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Mustang 2012 Troubleshooting

The Mustang 2012 skid steer loader driveline system components: a 81.2 cu.in (1.3L) Yanmar 3TNV82 four-cycle three-cylinder direct injection water-cooled diesel engine with a rated power of 24 hp (17.9 kW), and 1-speed hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 10.1 gal/min (38.2 l/min). The system pressure is 2750 psi (190 bar). The Mustang 2012 is equipped with a radial-lift boom, 80K drive chains, and 5.70x12 tires. The skid steer loader has a max lift height of 96" (2440 mm) to hinge pin and dump height of 72.3" (1835 mm). The rated operating capacity is 850 lbs (386 kg), and tipping load is 1700 lbs (772 kg).

Engine Troubleshooting

Engine starts hard or won't start
Air in the fuel lines - Bleed the fuel lines.
Fuel filter plugged - Change the filter element.
Fuel injection nozzles are damaged or dirty - Clean or replace injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Fuel injection pump failure - Repair or change injection pump.

Engine starts and stalls suddenly
Dirty air cleaner - Clean or change cleaner.
Fuel filter element is dirty - Install new filter element.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Damaged or clogged injectors - Clean or replace fuel injectors.
Damaged fuel injection pump - Change or repair the pump.

Engine stops unexpectedly during operation
Engine is not preheated - Warm up engine as required.
Fuel filter element is clogged - Clean or replace the filter.
Air in fuel system - Bleed fuel system.
Faulty fuel injection nozzles - Check injection nozzles and replace if required.
Fuel injection pump timing is wrong - Check the fuel injection pump timing adjustment.

Engine stalls at low idle speed
Low idle speed set incorrectly - Correct the settings.
Fuel injection pump is damaged - Repair or replace injection pump.
Dirty or defective injectors - Clean or replace fuel injectors.
Improper valve clearance - Check and adjust.

Loss of engine power
Plugged air filter - Replace or clean air filter element.
Damaged or dirty injection nozzles - Check and replace nozzles if required.
Incorrect fuel injection pressure - Test fuel injection pressure and adjust it correctly.
Valve out of adjustment - Check and adjust.
Low idle speed adjustment is incorrect - Test and adjust.
Clogged fuel hoses or lines - Clean fuel hoses and lines.
Defective cylinder head gasket - Change cylinder head gasket.
Worn or damaged piston rings - Piston rings need to be replaced.

Engine overheated
Insufficient coolant - Fill radiator to proper level and check components for faults.
Low engine oil level - Checking oil level and add if necessary.
Radiator core is clogged or radiator cap is leaking - Clean radiator or change cap.
Fan belt slipping or worn - Install new fan belt.
Engine overloaded - Reduce engine load.

Oil pressure too low
Engine oil insufficient - Fill the crankcase with oil.
Oil filter element clogging - Clean or replace engine oil filter element.
Different type of engine oil - Use oil of correct viscosity.
Excessive crankshaft bearing oil clearance - Change bearings.
Oil pump failure - Inspect and change as required.

Engine noises or knocks
Engine oil level is insufficient - Check and refill engine oil.
Engine is cold - Warm up engine as required.
Improper setting of fuel injection pump timing - Set up as recommended.
Too low idle RPM - Correct low idle settings.
Damaged or clogged injectors - Replace or clean fuel injectors.
Connecting rod is not aligned or worn - Alignment procedure or replacement is required.
Worn or broken pistons - Replace the pistons as required.

Drive System Troubleshooting

Drive system does not work in either direction
Hydraulic fluid level low - Add fluid as required.
Drive chain is damaged - Check drive chain and change defective components.
Relief valve defective or worn - Change or repair relief valve.
Hydraulic filter or suction line is clogged - Clean suction line or change hydraulic filter.
Faulty foot or hand controls - Repair or replace.
Drive pump or motor malfunction - Replace or repair faulty component.

Lack of power
Hydraulic oil filter is plugged - Check, clean, or change as necessary.
Relief valve is defective or open - Change or close relief valve.
Faulty or damaged transmission components - Inspect and replace defective parts.
Worn input drive shaft - Repair or replace faulty drive shaft.
Air leaks in hydraulic system - Air bleeding is required.

Drive system overheats
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.
Hydraulic fluid filter is plugged - Replace or service hydraulic filter.
Relief valve is stuck - Service or change relief valve.
Drive pump or hydraulic motor is damaged - Repair or change faulty component.
Oil cooler is clogged - Clean cooling fins as required.
Drive system overload - Load needs to be reduced.

Drive system is excessively noisy
Improper oil viscosity - Use oil of correct viscosity.
Air in hydraulic system - Air bleeding is required.
Defective drive pump or hydraulic motor - Inspect and change as required.
Mechanical parts of drive system are defective or worn - Check drive system and change faulty parts.

Hydraulics Troubleshooting

Hydraulic system overheats
Incorrect hydraulic pressure setting - Adjust it correctly.
Unadjusted or defective main relief valve - Adjust the valve or replace if necessary.
Hydraulic fluid contamination - Fill up with fresh hydraulic fluid.
Hydraulic fluid level is low - Add fluid to the hydraulic system.
Defective hydraulic pump - Repair or replace pump if necessary.

Lift arm can't drop or lift
Faulty lift controls - Repair or change.
Hydraulic pump failure - Install new pump or repair it.
Defective hydraulic control valve - Replace or repair the valve.
Defective hydraulic cylinder - Replace or repair boom cylinder.
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.

Bucket fails to tilt
Bucket tilt controls are damaged - Repair or change.
Defective hydraulic pump - Replace or repair pump if necessary.
Hydraulic control valve failure - Replace or repair the valve.
Faulty hydraulic bucket cylinder - Repair or install a new cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Boom or bucket runs slowly
Faulty hydraulic oil pump - Check pump performance and change it if necessary.
Hydraulic cylinder oil leakage - Repair leak by replacing the seals.
Hydraulic fluid is insufficient - Add fluid as required.
Damaged or incorrect adjusted hydraulic control valve - Adjust properly or repair.
Hydraulic pressure is low - Hydraulic pressure must be set correctly.

Bucket or boom is moving jerkily
Hydraulic system is leaking air - Need to bleed air.
Hydraulic oil filter is dirty - Service or replace the hydraulic filter.
Contaminated hydraulic oil - The oil must be changed.
Cylinder tube or rod scoring - Replace defective component.

Hydraulic pump is excessively noisy
Leaking hydraulic system or insufficient oil level - Repair hydraulic leaks or add oil as required.
Clogged hydraulic filter - Clean or replace the filter.
Clogged suction line - Suction line must be serviced.
Air in hydraulic pump - Need to bleed air.
Pump parts are faulty - Replace or rebuild the pump.

Electrical Troubleshooting

Battery does not charge
Corroded or loose wire connections - Tighten or clean connections.
Defective battery terminal clamps - Terminal clamps need to be replaced.
Faulty cell in battery - Replace the battery.
Loose or worn belt - Adjust belt tension or replace belt.

Starter turning slow
Low battery output - Recharge the battery.
Battery is not holding charge - Service charging system or install new battery.
Corroded battery terminals or disconnected wires - Connect wires correctly or change terminals.

Starter is not working
Battery is discharged or worn - Charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery capacity - Low battery charging, charge as required.
Starter motor is damaged - Replace or repair starter.