Gehl RT175 Track Loader Troubleshooting

The Gehl RT175 compact track loader driveline system components: a 202.5 cu.in (3.3L) Yanmar 4TNV98C 4-cylinder liquid-cooled diesel engine with a rated power of 69.3 hp (51.7 kW), and two-speed transmission. The hydraulic system has a pump with a rated flow of 18.5 gpm (70 lpm). The system pressure is 3000 psi (207 bar). The Gehl RT175 is equipped with a radial-lift loader boom, automatic track tension system, undercarriage with 3 steel rollers and rubber tracks. The loader has a boom lift force of 5016 lbs (2275 kg) and bucket breakout force of 5355 lbs (2430 kg). The rated operating capacity is 1750 lbs (795 kg), and tipping load is 5000 lbs (2270 kg).

Engine Troubleshooting

Engine starts hard or will not start

There is air in the fuel system - Bleed the system.
Fuel filter element clogging - Clean the filter or install new filter element.
Burnt or clogged injection nozzle - Inspect nozzles and replace if necessary.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve out of adjustment - Correct valve clearance.
Fuel injection pump is not working correctly - Rebuild or replace pump.

Diesel starts and stops

Clogged air filter - Change or service air filter element.
Dirty fuel filter - Replace filter element.
Fuel injection pump has loose connections - Tighten the connections.
Dirty or defective injectors - Replace or clean fuel injectors.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.

Engine stops unexpectedly during operation

Low coolant temperature - Warm up the engine.
Fuel filter is plugged - Service or replace the filter.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Change fuel injection nozzles.
Improper setting of fuel injection pump timing - Adjust as recommended.

Engine stops at low idle speed

Low idle speed setting is not correct - Correct the settings.
Fuel injection pump malfunctioning - Rebuild or replace pump.
Damaged or clogged injectors - Change or clean fuel injectors.
Improper valve clearance - Adjust to proper valve clearance.

Engine power is too low

Plugged air filter - Clean or change.
Clogged injection nozzle - Test injection nozzles and change if necessary.
Insufficient fuel injection pressure - Adjust to correct pressure.
Valve out of adjustment - Adjust valve clearance.
Incorrectly adjusted low idle speed - Normalize low idle speed.
Fuel hoses or lines clogging - Service fuel lines and hoses.
Cylinder head gasket is defective - Install a new gasket.
Defective or worn piston rings - Piston rings need to be replaced.

Engine overheating

Insufficient coolant fluid - Add coolant fluid and inspect the cooling system for leaks.
Engine oil level low - Need to add engine oil.
Radiator core is dirty or radiator cap is damaged - Clean radiator or replace cap.
Loose or damaged fan belt - The fan belt needs to be replaced.
Engine is overloaded - Load reducing required.

Low oil pressure

Low oil level - Need to add oil.
Oil filter element clogging - Change or clean engine oil filter element.
Incorrect oil viscosity - Use oil of proper viscosity.
Main bearing oil clearance is excessive - Replace bearings.
Worn oil pump - Install a new pump.

Engine knocking or noise

Not enough engine oil - Need to add engine oil.
Low coolant temperature - Warm up the engine.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.
Incorrect low idle speed adjustment - Test and adjust.
Defective fuel injectors - Inspect fuel injectors and change as required.
Connecting rod is worn or misaligned - Connecting rod must be aligned or replaced.
Pistons are scored or worn - Pistons need to be replaced.

Drive System Troubleshooting

Machine will not move forward or backward

Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.
Damaged or jammed track mechanism - Repair or remedy jamming.
Faulty relief valve - Repair or replace.
Dirty suction line or hydraulic filter - Service suction line or change hydraulic filter.
Hand or foot controls malfunction - Repair or change.
Worn drive motor or pump - Inspect and change as required.

Machine does not drive straight or drives jerky

Jammed or damaged undercarriage tracks - Repair or remedy jamming.
Tracks are improperly tensioned or faulty - Adjust track tension or replace tracks.
Foreign objects, debris, or dirt jammed in track frame - Remove debris or foreign objects and clean track frame.

Loss of power

Plugged hydraulic oil filter - Replace or service hydraulic filter.
Relief valve is worn or opened - Replace or close relief valve.
Worn or faulty transmission components - Check and replace defective components.
Input drive shaft is stuck - Faulty drive shaft need to be replaced or repair.
Air trapped in hydraulic system - Bleed air from hydraulic system.

Drive system overheats

Hydraulic oil level is low - Need to add oil.
Clogged hydraulic fluid filter - Replace or clean hydraulic filter.
Stuck relief valve - Change or repair relief valve.
Damaged drive pump or hydraulic motor - Check and repair if required.
Dirty oil cooler - Clean the cooling fins.
Transmission overloading - Load needs to be reduced.

Drive system is excessively noisy

Oil viscosity is too heavy - Use oil of proper viscosity.
Air leaks in hydraulic system - Bleed air from hydraulic system.
Damaged drive pump or hydraulic motor - Repair or change faulty component.
Defective or worn mechanical components of drive system - Check the parts for defect or damage and change if required.

Hydraulics Troubleshooting

Hydraulic system is overheated

Hydraulic pressure is not correct - Adjust pressure correctly.
Main relief valve malfunction or improper adjustment - Replace or set up the relief valve.
Hydraulic oil is contaminated - The oil must be changed.
Lack of hydraulic oil - Add oil to the hydraulic system.
Faulty hydraulic oil pump - Install new pump or repair it.

Lift arm can't drop or lift

Lift controls malfunction - Repair or change.
Damaged hydraulic oil pump - Replace or repair pump if necessary.
Faulty hydraulic control valve - Repair or replace the valve.
Hydraulic cylinder failure - Repair or change hydraulic cylinder.
Insufficient hydraulic fluid - Add fluid as required.

Bucket does not tilt

Faulty bucket tilt controls - Check and repair as required.
Defective hydraulic pump - Change or repair hydraulic pump if required.
Hydraulic control valve is faulty - Repair or replace hydraulic valve.
Hydraulic bucket cylinder is defective - Repair or change cylinder.
Hydraulic oil is insufficient - Need to add oil.

Boom or bucket is moving slowly

Defective hydraulic pump - Check pump flow and install new pump if necessary.
Hydraulic cylinder leaking - Change cylinder piston seals.
Hydraulic fluid level low - Fill the system to proper hydraulic fluid level.
Hydraulic control valve is unadjusted or worn - Adjust properly or repair.
Hydraulic system loosing pressure - Set pressure correctly.

Lift arm or bucket is moving jerkily

Air in the hydraulic system - Air bleeding is required.
Dirty hydraulic oil filter element - Clean or change the filter.
Dirty hydraulic oil - Change hydraulic oil.
Scored cylinder tube or rod - Replace damaged component.

Hydraulic pump makes excessive noise

Hydraulic leakage or low oil level - Repair hydraulic leaks or add oil as required.
Hydraulic filter clogging - Clean or change the filter.
Dirty suction line - Service the suction line.
Air enters the pump - Air bleeding is required.
Worn pump parts - Change or rebuild pump.

Electrical Troubleshooting

Battery won’t charge

Corroded or loose cable connections - Clean or tighten connections.
Battery terminal clamps are faulty - Replace terminal clamps.
Battery failing - Change the battery.
Loose or defective belt - Belt needs to be adjusted or changed.

Starter cranks slowly

Low battery power - Recharge the battery.
Battery runs out quickly - Service charging system or change battery.
Faulty battery terminals or disconnected cables - Check cables and service or change terminals.

Starter is not working

Battery is discharged or worn - Battery needs to be recharged or replaced.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery capacity - Low battery charging, charge as required.
Damaged starter motor - Starter should be changed.