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Gehl 3725 Troubleshooting

The Gehl 3725 skid steer loader driveline system components: a 67 cu.in (1.1L) Ford VSG-411 vertical in-line four-cylinder gasoline engine with a rated power of 35 hp (26 kW), and single-speed hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 10 gal/min (38 l/min). The system relief pressure is 2500 psi (172 bar). The Gehl 3725 is equipped with a radial-lift boom, 60HE drive chains, and 7.00x12 (Std) or 5.70x15 (Opt) tires. The skid steer loader has a max lift height of 107.5" (2730 mm) to hinge pin and dump height of 86.3" (2190 mm). The rated operating capacity is 950 lbs (432 kg), and tipping load is 1900 lbs (865 kg).

Engine Troubleshooting

Engine starts up hard or doesn't start
Empty fuel tank - Fill it up.
Low-quality gasoline - Use correct fuel grade.
Fuel system clogged - Repair or replace.
Spark plug wire connection are damaged - Inspect spark plug wiring connection, change or repair.
Faulty spark plug - Replace spark plug.
Ignition system failure - Check ignition and replace faulty components.
Fuel filter is dirty - Change fuel filter.
Restricted fuel lines - Fuel lines need to be cleaned.
Clogged or damaged fuel pump - Clean or change fuel pump.
Carburetor incorrectly set - Set carb correctly.
Bad compression - Check and change damaged parts.

Engine runs unevenly
Ignition system failure - Check ignition and replace faulty components.
Plugged air filter - Clean or replace.
Defective spark plug - Spark plug need to be replaced.
Dirty or damaged fuel pump - Test fuel pump and replace if necessary.
Incorrect valve clearance - Adjust to proper valve clearance.
Improper ignition timing - Ignition timing needs to be set properly.
Incorrect low idle setting - Need to adjust idle speed.

Engine starts and stops suddenly
Spark plug is faulty - Spark plug need to be replaced.
Carburetor is clogged or faulty - Clean or replace carburetor.
Faulty ignition coil - Install a new ignition coil.
Bad or broken valve springs - Change valve springs.
Stuck valves - Valves need to be cleaned.

Engine overheating
Engine oil insufficient - Need to add engine oil.
Engine is under excessive load - Reduce engine load.
Too lean carburetor mixture - Set the carburetor correctly.
Incorrect ignition timing - Adjust ignition timing as required.
Valve setting is incorrect - Set the valves correctly.
Radiator core is clogged or radiator cap is leaking - Clean radiator or install new cap.
Engine has a lack of coolant - Refill to the correct level and inspect system for leaks.
Thermostat failure - Change thermostat.
Water pump failure - Replace water pump.

Engine knocking sound or abnormal noise
Low octane gasoline - Use proper fuel.
Engine is under excessive load - Reduce engine load.
Engine oil level is low - Fill up the oil to required level.
Incorrectly set low idle speed - Correct idle adjustment.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Main bearings or crankshaft failure - Install new parts as as required.
Incorrect valve clearance - Need to adjust valve clearance.
Cylinder bore or piston rings are worn - Replace defective components.

Engine power loss
Carburetor is incorrectly adjusted or dirty - Service or correctly adjust carburetor.
Dirty air filter element - Service or change air filter.
Dirty or damaged fuel pump - Clean or change fuel pump.
Defective ignition - Check ignition system and replace faulty parts.
Defective cylinder head gasket - Replace the head gasket.
Burned or stuck valves - Service or replace valves.
Worn cylinder block parts - Replace defective components.
Oil filter is blocked - Replace or service oil filter.

Engine uses too much fuel
Air filter element is clogged - Clean or replace air filter.
Incorrect carburetor main jet adjustment - Adjust main jet as required.
Loose or faulty spark plug - Replace or tighten spark plug.
Ignition timing is improper - Set the ignition timing correctly.
Valves are stuck, worn, or burned - Clean or replace valves.
Piston, sleeve, or rings are damaged - Change faulty components.
Valve clearance is improper - Adjust valve clearance.
Low compression - Check and replace worn parts.

Excessive oil consumption
Seals or gaskets are defective - New components need to be installed.
Valve guides and stems are worn - Valves must be replaced.
Piston rings are stuck or broken - Piston rings need to be replaced.
Worn cylinder liner or piston - Check liner and piston, replace as required.

Engine backfires
Carburetor mixture is too lean - Set the carburetor correctly.
Restricted fuel lines - Clean fuel system lines.
Bad ignition timing - Ignition timing needs to be set properly.
Valve setting is wrong - Set the valves properly.
Air filter element is plugged - Clean or change air filter.

Drive System Troubleshooting

Machine will not move forward or backward
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Drive chain failure - Check drive chain and change faulty parts.
Damaged input drive shaft - Repair or install a new drive shaft.
Relief valve is damaged or worn - Service or change relief valve.
Hydraulic filter or suction line is clogged - Check, clean, or change if necessary.
Defective or worn foot or hand controls - Check and repair as required.
Drive motor or pump is defective - Repair or change faulty component.

Loss of power
Hydraulic oil filter is dirty - Replace hydraulic filter.
Relief valve is defective or open - Change or close relief valve.
Transmission parts are damaged or faulty - Check and change defective components.
Worn input drive shaft - Faulty drive shaft need to be replaced or repair.
Air in the hydraulic system - Bleed air from system.

Drive system keeps overheating
Insufficient hydraulic fluid - Add fluid as required.
Hydraulic fluid filter is clogged - Replace or service hydraulic filter.
Relief valve malfunction - Change or repair defective relief valve.
Drive pump or hydraulic motor is damaged - Inspect and change as required.
Hydraulic oil cooler is plugged - Cooling fins need to be cleaned.
Overloaded drive system - Load should be reduced.

Excessive noise
Improper oil viscosity - Use oil of proper viscosity.
Hydraulic system is leaking air - Air bleeding is required.
Hydraulic motor or drive pump is worn - Change or repair faulty component.
Mechanical parts of drive system are damaged or worn - Check drive system and change faulty components.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure is not adjusted correctly - Adjust it correctly.
Defective or misadjusted main relief valve - Adjust the valve or replace if necessary.
Dirty hydraulic fluid - The fluid must be changed.
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required.
Faulty hydraulic oil pump - Replace or repair pump if necessary.

Boom does not raise or lower
Lift controls are faulty - Check and repair as required.
Hydraulic pump failure - Install new pump or repair it.
Hydraulic control valve malfunction - Change or repair hydraulic valve.
Hydraulic cylinder is broken - Repair or change hydraulic cylinder.
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.

Bucket does not tilt
Faulty bucket tilt controls - Repair or replace.
Hydraulic pump not working - Replace or repair pump if necessary.
Hydraulic control valve malfunction - Install a new valve or repair it.
Hydraulic bucket cylinder not working - Repair or replace cylinder.
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.

Boom or bucket is working slowly
Defective hydraulic pump - Check pump performance and change it if necessary.
Hydraulic cylinder oil leakage - Install new cylinder seals.
Hydraulic fluid level low - Fill up the hydraulic fluid.
Hydraulic control valve is defective or set improper - Set properly or repair.
Low hydraulic pressure - Adjust pressure as required.

Bucket or boom movements are jerky
Air leaks in hydraulic system - Bleed hydraulic system.
Hydraulic oil filter element clogging - Replace or clean the filter.
Contaminated hydraulic fluid - Change hydraulic fluid.
Scratched cylinder rod or tube - Change failed component.

Hydraulic pump is excessively noisy
Hydraulic leaks or lack of oil - Add hydraulic oil or correct system leaks.
Hydraulic filter is dirty - Change or clean oil filter.
Suction line is dirty - Suction line must be serviced.
Air in hydraulic pump - Remove air from hydraulics.
Worn pump components - Rebuild or install new pump.

Electrical Troubleshooting

Battery does not charge
Corroded or loose cable connections - Tighten or service connections.
Faulty electrical terminal connectors - Replace terminal connectors.
Battery is defective - Battery change required.
Belt is defective or loose - Need to adjust belt tension or replace belt.

Starter cranks slowly
Low battery output voltage - Recharge the battery.
Battery runs out quickly - Service or change the battery.
Disconnected cables or faulty battery terminals - Connect cables correctly or replace terminals.

Starter motor won't turn
Battery is low or faulty - Replace or charge as required.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Battery capacity is low - Recharge the battery.
Starter motor failing - Repair or change starter.