• All Manufacturers

  • Bobcat
  • Case
  • Caterpillar
  • Doosan
  • John Deere
  • Kubota
  • JCB
  • Komatsu

  Wheel Loaders

  • Bobcat L28
  • Cat 926M
  • Case 221D
  • John Deere 304H
  • Doosan DL280-7
  • Case 521E
  • Kubota R070
  • John Deere 624J

Home / Wheel Loaders / Case Wheel Loaders / Case W4

Case W4 Troubleshooting

The Case W4 wheel loader is powered by 127 cu.in (2.1L) Mitsubishi 4DQ50 4-cylinder naturally aspirated water-cooled diesel engine with a rated power of 37 hp (27.6 kW) at 3000 rpm. The Case W4 is equipped with a two-speed hydrostatic transmission, hydraulic power steering, mechanical disc brakes, and 12.5Lx15 standard tires. The open center hydraulic system has a pump with fluid flow rate of 15 gpm (57 lpm). The hydraulic pressure is 2650 psi (180 bar). The wheel loader has a rated operating capacity of 1715 lbs (780 kg) and tipping load of 3430 lbs (1555 kg). The maximum lift height is 112" (2840 mm) to hinge pin, and bucket breakout force is 5250 lbs (2380 kg).

Engine Troubleshooting

Engine difficult to start or doesn't start
Air in fuel system - Bleed fuel system.
Clogged fuel filter - Clean the filter element.
Clogged or defective injection nozzles - Clean or change injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is wrong - Adjust valve clearance.
Fuel injection pump is faulty - Replacement or repair required.

Diesel starts and stalls immediately
Clogged air cleaner - Clean or change.
Fuel filter element is dirty - Service or replace the filter.
Fuel injection pump has loose connections - Tighten the connections.
Damaged or clogged injectors - Replace or clean fuel injectors.
Defective fuel injection pump - Repair or replace injection pump.

Engine stalls during operation
Engine is cold - Warm up to required temperature.
Fuel filter element is clogged - Replace filter element.
Air in fuel system - Bleed fuel system.
Defective or clogged injection nozzle - If necessary, replace with a new nozzle.
Wrong setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.

Engine stops at low idle speed
Low idle speed adjustment is incorrect - Need to adjust idle speed.
Fuel injection pump malfunction - Change or repair the pump.
Fuel injectors are faulty or clogged - Change or clean fuel injectors.
Valve clearance is not correct - Need to adjust valve clearance.

Engine loses power
Plugged air filter - Clean or change.
Clogged or burnt injection nozzle - Install a new kit of correctly balanced nozzles.
Uneven fuel injection pressure - Adjust to correct pressure.
Improper valve clearance - Adjust valve clearance.
Incorrect low idle speed adjustment - Need to adjust idle speed.
Restricted fuel lines or hoses - Service fuel hoses and lines.
Cylinder head gasket is blown - Gasket should be replaced.
Piston rings are worn or defective - Change piston rings.

Engine overheats
Not enough coolant - Fill radiator to proper level and check components for faults.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Faulty radiator cap or dirty radiator fins - Install new cap or clean radiator.
Fan belt is broken or worn - If necessary, replace the belt.
Diesel engine overloaded - Reduce load on the engine.

Oil pressure too low
Low oil level - Fill crankcase to proper oil level.
Dirty oil filter element - Change or clean engine oil filter element.
Different type of engine oil - Use oil of proper viscosity.
Incorrect oil clearance in crankshaft bearing - Bearings need to be reinstalled.
Oil pump failure - Check and replace if necessary.

Engine knocking sound or abnormal noise
Engine oil level is insufficient - Add oil to the engine crankcase.
Engine is cold - Warm up to required temperature.
Timing of fuel injection pump is incorrect - Adjust as recommended.
Incorrect low idle setting - Adjust as required.
Defective fuel injectors - Clean fuel injectors or change it.
Connecting rod is worn or misaligned - Need to change or align the connecting rod.
Piston wear or scoring - Pistons need to be replaced.

Transmission Troubleshooting

Transmission fluid pressure is insufficient
Transmission fluid insufficient - Add fluid to the transmission housing.
Clogged transmission fluid filter (if equipped) - Service or change transmission fluid filter.
Stuck relief valve - Install a new valve.

Transmission is making noise
Transmission oil insufficient - Check and refill the transmission oil.
Transmission fluid is dirty - Change the fluid.
Gears are defective or backlash is improper - Adjust backlash properly or replace the gears.
Worn or broken bearings - Faulty bearings should be replaced.
Worn or damaged gear shift forks - Shift forks need to be replaced.
Shaft splines are worn or stuck - Replace defective shaft.

Difficulty shifting gears
Gear shift linkage is worn or rusty - Lubricate or replace shift linkage.
Worn or damaged gear shift forks - Install new shift forks.
Defective parts in the gearshift mechanism - Replace defective parts.
Worn or improperly adjusted clutch - Clutch needs to be adjusted or changed.

Transmission oil overheating
Insufficient transmission oil - Check transmission oil level and add oil as required.
Dirty transmission oil filter element - Clean or replace the transmission filter.
Plugged or defective cooling components - Inspect all cooling components and service or change if necessary.
Transmission overloaded - Load needs to be reduced.

Transmission oil leakage
High transmission fluid level - Drain the excess fluid.
Broken seals or gaskets - Install new gaskets or seal.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not correct - Set pressure correctly.
Misadjusted or defective main relief valve - Adjust relief valve or change if required.
Dirty hydraulic fluid - The fluid must be changed.
Lack of hydraulic oil - Add oil to the hydraulic system.
Defective hydraulic pump - Install new pump or repair it.

Boom cannot be lowered or raised
Damaged lift controls - Replace or repair.
Defective hydraulic pump - Replace or repair pump if necessary.
Faulty hydraulic control valve - Repair or change hydraulic valve.
Faulty hydraulic cylinder - Replace or repair boom cylinder.
Hydraulic oil level low - Fill the system to proper hydraulic oil level.

Bucket can't tilt
Bucket controls failure - Check and repair as required.
Hydraulic pump malfunction - Repair or replace pump if necessary.
Hydraulic control valve failure - Repair or change hydraulic valve.
Damaged bucket cylinder - Replace or repair cylinder.
Low hydraulic oil level - Check and refill the hydraulic oil.

Bucket or lift arm is working slowly
Faulty hydraulic oil pump - Test the pump flow rate and install new pump if required.
Leaking hydraulic cylinder - Cylinder seals need to be replaced.
Low hydraulic fluid level - Add fluid as required.
Hydraulic control valve is faulty or out of adjustment - Set properly or repair.
Hydraulic pressure loss - Correct setting is required.

Bucket or boom movements are jerky
Air in hydraulic system - Air bleeding is required.
Dirty hydraulic oil filter - Change or clean oil filter.
Hydraulic oil contamination - Hydraulic oil change required.
Scored cylinder tube or rod - Replace defective component.

Excessive hydraulic pump noise
Lack of oil or hydraulic leakage - Repair hydraulic leaks or add oil as required.
Dirty hydraulic filter - Change or clean oil filter.
Suction line is dirty - Suction line must be serviced.
Pump is sucking air - Bleed air from hydraulics.
Damaged pump parts - Rebuild or install new pump.

Electrical Troubleshooting

Battery is not charging
Loose or corroded wire connections - Tighten or service connections.
Battery terminal clamps are faulty - Install new terminal clamps.
Dead cell in battery - Battery replacement required.
Worn or loose belt - Change belt or adjust belt tension.

Starter cranks slowly
Low battery output voltage - Battery is drained, recharge it.
Battery drains quickly - Service charging system or change battery.
Terminals are faulty or battery cables are disconnected - Connect cables correctly or replace terminals.

Starter doesn't crank
Battery is drained or worn - Recharge or replace battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery power is low - Low battery charging, charge as required.
Faulty starter motor - Starter should be replaced.

____________________________________________________________________________________

WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders