Gehl 6625DX Skid Steer Troubleshooting

The Gehl 6625 DX skid steer loader driveline system components: a 183 cu.in (3L) Perkins 204.30 four-cylinder liquid-cooled diesel engine with a rated power of 70 hp (52 kW), and single-speed hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 23 gal/min (87.1 l/min). The system relief pressure is 3000 psi (207 bar). The Gehl 6625DX is equipped with a radial-lift loader boom, 80H roller chains, and 12x16.5 or 31-15.5x15 tires. The skid steer loader has a maximum lift height of 123" (3125 mm) to hinge pin and dump height of 98.8" (2510 mm). The rated operating capacity is 2050 lbs (930 kg), and tipping load is 4100 lbs (1860 kg).

Engine Troubleshooting

Engine hard to start or will not start

Air in fuel tank - Bleed fuel tank.
Fuel filter element clogging - Replace filter element.
Burnt or defective injection nozzle - Change fuel injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Improper valve clearance - Adjust valve clearance according to specifications.
Defective fuel injection pump - Install a new pump or rebuild.

Engine starts and stalls suddenly

Plugged air cleaner - Clean or change cleaner.
Fuel filter plugging - Install new filter element.
Fuel injection pump is leaking - Repair any leaks.
Dirty or defective injectors - Test and replace fuel injectors if necessary.
Fuel injection pump failure - Repair or install a new fuel pump.

Engine stops unexpectedly during operation

Low coolant temperature - Warm up the engine to required temperature.
Clogged fuel filter - Service or replace the filter.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are clogged or faulty - Clean or change injection nozzles.
Wrong setting of fuel injection pump timing - Set up as recommended.

Engine stops while idle

Low idle speed set incorrectly - Adjust the low idle speed.
Fuel injection pump is faulty - Repair or install new pump.
Clogged or defective injectors - Replace or clean fuel injectors.
The valve clearance is not adjusted - Have it adjusted.

Engine power is too low

Plugged air filter - Clean or replace element.
Fuel injection nozzles are damaged or dirty - Check injection nozzles and replace if required.
Fuel injection pressure is wrong - Check the fuel injection pressure and adjust if necessary.
Improper valve clearance - Adjustment procedure required.
Low idle speed setting is incorrect - Need to adjust idle speed.
Dirty fuel lines or hoses - Service fuel hoses and lines.
Damaged cylinder-head gasket - Install a new gasket.
Piston rings are defective or leaking - Replace piston rings.

Engine overheated

Low engine coolant - Refill to the correct level and inspect system for leaks.
Engine oil level is insufficient - Check oil level and add oil as required.
Faulty radiator cap or dirty radiator fins - Clean radiator or install new cap.
Damaged or worn fan belt - If necessary, replace the belt.
Diesel engine overloaded - Load reducing required.

Oil pressure is low

Oil level is low - Add oil to the engine crankcase.
Clogged oil filter element - Change or service engine oil filter.
Wrong oil viscosity - Fill up with the proper oil viscosity.
Crankshaft bearing has excessive oil clearance - Install new bearings.
Worn oil pump - Inspect and change as required.

Engine knocking sound or abnormal noise

Lack of engine oil - Checking oil level and add if necessary.
Low coolant temperature - Warm up the engine.
Fuel injection pump timing is wrong - Adjust fuel injection pump as required.
Low idle speed set incorrectly - Adjust the low idle speed.
Clogged or defective injectors - Clean fuel injectors or change it.
Connecting rod is not aligned or worn - Align or change connecting rod.
Pistons are broken or worn - Replace the pistons.

Drive System Troubleshooting

Drive system does not work in either direction

Hydraulic oil level is low - Need to add oil.
Drive chain malfunction - Check drive chain and change faulty parts.
Input drive shaft is not working properly - Change or repair.
Stuck relief valve - Service or change relief valve.
Hydraulic filter or suction line is clogged - Check, clean, or change if necessary.
Hand or foot controls malfunction - Repair or change.
Drive pump or motor malfunction - Check and repair if required.

Loss of power

Dirty hydraulic oil filter - Replace or service hydraulic filter.
Relief valve is defective or open - Replace or close relief valve.
Transmission components are worn or defective - Check and change faulty components.
Defective input drive shaft - Service or change faulty drive shaft.
Air in the hydraulic system - Bleed air from system.

Drive system overheating

Low hydraulic fluid level - Fill up the hydraulic fluid.
Hydraulic fluid filter is clogged - Replace or clean hydraulic filter.
Relief valve is damaged - Change or repair relief valve.
Drive pump or hydraulic motor is damaged - Repair or replace faulty component.
Plugged hydraulic oil cooler - Cooling fins need to be cleaned.
Drive system is overloaded - Load should be reduced.

Drive system is noisy

Incorrect oil viscosity - Drain and refill with proper oil.
Hydraulic system is leaking air - Bleed hydraulic system.
Hydraulic motor or drive pump is worn - Check and repair if required.
Mechanical components of drive system are worn or damaged - Check the parts for defect or damage and change if required.

Hydraulics Troubleshooting

Hydraulic system overheating

Hydraulic pressure incorrectly adjusted - Set pressure correctly.
Main relief valve is damaged or adjusted improperly - Adjust or replace the relief valve.
Contaminated hydraulic fluid - The fluid must be changed.
Hydraulic fluid level is insufficient - Need to add fluid.
Defective hydraulic pump - Repair or change pump if required.

Lift arm can't drop or lift

Lift controls failure - Change or repair.
Hydraulic pump is broken - Repair or change pump if required.
Hydraulic control valve failure - Repair or change the valve.
Hydraulic cylinder failure - Install a new boom cylinder or repair it.
Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.

Bucket does not tilt

Bucket controls are faulty - Inspect and repair if necessary.
Hydraulic pump is broken - Repair or replace pump if necessary.
Hydraulic control valve is defective - Repair or change the valve.
Broken bucket cylinder - Repair or change cylinder.
Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.

Boom or bucket moves slowly

Faulty hydraulic oil pump - Check the pump performance and replace it if required.
Hydraulic cylinder oil leakage - Replace cylinder piston seals.
Hydraulic oil is insufficient - Need to add oil.
Worn or unadjusted hydraulic control valve - Adjust correctly or repair.
Hydraulic pressure has dropped - Set pressure correctly.

Lift arm or bucket is moving jerkily

Air in hydraulic system - Bleed air from system.
Hydraulic oil filter is dirty - Service or replace the hydraulic filter.
Hydraulic oil is contaminated - Hydraulic oil change required.
Cylinder tube or rod scoring - Replace worn component.

Excessive hydraulic pump noise

Insufficient oil level or leaking hydraulic system - Refill hydraulic oil or repair leaks in system.
Dirty hydraulic filter - Service or change hydraulic filter.
Suction line is clogged - Need to service the suction line.
Air in hydraulic pump - Remove air from hydraulics.
Worn pump components - Replace or rebuild the pump.

Electrical Troubleshooting

Battery won’t charge

Electrical cable connections are loose or corroded - Tighten or service cable connections.
Faulty battery terminal clamps - Terminal clamps should be changed.
Battery failing - Replace the battery.
Belt is worn or loose - Change belt or adjust belt tension.

Starter motor cranks slow

Battery capacity is low - Low battery charging, charge as required.
Battery is not holding charge - Service battery or change it.
Faulty battery terminals or disconnected cables - Check cables and service or change terminals.

Starter doesn't crank

Battery is low or faulty - Battery needs to be recharged or replaced.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery power is low - Low battery charging, charge as required.
Damaged starter motor - Starter should be changed.