ASV RT-75 HD Track Loader Troubleshooting

The ASV RT75HD compact track loader driveline system components: a 171 cu.in (2.8L) Cummins QSF-2.8 vertical 4-cylinder turbocharged diesel engine with a rated power of 74 hp (55 kW) and 2-speed hydro transmission. The hydraulic system has a high flow pump with a rated capacity of 35.7 gpm (135.1 lpm). The system pressure is 3300 psi (227 bar). The RT-75 HD is equipped with radial-lift loader boom, axial-piston drive pumps, and 18" (475 mm) rubber tracks with embedded co-polymer cords. The loader has a maximum lift height is 125.5" (3190 mm) to hinge pin. The rated operating capacity is 2650 lbs (1202 kg), and tipping load is 7570 lbs (3437 kg).

Engine Troubleshooting

Diesel engine hard to start or doesn't start

Air in the fuel lines - Bleed the fuel lines.
Fuel filter plugging - Service or replace the filter.
Fuel injection nozzles are damaged - If necessary, replace with a new nozzle.
Water in the fuel system - Change fuel and repair fuel system.
Improper valve clearance - Check and adjust as required.
Fuel injection pump is defective - Repair or install new pump.

Diesel starts but then stops

Plugged air filter - Clean or replace element.
Clogged fuel filter - Clean or replace the filter.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Damaged or clogged injectors - Test and replace fuel injectors if necessary.
Damaged fuel injection pump - Repair or install a new fuel pump.

Engine shuts off suddenly while running

Engine is not warmed up to required temperature - Warm up the engine as required.
Fuel filter element is dirty - Change the filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Dirty or damaged injection nozzles - Clean or replace injection nozzles.
Incorrect adjustment of fuel injection pump timing - Adjust as recommended.

Engine stops while idle

Wrong adjustment of low idle speed - Adjust the low idle speed.
Faulty fuel injection pump - Repair or install a new fuel pump.
Dirty or defective injectors - Inspect fuel injectors and change as required.
Valve clearance is out of adjustment - Correct valve clearance needs to be set.

Engine power loss

Plugged air cleaner - Clean or replace element.
Defective or clogged injection nozzle - Clean or replace injection nozzles.
Insufficient fuel injection pressure - Correct the pressure settings.
Valve clearance is out of adjustment - Need to adjust valve clearance.
Incorrect low idle setting - Adjust low idle speed.
Dirt in the fuel lines or hoses - Service fuel hoses and lines.
Cylinder head gasket defective - Install new cylinder head gasket.
Piston rings are leaking or defective - Replace the piston rings as required.

Engine overheated

Lack of engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Engine oil level is low - Checking oil level and add if necessary.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or change cap.
Fan belt slipping or worn - Replace the fan belt.
Engine is overloaded - Load reducing is recommended.

Oil pressure is low

Insufficient engine oil - Check and refill the oil.
Engine oil filter is plugged - Change or clean engine oil filter element.
Incorrect engine oil Use correct viscosity oil.
Excessive crankshaft bearing oil clearance - Change bearings.
Oil pump malfunction - Repair or change.

Abnormal engine knocking or noise

Engine oil insufficient - Add oil to the engine crankcase.
Low coolant temperature - Normalize the temperature by warming up the engine.
Wrong setting of fuel injection pump timing - Adjust the pump as required.
Low idle speed adjustment is incorrect - Test and adjust.
Clogged or defective injectors - Inspect fuel injectors and change as required.
Connecting rod failure or misalignment - Connecting rod must be aligned or replaced.
Pistons are worn or broken - Have pistons replaced.

Drive System Troubleshooting

Drive system does not work in either direction

Hydraulic oil is insufficient - Need to add oil.
Track mechanism is jammed or defective - Repair or remove jamming.
Relief valve is not working correctly - Change or repair relief valve.
Plugged hydraulic filter or suction line - Check, clean, or change if necessary.
Defective or worn foot or hand controls - Change or repair.
Drive motor or pump is worn - Inspect and replace as necessary.

Machine will not drive straight or drives jerky

Track mechanism is jammed or defective - Repair or fix jamming.
Tracks are sagging or malfunctioning - Correct track sag with tensioning or repair tracks.
Foreign objects, debris, or dirt jammed in track frame - Remove debris or foreign objects and clean track frame.

Loss of power

Hydraulic oil filter is clogged - Replace hydraulic filter.
Opened or defective relief valve - Close or replace relief valve.
Transmission parts are worn or defective - Check and change faulty components.
Input drive shaft failure - Repair or install a new drive shaft.
Hydraulic system is leaking air - Bleed hydraulic system.

Drive system overheating

Insufficient hydraulic fluid - Add fluid as required.
Dirty hydraulic fluid filter - Change or clean hydraulic filter.
Worn or damaged relief valve - Repair or install a new relief valve.
Worn hydraulic motor or drive pump - Inspect and replace as necessary.
Plugged hydraulic oil cooler - Clean cooling fins as required.
Overloaded drive system - Reduce loading.

Excessive noise

Oil viscosity is wrong - Use the specified type of oil.
Air in hydraulic system - Bleed air from hydraulic system.
Drive pump or hydraulic motor malfunction - Inspect and replace as necessary.
Mechanical parts of drive system are worn or damaged - Inspect the components for worn or defect and repair as required.

Hydraulics Troubleshooting

Hydraulic system overheated

Hydraulic pressure incorrectly adjusted - Correct adjustment is required.
Main relief valve is damaged or adjusted improperly - Set up or change the relief valve.
Hydraulic oil is contaminated - Change hydraulic oil.
Lack of hydraulic oil - Add oil to the hydraulic system.
Hydraulic pump is worn - Replace or repair pump if necessary.

Boom won't lower or raise

Lift controls failure - Replace or repair.
Hydraulic pump malfunction - Repair or replace pump if necessary.
Hydraulic control valve failure - Replace or repair the valve.
Hydraulic cylinder not working - Install a new boom cylinder or repair it.
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.

Bucket fails to tilt

Bucket tilt controls are defective - Inspect and repair if necessary.
Damaged hydraulic oil pump - Replace or repair pump if necessary.
Faulty hydraulic control valve - Replace or repair the valve.
Defective bucket cylinder - Replace or repair cylinder.
Hydraulic oil is insufficient - Need to add oil.

Boom or bucket is moving slowly

Faulty hydraulic oil pump - Check pump capacity and change if necessary.
Hydraulic cylinder oil leakage - Change cylinder piston seals.
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.
Hydraulic control valve is defective or set improper - Repair or set correctly.
Hydraulic pressure is low - Set pressure correctly.

Lift arm or bucket is moving jerkily

Hydraulic system is leaking air - Need to bleed air.
Hydraulic oil filter is clogged - Clean or replace the filter.
Dirty hydraulic oil - Fill up with fresh hydraulic oil.
Scratched cylinder rod or tube - Replace failed component.

Excessive hydraulic pump noise

Low oil level or hydraulic leaks - Remedy hydraulic leakage or refill oil as necessary.
Dirty hydraulic filter - Clean or install new filter.
Suction line is dirty - Suction line must be serviced.
Air in hydraulic pump - Remove air from hydraulics.
Faulty pump parts - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery won’t charge

Electrical wire connections are corroded or loose - Tighten or service cable connections.
Battery terminal connectors are faulty - Terminal connectors need to be changed.
Battery faulty cell - Change the battery.
Belt is damaged or loose - Adjust belt tension or replace belt.

Starter turns slow

Low battery output - Low battery charging, charge as required.
Battery will not hold charge - Service battery or replace it.
Wires are disconnected or battery terminals are corroded - Connect wires properly or change terminals.

Starter is not cranking

Battery is discharged or defective - Recharge or change battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery voltage is low - Battery is drained, charge it.
Starter motor is damaged - Starter should be replaced.