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Home / Wheel Loaders / Bobcat Wheel Loaders / Bobcat L75

Bobcat L75 Troubleshooting

The Bobcat L75 compact wheel loader driveline system components: a 146.5 cu.in (2.4L) Bobcat Doosan D24 four-cylinder direct injection turbocharged diesel engine with a rated power of 55 hp (41 kW), and hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 19.9 gal/min (75.4 l/min). The system relief pressure is 2975 psi (205 bar). The Bobcat L75 is equipped with a power steering system, wet disc brakes, and 365/70R18 tires. The compact wheel loader has a max lift height of 127" (3225 mm) and breakout force of 8850 lbs (4023 kg). The rated operating capacity is 2820 lbs (1282 kg), and tipping load is 5640 lbs (2564 kg).

Engine Troubleshooting

Engine starts up hard or will not start
Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter element is dirty - Clean or change the filter.
Dirty or damaged injection nozzles - Replace injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Incorrect valve clearance - Adjust to proper valve clearance.
Damaged fuel injection pump - Change pump or rebuild it.

Engine starts and immediately shuts off
Air cleaner is dirty - Clean or replace air cleaner element.
Fuel filter plugged - Change the filter element.
Fuel injection pump is leaking - Repair any leaks.
Dirty or defective injectors - Replace fuel injectors.
Fuel injection pump is broken - Install a new fuel pump or repair.

Engine stops suddenly during operation
Engine not warmed up - Normalize the temperature by warming up the engine.
Fuel filter element clogging - Service or replace the filter.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are damaged or dirty - Replace injection nozzles.
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.

Engine stops while idle
Low idle speed setting is incorrect - Correct low idle settings.
Fuel injection pump is damaged - Replacement or repair required.
Damaged or clogged injectors - Clean fuel injectors or change it.
Valve clearance is not correct - Correct valve clearance.

Engine power is too low
Dirty air cleaner - Clean or replace element.
Fuel injection nozzles fault - Replace injection nozzles.
Incorrect fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
Incorrect valve clearance - Have it adjusted.
Too low idle RPM - Correct low idle adjustment.
Dirty fuel hoses or lines - Service fuel lines and hoses.
Cylinder head gasket is defective - Change cylinder head gasket.
Piston rings are worn or defective - Change piston rings.

Engine overheating
Lack of engine coolant - Add coolant and check the components of cooling system.
Not enough engine oil - Fill the crankcase with engine oil.
Defective radiator cap or clogged radiator core - Clean radiator or install new cap.
Loose or defective fan belt - Change as required.
Engine is overloaded - Load reducing required.

Oil pressure is insufficient
Engine oil level low - Add oil as required.
Oil filter is clogged - Clean or change engine oil filter.
Incorrect engine oil Use proper viscosity oil.
Excessive main bearing oil clearance - Change bearings.
Oil pump is defective - Inspect and change as required.

Engine knocking sound or abnormal noise
Engine oil level low - Fill up the oil to required level.
Engine is not fully warmed up - Warm up engine as required.
Incorrect adjustment of fuel injection pump timing - Adjust fuel injection pump as required.
Incorrect low idle speed adjustment - Correct the settings.
Damaged or clogged injectors - Test and replace fuel injectors if necessary.
Connecting rod is not aligned or worn - Connecting rod needs to be aligned or changed.
Pistons are broken or worn - Have pistons replaced.

Hydrostatic Transmission Troubleshooting

HST transmission noises
Transmission oil is contaminated or oil level is insufficient - Change transmission oil or top up to proper level.
Speed control pedal linkage is bent or not adjusted - Adjust or install new linkage.
Relief valve failure - Install a new valve.
Transmission overloaded - Reduce the load is required.
Transmission parts are worm or defective - After disassembly and inspection, replace defective components.

Loss of power
Low fluid level - Need to add transmission fluid.
Relief valve malfunction - Install a new valve.
Speed control pedal linkage is bent or not adjusted - Replace or adjust linkage.

Transmission oil over heats
Transmission fluid insufficient - Add fluid to the transmission housing.
Dirty transmission fluid filter - Service or replace the transmission fluid filter.
Defective or plugged cooling components - Check all cooling components and clean or replace if required.
Transmission is under excessive load - Reduce transmission load.

Transmission fluid leaking
Broken seals or gaskets - Gaskets or seal replacement required.
High internal transmission case pressure - Replace worn components.
Clogged transmission fluid return pipe - Clean or change return pipe.

Hydraulics Troubleshooting

Hydraulic system is overheated
Hydraulic pressure is not correct - Set pressure correctly.
Main relief valve is defective or unadjusted - Replace or set up the relief valve.
Hydraulic oil is contaminated - Hydraulic oil change required.
Hydraulic fluid level is insufficient - Add fluid to the hydraulic system.
Hydraulic pump is faulty - Replace or repair pump if necessary.

Lift arm can't drop or lift
Lift controls are faulty - Replace or repair.
Hydraulic pump not working - Change or repair hydraulic pump if required.
Defective hydraulic control valve - Install a new hydraulic valve or repair it.
Hydraulic cylinder is faulty - Repair or install a new lift cylinder.
Insufficient hydraulic oil - Need to add oil.

Bucket fails to tilt
Bucket controls failure - Replace or repair.
Hydraulic pump malfunction - Repair or change pump if required.
Hydraulic control valve is defective - Repair or replace hydraulic valve.
Bucket cylinder malfunction - Repair or replace cylinder.
Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.

Bucket or lift arm moves slowly
Hydraulic pump is faulty - Check hydraulic pump flow and replace pump if necessary.
Hydraulic cylinder leaking - Install new cylinder seals.
Hydraulic fluid is insufficient - Fill the system to proper hydraulic fluid level.
Hydraulic control valve is unadjusted or worn - Set correctly or repair.
Low hydraulic pressure - Correct setting is required.

Bucket or boom movements are jerky
Air trapped in hydraulic system - Bleed air from system.
Hydraulic oil filter clogging - Service or replace the hydraulic filter.
Hydraulic oil is dirty - Hydraulic oil change required.
Cylinder tube or rod scoring - Replace worn component.

Hydraulic pump is excessively noisy
Leaking hydraulic system or insufficient oil level - Correct hydraulic leaks or top up oil as needed.
Clogged hydraulic filter - Change or clean oil filter.
Suction line is dirty - Clean suction line as required.
Air trapped in hydraulic pump - Air bleeding is required.
Pump parts are worn out - Install new hydraulic pump or rebuild it.

Electrical Troubleshooting

Battery is not charging
Loose or corroded cable connections - Tighten or service connections.
Battery terminal connectors are defective - Replace terminal connectors.
Battery is worn - Use a new battery.
Loose or damaged belt - Change belt or adjust belt tension.

Starter turns slowly
Low battery voltage - Battery needs to be recharged.
Battery is not holding charge - Service charging system or replace battery.
Battery terminals are corroded or wires are disconnected - Connect wiring properly or install new terminals.

Starter motor won't turn
Battery is low or faulty - Change or recharge battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery capacity - Battery is drained, recharge it.
Starter motor is faulty - Repair or replace starter.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders