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Home / Wheel Loaders / Case Wheel Loaders / Case 721F

Case 721F Troubleshooting

The Case 721F wheel loader driveline system components: FPT F4HFE613Y 6-cylinder turbocharged liquid-cooled diesel engine with a rated power of 163 hp (121 kW), and 4-speed or 5-speed autoshift transmission. The hydraulic system has a pump with a rated capacity of 54.1 gal/min (206 l/min). The system relief pressure is 3625 psi (250 bar). The Case 721F is equipped with an articulated steering system, hydraulic wet disc brakes, and 20.5x25 tires. The wheel loader has a maximum lift height to hinge pin of 156.7" (3980 mm) and boom breakout force of 31383 lbs (14235 kg). The rated operating capacity is 10524 lbs (4774 kg), and tipping load is 21048 lbs (9547 kg).

Engine Troubleshooting

Engine starts hard or won't start
Air in fuel tank - Bleed fuel tank.
Dirty fuel filter - Replace filter element.
Dirty or faulty injection nozzles - Check and replace nozzles if required.
Water in the fuel system - Change fuel and repair fuel system.
The valve clearance is incorrect - Adjust valve clearance.
Fuel injection pump is damaged - Change pump or rebuild it.

Engine starts but stalls suddenly
Air cleaner is clogged - Clean or change.
Fuel filter element is clogged - Change filter element.
Fuel injection pump is leaking - Repair any leaks.
Fuel injectors are faulty or clogged - Replace or clean fuel injectors.
Fuel injection pump is not working correctly - Install a new fuel pump or repair.

Engine stalls after running
Coolant temperature is low - Warm up the engine.
Dirty fuel filter - Change filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Damaged or dirty injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel injection pump timing is wrong - Check the fuel injection pump timing adjustment.

Engine stops when idle
Low idle speed set incorrectly - Adjust low idling as recommended.
Fuel injection pump is not working correctly - Install a new pump or rebuild.
Clogged or defective injectors - Replace fuel injectors.
Valve clearance is wrong - Check and adjust.

Loss of engine power
Clogged air filter - Replace or clean air filter element.
Fuel injection nozzles are dirty or defective - Install a new kit of correctly balanced nozzles.
Fuel injection pressure is wrong - Check the fuel injection pressure and adjust if necessary.
The valve clearance is incorrect - Adjust valve clearance according to specifications.
Low idle speed set incorrectly - Need to adjust idle speed.
Clogged fuel hoses or lines - Clean fuel hoses and lines.
Cylinder head gasket is defective - Replace cylinder head gasket.
Piston rings are broken or leaking - Replace the piston rings as required.

Engine is overheated
Engine has a lack of coolant - Add coolant fluid and inspect the cooling system for leaks.
Not enough engine oil - Check and refill engine oil.
Dirty radiator core or faulty radiator cap - Clean radiator or replace cap.
Damaged or worn fan belt - Fan belt must be replaced.
Engine overloaded - Reduce engine load.

Oil pressure is insufficient
Low oil level - Add oil to the engine crankcase.
Dirty oil filter - Replace or service engine oil filter.
Improper type of engine oil - Use the specified type of engine oil.
Excessive crankshaft bearing oil clearance - Change bearings.
Oil pump is worn or damaged - Remove and inspect oil pump.

Engine noise or knocking
Engine oil insufficient - Check and refill engine oil.
Engine is cold - Warm up engine as required.
Fuel injection pump timing is not adjusted - Check the fuel injection pump timing adjustment.
Incorrectly adjusted low idle speed - Test and adjust.
Clogged or defective injectors - Change or clean fuel injectors.
Connecting rod is defective or not aligned - Alignment procedure or replacement is required.
Pistons are scored or worn - Replace the pistons.

Transmission Troubleshooting

Low transmission pressure
Transmission fluid level is low - Checking transmission fluid level and add if necessary.
Transmission fluid filter element is clogged (if equipped) - Service or change transmission fluid filter.
Defective relief valve - Change the valve.

Transmission noise
Lack of transmission fluid - Checking transmission fluid level and add if necessary.
Transmission oil contamination - Fill up with fresh transmission oil.
Worn gears or incorrect backlash - Adjust backlash correctly or replace the gears.
Worn or broken bearings - Bearings need to be changed.
Damaged or worn gear shift forks - Replace defective shift forks.
Worn or stuck shaft splines - Change the shaft.

Difficult to shift gears
Stuck or worn gear shift linkage - Install new shift linkage.
Shift forks are bent or worn out - Shift forks need to be replaced.
Defective parts in the gearshift mechanism - Replace defective parts.
Worn or unadjusted clutch - Clutch replacement or adjustment required.

Transmission oil leaking
Transmission oil level is exceeded - Correct the oil volume.
Broken seals or gaskets - Gaskets or seal need to be replaced.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not correct - Correct adjustment is required.
Main relief valve improper adjustment or failure - Adjust relief valve or change if required.
Contaminated hydraulic fluid - Hydraulic fluid change required.
Not enough hydraulic oil in the system - Add oil to the hydraulic system.
Hydraulic pump is faulty - Repair or replace pump if necessary.

Boom fails to lift or drop
Lift controls malfunction - Change or repair.
Hydraulic pump is broken - Repair or change pump if required.
Defective hydraulic control valve - Change or repair hydraulic valve.
Hydraulic cylinder is faulty - Repair or install a new lift cylinder.
Hydraulic fluid level low - Add fluid as required.

Bucket tilt does not work
Bucket controls failure - Inspect and repair if necessary.
Hydraulic pump is broken - Change or repair hydraulic pump if required.
Faulty hydraulic control valve - Install a new valve or repair it.
Damaged bucket cylinder - Repair or install a new cylinder.
Hydraulic fluid level low - Fill the system to proper hydraulic fluid level.

Bucket or lift arm runs slowly
Hydraulic pump is defective - Check pump capacity and change if necessary.
Hydraulic cylinder leaking - Cylinder seals need to be replaced.
Hydraulic fluid level low - Fill the system to proper hydraulic fluid level.
Faulty or incorrect setting hydraulic control valve - Set correctly or repair.
Hydraulic system loosing pressure - Hydraulic pressure must be set correctly.

Bucket or boom movements are jerky
Air in hydraulic system - Air bleeding is required.
Clogged hydraulic oil filter element - Service or change the hydraulic filter.
Hydraulic fluid contamination - The fluid must be changed.
Cylinder rod or tube is scratched - Change damaged component.

Hydraulic pump is excessively noisy
Hydraulic leakage or lack of oil - Refill hydraulic oil or repair leaks in system.
Hydraulic filter is dirty - Clean or install new filter.
Clogged suction line - Need to clean the suction line.
Air in hydraulic pump - Air bleeding is required.
Pump parts are damaged - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery cannot be charged
Loose or corroded wire connections - Clean or tighten wiring connections.
Defective battery terminal clamps - Replace terminal clamps.
Bad cell in battery - Install a new battery.
Loose or defective belt - Adjust belt tension or change the belt.

Starter cranks slowly
Battery capacity is low - Charge the battery.
Battery won’t hold charge - Service charging system or change battery.
Disconnected wires or corroded battery terminals - Check cable connections and change or clean terminals.

Starter will not work
Battery is low or faulty - Need to charge or replace the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery power - Battery is drained, charge it.
Faulty starter motor - Repair or replace starter.

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