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John Deere 8875 Troubleshooting
The
John Deere 8875 skid steer loader driveline system components: John Deere 3029T
3-cylinder turbocharged liquid-cooled diesel engine with a rated power of 61 hp
(45.5 kW), and 2-speed hydrostatic transmission. The hydraulic system has a pump
with a rated capacity of 17.6 gal/min (66.7 l/min). The system relief pressure
is 2600 psi (180 bar). The John Deere 8875 is equipped with vertical-lift loader
boom, heavy-duty drive chains, and 12.00x16.5 tires. The loader has a boom
breakout force of 6280 lbs (2850 kg) and bucket breakout force of 5200 lbs (2360
kg). The rated operating capacity is 2350 lbs (1070 kg), and tipping load is
4700 lbs (2140 kg).
| Engine Troubleshooting |
Engine starts up hard or doesn't start
Air in the fuel lines - Bleed the fuel lines.
Dirty fuel filter - Service the filter.
Dirty or faulty injection nozzles - Check and replace nozzles if required.
Water in the fuel system - Change fuel and repair fuel system.
The valve clearance is incorrect - Correct valve clearance.
Fuel injection pump malfunction - Replace or rebuild injection pump.
Engine stalls after starting
Plugged air filter - Replace or clean air filter element.
Fuel filter element is clogged - Change the filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Dirty or defective injectors - Clean or replace fuel injectors.
Faulty fuel injection pump - Repair or replace injection pump.
Engine stops running suddenly
Low coolant temperature - Normalize the temperature by warming up the engine.
Dirty fuel filter - Clean or replace the filter.
There is air in the fuel system - Bleed the system.
Fuel injection nozzles fault - Change fuel injection nozzles.
Improper setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Engine stops when idle
Too low idle RPM - Correct low idle settings.
Fuel injection pump malfunctioning - Rebuild or install a new injection pump.
Fuel injector fault - Replace fuel injectors.
Improper valve clearance - Correct valve clearance needs to be set.
Low engine power
Air cleaner is clogged - Clean or replace element.
Dirty or faulty injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel injection pressure is incorrect - Adjust pressure to proper level.
Excessive valve clearance - Check and adjust as required.
Incorrectly set low idle speed - Adjust low idling as recommended.
Restricted fuel lines or hoses - Clean fuel hoses and lines.
Blown cylinder head gasket - Replace cylinder head gasket.
Piston rings are leaking or defective - Install new piston rings.
Engine overheats
Low coolant level - Add coolant fluid and inspect the cooling system for leaks.
Low engine oil level - Need to add engine oil.
Faulty radiator cap or dirty radiator fins - Change cap or clean radiator.
Fan belt is worn or faulty - Replace the fan belt.
Diesel engine is overloaded - Reduce load on the engine.
Oil pressure is insufficient
Not enough oil in the engine - Check oil level and add oil as required.
Oil filter is dirty - Change or service engine oil filter.
Incorrect oil viscosity - Use oil of proper viscosity.
Incorrect crankshaft bearing oil clearance - Change bearings.
Oil pump is worn or damaged - Repair or replace.
Abnormal engine knocking or noise
Engine oil level is insufficient - Need to add engine oil.
Engine not warmed up - Warm up to required temperature.
Wrong setting of fuel injection pump timing - Adjust according to specifications.
Too low idle RPM - Adjust as required.
Fuel injector fault - Clean fuel injectors or change it.
Connecting rod misalignment or failure - Connecting rod needs to be aligned or changed.
Pistons are scored or worn - Replace the pistons.
| Drive System Troubleshooting |
Machine does not move forward or backward
Low hydraulic fluid level - Fill up the hydraulic fluid.
Drive chain failure - Inspect drive chain and replace defective parts.
Stuck relief valve - Repair or install a new relief valve.
Hydraulic filter or suction line is clogged - Check, clean, or change if necessary.
Hand or foot controls malfunction - Check and repair as required.
Defective drive pump or motor - Check and repair if required.
Reduced power
Clogged hydraulic oil filter - Check, clean, or replace as required.
Damaged or opened relief valve - Close or change relief valve.
Transmission components are faulty or damaged - Inspect and change faulty parts.
Input drive shaft is damaged - Change or repair faulty drive shaft.
Air trapped in hydraulic system - Bleed air from system.
Drive system overheats
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.
Clogged hydraulic fluid filter - Change hydraulic filter.
Stuck relief valve - Change or repair defective relief valve.
Drive pump or hydraulic motor is damaged - Inspect and change as required.
Clogged hydraulic oil cooler - Cooling fins need to be cleaned.
Drive system is overloaded - Load needs to be reduced.
Excessive noise
Oil viscosity is incorrect - Use oil of proper viscosity.
There is air in the hydraulic system - Need to bleed air.
Worn hydraulic motor or drive pump - Repair or change faulty component.
Worn or defective mechanical parts of drive system - Check the components for defect or damage and change if necessary.
| Hydraulics Troubleshooting |
Hydraulic system is overheated
Hydraulic pressure incorrectly adjusted - Adjust pressure correctly.
Main relief valve is damaged or adjusted improperly - Set up or change the relief valve.
Hydraulic oil is contaminated - The oil must be changed.
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required.
Faulty hydraulic oil pump - Repair or replace pump if necessary.
Boom won't lower or raise
Defective lift controls - Replace or repair.
Hydraulic pump not working - Repair or change pump if required.
Faulty hydraulic control valve - Repair or change hydraulic valve.
Hydraulic cylinder is defective - Replace or repair boom cylinder.
Hydraulic fluid is insufficient - Fill the system to proper hydraulic fluid level.
Bucket tilt does not work
Defective bucket controls - Repair or change.
Damaged hydraulic oil pump - Change or repair hydraulic pump if required.
Damaged hydraulic control valve - Change or repair hydraulic valve.
Faulty hydraulic bucket cylinder - Repair or install a new cylinder.
Insufficient hydraulic oil - Need to add oil.
Boom or bucket moves slowly
Hydraulic pump is worn - Check the pump performance and replace it if required.
Leaking hydraulic cylinder - Replace cylinder piston seals.
Hydraulic oil is insufficient - Check and refill the hydraulic oil.
Hydraulic control valve is faulty or out of adjustment - Repair or set properly.
Low hydraulic pressure - Correct adjustment is required.
Bucket or boom is jerky
There is air in the hydraulic system - Need to bleed air.
Hydraulic oil filter element is clogged - Service or change the hydraulic filter.
Dirty hydraulic fluid - The fluid must be changed.
Cylinder tube or rod is scored - Change defective component.
Hydraulic pump makes excessive noise
Lack of oil or hydraulic leakage - Refill hydraulic oil or repair leaks in system.
Hydraulic filter is clogged - Service or change hydraulic filter.
Clogged suction line - Need to service the suction line.
Pump sucks air - Remove air from hydraulics.
Pump components are faulty - Rebuild or change hydraulic pump.
| Electrical Troubleshooting |
Battery does not charge
Corroded or loose cable connections - Service or tighten cable connections.
Defective battery terminal clamps - Terminal clamps should be changed.
Faulty cell in battery - Replace the battery.
Loose or worn belt - Adjust belt tension or replace belt.
Starter cranks slow
Battery capacity is low - Charge the battery.
Battery runs out quickly - Service battery or replace it.
Disconnected wiring or bad battery terminals - Connect wires properly or change terminals.
Starter doesn't crank
Battery is drained or worn - 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 is defective - Starter should be replaced.
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| SKID STEER LOADERS SPECIFICATIONS |