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Mustang 2056 Troubleshooting

The Mustang 2056 Series 2 skid steer loader driveline system components: a 202.5 cu.in (3.3L) Yanmar 4TNV98 four-cylinder direct injection liquid-cooled diesel engine with a rated power of 68 hp (50.7 kW), and 2-speed hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 19 gal/min (72 l/min) or 30 gal/min (114 l/min). The Mustang 2056 is equipped with a radial-lift loader boom, 100K drive chains, and 12x16.5 HD standard tires. The skid steer loader has a maximum lift height of 121.5" (3085 mm) to hinge pin and dump height of 91.8" (2330 mm). The rated operating capacity is 1900 lbs (862 kg), and tipping load is 3800 lbs (1725 kg).

Engine Troubleshooting

Engine starts hard or doesn't start
There is air in the fuel system - Bleed the system.
Fuel filter plugging - Change filter element.
Clogged or burnt injection nozzle - Clean or replace injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is wrong - Check and adjust.
Fuel injection pump is defective - Install a new pump or rebuild.

Engine starts but stalls immediately
Plugged air cleaner - Clean or change.
Fuel filter plugging - Clean or change the filter.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Defective or clogged fuel injectors - Replace fuel injectors.
Fuel injection pump is broken - Change pump or rebuild it.

Engine stalls during operation
Engine is not fully warmed up - Warm up to required temperature.
Fuel filter is plugged - Clean the filter or install new filter element.
Air trapped in fuel system - Bleed air.
Clogged injection nozzle - If necessary, replace with a new nozzle.
Fuel injection pump timing is not adjusted - Adjust as recommended.

Engine shuts off while idling
Low idle speed set incorrectly - Adjustment required.
Fuel injection pump failure - Replace or rebuild injection pump.
Defective fuel injectors - Replace fuel injectors.
The valve clearance is incorrect - Need to adjust valve clearance.

Low engine power
Air filter is dirty - Clean or change filter.
Clogged or burnt injection nozzle - Clean or replace injection nozzles.
Improper fuel injection pressure - Correct the pressure settings.
Valve clearance is not correct - Adjust valve clearance.
Low idle speed setting is not correct - Adjust as required.
Dirty fuel lines or hoses - Clean fuel hoses and lines.
Cylinder head gasket defective - Gasket should be replaced.
Leaking or defective piston rings - Piston rings replacement required.

Engine overheating
Engine has a lack of coolant - The cooling system needs to be refilled and checked for faults.
Engine oil level is low - Fill up the engine oil.
Dirty radiator core or defective radiator cap - Clean radiator or replace cap.
Damaged or worn fan belt - Fan belt must be replaced.
Diesel engine overloaded - Load reducing required.

Low oil pressure
Oil level is low - Fill the crankcase with oil.
Oil filter clogging - Replace or service engine oil filter.
Oil grade or viscosity is wrong - Fill up with the proper oil viscosity.
Main bearing oil clearance is excessive - Change bearings.
Oil pump failure - Inspect and change as required.

Abnormal engine noise or knocking
Engine oil level is insufficient - Fill up the engine oil.
Engine is not preheated - Normalize the temperature by warming up the engine.
Improper setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Incorrectly adjusted low idle speed - Test and adjust.
Fuel injector fault - Replace or clean fuel injectors.
Misaligned or defective connecting rod - Need to align or replace the connecting rod.
Scored or worn pistons - Replace the pistons as required.

Drive System Troubleshooting

Machine is not moving in one direction or either direction
Hydraulic fluid is insufficient - Add fluid as required.
Drive chain is worn - Check drive chain and change defective components.
Relief valve worn or defective - Change or repair relief valve.
Plugged suction line or hydraulic filter - Clean suction line or replace hydraulic filter.
Faulty foot or hand controls - Repair or change.
Drive motor or pump failure - Inspect and replace as necessary.

Reduced power
Dirty hydraulic oil filter - Replace or clean hydraulic filter.
Relief valve is open or defective - Close or replace relief valve.
Transmission parts are faulty or damaged - Check and replace defective components.
Input drive shaft malfunction - Replace or service the drive shaft.
Hydraulic system is leaking air - Air bleeding is required.

Drive system overheating
Insufficient hydraulic fluid - Add fluid as required.
Hydraulic fluid filter is plugged - Replace hydraulic filter.
Relief valver is broken - Change or repair defective relief valve.
Hydraulic motor or drive pump failure - Check and repair if required.
Hydraulic oil cooler is dirty - Clean the cooling fins.
Drive system overload - Reduce drive system load.

Drive system is noisy
Wrong oil viscosity - Use correct oil viscosity.
Hydraulic system is leaking air - Bleed air from system.
Defective drive pump or hydraulic motor - Change or repair faulty component.
Worn or damaged mechanical components of drive system - Inspect the components for defect or damage and repair as needed.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure incorrectly adjusted - Adjust pressure as required.
Defective or misadjusted main relief valve - Replace or set up the relief valve.
Contaminated hydraulic oil - Change hydraulic oil.
Hydraulic fluid level is low - Fill the hydraulic system with oil.
Faulty hydraulic oil pump - Replace or repair pump if necessary.

Boom does not raise or lower
Defective lift controls - Change or repair.
Damaged hydraulic oil pump - Install new pump or repair it.
Damaged hydraulic control valve - Repair or change the valve.
Hydraulic cylinder is broken - Replace or repair boom cylinder.
Hydraulic fluid level low - Add fluid as required.

Bucket does not tilt
Damaged bucket controls - Replace or repair.
Hydraulic pump failure - Change or repair hydraulic pump if required.
Hydraulic control valve failure - Replace or repair the valve.
Hydraulic bucket cylinder is broken - Change or repair cylinder.
Low hydraulic oil level - Need to add oil.

Bucket or lift arm functions slowly
Defective hydraulic pump - Check pump performance and change it if necessary.
Hydraulic cylinder oil leakage - Change cylinder piston seals.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.
Hydraulic control valve is faulty or out of adjustment - Set properly or repair.
Hydraulic pressure loss - Adjust it correctly.

Lift arm or bucket movements are jerky
Air in hydraulic system - Need to bleed air.
Plugged hydraulic oil filter - Clean or replace the filter.
Hydraulic fluid contamination - The fluid must be changed.
Scored cylinder tube or rod - Replace damaged component.

Hydraulic pump makes excessive noise
Low oil level or hydraulic leaks - Correct hydraulic leaks or top up oil as needed.
Dirty hydraulic filter - Clean or replace the filter.
Dirty suction line - Need to clean the suction line.
Air enters the pump - Remove air from hydraulics.
Pump components are damaged - Rebuild or install new pump.

Electrical Troubleshooting

Battery will not charge
Corroded or loose electrical wire connections - Tighten or service connections.
Defective battery terminal connectors - Terminal connectors need to be changed.
Bad cell in battery - Battery replacement required.
Loose or worn belt - Belt needs to be adjusted or replaced.

Starter motor cranks slow
Low battery output - Low battery charging, charge as required.
Battery will not hold charge - Battery needs to be serviced or replaced.
Bad terminals or disconnected battery cables - Connect wiring properly or install new terminals.

Starter is not cranking
Battery is low or faulty - Recharge or change battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery power - Low battery charging, charge as required.
Defective starter motor - Change or repair starter.