____________________________________________________________________________________

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

Case 721F XT Troubleshooting

The Case 721F XT wheel loader is powered by FPT F4HFE613Y four-cycle four-cylinder direct injection turbocharged liquid-cooled diesel engine with a rated power of 163 hp (121 kW) at 1600 rpm. The Case 721F XT is equipped with a 4x3 or 5x3 autoshift transmission, hydraulic power steering system, hydraulic wet disc brakes, and 20.5x25 standard tires. The hydraulic system has a variable displacement pump with fluid flow rate of 54.1 gpm (206 lpm). The wheel loader has a rated operating capacity of 9879 lbs (4480 kg) and tipping load of 19758 lbs (8962 kg). The maximum lift height is 163.8" (4160 mm) to hinge pin, and bucket breakout force is 27860 lbs (12637 kg).

Engine Troubleshooting

Engine hard to start or will not start
There is air in the fuel system - Bleed the system.
Clogged fuel filter - Clean or replace the filter.
Fuel injection nozzles are faulty or clogged - Change fuel injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Excessive valve clearance - Correct valve clearance needs to be set.
Fuel injection pump is not working correctly - Replace or repair injection pump.

Engine starts but immediately stalls
Dirty air cleaner - Install new air cleaner element.
Fuel filter element is dirty - Change or clean the filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Fuel injectors are dirty or defective - Test and replace fuel injectors if necessary.
Damaged fuel injection pump - Rebuild or change fuel pump.

Engine shuts off while running
Engine is not fully warmed up - Warm up to required temperature.
Clogged fuel filter - Change filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are clogged or faulty - Inspect nozzles and replace if necessary.
Timing of fuel injection pump is incorrect - Set it up as required.

Engine stalls while idling
Low idle speed setting is incorrect - Correct the settings.
Defective fuel injection pump - Repair or install new pump.
Fuel injectors are dirty or defective - Change or clean fuel injectors.
Valve clearance is out of adjustment - Need to adjust valve clearance.

Engine lacks power
Air cleaner is clogged - Install new air cleaner element.
Defective or clogged injection nozzle - Service or change injection nozzles.
Fuel injection pressure is wrong - Adjust pressure to proper level.
Excessive valve clearance - Check and adjust.
Incorrect low idle setting - Correct the settings.
Clogged fuel lines or hoses - Fuel hoses and lines must be clean.
Blown cylinder head gasket - Gasket should be replaced.
Piston rings are leaking or defective - Change piston rings.

Engine overheating
Low coolant level - Add coolant and check the components of cooling system.
Low engine oil level - Fill up the oil to required level.
Radiator fins are clogged or radiator cap is faulty - Replace cap or clean radiator.
Loose or damaged fan belt - Change as required.
Engine overload - Load reducing is recommended.

Insufficient oil pressure
Lack of oil - Add oil as required.
Oil filter element clogging - Clean or replace engine oil filter element.
Oil grade or viscosity is incorrect - Fill up with the proper oil viscosity.
Main bearing oil clearance is excessive - Bearing replacement required.
Oil pump malfunction - Replace as required.

Abnormal engine knocking or noise
Not enough engine oil - Check oil level and add oil as required.
Coolant temperature is low - Warm up to required temperature.
Wrong setting of fuel injection pump timing - Set it up as required.
Low idle speed setting is not correct - Adjust low idling as recommended.
Fuel injectors are dirty or defective - Replace fuel injectors.
Connecting rod is worn or misaligned - Connecting rod must be aligned or replaced.
Piston wear or scoring - Install new pistons.

Transmission Troubleshooting

Lack of transmission oil pressure
Transmission fluid insufficient - Add fluid to the transmission housing.
Transmission fluid filter element clogging (if equipped) - Replace or service transmission fluid filter.
Relief valve is damaged - Install a new relief valve.

Transmission noises
Lack of transmission oil supply - Fill the transmission housing to proper oil level.
Transmission oil is dirty - Change the oil.
Backlash is incorrect or gears are damaged - Adjust backlash properly or replace the gears.
Worn or cracked bearings - Bearings need to be replaced.
Shift forks are worn or bent - Shift forks need to be changed.
Shaft splines are stuck or worn out - Replace defective shaft.

Gear shift is hard
Worn or rusty gear shift linkage - Install a new gear shift linkage.
Worn or bent shift forks - Replace the shift forks.
Gearshift mechanism is damaged - Replace or repair the mechanism.
Clutch is worn or not adjusted - Adjust or install new clutch.

Transmission fluid leaking
High transmission oil level - Correct the oil level.
Seals or gaskets are worn - Install new gaskets or seal.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure incorrectly adjusted - Adjust pressure as required.
Misadjusted or defective main relief valve - Replace or set up the relief valve.
Hydraulic fluid is dirty - Fill up with fresh hydraulic fluid.
Lack of hydraulic fluid - Check and refill the hydraulic fluid.
Hydraulic pump is worn - Repair or install new hydraulic pump.

Boom won't lower or raise
Lift controls are faulty - Replace or repair.
Hydraulic pump malfunction - Repair or replace pump if necessary.
Damaged hydraulic control valve - Replace or repair the valve.
Hydraulic cylinder is defective - Replace or repair boom cylinder.
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.

Bucket won't move
Bucket controls are faulty - Replace or repair.
Hydraulic pump failure - Repair or change pump if required.
Defective hydraulic control valve - Repair or replace the valve.
Broken bucket cylinder - Change or repair cylinder.
Low hydraulic fluid level - Add fluid as required.

Boom or bucket functions slowly
Worn hydraulic oil pump - Check hydraulic pump flow and replace pump if necessary.
Hydraulic cylinder oil leakage - Repair leak by replacing the seals.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.
Hydraulic control valve is defective or set improper - Set properly or repair.
Hydraulic pressure has dropped - Correct adjustment is required.

Jerky operation of the bucket or boom
Hydraulic system is leaking air - Bleed air from system.
Hydraulic oil filter is dirty - Service or replace the hydraulic filter.
Contaminated hydraulic fluid - Fill up with fresh hydraulic fluid.
Cylinder rod or tube is scuffed - Change defective component.

Hydraulic pump is noisy
Not enough oil or hydraulic system leaking - Remedy hydraulic leakage or refill oil as necessary.
Clogged hydraulic filter - Service or change hydraulic filter.
Plugged suction line - Clean suction line as required.
Pump sucks air - Bleed air from hydraulics.
Faulty pump parts - Install new hydraulic pump or rebuild it.

Electrical Troubleshooting

Battery does not charge
Loose or corroded electrical wiring connections - Clean or tighten connections.
Defective battery terminal connectors - Terminal connectors need to be changed.
Defective battery - Replace the battery.
Loose or worn belt - Need to adjust belt tension or replace belt.

Starter cranks slow
Battery power is low - Low battery charging, charge as required.
Battery is draining quickly - Service battery or change it.
Battery cables are disconnected or terminals are faulty - Check wiring connections and replace or clean terminals.

Starter will not crank
Battery is discharged or defective - Recharge or replace battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery voltage - Charge the battery.
Starter motor failing - Change or repair starter.

____________________________________________________________________________________

WHEEL LOADERS SPECIFICATIONS

Bobcat

Caterpillar

Case

Doosan

John Deere

Kubota

Hitachi

JCB

Komatsu