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Gehl V420 Troubleshooting

The Gehl V420 skid steer loader is powered by 221 cu.in (3.6L) Deutz TCD 3.6 four-cycle four-cylinder vertical in-line direct injection turbocharged liquid-cooled diesel engine with a rated power of 99 hp (74 kW) at 2200 rpm. The Gehl V420 is equipped with a vertical-lift boom, two-speed hydrostatic transmission, 100K drive chains, and 14x17.5 HD standard tires. The hydraulic system has a pump with fluid flow rate of 30 gpm (114 lpm) or 41 gpm (155 lpm). The skid steer loader has a rated operating capacity of 4200 lbs (1905 kg) and tipping load of 8400 lbs (3810 kg). The lift height is 143.6" (3645 mm) to hinge pin, and dump height is 115" (2920 mm).

Engine Troubleshooting

Engine starts up hard or will not start
There is air in the fuel system - Bleed the system.
Fuel filter element is dirty - Change filter element.
Dirty or faulty injection nozzles - Test injection nozzles and change if necessary.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is wrong - Adjust valve clearance.
Fuel injection pump failure - Install a new fuel pump or repair.

Diesel starts and stalls immediately
Dirty air filter - Clean or change filter.
Fuel filter element is clogged - Change the filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Fuel injectors are dirty or defective - Clean or replace fuel injectors.
Fuel injection pump is faulty - Repair or change injection pump.

Engine shuts off while running
Engine is not preheated - Warm up engine as required.
Fuel filter element clogging - Replace the filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are faulty or clogged - Replace injection nozzles.
Incorrect adjustment of fuel injection pump timing - Set it up as required.

Engine stalling at idle
Incorrect low idle setting - Adjust as required.
Fuel injection pump is not working correctly - Install a new pump or rebuild.
Dirty or defective injectors - Clean fuel injectors or change it.
Valve clearance is not correct - Adjust valve clearance.

Low engine power
Dirty air filter - Service or replace the air filter.
Fuel injection nozzles are clogged or faulty - Install a new kit of correctly balanced nozzles.
Insufficient fuel injection pressure - Correct the pressure settings.
Valve clearance is wrong - Check and adjust as required.
Low idle speed setting is not correct - Correct low idle adjustment.
Fuel lines or hoses are clogged - Clean fuel system lines and hoses.
Cylinder head gasket defective - Replace cylinder head gasket.
Piston rings are broken or leaking - Replace piston rings.

Engine overheated
Not enough coolant - Top up coolant fluid and check system for leaks.
Low engine oil level - Check oil level and add oil as required.
Dirty radiator core or defective radiator cap - Install new cap or clean radiator.
Fan belt is worn or faulty - Replace the fan belt.
Engine overloaded - Load reducing is recommended.

Oil pressure too low
Low crankcase oil level - Add oil to the engine crankcase.
Oil filter clogged - Service or change engine oil filter element.
Incorrect engine oil Drain crankcase and refill with correct oil.
Crankshaft bearing oil clearance is excessive - Replace bearings.
Oil pump failure - Install a new pump.

Engine knocking sound or abnormal noise
Engine oil level low - Add oil to the engine crankcase.
Engine not warmed up - Warm up engine as required.
Fuel injection pump timing is not adjusted - Adjust fuel injection pump as required.
Improperly adjusted low idle speed - Adjust low idling as recommended.
Dirty or defective injectors - Clean or replace fuel injectors.
Misaligned or faulty connecting rod - Align or change connecting rod.
Worn or broken pistons - Have pistons replaced.

Drive System Troubleshooting

Drive system does not work in either direction
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.
Drive chain is damaged - Check drive chain and change defective components.
Worn or damaged relief valve - Repair or replace.
Dirty hydraulic filter or suction line - Service suction line or change hydraulic filter.
Foot or hand controls are damaged - Replace or repair.
Worn drive motor or pump - Inspect and replace as necessary.

Low power
Dirty hydraulic oil filter - Change or service hydraulic filter.
Defective or open relief valve - Close or change relief valve.
Transmission parts are faulty or damaged - Inspect and change faulty parts.
Input drive shaft failure - Replace drive shaft.
Hydraulic system is leaking air - Need to bleed air.

Drive system keeps overheating
Hydraulic fluid is insufficient - Add fluid as required.
Hydraulic fluid filter is clogged - Replace or service hydraulic filter.
Worn or defective relief valve - Repair or replace.
Drive pump or hydraulic motor malfunction - Inspect and change as required.
Clogged hydraulic oil cooler - Cooling fins should be cleaned.
Drive system overloaded continuously - Load should be reduced.

Drive system makes excessive noise
Oil viscosity is incorrect - Drain and refill with proper oil.
Air in the hydraulic system - Bleed hydraulic system.
Defective drive pump or hydraulic motor - Change or repair faulty component.
Mechanical parts of drive system are worn or damaged - Inspect drive system and replace faulty components.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not correct - Set pressure correctly.
Unadjusted or defective main relief valve - Set up or change the relief valve.
Dirty hydraulic oil - Change hydraulic oil.
Lack of hydraulic fluid - Check and refill the hydraulic fluid.
Hydraulic pump is defective - Install new pump or repair it.

Boom does not raise or lower
Defective lift controls - Inspect and repair if necessary.
Damaged hydraulic oil pump - Install new pump or repair it.
Hydraulic control valve is defective - Replace or repair the valve.
Hydraulic cylinder is defective - Repair or change hydraulic cylinder.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.

Bucket can't tilt
Bucket tilt controls are damaged - Repair or change.
Defective hydraulic pump - Install new pump or repair it.
Faulty hydraulic control valve - Repair or replace the valve.
Broken bucket cylinder - Install a new cylinder or repair it.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.

Bucket or lift arm is working slowly
Faulty hydraulic oil pump - Check the pump performance and replace it if required.
Oil leaks from hydraulic cylinder - Install new cylinder seals.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.
Faulty or incorrect setting hydraulic control valve - Adjust correctly or repair.
Hydraulic system loosing pressure - Adjust it correctly.

Bucket or boom is jerky
Air in hydraulic system - Air bleeding is required.
Hydraulic oil filter element is dirty - Clean or replace the filter.
Hydraulic fluid contamination - The fluid must be changed.
Cylinder rod or tube is scuffed - Change defective component.

Hydraulic pump makes excessive noise
Insufficient oil level or leaking hydraulic system - Top up hydraulic oil or remedy leakage in system.
Hydraulic filter clogging - Change or clean oil filter.
Suction line clogging - Suction line needs to be cleaned.
Air enters the pump - Bleed air.
Pump components are faulty - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery won’t charge
Loose or corroded wire connections - Clean or tighten wiring connections.
Defective battery terminal clamps - Install new terminal clamps.
Battery failing - Install a new battery.
Worn or loose belt - Change belt or adjust belt tension.

Starter turning slow
Low battery capacity - Battery is drained, charge it.
Battery drains quickly - Service or replace the battery.
Corroded battery terminals or disconnected wires - Connect wiring properly or install new terminals.

Starter does not work
Battery is low or faulty - Need to charge or replace the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output - Low battery charging, charge as required.
Starter motor failure - Repair or change starter.