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Bobcat S64 Troubleshooting

The Bobcat S64 skid steer loader is powered by 146.5 cu.in (2.4L) Bobcat Doosan D24 four-cylinder turbocharged diesel engine with a rated power of 68 hp (50.7 kW) at 2600 rpm. The Bobcat S64 is equipped with a single-speed or two-speed hydrostatic transmission, vertical-lift loader boom, 80 HSOC roller chains, and 10x16.5 or 31-12x16.5 tires. The hydraulic system has a pump with fluid flow rate of 17.6 gpm (66.5 lpm). The hydraulic pressure is 3500 psi (241 bar). The skid steer loader has a rated operating capacity of 2300 lbs (1043 kg) and tipping load of 4600 lbs (2086 kg). The lift height is 120" (3050 mm) to hinge pin, and dump height is 94.3" (2395 mm).

Engine Troubleshooting

Engine hard to start or doesn't start
Air in the fuel system - Air bleeding.
Fuel filter element is dirty - Clean the filter element.
Dirty or faulty injection nozzles - Test injection nozzles and change if necessary.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is not correct - Adjust valve clearance according to specifications.
Fuel injection pump malfunction - Rebuild or install a new injection pump.

Diesel starts and stops
Dirty air cleaner - Service or replace air cleaner.
Fuel filter element is dirty - Install new filter element.
Fuel injection pump is leaking - Repair any leaks.
Clogged or defective injectors - Clean fuel injectors or change it.
Fuel injection pump is damaged - Change pump or rebuild it.

Engine stops suddenly during operation
Engine is cold - Warm up engine as required.
Fuel filter is plugged - Replace filter element.
Air in the fuel system - Air bleeding.
Defective or clogged injection nozzle - If necessary, replace with a new nozzle.
Timing of fuel injection pump is incorrect - Adjust as recommended.

Engine stalls at low idle speed
Low idle speed adjustment is incorrect - Adjust low idling as recommended.
Fuel injection pump is faulty - Replace injection pump or repair it.
Clogged or defective injectors - Clean or replace fuel injectors.
Valve out of adjustment - Correct valve clearance.

Engine lacks power
Clogged air filter - Change or service air filter element.
Dirty or faulty injection nozzles - Inspect nozzles and replace if necessary.
Fuel injection pressure is wrong - Test fuel injection pressure and adjust it correctly.
Excessive valve clearance - Correct valve clearance.
Incorrect low idle setting - Adjust low idling as recommended.
Dirt in the fuel lines or hoses - Clean fuel system lines and hoses.
Defective cylinder head gasket - Replace cylinder head gasket.
Leaking or defective piston rings - Replace piston rings.

Engine overheating
Low coolant level - Top up coolant fluid and check system for leaks.
Lack of engine oil - Fill the crankcase with engine oil.
Defective radiator cap or clogged radiator fins - Replace cap or clean radiator.
Broken or loose fan belt - Replace as required.
Diesel engine overloaded - Load reducing is recommended.

Oil pressure is low
Oil level is insufficient - Need to add oil.
Oil filter is clogged - Service or change engine oil filter element.
Different type of engine oil - Use the specified type of engine oil.
Incorrect oil clearance in crankshaft bearing - Bearing needs to be changed.
Oil pump is defective - Check and replace if necessary.

Engine knocking or noise
Lack of engine oil - Fill up the engine oil.
Low coolant temperature - Warm up the engine.
Incorrect adjustment of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Low idle speed setting is incorrect - Adjust low idling as recommended.
Defective fuel injectors - Replace or clean fuel injectors.
Connecting rod is misaligned or defective - Replace or align connecting rod.
Worn or broken pistons - Pistons need to be replaced.

Drive System Troubleshooting

Drive system will not operate in either direction
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.
Drive chain malfunction - Inspect drive chain and replace faulty components.
Input drive shaft is damaged - Replace drive shaft.
Relief valve is worn or damaged - Repair or change.
Dirty hydraulic filter or suction line - Change hydraulic filter or service suction line.
Hand or foot controls malfunction - Inspect and repair if necessary.
Drive pump or motor malfunction - Repair or replace faulty component.

Power is too low
Hydraulic oil filter is clogged - Check, clean, or replace as required.
Opened or worn relief valve - Close or replace relief valve.
Transmission components are faulty or damaged - Inspect and replace faulty parts.
Input drive shaft failure - Faulty drive shaft need to be replaced or repair.
Air trapped in hydraulic system - Bleed hydraulic system.

Drive system keeps overheating
Hydraulic oil is insufficient - Check and refill the hydraulic oil.
Dirty hydraulic fluid filter - Check, clean, or change as necessary.
Relief valve is stuck - Change or repair relief valve.
Worn hydraulic motor or drive pump - Check and repair if required.
Plugged hydraulic oil cooler - Cooling fins need to be cleaned.
Overloaded drive system - Load should be reduced.

Drive system is noisy
Oil viscosity is incorrect - Drain and refill with correct oil.
There is air in the hydraulic system - Bleed hydraulic system.
Damaged drive pump or hydraulic motor - Inspect and change as required.
Mechanical components of drive system are defective or worn - Inspect the parts for worn or defect and repair as needed.

Hydraulics Troubleshooting

Hydraulic system is overheated
Hydraulic pressure is incorrect - Adjust pressure as required.
Faulty or improperly adjusted main relief valve - Adjust the valve or replace if necessary.
Dirty hydraulic fluid - The fluid must be changed.
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required.
Hydraulic pump is worn - Repair or replace pump if necessary.

Boom does not raise or lower
Faulty lift controls - Check and repair as required.
Defective hydraulic pump - Repair or install new hydraulic pump.
Faulty hydraulic control valve - Repair or change the valve.
Defective hydraulic cylinder - Repair or replace hydraulic cylinder.
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.

Bucket is not working
Defective bucket controls - Repair or replace.
Hydraulic pump is broken - Repair or change pump if required.
Hydraulic control valve malfunction - Repair or replace the valve.
Defective bucket cylinder - Change or repair cylinder.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.

Slow bucket or lift arm action
Hydraulic pump is worn - Check hydraulic pump flow and replace pump if necessary.
Leaking hydraulic cylinder - Correct leakage by changing the seals.
Hydraulic oil level low - Check and refill the hydraulic oil.
Hydraulic control valve is faulty or out of adjustment - Repair or adjust properly.
Hydraulic pressure has dropped - Correct setting is required.

Lift arm or bucket is working jerkily
Air in the hydraulic system - Air bleeding is required.
Plugged hydraulic oil filter - Change or clean oil filter.
Hydraulic fluid contamination - Hydraulic fluid change required.
Cylinder tube or rod is scored - Change defective component.

Hydraulic pump is noisy
Insufficient oil level or leaking hydraulic system - Correct hydraulic leaks or top up oil as needed.
Dirty hydraulic filter - Service or replace hydraulic filter.
Dirty suction line - Suction line must be serviced.
Air trapped in hydraulic pump - Bleed air from hydraulics.
Damaged pump components - Rebuild or install new pump.

Electrical Troubleshooting

Battery won’t charge
Electrical wire connections are corroded or loose - Clean or tighten connections.
Battery terminal connectors are faulty - Change terminal connectors.
Battery faulty cell - Battery change required.
Belt is damaged or loose - Belt needs to be adjusted or changed.

Starter turns slow
Low battery power - Charge the battery.
Battery is not holding charge - Battery needs service or replacement.
Disconnected battery cables or bad terminals - Connect wiring correctly or install new terminals.

Starter will not crank
Battery is discharged or defective - Charge or replace the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery power is low - Charge the battery.
Starter motor failure - Starter needs to be changed.