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Mustang 2026 Troubleshooting

The Mustang 2026 skid steer loader is powered by 100.2 cu.in (1.6L) Yanmar 3TNV88 4-cycle 3-cylinder direct injection naturally aspirated liquid-cooled diesel engine with a rated power of 35 hp (26 kW) at 2800 rpm. The Mustang 2026 is equipped with a radial-lift loader boom, single-speed hydrostatic transmission, 80K drive chains, and 27x8.5x15 HD standard tires. The hydraulic system has a pump with fluid flow rate of 14.5 gpm (55 lpm). The skid steer loader has a rated operating capacity of 1050 lbs (476 kg) and tipping load of 2100 lbs (953 kg). The lift height is 108.1 inches (2745 mm) to hinge pin, and dump height is 84.5 inches (2145 mm).

Engine Troubleshooting

Engine starts up hard or will not start
Air in the fuel system - Air bleeding.
Dirty fuel filter - Change the filter element.
Clogged or burnt injection nozzle - Inspect nozzles and replace if necessary.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is wrong - Adjust valve clearance.
Fuel injection pump malfunctioning - Replace or repair injection pump.

Diesel starts but then stops
Dirty air filter - Service or replace the air filter.
Dirty fuel filter - Replace the filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Dirty or defective injectors - Change or clean fuel injectors.
Damaged fuel injection pump - Rebuild or replace pump.

Engine stops suddenly during operation
Engine not warmed up - Engine is not warmed up to the required temperature.
Fuel filter element is clogged - Clean or change the filter.
There is air in the fuel system - Bleed the system.
Faulty or dirty injection nozzles - Service or change injection nozzles.
Improper setting of fuel injection pump timing - Adjust the pump as required.

Engine stops at low idle speed
Low idle speed setting is not correct - Adjust low idling as recommended.
Defective fuel injection pump - Rebuild or change fuel pump.
Clogged or defective injectors - Replace fuel injectors.
Valve clearance is not correct - Have it adjusted.

Engine lacks power
Air cleaner is clogged - Clean or replace air cleaner element.
Clogged or burnt injection nozzle - Clean or change injection nozzles.
Uneven fuel injection pressure - Test fuel injection pressure and adjust it correctly.
Excessive valve clearance - Adjust valve clearance.
Too low idle RPM - Test and adjust.
Fuel hoses or lines are dirty - Fuel lines and hoses need to be cleaned.
Damaged cylinder-head gasket - Install new cylinder head gasket.
Piston rings are worn or defective - Piston rings need to be replaced.

Engine overheats
Lack of coolant in cooling system - Add coolant fluid to cooling system and also check it for leaks.
Engine oil insufficient - Add oil to the engine crankcase.
Defective radiator cap or clogged radiator core - Clean radiator or install new cap.
Broken or loose fan belt - Fan belt must be replaced.
Engine is under excessive load - Reduce engine load.

Low oil pressure
Engine oil insufficient - Check oil level and add oil as required.
Plugged engine oil filter - Replace or service engine oil filter.
Incorrect oil viscosity - Use the specified type of engine oil.
Incorrect crankshaft bearing oil clearance - Bearing needs to be changed.
Defective oil pump - Check and replace if necessary.

Engine knocking or noise
Low engine oil level - Add oil to the engine crankcase.
Engine is not preheated - Normalize the temperature by warming up the engine.
Fuel injection pump timing is not adjusted - Adjust according to specifications.
Low idle speed setting is incorrect - Adjust low idle speed.
Fuel injector fault - Change or clean fuel injectors.
Connecting rod is misaligned or defective - Connecting rod needs to be aligned or changed.
Scored or worn pistons - Replace the pistons.

Drive System Troubleshooting

Machine will not move in either direction or one direction
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.
Worn drive chain - Check drive chain and change defective parts.
Relief valve defective or worn - Change or repair defective relief valve.
Dirty hydraulic filter or suction line - Replace hydraulic filter or clean suction line.
Hand or foot controls failure - Check and repair as required.
Worn drive motor or pump - Inspect and replace as necessary.

Loss of power
Clogged hydraulic oil filter - Replace hydraulic filter.
Faulty or opened relief valve - Change or close relief valve.
Transmission components are worn or defective - Check and replace defective components.
Input drive shaft is worn - Change or repair faulty drive shaft.
Air in the hydraulic system - Need to bleed air.

Drive system keeps overheating
Hydraulic oil level is low - Fill the system to proper hydraulic oil level.
Hydraulic fluid filter is dirty - Replace or service hydraulic filter.
Worn or defective relief valve - Repair or replace.
Damaged drive pump or hydraulic motor - Replace or repair faulty component.
Dirty oil cooler - Clean cooling fins as required.
Overloaded drive system - Load needs to be reduced.

Drive system is excessively noisy
Wrong oil viscosity - Use the specified type of oil.
Air trapped in hydraulic system - Bleed air from hydraulic system.
Worn hydraulic motor or drive pump - Repair or replace faulty component.
Mechanical components of drive system are worn or damaged - Check the parts for defect or damage and change if required.

Hydraulics Troubleshooting

Hydraulic system has overheating
Hydraulic pressure is not correct - Adjust it correctly.
Main relief valve is damaged or adjusted improperly - Replace or set up the relief valve.
Hydraulic fluid contamination - Fill up with fresh hydraulic fluid.
Hydraulic fluid level is insufficient - Fill the hydraulic system with oil.
Defective hydraulic pump - Repair or replace pump if necessary.

Boom fails to lift or drop
Damaged lift controls - Check and repair as required.
Hydraulic pump not working - Repair or replace pump if necessary.
Defective hydraulic control valve - Install a new valve or repair it.
Hydraulic cylinder is broken - Repair or change hydraulic cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Bucket does not tilt
Defective bucket controls - Repair or replace.
Damaged hydraulic oil pump - Replace or repair pump if necessary.
Damaged hydraulic control valve - Repair or replace hydraulic valve.
Hydraulic bucket cylinder not working - Change or repair cylinder.
Insufficient hydraulic oil - Check and refill the hydraulic oil.

Slow boom or bucket operation
Hydraulic pump is faulty - Check the pump performance and replace it if required.
Leaking hydraulic cylinder - Replace cylinder piston seals.
Hydraulic oil level low - Fill the system to proper hydraulic oil level.
Worn or unadjusted hydraulic control valve - Repair or set properly.
Hydraulic pressure is low - Correct adjustment is required.

Bucket or boom jerks when working
There is air in the hydraulic system - Need to bleed air.
Hydraulic oil filter is dirty - Change or clean oil filter.
Contaminated hydraulic fluid - Fill up with fresh hydraulic fluid.
Cylinder rod or tube is scratched - Change failed component.

Hydraulic pump is excessively noisy
Low oil level or hydraulic leaks - Repair hydraulic leaks or add oil as required.
Hydraulic filter clogging - Clean or change the filter.
Dirty suction line - Suction line needs to be cleaned.
Air trapped in hydraulic pump - Remove air from hydraulics.
Worn pump components - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery cannot be charged
Loose or corroded cable connections - Tighten or service connections.
Faulty battery terminal clamps - Change terminal clamps.
Battery is worn - Change the battery.
Belt is loose or defective - Install a new belt or adjust belt tension.

Starter turning slow
Low battery voltage - Recharge the battery.
Battery runs out quickly - Service or replace the battery.
Disconnected wiring or bad battery terminals - Check cable connections and replace or service terminals.

Starter motor is not working
Battery is low or faulty - Recharge or change battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery voltage is low - Battery is drained, charge it.
Starter motor is damaged - Starter needs to be changed.