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New Holland L785 Troubleshooting

The New Holland L785 skid steer loader is powered by 204 cu.in (3.3L) Perkins 4.2032 4-cylinder liquid-cooled diesel engine with a rated power of 57 hp (42.5 kW) at 2300 rpm. The New Holland L785 is equipped with a radial-lift boom, one-speed or two-speed hydrostatic transmission, ASA 80 drive chains, and 12x16.5 standard tires. The hydraulic system has a pump with fluid flow rate of 16 gpm (60.6 lpm). The hydraulic pressure is 2600 psi (176 bar). The skid steer loader has a rated operating capacity of 2050 lbs (930 kg) and tipping load of 4100 lbs (1860 kg). The lift height is 121.5 inches (3085 mm) to hinge pin, and dump height is 99 inches (2515 mm).

Engine Troubleshooting

Engine hard to start or doesn't start
Air trapped in fuel system - Bleed air.
Fuel filter element is dirty - Service the filter.
Burnt or defective injection nozzle - Change fuel injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is wrong - Correct valve clearance needs to be set.
Fuel injection pump is damaged - Install a new fuel pump or repair.

Diesel starts and suddenly stops
Air filter is dirty - Clean or change filter.
Fuel filter element is dirty - Install new filter element.
Fuel injection pump is leaking - Repair any leaks.
Defective or clogged fuel injectors - Inspect fuel injectors and change as required.
Fuel injection pump malfunctioning - Install a new fuel pump or repair.

Engine stops running suddenly
Engine is cold -Warm up the engine as required.
Fuel filter plugging - Change filter element.
There is air in the fuel system - Bleed the system.
Faulty fuel injection nozzles - Check injection nozzles and replace if required.
Incorrect adjustment of fuel injection pump timing - Set the fuel pump timing correctly.

Engine stalls while idle
Low idle speed setting is incorrect - Test and adjust.
Fuel injection pump is damaged - Replace injection pump or repair it.
Clogged or defective injectors - Clean or replace fuel injectors.
Improper valve clearance - Adjust valve clearance.

Engine lacks power
Dirty air cleaner - Clean or change.
Fuel injection nozzles are faulty or clogged - Install a new kit of correctly balanced nozzles.
Insufficient fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
Valve clearance is out of adjustment - Check and adjust.
Incorrect low idle setting - Adjust the low idle speed.
Fuel hoses or lines are dirty - Service fuel hoses and lines.
Cylinder-head gasket is broken - Change cylinder head gasket.
Piston rings are worn or damaged - Piston rings need to be replaced.

Engine overheated
Insufficient coolant fluid - Fill radiator to proper level and check components for faults.
Engine oil level low - Fill the crankcase with engine oil.
Radiator core is clogged or radiator cap is leaking - Clean radiator or replace cap.
Broken or loose fan belt - Replace the fan belt.
Diesel engine overloaded - Load reducing required.

Oil pressure is low
Engine oil insufficient - Check and refill the oil.
Dirty oil filter element - Replace or service engine oil filter.
Oil grade or viscosity is incorrect - Fill up with the correct oil viscosity.
Main bearing oil clearance is excessive - Bearing replacement required.
Defective oil pump - Install a new pump.

Engine noises or knocks
Engine oil insufficient - Fill up the engine oil.
Engine not warmed up - Warm up to required temperature.
Timing of fuel injection pump is incorrect - Set up as recommended.
Incorrect low idle setting - Adjust low idling as recommended.
Dirty or defective injectors - Change or clean fuel injectors.
Connecting rod is not aligned or worn - Need to replace or align the connecting rod.
Piston wear or scoring - Replace the pistons as required.

Drive System Troubleshooting

Drive system will not operate in either direction
Hydraulic oil level is low - Check and refill the hydraulic oil.
Drive chain is worn - Inspect drive chain and replace defective parts.
Worn or damaged relief valve - Change or repair defective relief valve.
Suction line or hydraulic filter is clogged - Replace hydraulic filter or clean suction line.
Worn or damaged foot or hand controls - Replace or repair.
Drive motor or pump is worn - Replace or repair faulty component.

Power is too low
Hydraulic oil filter is clogged - Replace or clean hydraulic filter.
Opened or worn relief valve - Replace or close relief valve.
Worn or faulty transmission components - Inspect and replace faulty parts.
Stuck input drive shaft - Service or change faulty drive shaft.
Air trapped in hydraulic system - Bleed hydraulic system.

Overheated drive system
Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.
Hydraulic fluid filter is clogged - Replace hydraulic filter.
Relief valve is not working correctly - Repair or replace.
Hydraulic motor or drive pump is defective - Inspect and change as required.
Plugged hydraulic oil cooler - Clean the cooling fins.
Drive system is overloaded - Load needs to be reduced.

Drive system makes excessive noise
Improper oil viscosity - Drain and refill with correct oil.
There is air in the hydraulic system - Air bleeding is required.
Worn hydraulic motor or drive pump - Replace or repair faulty component.
Mechanical components of drive system are worn or damaged - Inspect the parts for defect or damage and repair as required.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure is incorrect - Adjust pressure as required.
Faulty or improperly adjusted main relief valve - Adjust or replace the relief valve.
Dirty hydraulic oil - Change hydraulic oil.
Hydraulic oil level is insufficient - Fill up the hydraulic oil.
Faulty hydraulic oil pump - Replace or repair pump if necessary.

Boom fails to lift or drop
Lift controls are defective - Repair or replace.
Defective hydraulic pump - Repair or install new hydraulic pump.
Hydraulic control valve failure - Replace or repair the valve.
Broken hydraulic cylinder - Repair or replace hydraulic cylinder.
Low hydraulic oil level - Check and refill the hydraulic oil.

Bucket can't tilt
Faulty bucket tilt controls - Check and repair as required.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Damaged hydraulic control valve - Repair or replace the valve.
Hydraulic bucket cylinder not working - Replace or repair cylinder.
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.

Boom or bucket runs slowly
Faulty hydraulic oil pump - Test the pump performance and change pump if required.
Hydraulic cylinder leaking - Replace cylinder piston seals.
Insufficient hydraulic oil - Need to add oil.
Damaged or incorrect adjusted hydraulic control valve - Repair or set correctly.
Hydraulic pressure has dropped - Adjust pressure correctly.

Lift arm or bucket is jerky
Hydraulic system is leaking air - Bleed air from system.
Plugged hydraulic oil filter - Clean or install new filter.
Hydraulic oil contamination - Fill up with fresh hydraulic oil.
Cylinder rod or tube is scratched - Change damaged component.

Hydraulic pump is excessively noisy
Lack of oil or hydraulic leakage - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter clogging - Service or change hydraulic filter.
Plugged suction line - Suction line must be serviced.
Pump is sucking air - Bleed air.
Damaged pump components - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery cannot be charged
Loose or corroded cable connections - Tighten or service cable connections.
Battery terminal connectors are faulty - Terminal connectors should be replaced.
Battery failing - Change the battery.
Belt is loose or defective - Belt needs to be adjusted or replaced.

Starter motor turns slow
Low battery capacity - Battery needs to be recharged.
Battery will not hold charge - Service or replace the battery.
Bad terminals or disconnected battery cables - Connect wiring correctly or install new terminals.

Starter doesn't crank
Battery is low or faulty - Need to charge or replace the battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Low battery power - Charge the battery.
Starter motor failure - Starter needs to be replaced.