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Gehl 4510 Troubleshooting

The Gehl SL 4510 skid steer loader is powered by 98 cubic inches (1.6L) Ford KSG-416 4-cycle 4-cylinder gasoline engine with a rated power of 40 hp (29.8 kW) at 3000 rpm. The Gehl SL 4510 is equipped with a radial-lift loader boom, single-speed hydrostatic transmission, 80H drive chains, and 7.00x15 or 10.00x16.5 tires. The hydraulic system has a pump with fluid flow rate of 16 gpm (60.6 lpm). The hydraulic pressure is 2800 psi (193 bar). The skid steer loader has a rated operating capacity of 3000 lbs (1362 kg) and tipping load of 6000 lbs (2724 kg). The lift height is 114.5 inches (2910 mm) to hinge pin, and dump reach at max height is 18 inches (455 mm).

Engine Troubleshooting

Engine doesn't start or starts hard
Empty fuel tank - Fill gasoline up.
Low-quality gasoline - Use correct gasoline grade.
Dirty fuel system - Check and clean.
Damaged spark plug wiring connection - Inspect the spark plug wire connection, replace or repair.
Spark plug is faulty - Spark plug need to be replaced.
Ignition system problems - Test ignition and replace failed parts.
Clogged fuel filter - Fuel filter needs to be replaced.
Fuel lines are clogged - Fuel lines need to be cleaned.
Clogged or damaged fuel pump - Inspect fuel pump and change as required.
Carburetor is dirty - Wash, clean and adjust.
Engine has bad compression - Check cylinder block and change wear parts.

Unstable engine running
Ignition system is defective - Test ignition and replace failed parts.
Air filter element is clogged - Clean or replace.
Damaged spark plug - Change spark plug as required.
Fuel pump is clogged or faulty - Test fuel pump and replace if necessary.
Valve clearance is not correct - Adjustment procedure required.
Wrong ignition timing - Adjust ignition timing as required.
Low idle speed set incorrectly - Correct the settings.

Engine stalls after starting
Spark plug is faulty - Change spark plug.
Clogged or faulty carburetor - Replace or service carburetor.
Defective ignition coil - Ignition coil must be replaced.
Bad or damaged valve springs - Valve springs need to be changed.
Valves are stuck - Valves need to be cleaned.

Engine overheating
Engine oil level is low - Check oil level and add oil as required.
Engine overloaded - Reduce load.
Carburetor mixture is too lean - Set the carburetor correctly.
Ignition timing is wrong - Adjust ignition timing correctly.
Wrong valve setting - Set the valves correctly.
Dirty radiator core or defective radiator cap - Clean radiator or replace cap.
Lack of engine coolant - Add coolant fluid to cooling system and also check it for leaks.
Damaged thermostat - Install new thermostat.
Faulty water pump - Replace water pump.

Engine knocks or noises
Low octane gasoline - Change gasoline.
Engine is overloaded - Load reducing is recommended.
Engine oil level is insufficient - Fill up the oil to required level.
Low idle speed setting is incorrect - Need to adjust idle speed.
Dirty or faulty fuel pump - Inspect fuel pump and change as required.
Main bearings or crankshaft are worn out - Replace crankshaft or bearings.
Incorrect valve clearance - Adjust to proper valve clearance.
Piston rings or cylinder bore are worn - Change faulty parts.

Engine power loss
Carburetor is clogged or incorrectly adjusted - Service or properly adjust carburetor.
Clogged air filter - Replace or service air filter.
Fuel pump is damaged or dirty - Clean or replace fuel pump.
Ignition system is defective - Inspect ignition system and change failed components.
Damaged cylinder-head gasket - Replace the head gasket.
Valves are stuck or burned - Clean or change valves.
Cylinder block parts are worn out - Change defective components.
Clogged oil filter - Service or change oil filter.

High fuel consumption
Dirty air filter element - Service or replace air filter.
Improper adjustment of carburetor main jet - Adjust it correctly.
Spark plug is loose or defective - Tighten or replace spark plug.
Improper ignition timing - Set the ignition timing correctly.
Stuck, worn, or burned valves - Change or clean valves.
Worn piston, rings, or sleeve - Replace faulty parts.
Incorrect valve clearance - Adjustment procedure required.
Weak cylinder compression - Inspect cylinder block and change worn parts.

Engine consuming too much oil
Gaskets or seals may be damaged - Defective components must be replaced.
Damaged valve stems or valve guides - Replace defective valves.
Piston rings are seized or worn - Install new piston rings.
Cylinder liner or piston is damaged - Check liner and piston, replace as required.

Engine backfires
Too lean carburetor mixture - Set the carburetor correctly.
Fuel lines are clogged - Fuel lines need to be cleaned.
Bad ignition timing - Set the ignition timing correctly.
Wrong valve setting - Set the valves correctly.
Air filter is dirty - Service or replace air filter.

Drive System Troubleshooting

Drive system won't operate in either direction
Insufficient hydraulic fluid - Add fluid as required.
Drive chain is worn - Check drive chain and change defective components.
Relief valve is stuck - Repair or change.
Suction line or hydraulic filter is clogged - Service suction line or replace hydraulic filter.
Defective foot or hand controls - Repair or change.
Drive motor or pump is worn - Repair or change faulty component.

Power is too low
Dirty hydraulic oil filter - Replace hydraulic filter.
Faulty or opened relief valve - Close or replace relief valve.
Faulty or damaged transmission components - Inspect and replace faulty parts.
Worn input drive shaft - Change or repair faulty drive shaft.
Hydraulic system is leaking air - Need to bleed air.

Drive system overheating
Hydraulic fluid is insufficient - Check and refill the hydraulic fluid.
Hydraulic fluid filter is dirty - Replace or clean hydraulic filter.
Worn or defective relief valve - Change or repair defective relief valve.
Hydraulic motor or drive pump is worn - Change or repair faulty component.
Hydraulic oil cooler is dirty - Cooling fins need to be cleaned.
Drive system overloaded continuously - Load needs to be reduced.

Excessive noise
Oil viscosity is too heavy - Use oil of proper viscosity.
Hydraulic system is leaking air - Bleed air from system.
Drive pump or hydraulic motor malfunction - Change or repair faulty component.
Worn or damaged mechanical components of drive system - Check the parts for worn or defect and replace if required.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure is not correct - Set pressure correctly.
Main relief valve is defective or unadjusted - Replace or set up the relief valve.
Hydraulic oil is contaminated - Change hydraulic oil.
Hydraulic oil level is low - Check oil level and add hydraulic oil as required.
Hydraulic pump is worn - Repair or install new hydraulic pump.

Lift arm won't raise or lower
Defective lift controls - Inspect and repair if necessary.
Hydraulic pump not working - Repair or install new hydraulic pump.
Hydraulic control valve is defective - Install a new valve or repair it.
Faulty hydraulic cylinder - Replace or repair boom cylinder.
Hydraulic oil is insufficient - Need to add oil.

Bucket tilt does not work
Faulty bucket tilt controls - Change or repair.
Hydraulic pump not working - Repair or replace pump if necessary.
Hydraulic control valve is faulty - Repair or change the valve.
Hydraulic bucket cylinder not working - Install a new cylinder or repair it.
Hydraulic fluid level low - Fill up the hydraulic fluid.

Slow bucket or lift arm action
Worn hydraulic oil pump - Test pump flow rate and replace pump if required.
Oil leaks from hydraulic cylinder - Cylinder seals need to be replaced.
Low hydraulic oil level - Check and refill the hydraulic oil.
Hydraulic control valve is faulty or out of adjustment - Repair or adjust correctly.
Hydraulic pressure has dropped - Correct adjustment is required.

Lift arm or bucket is jerky
Air leaks in hydraulic system - Bleed hydraulic system.
Plugged hydraulic oil filter - Replace or clean the filter.
Contaminated hydraulic oil - The oil must be changed.
Cylinder tube or rod scoring - Replace damaged component.

Hydraulic pump is excessively noisy
Hydraulic leakage or low oil level - Remedy hydraulic leakage or refill oil as necessary.
Clogged hydraulic filter - Replace or clean the filter.
Suction line is dirty - Need to service the suction line.
Pump is sucking air - Bleed air.
Faulty pump parts - Rebuild or install new pump.

Electrical Troubleshooting

Battery cannot be charged
Electrical cable connections are loose or corroded - Clean or tighten wiring connections.
Defective battery terminal clamps - Replace terminal clamps.
Battery is worn - Install a new battery.
Loose or worn belt - Need to adjust belt tension or replace belt.

Starter cranks slow
Battery voltage is low - Recharge the battery.
Battery won’t hold charge - Service charging system or replace battery.
Bad terminals or disconnected battery cables - Connect wiring correctly or install new terminals.

Starter does not work
Battery is low or faulty - Battery needs to be recharged or replaced.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery capacity - Charge the battery.
Starter motor is defective - Starter needs to be changed.