Home / Skid Steer Loaders / Mustang Skid Steer Loaders / Mustang 1350R

Mustang 1350R Troubleshooting

The Mustang 1350R skid steer loader is powered by 133.6 cu.in (2.2L) Yanmar 4TNV88C-KMS 4-cycle 4-cylinder vertical in-line direct injection water-cooled diesel engine with a rated power of 44.5 hp (33 kW) at 2800 rpm. The Mustang 1350R is equipped with a radial-lift loader boom, single-speed hydrostatic transmission, 80K drive chains, and 10x16.5 HD standard tires. The hydraulic system has a pump with fluid flow rate of 17 gpm (64.4 lpm). The skid steer loader has a rated operating capacity of 1350 lbs (612 kg) and tipping load of 2700 lbs (1225 kg). The max lift height is 109.6 inches (2785 mm) to hinge pin, and dump height is 82.6 inches (2100 mm).

Engine Troubleshooting

Engine hard to start or won't start
Air trapped in fuel system - Bleed air.
Fuel filter element clogging - Install new filter element.
Faulty or dirty injection nozzles - Inspect nozzles and replace if necessary.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Improper valve clearance - Correct valve clearance needs to be set.
Fuel injection pump is defective - Rebuild or change fuel pump.

Diesel starts and suddenly stops
Air filter is clogged - Clean or change.
Fuel filter element clogging - Change or clean the filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Fuel injectors are faulty or clogged - Test and replace fuel injectors if necessary.
Fuel injection pump damage - Install a new fuel pump or repair.

Engine shuts off suddenly while running
Engine not warmed up - Warm up to required temperature.
Clogged fuel filter - Service or replace the filter.
There is air in the fuel system - Bleed the system.
Defective injection nozzle - Inspect nozzles and replace if necessary.
Fuel injection pump timing is not adjusted - Set the fuel pump timing correctly.

Engine stalls at idle
Incorrectly adjusted low idle speed - Correct low idle settings.
Damaged fuel injection pump - Change or repair the pump.
Fuel injectors are dirty or defective - Change or clean fuel injectors.
Valve clearance is wrong - Check and adjust as required.

Engine lacks power
Air cleaner is clogged - Clean or change cleaner.
Clogged injection nozzle - Replace injection nozzles.
Insufficient fuel injection pressure - Correct the pressure settings.
Valve clearance is out of adjustment - Check and adjust.
Improperly adjusted low idle speed - Normalize low idle speed.
Fuel hoses or lines are clogged - Clean fuel system hoses and lines.
Cylinder head gasket is defective - Cylinder-head gasket replacement required.
Worn or damaged piston rings - Replace piston rings.

Engine is overheated
Engine coolant is insufficient - Add coolant fluid to cooling system and also check it for leaks.
Low engine oil level - Checking oil level and add if necessary.
Defective radiator cap or clogged radiator fins - Clean radiator or replace cap.
Fan belt is loose or defective - Change the fan belt.
Diesel engine is overloaded - Reduce engine load.

Oil pressure too low
Oil level is insufficient - Add oil as required.
Oil filter is clogged - Change or clean engine oil filter element.
Different type of engine oil - Drain and refill with oil of correct grade and viscosity.
Excessive main bearing oil clearance - Change bearings.
Worn oil pump - Repair or replace.

Engine knocking sound or abnormal noise
Low engine oil level - Check oil level and add oil as required.
Low coolant temperature - Engine is not warmed up to the required temperature.
Fuel injection pump timing is not adjusted - Adjust according to specifications.
Improperly adjusted low idle speed - Correct low idle settings.
Damaged or clogged injectors - Test and replace fuel injectors if necessary.
Connecting rod is worn or misaligned - Need to replace or align the connecting rod.
Pistons are scored or worn - Replace the pistons as required.

Drive System Troubleshooting

Machine is not moving in one direction or either direction
Low hydraulic oil level - Fill the system to proper hydraulic oil level.
Faulty drive chain - Inspect drive chain and replace defective components.
Relief valve is damaged - Rebuild or install a new relief valve.
Clogged hydraulic filter or suction line - Check, clean, or replace if required.
Foot or hand controls are defective - Replace or repair.
Drive pump or motor is damaged - Inspect and replace as necessary.

Power is too low
Dirty hydraulic oil filter - Change or clean hydraulic filter.
Open or damaged relief valve - Close or replace relief valve.
Transmission parts are faulty or damaged - Inspect and change faulty parts.
Input drive shaft is stuck - Service or change faulty drive shaft.
Air in the hydraulic system - Bleed hydraulic system.

Drive system overheating
Low hydraulic oil level - Check and refill the hydraulic oil.
Clogged hydraulic fluid filter - Change hydraulic filter.
Relief valver is broken - Repair or change.
Worn hydraulic motor or drive pump - Inspect and change as required.
Oil cooler is clogged - Cooling fins should be cleaned.
Drive system overloaded continuously - Load needs to be reduced.

Excessive noise
Improper oil viscosity - Use oil of correct viscosity.
Air trapped in hydraulic system - Air bleeding is required.
Hydraulic motor or drive pump is defective - Repair or change faulty component.
Worn or damaged mechanical components of drive system - Check drive system and change faulty components.

Hydraulics Troubleshooting

Hydraulic system is overheated
Hydraulic pressure is not correct - Adjust pressure as required.
Main relief valve malfunction or improper adjustment - Set up or change the relief valve.
Hydraulic oil contamination - Change hydraulic oil.
Lack of hydraulic oil - Fill up the hydraulic oil.
Hydraulic pump is faulty - Repair or install new hydraulic pump.

Boom does not raise or lower
Damaged lift controls - Change or repair.
Hydraulic pump not working - Repair or install new hydraulic pump.
Faulty hydraulic control valve - Repair or replace hydraulic valve.
Faulty hydraulic cylinder - Repair or change hydraulic cylinder.
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.

Bucket does not tilt
Bucket controls failure - Repair or replace.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Defective hydraulic control valve - Repair or replace hydraulic valve.
Bucket cylinder failure - Install a new cylinder or repair it.
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.

Bucket or lift arm is moving slowly
Hydraulic pump is worn - Check hydraulic pump flow and replace pump if necessary.
Leaking hydraulic cylinder - Replace cylinder piston seals.
Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.
Damaged or incorrect adjusted hydraulic control valve - Set properly or repair.
Hydraulic system loosing pressure - Adjust pressure correctly.

Bucket or boom jerks when working
Air trapped in hydraulic system - Need to bleed air.
Hydraulic oil filter clogging - Clean or install new filter.
Hydraulic fluid is dirty - Hydraulic fluid change required.
Cylinder tube or rod is scored - Replace defective component.

Hydraulic pump is excessively noisy
Hydraulic leakage or lack of oil - Add hydraulic oil or correct system leaks.
Hydraulic filter is clogged - Clean or install new filter.
Suction line is clogged - Suction line must be serviced.
Air enters the pump - Remove air from hydraulics.
Faulty pump parts - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery will not charge
Corroded or loose wire connections - Tighten or clean connections.
Battery terminal clamps are defective - Change terminal clamps.
Worn-out battery - Use a new battery.
Loose or damaged belt - Adjust belt tension or replace belt.

Starter motor turns slow
Low battery power - Battery is drained, charge it.
Battery will not hold charge - Service charging system or change battery.
Bad battery terminals or disconnected wiring - Check battery wires and service or replace terminals.

Starter does not work
Battery is low or faulty - Battery needs to be recharged or replaced.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery voltage - Battery is drained, recharge it.
Defective starter motor - Starter needs to be replaced.