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Mustang 2054 Troubleshooting

The Mustang 2054 skid steer loader is powered by Yanmar 4TNV88 four-cylinder vertical in-line naturally aspirated liquid-cooled diesel engine with a rated power of 47 hp (34.2 kW) at 2600 rpm. The Mustang 2054 is equipped with a radial-lift loader boom, one-speed hydrostatic transmission, 80K drive chains, and 10x16.5 HD standard tires. The hydraulic system has a pump with fluid flow rate of 18 gpm (68.1 lpm) or 28 gpm (106 lpm). The hydraulic pressure is 2855 psi (197 bar). The skid steer has a rated operating capacity of 1650 lbs (748 kg) and tipping load of 3300 lbs (1500 kg). The max lift height is 116" (2945 mm) to hinge pin, and dump height is 91.9" (2335 mm).

Engine Troubleshooting

Diesel engine hard to start or doesn't start
There is air in the fuel system - Bleed the system.
Fuel filter plugging - Install new filter element.
Faulty or dirty injection nozzles - Service or change injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is out of adjustment - Check and adjust as required.
Fuel injection pump malfunction - Repair or replace injection pump.

Diesel starts but then stops
Air cleaner is clogged - Clean or change cleaner.
Fuel filter element clogging - Clean or change the filter.
Fuel injection pump has loose connections - Tighten the connections.
Defective or clogged fuel injectors - Inspect fuel injectors and change as required.
Fuel injection pump malfunction - Replacement or repair required.

Engine stops unexpectedly during operation
Low coolant temperature - Warm up engine as required.
Dirty fuel filter - Change the filter element.
Air in the fuel system - Air bleeding.
Clogged injection nozzle - If necessary, replace with a new nozzle.
Timing of fuel injection pump is incorrect - Adjust the pump as required.

Engine stalls when idling
Improperly adjusted low idle speed - Adjustment required.
Fuel injection pump failure - Repair or install a new fuel pump.
Damaged or clogged injectors - Change or clean fuel injectors.
Valve out of adjustment - Have it adjusted.

Engine power is insufficient
Air filter is dirty - Service or replace the air filter.
Damaged or dirty injection nozzles - Replace injection nozzles.
Incorrect fuel injection pressure - Correct the pressure settings.
The valve clearance is not adjusted - Adjustment procedure required.
Too low idle RPM - Correct the settings.
Fuel hoses or lines are dirty - Clean fuel lines and hoses.
Leaking cylinder head gasket - Install a new gasket.
Piston rings are worn or damaged - Change piston rings.

Engine overheats
Engine has a lack of coolant - Top up coolant fluid and check system for leaks.
Not enough engine oil - Fill up the oil to required level.
Faulty radiator cap or dirty radiator fins - Replace cap or clean radiator.
Fan belt is loose or defective - Change the fan belt.
Engine overloaded - Load reducing is recommended.

Low oil pressure
Low oil level - Fill crankcase to proper oil level.
Oil filter element is dirty - Replace or service engine oil filter.
Incorrect engine oil Drain and refill with oil of correct grade and viscosity.
Crankshaft bearing has incorrect oil clearance - Install new bearings.
Oil pump is damaged - Inspect and change as required.

Abnormal engine noise or knocking
Lack of engine oil - Checking oil level and add if necessary.
Engine has not warmed up to the recommended temperature - Normalize the temperature by warming up the engine.
Improper fuel injection timing - Adjust according to specifications.
Low idle speed set incorrectly - Adjustment required.
Dirty or defective injectors - Inspect fuel injectors and change as required.
Connecting rod is defective or not aligned - Need to change or align the connecting rod.
Piston wear or scoring - Replace the pistons as required.

Drive System Troubleshooting

Drive system сan't work in either direction
Hydraulic oil level is low - Fill the system to proper hydraulic oil level.
Drive chain failure - Inspect drive chain and replace defective components.
Worn or defective relief valve - Repair or replace relief valve.
Plugged hydraulic filter or suction line - Check, clean, or replace if required.
Faulty foot or hand controls - Inspect and repair if necessary.
Drive pump or motor malfunction - Repair or replace faulty component.

Reduced power
Hydraulic oil filter is plugged - Replace hydraulic filter.
Relief valve is damaged or open - Close or change relief valve.
Faulty or damaged transmission components - Check and replace faulty components.
Defective input drive shaft - Repair or replace drive shaft.
Air in the hydraulic system - Bleed air from system.

Drive system overheating
Insufficient hydraulic oil - Need to add oil.
Clogged hydraulic fluid filter - Replace or clean hydraulic filter.
Defective relief valve - Rebuild or install a new relief valve.
Defective drive pump or hydraulic motor - Change or repair faulty component.
Oil cooler is clogged - Clean cooling fins as required.
Drive system overloaded continuously - Load should be reduced.

Drive system makes excessive noise
Oil viscosity is too heavy - Drain and refill with proper oil.
Air in hydraulic system - Bleed air from hydraulic system.
Worn hydraulic motor or drive pump - Inspect and replace as necessary.
Mechanical components of drive system are damaged or worn - Check the parts for defect or damage and change if required.

Hydraulics Troubleshooting

Hydraulic system overheated
Incorrect hydraulic pressure setting - Adjust pressure as required.
Main relief valve is defective or unadjusted - Set up or change the relief valve.
Hydraulic fluid contamination - Hydraulic fluid change required.
Hydraulic oil level is low - Fill the hydraulic system with oil.
Hydraulic pump is defective - Change or repair hydraulic pump if required.

Boom can't lift or drop
Faulty lift controls - Repair or replace.
Hydraulic pump malfunction - Replace or repair pump if necessary.
Faulty hydraulic control valve - Repair or change the valve.
Hydraulic cylinder is broken - Change or repair lift cylinder.
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.

Bucket won't move
Bucket controls are faulty - Inspect and repair if necessary.
Hydraulic pump failure - Repair or replace pump if necessary.
Defective hydraulic control valve - Repair or replace the valve.
Defective bucket cylinder - Repair or change cylinder.
Hydraulic oil level low - Need to add oil.

Bucket or lift arm functions slowly
Hydraulic pump is worn - Check pump flow and install new pump if necessary.
Hydraulic cylinder oil leakage - Repair leak by replacing the seals.
Low hydraulic fluid level - Add fluid as required.
Damaged or incorrect adjusted hydraulic control valve - Adjust correctly or repair.
Hydraulic pressure is low - Correct setting is required.

Lift arm or bucket jerks when working
There is air in the hydraulic system - Bleed hydraulic system.
Dirty hydraulic oil filter element - Change or clean oil filter.
Dirty hydraulic oil - Change hydraulic oil.
Cylinder rod or tube is scratched - Replace defective component.

Hydraulic pump makes excessive noise
Insufficient oil level or leaking hydraulic system - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter is dirty - Service or change hydraulic filter.
Plugged suction line - Clean suction line as required.
Pump is sucking air - Remove air from hydraulics.
Pump components are worn out - Rebuild or install new pump.

Electrical Troubleshooting

Battery is not charging
Loose or corroded wire connections - Tighten or service cable connections.
Faulty battery terminal connectors - Terminal connectors should be replaced.
Battery bad cell - Change the battery.
Worn or loose belt - Adjust belt tension or install a new belt.

Starter turns slowly
Low battery output - Recharge the battery.
Battery does not hold charge - Service charging system or change battery.
Faulty battery terminals or disconnected cables - Check cable connections and replace or service 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 output voltage - Recharge the battery.
Starter motor is defective - Repair or install a new starter.