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Mustang 1650R Troubleshooting

The Mustang 1650R skid steer loader is powered by 201.5 cu.in (3.3L) Yanmar 4TNV98C-NMS2 4-cylinder vertical in-line direct injection liquid-cooled diesel engine with a rated power of 68.4 hp (51.1 kW) at 2500 rpm. The Mustang 1650R is equipped with a radial-lift loader boom, single or two speed hydrostatic transmission, 80K drive chains, and 10x16.5 HD standard tires. The hydraulic system has a pump with fluid flow rate of 18.9 gpm (71.4 lpm). The skid steer loader has a rated operating capacity of 1650 lbs (748 kg) and tipping load of 3300 lbs (1495 kg). The max lift height is 119 inches (3025 mm) to hinge pin, and dump height is 93.7 inches (2380 mm).

Engine Troubleshooting

Engine starts hard or won't start
Air trapped in fuel system - Bleed air.
Dirty fuel filter - Clean the filter or install new filter element.
Faulty or dirty injection nozzles - If necessary, replace with a new nozzle.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is wrong - Have it adjusted.
Fuel injection pump is damaged - Rebuild or replace pump.

Engine starts and then shuts off
Air filter is plugged - Clean or change.
Clogged fuel filter - Change the filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Fuel injectors are dirty or defective - Replace or clean fuel injectors.
Fuel injection pump malfunction - Install a new pump or rebuild.

Engine stalls while running
Low coolant temperature - Normalize the temperature by warming up the engine.
Clogged fuel filter - Clean or change the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Defective or clogged injection nozzle - Check injection nozzles and replace if required.
Fuel injection pump timing is wrong - Check the fuel injection pump timing adjustment.

Engine stalls at idle
Wrong adjustment of low idle speed - Adjust low idle speed.
Fuel injection pump is not operating properly - Install a new pump or rebuild.
Fuel injectors are faulty or clogged - Clean fuel injectors or change it.
Improper valve clearance - Adjust valve clearance according to specifications.

Engine lacks power
Dirty air cleaner - Clean or change.
Defective injection nozzle - Service or change injection nozzles.
Insufficient fuel injection pressure - Adjust to proper pressure.
Valve out of adjustment - Adjust to proper valve clearance.
Incorrectly set low idle speed - Adjust as required.
Dirt in the fuel lines or hoses - Service fuel hoses and lines.
Cylinder head gasket is blown - Gasket should be replaced.
Damaged or leaking piston rings - Install new piston rings.

Engine overheats
Lack of coolant in cooling system - Refill to the correct level and inspect system for leaks.
Engine oil insufficient - Check oil level and add oil as required.
Clogged radiator fins or leaking radiator cap - Replace cap or clean radiator.
Fan belt is loose or defective - Change as required.
Engine overload - Load reducing required.

Low oil pressure
Low oil level - Check and refill the oil.
Oil filter element clogged - Change or service engine oil filter.
Wrong oil viscosity - Use proper viscosity oil.
Crankshaft bearing has incorrect oil clearance - Change bearings.
Defective oil pump - Check and replace if necessary.

Abnormal engine knocking or noise
Lack of engine oil - Check oil level and add oil as required.
Engine is cold - Normalize the temperature by warming up the engine.
Fuel injection pump timing is not adjusted - Adjust as recommended.
Improperly adjusted low idle speed - Need to adjust idle speed.
Clogged or defective injectors - Clean or replace fuel injectors.
Connecting rod is misaligned or worn - Connecting rod needs to be replaced or aligned.
Pistons are broken or worn - Pistons need to be replaced.

Drive System Troubleshooting

Drive system does not work in either direction
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.
Drive chain malfunction - Inspect drive chain and replace faulty parts.
Relief valve failure - Repair or replace relief valve.
Hydraulic filter or suction line is dirty - Service suction line or replace hydraulic filter.
Hand or foot controls failure - Repair or change.
Drive motor or pump is defective - Replace or repair faulty component.

Lack of power
Hydraulic oil filter is dirty - Check, clean, or replace as required.
Relief valve is opened or defective - Close or replace relief valve.
Transmission components are worn or defective - Inspect and change defective parts.
Input drive shaft malfunction - Rebuild or change the shaft.
Air in the hydraulic system - Need to bleed air.

Overheated drive system
Insufficient hydraulic fluid - Check and refill the hydraulic fluid.
Clogged hydraulic fluid filter - Check, clean, or change as necessary.
Relief valve is worn or damaged - Rebuild or install a new relief valve.
Defective drive pump or hydraulic motor - Check and repair if required.
Dirty oil cooler - Clean cooling fins as required.
Drive system is overloaded - Reduce loading.

Drive system makes excessive noise
Wrong oil viscosity - Drain and refill with proper oil.
Air in hydraulic system - Need to bleed air.
Defective drive pump or hydraulic motor - Check and repair if required.
Worn or defective mechanical parts of drive system - Check drive system and change faulty parts.

Hydraulics Troubleshooting

Hydraulic system has overheating
Hydraulic pressure incorrectly adjusted - Set pressure correctly.
Main relief valve is faulty or misadjusted - Adjust or replace the relief valve.
Hydraulic fluid contamination - Change hydraulic fluid.
Lack of hydraulic oil - Fill the hydraulic system with oil.
Defective hydraulic pump - Repair or replace pump if necessary.

Lift arm fails to drop or lift
Lift controls are faulty - Replace or repair.
Defective hydraulic pump - Repair or replace pump if necessary.
Faulty hydraulic control valve - Install a new hydraulic valve or repair it.
Broken hydraulic cylinder - Repair or install a new lift cylinder.
Hydraulic fluid level low - Add fluid as required.

Bucket can't tilt
Bucket controls are faulty - Repair or replace.
Hydraulic pump not working - Repair or replace pump if necessary.
Hydraulic control valve is defective - Repair or change hydraulic valve.
Damaged bucket cylinder - Change or repair cylinder.
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.

Boom or bucket functions slowly
Hydraulic pump is defective - Check pump flow and change pump if necessary.
Hydraulic cylinder leaking - Correct leakage by changing the seals.
Hydraulic oil is insufficient - Need to add oil.
Hydraulic control valve is defective or set improper - Repair or adjust properly.
Hydraulic pressure loss - Set pressure correctly.

Jerky operation of the bucket or boom
Air in the hydraulic system - Need to bleed air.
Clogged hydraulic oil filter element - Clean or install new filter.
Contaminated hydraulic fluid - The fluid must be changed.
Scored cylinder tube or rod - Change damaged component.

Hydraulic pump is excessively noisy
Low oil level or hydraulic leaks - Repair hydraulic leaks or add oil as required.
Hydraulic filter is dirty - Clean or install new filter.
Clogged suction line - Suction line needs to be cleaned.
Pump is sucking air - Air bleeding is required.
Damaged pump components - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery won’t charge
Wiring connections are corroded or loose - Tighten or service cable connections.
Electrical terminal connectors are defective - Terminal connectors need to be changed.
Dead cell in battery - Battery replacement required.
Belt is loose or defective - Replace belt or adjust belt tension.

Starter cranks slowly
Low battery output voltage - Charge the battery.
Battery won’t hold charge - Service battery or change it.
Battery cables are disconnected or terminals are faulty - Connect wiring correctly or install new terminals.

Starter motor is not working
Battery is low or faulty - Recharge or change battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery output - Battery is drained, charge it.
Starter motor failing - Starter should be changed.