loss
Plugged air filter - Clean or change.
Clogged or burnt injection nozzle - Service or change injection nozzles.
Incorrect fuel injection pressure - Adjust to correct pressure.
Excessive valve clearance - Adjust to proper valve clearance.
Low idle speed setting is not correct - Correct low idle adjustment.
Fuel hoses or lines are dirty - Clean fuel system hoses and lines.
Blown cylinder head gasket - Install a new gasket.
Piston rings are damaged or leaking - Install new piston rings.

Engine overheated
Insufficient coolant - Top up coolant fluid and check system for leaks.
Low engine oil level - Check and refill engine oil.
Dirty radiator fins or faulty radiator cap - Change cap or clean radiator.
Excessive wear of the fan belt - Belt replacement is recommended.
Diesel engine is overloaded - Load reducing required.

Oil pressure is low
Low crankcase oil level - Add oil to the engine crankcase.
Oil filter element clogging - Replace or service engine oil filter.
Wrong oil viscosity - Drain crankcase and refill with correct oil.
Incorrect oil clearance in main bearing - Change bearings.
Oil pump is damaged - Replace as required.

Abnormal engine noise or knocking
Engine oil insufficient - Checking oil level and add if necessary.
Low coolant temperature - Warm up to required temperature.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.
Too low idle RPM - Adjustment required.
Damaged or clogged injectors - Replace fuel injectors.
Faulty or misaligned connecting rod - Connecting rod must be aligned or replaced.
Pistons are broken or worn - Have pistons replaced.

Transmission Troubleshooting

Transmission oil pressure is insufficient
Lack of transmission oil supply - Need to add transmission oil.
Transmission oil filter is dirty (if equipped) - Service or change transmission oil filter.
Relief valve failure - Change relief valve.

Transmission is making noise
Transmission oil level is low - Add oil to the transmission housing.
Transmission oil is dirty - Change the oil.
Improper backlash or worn gears - Adjust backlash correctly or replace the gears.
Worn or broken bearings - Change faulty bearings.
Damaged or worn gear shift forks - Install new shift forks.
Shaft splines are worn or damaged - Shaft need to be changed.

Difficult to shift gears
Gear shift linkage is worn or rusty - Install a new gear shift linkage.
Damaged or worn gear shift forks - Change the shift forks.
Defective parts in the gearshift mechanism - Replace defective parts.
Clutch is faulty or misadjusted - Adjust correctly or replace.

Transmission oil leaks
Transmission oil level is exceeded - Correct the oil volume.
Damaged gaskets or seals - Install new components.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure is incorrect - Adjust pressure correctly.
Defective or misadjusted main relief valve - Adjust or change relief valve.
Hydraulic oil contamination - Hydraulic oil change required.
Hydraulic fluid level is low - Check and refill the hydraulic fluid.
Defective hydraulic pump - Repair or replace pump if necessary.

Lift arm does not lower or raise
Lift controls are defective - Repair or change.
Hydraulic pump not working - Replace or repair pump if necessary.
Hydraulic control valve is faulty - Install a new hydraulic valve or repair it.
Defective hydraulic cylinder - Repair or change hydraulic cylinder.
Hydraulic oil is insufficient - Need to add oil.

Bucket is not working
Faulty bucket tilt controls - Repair or replace.
Hydraulic pump is broken - Repair or change pump if required.
Hydraulic control valve malfunction - Repair or replace the valve.
Bucket cylinder malfunction - Repair or change cylinder.
Hydraulic oil is insufficient - Check and refill the hydraulic oil.

Slow boom or bucket operation
Hydraulic pump is defective - Test the pump flow rate and change pump if required.
Hydraulic cylinder leaking - Install new cylinder seals.
Hydraulic fluid is insufficient - Fill the system to proper hydraulic fluid level.
Hydraulic control valve is not set properly or defective - Repair or adjust correctly.
Hydraulic pressure is low - Adjust it correctly.

Bucket or boom is working jerkily
Air leaks in hydraulic system - Bleed hydraulic system.
Plugged hydraulic oil filter - Change or clean oil filter.
Hydraulic oil contamination - The oil must be changed.
Scored cylinder tube or rod - Replace worn component.

Hydraulic pump is noisy
Hydraulic leaks or lack of oil - Correct hydraulic leaks or top up oil as needed.
Hydraulic filter is dirty - Clean or change the filter.
Suction line is dirty - Suction line must be serviced.
Air enters the pump - Need to bleed air.
Pump components are worn out - Change or rebuild pump.

Electrical Troubleshooting

Battery will not charge
Electrical wire connections are loose or corroded - Tighten or clean electrical wiring connections.
Defective battery terminal clamps - Change terminal clamps.
Bad cell in battery - Replace the battery.
Worn or loose belt - Change belt or adjust belt tension.

Starter motor cranks slow
Low battery power - Battery is drained, recharge it.
Battery won’t hold charge - Service charging system or change battery.
Bad battery terminals or disconnected wiring - Connect wiring correctly or install new terminals.

Starter will not work
Battery is drained or worn - Charge or replace the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery power is low - Battery is drained, recharge it.
Starter motor failing - Change or repair starter.

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