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Home / Wheel Loaders / Doosan Wheel Loaders / Doosan DL350-5

Doosan DL350-5 Troubleshooting

The Doosan DL350-5 wheel loader driveline system components: Scania DC9 five-cylinder direct injection turbocharged liquid-cooled diesel engine with a rated power of 271 hp (202 kW), and powershift transmission with 5 forward and 3 reverse gears. The hydraulic system has a pump with a rated capacity of 76.5 gal/min (290 l/min). The Doosan DL350-5 is equipped with a power steering system, hydraulic dual multi-disc brakes, and 23.5R25 tires. The wheel loader has a maximum lift height of 164.2" (4170 mm) and bucket breakout force of 36785 lbs (16720 kg). The rated operating capacity is 15355 lbs (6980 kg), and tipping load is 30710 lbs (13960 kg).

Engine Troubleshooting

Engine hard to start or won't start
Air in fuel system - Bleed fuel system.
Fuel filter element clogging - Clean or change the filter.
Damaged or dirty injection nozzles - Inspect nozzles and replace if necessary.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve out of adjustment - Adjust valve clearance.
Fuel injection pump malfunctioning - Repair or install a new fuel pump.

Engine stalls after starting
Clogged air filter - Clean or replace element.
Fuel filter element is dirty - Install new filter element.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Dirty or defective injectors - Change or clean fuel injectors.
Fuel injection pump failure - Install a new fuel pump or repair.

Engine stalls after running
Engine not warmed up - Warm up to required temperature.
Fuel filter element clogging - Change filter element.
Air in the fuel system - Air bleeding.
Damaged or dirty injection nozzles - Clean or replace injection nozzles.
Fuel injection pump timing is wrong - Adjust fuel injection pump as required.

Engine shuts off while idling
Low idle speed setting is incorrect - Correct low idle settings.
Fuel injection pump is not operating properly - Replace or repair injection pump.
Dirty or defective injectors - Replace fuel injectors.
Improper valve clearance - Correct valve clearance needs to be set.

Low engine power
Plugged air cleaner - Clean or change cleaner.
Fuel injection nozzles are damaged or dirty - Test injection nozzles and change if necessary.
Incorrect fuel injection pressure - Adjust to proper pressure.
Valve clearance is not correct - Correct valve clearance.
Low idle speed adjustment is incorrect - Adjust as required.
Fuel lines or hoses are dirty - Clean fuel lines and hoses.
Cylinder head gasket is blown - Change cylinder head gasket.
Leaking or defective piston rings - Install new piston rings.

Engine overheats
Low coolant level - Fill the cooling system and check components for leaks or other faults.
Engine oil level low - Check oil level and add oil as required.
Faulty radiator cap or dirty radiator fins - Change cap or clean radiator.
Broken or loose fan belt - The fan belt needs to be replaced.
Diesel engine overloaded - Load reducing is recommended.

Low oil pressure
Lack of oil - Add oil to the engine crankcase.
Oil filter element clogged - Change or service engine oil filter.
Wrong oil viscosity - Fill up with the proper oil viscosity.
Incorrect oil clearance in crankshaft bearing - Bearing needs to be changed.
Oil pump is damaged - Install a new pump.

Engine noises or knocks
Insufficient engine oil - Fill up the oil to required level.
Engine is not preheated - Warm up the engine.
Fuel injection pump timing is wrong - Adjust according to specifications.
Improperly adjusted low idle speed - Adjust low idle speed.
Fuel injector fault - Change or clean fuel injectors.
Connecting rod failure or misalignment - Connecting rod needs to be replaced or aligned.
Broken or worn pistons - Replace the pistons as required.

Transmission Troubleshooting

Transmission oil pressure is insufficient
Transmission oil insufficient - Check and refill the transmission oil.
Transmission fluid filter element clogging (if equipped) - Service or replace the transmission fluid filter.
Relief valve malfunction - Install a new valve.

Transmission makes excessive noise
Lack of transmission oil supply - Fill the transmission housing to proper oil level.
Transmission oil contamination - Fill up with fresh transmission oil.
Worn gears or incorrect backlash - Adjust backlash properly or replace the gears.
Worn or damaged bearings - Bearings replacement required.
Worn or bent gear shift forks - Install new shift forks.
Damaged or worn shaft splines - Change defective shaft.

Hard shifts
Stuck or worn gear shift linkage - Lubricate or replace shift linkage.
Shift forks are worn or bent - Replace the shift forks.
Gearshift mechanism is damaged - Replace or repair the mechanism.
Clutch is faulty or misadjusted - Adjust correctly or replace.

Transmission fluid leakage
Transmission fluid level is high - Correct the fluid level.
Seals or gaskets are broken - Gaskets or seal need to be replaced.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not correct - Adjust pressure as required.
Faulty or improperly adjusted main relief valve - Adjust or change relief valve.
Dirty hydraulic fluid - Fill up with fresh hydraulic fluid.
Hydraulic oil level is insufficient - Fill up the hydraulic oil.
Faulty hydraulic oil pump - Replace or repair pump if necessary.

Lift arm does not lower or raise
Defective lift controls - Repair or change.
Defective hydraulic pump - Repair or replace pump if necessary.
Damaged hydraulic control valve - Repair or replace hydraulic valve.
Damaged hydraulic cylinder - Replace or repair boom cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Bucket won't move
Damaged bucket controls - Inspect and repair if necessary.
Damaged hydraulic oil pump - Repair or replace pump if necessary.
Damaged hydraulic control valve - Repair or replace hydraulic valve.
Hydraulic bucket cylinder is defective - Repair or install a new cylinder.
Hydraulic oil level low - Fill the system to proper hydraulic oil level.

Bucket or lift arm moves slowly
Hydraulic pump is defective - Check pump flow and change pump if necessary.
Hydraulic cylinder leaking - Cylinder seals need to be replaced.
Hydraulic oil is insufficient - Need to add oil.
Hydraulic control valve is not set properly or defective - Repair or set correctly.
Hydraulic pressure has dropped - Correct setting is required.

Jerky operation of the bucket or boom
Air in the hydraulic system - Bleed hydraulic system.
Hydraulic oil filter clogging - Change or clean oil filter.
Hydraulic oil is dirty - Change hydraulic oil.
Cylinder rod or tube is scuffed - Replace damaged component.

Hydraulic pump is noisy
Hydraulic leakage or lack of oil - Correct hydraulic leaks or top up oil as needed.
Hydraulic filter clogging - Clean or replace the filter.
Clogged suction line - Need to clean the suction line.
Air enters the pump - Need to bleed air.
Pump components are faulty - Replace or rebuild the pump.

Electrical Troubleshooting

Battery will not charge
Electrical wire connections are loose or corroded - Clean or tighten connections.
Defective battery terminal connectors - Terminal connectors need to be changed.
Battery faulty cell - Battery change required.
Damaged or loose belt - Adjust belt tension or replace belt.

Starter motor cranks slow
Low battery capacity - Battery is drained, charge it.
Battery is not holding charge - Service or change the battery.
Terminals are faulty or battery cables are disconnected - Check cable connections and replace or service terminals.

Starter motor is not working
Battery is discharged or defective - Battery needs to be recharged or replaced.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery output voltage - Recharge the battery.
Starter motor failure - Starter should be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders