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New Holland L234 Troubleshooting

The New Holland L234 skid steer loader is powered by 207 cu.in (3.4L) FPT F5B FL413E four-cylinder turbocharged diesel engine with a rated power of 84 hp (63 kW) at 2500 rpm. The New Holland L234 is equipped with a vertical-lift loader boom, single-speed or two-speed hydrostatic transmission, ASA 100 drive chains, and 14x17.5 standard tires. The hydraulic system has a pump with fluid flow rate of 24.2 gpm (91.5 lpm) or 37.6 gpm (142.5 lpm). The skid steer loader has a rated operating capacity of 3400 lbs (1540 kg) and tipping load of 6800 lbs (3080 kg). The lift height is 131.1 inches (3325 mm) to hinge pin, and dump height is 104.5 inches (2655 mm).

Engine Troubleshooting

Engine starts up hard or won't start
There is air in the fuel system - Bleed the system.
Fuel filter element clogging - Clean or replace the filter.
Burnt or clogged injection nozzle - Replace injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is wrong - Need to adjust valve clearance.
Fuel injection pump is not working correctly - Rebuild or replace pump.

Diesel starts but immediately stops
Dirty air filter - Clean or change.
Fuel filter element clogging - Replace filter element.
Fuel injection pump has loose connections - Tighten the connections.
Damaged or clogged injectors - Replace or clean fuel injectors.
Fuel injection pump malfunctioning - Install a new pump or rebuild.

Engine stops unexpectedly during operation
Engine is cold - Warm up to required temperature.
Dirty fuel filter - Service or replace the filter.
Air in the fuel system - Air bleeding.
Defective or clogged injection nozzle - If necessary, replace with a new nozzle.
Improper fuel injection timing - Set it up as required.

Engine stops when idling
Improperly adjusted low idle speed - Test and adjust.
Fuel injection pump is damaged - Replace or rebuild injection pump.
Damaged or clogged injectors - Change or clean fuel injectors.
Excessive valve clearance - Adjustment procedure required.

Engine lacks power
Dirty air filter - Install new air filter element.
Fuel injection nozzles are damaged - Check injection nozzles and replace if required.
Fuel injection pressure is incorrect - Test fuel injection pressure and adjust it correctly.
Valve clearance is out of adjustment - Adjust valve clearance according to specifications.
Incorrect low idle speed adjustment - Adjust as required.
Clogged fuel hoses or lines - Clean fuel system hoses and lines.
Damaged cylinder-head gasket - Replace the gasket as required.
Worn or damaged piston rings - Install new piston rings.

Engine overheats
Insufficient coolant fluid - Top up coolant fluid and check system for leaks.
Engine oil level is insufficient - Need to add engine oil.
Faulty radiator cap or dirty radiator fins - Install new cap or clean radiator.
Fan belt slipping or worn - Replace the fan belt.
Engine is under excessive load - Reduce load on the engine.

Oil pressure is low
Engine oil level low - Fill up the engine oil.
Plugged engine oil filter - Service or replace engine oil filter.
Incorrect engine oil Drain crankcase and refill with correct oil.
Crankshaft bearing oil clearance is excessive - Change bearings.
Oil pump malfunction - Install a new pump.

Engine knocking or noise
Engine oil level is low - Need to add engine oil.
Engine has not warmed up to the recommended temperature - Warm up the engine.
Fuel injection pump timing is wrong - Set up as recommended.
Low idle speed setting is not correct - Adjust as required.
Fuel injectors are faulty or clogged - Clean fuel injectors or change it.
Faulty or misaligned connecting rod - Alignment procedure or replacement is required.
Pistons are worn or broken - Install new pistons.

Drive System Troubleshooting

Drive system will not operate in either direction
Insufficient hydraulic oil - Check and refill the hydraulic oil.
Faulty drive chain - Inspect drive chain and replace defective parts.
Relief valve is stuck - Change or repair defective relief valve.
Dirty hydraulic filter or suction line - Change hydraulic filter or service suction line.
Worn or defective hand or foot controls - Change or repair.
Drive pump or motor is damaged - Replace or repair faulty component.

Power is too low
Plugged hydraulic oil filter - Replace or clean hydraulic filter.
Relief valve is damaged or open - Close or change relief valve.
Transmission parts are defective or worn - Inspect and replace faulty parts.
Input drive shaft is damaged - Change or repair faulty drive shaft.
Air in hydraulic system - Air bleeding is required.

Overheated drive system
Low hydraulic fluid level - Add fluid as required.
Hydraulic fluid filter is clogged - Change or service hydraulic filter.
Defective relief valve - Relief valve need to be replaced or repair.
Defective drive pump or hydraulic motor - Inspect and replace as necessary.
Clogged hydraulic oil cooler - Cooling fins should be cleaned.
Drive system overloaded continuously - Reduce drive system load.

Drive system is excessively noisy
Wrong oil viscosity - Use correct oil viscosity.
There is air in the hydraulic system - Need to bleed air.
Drive pump or hydraulic motor malfunction - Check and repair if required.
Worn or damaged mechanical parts of drive system - Check the components for defect or damage and change if necessary.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure is not adjusted correctly - Adjust it correctly.
Faulty or improperly adjusted main relief valve - Adjust the valve or replace if necessary.
Hydraulic fluid is contaminated - Change hydraulic fluid.
Hydraulic fluid level is low - Add fluid to the hydraulic system.
Hydraulic pump is worn - Repair or replace pump if necessary.

Lift arm fails to drop or lift
Lift controls are faulty - Replace or repair.
Hydraulic pump failure - Change or repair hydraulic pump if required.
Defective hydraulic control valve - Install a new valve or repair it.
Hydraulic cylinder not working - Repair or install a new lift cylinder.
Insufficient hydraulic fluid - Add fluid as required.

Bucket is not working
Bucket tilt controls malfunction - Replace or repair.
Hydraulic pump is broken - Repair or replace pump if necessary.
Defective hydraulic control valve - Change or repair hydraulic valve.
Bucket cylinder malfunction - Change or repair cylinder.
Hydraulic oil level low - Check and refill the hydraulic oil.

Boom or bucket runs slowly
Hydraulic pump is faulty - Check pump flow and change pump if necessary.
Leaking hydraulic cylinder - Change cylinder piston seals.
Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.
Faulty or incorrect setting hydraulic control valve - Set properly or repair.
Low hydraulic pressure - Adjust pressure as required.

Jerky operation of the bucket or boom
Air leaks in hydraulic system - Bleed air from system.
Hydraulic oil filter element is clogged - Replace or clean the filter.
Contaminated hydraulic fluid - Hydraulic fluid change required.
Scratched cylinder rod or tube - Replace worn component.

Excessive hydraulic pump noise
Hydraulic system leaking or not enough oil - Top up hydraulic oil or remedy leakage in system.
Plugged hydraulic filter - Change or clean oil filter.
Suction line clogging - Clean suction line as required.
Air trapped in hydraulic pump - Need to bleed air.
Worn pump components - Rebuild or install new pump.

Electrical Troubleshooting

Battery cannot be charged
Electrical wire connections are loose or corroded - Service or tighten cable connections.
Battery terminal connectors are faulty - Terminal connectors should be replaced.
Battery bad cell - Install a new battery.
Belt is worn or loose - Belt needs to be adjusted or replaced.

Starter motor cranks slow
Low battery capacity - Charge the battery.
Battery is draining quickly - Service battery or replace it.
Faulty battery terminals or disconnected cables - Connect cables properly or replace terminals.

Starter motor won't turn
Battery is discharged or defective - Recharge or replace battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery output - Battery is drained, charge it.
Starter motor failure - Starter should be replaced.