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Bobcat L65 Troubleshooting

The Bobcat L65 compact wheel loader is powered by 146.5 cu.in (2.4L) Bobcat Doosan D24 V2 four-cylinder turbocharged liquid-cooled diesel engine with a rated power of 55 hp (41 kW) at 2600 rpm. The Bobcat L65 is equipped with a hydrostatic transmission, power steering system, wet disc brakes, and 365/70R18 standard tires. The hydraulic system has a gear pump with fluid flow rate of 19.8 gpm (74.9 lpm). The hydraulic pressure is 2975 psi (205 bar). The wheel loader has a rated operating capacity of 2618 lbs (1187 kg) and tipping load of 5236 lbs (2374 kg). The maximum lift height is 126.9" (3255 mm) to hinge pin, and dumping height is 96" (2435 mm).

Engine Troubleshooting

Engine starts hard or will not start
Air in fuel system - Bleed fuel system.
Fuel filter element clogging - Replace the filter element.
Fuel injection nozzles are faulty or clogged - Test injection nozzles and change if necessary.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Fuel injection pump is faulty - Replace injection pump or repair it.

Engine starts and stops suddenly
Dirty air cleaner - Clean or replace element.
Fuel filter element is dirty - Replace filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Clogged or defective injectors - Inspect fuel injectors and change as required.
Fuel injection pump is not operating properly - Replace or repair injection pump.

Engine shuts off suddenly while running
Engine is not fully warmed up - Warm up engine as required.
Dirty fuel filter - Change the filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are clogged or faulty - Check injection nozzles and replace if required.
Improper fuel injection timing - Adjust as recommended.

Engine shuts off while idling
Incorrect low idle speed adjustment - Normalize low idle speed.
Fuel injection pump malfunction - Rebuild or replace pump.
Defective fuel injectors - Clean or replace fuel injectors.
Incorrect valve clearance - Adjust to proper valve clearance.

Loss of engine power
Air cleaner is dirty - Service or replace air cleaner.
Defective injection nozzle - Change fuel injection nozzles.
Fuel injection pressure is wrong - Adjust pressure to proper level.
Valve clearance is out of adjustment - Adjustment procedure required.
Low idle speed setting is not correct - Test and adjust.
Fuel hoses or lines clogging - Clean fuel hoses and lines.
Blown cylinder head gasket - Gasket should be replaced.
Piston rings are broken or leaking - Install new piston rings.

Engine overheats
Engine has a lack of coolant - Fill radiator to proper level and check components for faults.
Insufficient engine oil - Add oil to the engine crankcase.
Dirty radiator fins or defective radiator cap - Replace cap or clean radiator.
Loose or damaged fan belt - Install new fan belt.
Engine overloaded - Load reducing is recommended.

Insufficient oil pressure
Lack of oil - Check and refill the oil.
Oil filter clogging - Service or change engine oil filter element.
Improper type of engine oil - Use oil of proper viscosity.
Excessive oil clearance of crankshaft bearing - Change bearings.
Oil pump malfunction - Install a new pump.

Engine noise or knocking
Engine oil level is insufficient - Fill up the engine oil.
Low coolant temperature - Warm up to required temperature.
Timing of fuel injection pump is incorrect - Adjust the pump as required.
Low idle speed setting is not correct - Adjust as required.
Clogged or defective injectors - Replace fuel injectors.
Connecting rod is defective or misaligned - Alignment procedure or replacement is required.
Pistons are worn or scored - Replace the pistons as required.

Hydrostatic Transmission Troubleshooting

Hydrostatic transmission makes excessive noise
Insufficient oil level or contaminated oil - Add oil to proper level or pour fresh transmission oil.
Speed control linkage is worn or unadjusted - Adjust or repair linkage.
Defective relief valve - Replace relief valve as required.
Transmission is under excessive load - Reduce transmission load.
Transmission parts are worm or defective - After disassembling and inspection, change defective components.

Loss of power
Lack of transmission oil supply - Fill up the transmission oil.
Relief valve is damaged - Change relief valve.
Speed control pedal linkage is damaged or out of adjustment - Adjust or replace linkage.

Hot transmission oil
Transmission oil level is low - Need to add transmission oil.
Clogged transmission oil filter element - Clean or change transmission oil filter.
Plugged or defective cooling components - Check all cooling components and change or clean if required.
Transmission overload - The load should be reduced.

Transmission fluid leakage
Broken seals or gaskets - Seals and gaskets replacement required.
Internal transmission housing pressure is too high - Replace worn components.
Clogged transmission fluid return tube - Clean or replace return tube.

Hydraulics Troubleshooting

Hydraulic system overheated
Incorrect hydraulic pressure setting - Adjust pressure as required.
Faulty or improperly adjusted main relief valve - Adjust relief valve or change if required.
Hydraulic fluid is contaminated - The fluid must be changed.
Lack of hydraulic fluid - Need to add fluid.
Defective hydraulic pump - Change or repair hydraulic pump if required.

Lift arm won't raise or lower
Lift controls are defective - Repair or change.
Defective hydraulic pump - Change or repair hydraulic pump if required.
Hydraulic control valve failure - Install a new valve or repair it.
Hydraulic cylinder is defective - Change or repair lift cylinder.
Hydraulic oil is insufficient - Check and refill the hydraulic oil.

Bucket won't move
Damaged bucket controls - Change or repair.
Hydraulic pump malfunction - Repair or replace pump if necessary.
Faulty hydraulic control valve - Install a new valve or repair it.
Faulty hydraulic bucket cylinder - Repair or replace cylinder.
Insufficient hydraulic oil - Need to add oil.

Boom or bucket is working slowly
Hydraulic pump is faulty - Test the pump flow rate and install new pump if required.
Oil leaks from hydraulic cylinder - Correct leakage by changing the seals.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.
Hydraulic control valve is not set properly or defective - Repair or adjust properly.
Hydraulic pressure loss - Set pressure correctly.

Jerky operation of the bucket or boom
There is air in the hydraulic system - Air bleeding is required.
Dirty hydraulic oil filter - Replace or clean the filter.
Dirty hydraulic oil - Fill up with fresh hydraulic oil.
Scored cylinder tube or rod - Change defective component.

Hydraulic pump makes excessive noise
Not enough oil or hydraulic system leaking - Add hydraulic oil or correct system leaks.
Hydraulic filter is dirty - Service or replace hydraulic filter.
Suction line is clogged - Need to clean the suction line.
Air in hydraulic pump - Need to bleed air.
Pump components are damaged - Install new hydraulic pump or rebuild it.

Electrical Troubleshooting

Battery cannot be charged
Corroded or loose cable connections - Clean or tighten wiring connections.
Defective battery terminal connectors - Change terminal connectors.
Battery bad cell - Change the battery.
Loose or defective belt - Install a new belt or adjust belt tension.

Starter turning slow
Battery voltage is low - Charge the battery.
Battery discharges quickly - Battery needs to be serviced or replaced.
Terminals are faulty or battery cables are disconnected - Check battery wires and service or replace terminals.

Starter is not cranking
Battery is discharged or worn - Replace or charge as required.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery voltage - Battery is drained, recharge it.
Starter motor is damaged - Starter should be changed.