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Home / Wheel Loaders / Case Wheel Loaders / Case 721G XR

Case 721G XR Troubleshooting

The Case 721G XR wheel loader driveline system components: FPT F4H FE613T 4-cycle 6-cylinder turbocharged diesel engine with a rated power of 144 hp (107 kW), and 4x3 autoshift transmission. The hydraulic system has two pumps with a rated capacity of 31.6 gal/min (120 l/min) and 22.6 gal/min (86 l/min). The system relief pressure is 3625 psi (250 bar). The Case 721G XR is equipped with a power steering, hydraulic wet disc brakes, and 20.5R25 tires. The wheel loader has a maximum lift height of 172.1" (4370 mm) and bucket breakout force of 33705 lbs (15290 kg). The rated operating capacity is 11540 lbs (5235 kg), and tipping load is 23080 lbs (10470 kg).

Engine Troubleshooting

Engine starts up hard or doesn't start
Air in fuel system - Bleed fuel system.
Fuel filter element is clogged - Clean the filter or install new filter element.
Defective or clogged injection nozzle - Inspect nozzles and replace if necessary.
Water in the fuel system - Change fuel and repair fuel system.
The valve clearance is incorrect - Have it adjusted.
Fuel injection pump damage - Replacement or repair required.

Engine starts but then stops
Air filter is plugged - Clean or change.
Clogged fuel filter - Service or replace the filter.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Clogged or defective injectors - Replace or clean fuel injectors.
Fuel injection pump damage - Rebuild or replace pump.

Engine stops suddenly during operation
Engine is not fully warmed up - Warm up to required temperature.
Fuel filter is plugged - Change filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Defective injection nozzle - Test injection nozzles and change if necessary.
Incorrect adjustment of fuel injection pump timing - Set it up as required.

Engine stalls while idling
Incorrect low idle speed adjustment - Test and adjust.
Fuel injection pump is not operating properly - Replacement or repair required.
Clogged or defective injectors - Inspect fuel injectors and change as required.
The valve clearance is not adjusted - Adjust valve clearance.

Engine power loss
Plugged air filter - Install new air filter element.
Defective injection nozzle - Clean or replace injection nozzles.
Fuel injection pressure is wrong - Test fuel injection pressure and adjust it correctly.
Excessive valve clearance - Correct valve clearance.
Low idle speed set incorrectly - Test and adjust.
Clogged fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Leaking cylinder head gasket - Install new cylinder head gasket.
Damaged or leaking piston rings - Install new piston rings.

Engine overheating
Engine has a lack of coolant - The cooling system needs to be refilled and checked for faults.
Lack of engine oil - Need to add engine oil.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or change cap.
Fan belt slipping or worn - Belt change is required.
Engine is overloaded - Reduce load on the engine.

Oil pressure is insufficient
Oil level is insufficient - Checking oil level and add if necessary.
Plugged engine oil filter - Change or clean engine oil filter element.
Incorrect engine oil Use oil of proper viscosity.
Incorrect crankshaft bearing oil clearance - Install new bearings.
Oil pump is defective - Remove and inspect oil pump.

Engine noise or knocking
Engine oil insufficient - Add oil to the engine crankcase.
Coolant temperature is low - Warm up the engine.
Improper setting of fuel injection pump timing - Adjust fuel injection pump as required.
Low idle speed adjustment is incorrect - Correct low idle adjustment.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Connecting rod is worn or not aligned - Need to replace or align the connecting rod.
Broken or worn pistons - Have pistons replaced.

Transmission Troubleshooting

Insufficient transmission fluid pressure
Transmission fluid level is low - Fill the transmission housing to proper fluid level.
Plugged transmission oil filter (if equipped) - Clean or replace the transmission filter.
Relief valve malfunction - Replace the valve.

Transmission noise
Insufficient transmission oil - Add oil to the transmission housing.
Transmission oil is contaminated - Transmission oil change required.
Defective gears or improper backlash - Replace defective gears or set backlash properly.
Worn or broken bearings - Bearings replacement required.
Worn or damaged gear shift forks - Shift forks need to be replaced.
Worn or damaged shaft splines - Replace the shaft.

Gears are hard to shift
Corroded or worn gear shift linkage - Shift linkage need to be replaced.
Shift forks are worn or bent - Change defective shift forks.
Worn out parts of the gearshift mechanism - Replace worn parts.
Worn or unadjusted clutch - Clutch replacement or adjustment required.

Transmission fluid leakage
High transmission fluid level - Drain the excess fluid.
Damaged seals or gaskets - Seals and gaskets replacement required.

Hydraulics Troubleshooting

Hydraulic system overheats
Hydraulic pressure is incorrect - Adjust it correctly.
Misadjusted or defective main relief valve - Adjust the valve or replace if necessary.
Dirty hydraulic oil - The oil must be changed.
Hydraulic oil level is low - Check oil level and add hydraulic oil as required.
Defective hydraulic pump - Change or repair hydraulic pump if required.

Lift arm fails to drop or lift
Lift controls are damaged - Inspect and repair if necessary.
Hydraulic pump is broken - Replace or repair pump if necessary.
Hydraulic control valve is faulty - Replace or repair the valve.
Faulty hydraulic cylinder - Replace or repair boom cylinder.
Low hydraulic oil level - Need to add oil.

Bucket does not function
Bucket controls are faulty - Change or repair.
Hydraulic pump failure - Repair or change pump if required.
Hydraulic control valve is defective - Install a new valve or repair it.
Hydraulic bucket cylinder is broken - Replace or repair cylinder.
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.

Boom or bucket is moving slowly
Worn hydraulic oil pump - Check pump performance and change it if necessary.
Oil leaks from hydraulic cylinder - Cylinder seals need to be replaced.
Low hydraulic fluid level - Fill up the hydraulic fluid.
Defective or not adjusted hydraulic control valve - Repair or set correctly.
Hydraulic system loosing pressure - Hydraulic pressure must be set correctly.

Lift arm or bucket jerks when working
Air trapped in hydraulic system - Bleed air from hydraulic system.
Hydraulic oil filter element is clogged - Service or replace the hydraulic filter.
Hydraulic oil contamination - The oil must be changed.
Cylinder tube or rod is scored - Replace defective component.

Hydraulic pump makes excessive noise
Not enough oil or hydraulic system leaking - Remedy hydraulic leakage or refill oil as necessary.
Clogged hydraulic filter - Clean or replace the filter.
Dirty suction line - Need to clean the suction line.
Air in hydraulic pump - Need to bleed air.
Pump parts are faulty - Rebuild or install new pump.

Electrical Troubleshooting

Battery cannot be charged
Electrical wire connections are corroded or loose - Tighten or clean connections.
Battery terminal clamps are defective - Change terminal clamps.
Bad cell in battery - Change the battery.
Worn or loose belt - Replace belt or adjust belt tension.

Starter cranks slow
Low battery voltage - Battery needs to be recharged.
Battery runs out quickly - Service battery or replace it.
Disconnected wires or corroded battery terminals - Connect wires properly or change terminals.

Starter motor won't turn
Battery is discharged or worn - Recharge or replace battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery capacity is low - Low battery charging, charge as required.
Starter motor failure - Starter should be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders