| Home / Skid Steer Loaders / John Deere Skid Steer Loaders / John Deere 6675 |
John Deere 6675 Troubleshooting
The
John Deere 6675 skid steer loader is powered by 124 cu.in (2 L) Yanmar 4TNE84
4-cycle 4-cylinder water-cooled diesel engine with a rated power of 42 hp (31
kW) at 3000 rpm. The John Deere 6675 is equipped with a vertical-lift loader
boom, 1-speed hydrostatic transmission, heavy-duty drive chains, and 10.00x16.5
standard tires. The hydraulic system has a pump with fluid flow rate of 15 gpm
(56 lpm). The hydraulic pressure is 2750 psi (190 bar). The skid steer loader
has a rated operating capacity of 1670 lbs (760 kg) and tipping load of 3350 lbs
(1525 kg). The lift height is 115.5 inches (2935 mm) to hinge pin, and dump
height is 90.4 inches (2295 mm).
| Engine Troubleshooting |
Engine difficult to start or will not start
Air in fuel system - Bleed fuel system.
Dirty fuel filter - Clean the filter or install new filter element.
Clogged or defective injection nozzles - Service or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Excessive valve clearance - Adjustment procedure required.
Defective fuel injection pump - Rebuild or replace pump.
Diesel starts but immediately stops
Clogged air filter - Service or replace the air filter.
Clogged fuel filter - Change filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Dirty or defective injectors - Test and replace fuel injectors if necessary.
Damaged fuel injection pump - Rebuild or install a new injection pump.
Engine shuts off while running
Engine is cold - Normalize the temperature by warming up the engine.
Fuel filter element is clogged - Clean or replace the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are clogged or faulty - Replace injection nozzles.
Improper fuel injection timing - Set up as recommended.
Engine stalls while idling
Low idle speed set incorrectly - Adjust the low idle speed.
Fuel injection pump is damaged - Repair or replace injection pump.
Defective fuel injectors - Test and replace fuel injectors if necessary.
Incorrect valve clearance - Adjust valve clearance according to specifications.
Engine power is too low
Plugged air filter - Clean or change.
Clogged injection nozzle - Replace injection nozzles.
Fuel injection pressure is incorrect - Test fuel injection pressure and adjust it correctly.
Valve clearance is out of adjustment - Check and adjust as required.
Low idle speed set incorrectly - Need to adjust idle speed.
Restricted fuel hoses or lines - Clean fuel hoses and lines.
Cylinder head gasket is blown - Cylinder-head gasket replacement required.
Leaking or defective piston rings - Change piston rings.
Engine overheated
Low coolant level - The cooling system needs to be refilled and checked for faults.
Insufficient engine oil - Fill up the engine oil.
Radiator core is clogged or radiator cap is leaking - Clean radiator or replace cap.
Fan belt is broken or worn - Belt change is required.
Engine is under excessive load - Load reducing is recommended.
Insufficient oil pressure
Lack of oil - Need to add oil.
Oil filter clogging - Replace or service engine oil filter.
Wrong oil viscosity - Use the specified type of engine oil.
Excessive main bearing oil clearance - Bearing replacement required.
Oil pump is defective - Replace as required.
Engine noise or knocking
Low engine oil level - Checking oil level and add if necessary.
Engine is cold - Normalize the temperature by warming up the engine.
Wrong setting of fuel injection pump timing - Adjust the pump as required.
Low idle speed set incorrectly - Normalize low idle speed.
Fuel injectors are faulty or clogged - Clean or replace fuel injectors.
Connecting rod is misaligned or worn - Need to change or align the connecting rod.
Pistons are broken or worn - Pistons replacement required.
| Drive System Troubleshooting |
Machine will not move in either direction or one direction
Hydraulic oil level is low - Need to add oil.
Drive chain malfunction - Check drive chain and change faulty components.
Relief valve is stuck - Repair or replace relief valve.
Hydraulic filter or suction line is plugged - Change hydraulic filter or service suction line.
Defective hand or foot controls - Repair or change.
Drive motor or pump is worn - Inspect and change as required.
Loss of power
Hydraulic oil filter is clogged - Change hydraulic filter.
Relief valve is damaged or open - Close or change relief valve.
Worn or faulty transmission components - Inspect and replace defective parts.
Input drive shaft is worn - Repair or replace faulty drive shaft.
Air trapped in hydraulic system - Bleed hydraulic system.
Drive system overheating
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.
Hydraulic fluid filter is dirty - Replace hydraulic filter.
Relief valve is worn or damaged - Repair or change.
Hydraulic motor or drive pump failure - Repair or replace faulty component.
Clogged hydraulic oil cooler - Cooling fins need to be cleaned.
Overloaded drive system - Load should be reduced.
Excessive noise
Wrong oil viscosity - Use oil of proper viscosity.
Air in the hydraulic system - Air bleeding is required.
Drive pump or hydraulic motor malfunction - Replace or repair faulty component.
Defective or worn mechanical components of drive system - Inspect the components for worn or defect and repair as required.
| Hydraulics Troubleshooting |
Hydraulic system overheated
Incorrect hydraulic pressure setting - Adjust pressure as required.
Misadjusted or defective main relief valve - Adjust or replace the relief valve.
Contaminated hydraulic oil - Change hydraulic oil.
Not enough hydraulic oil in the system - Add oil to the hydraulic system.
Hydraulic pump is faulty - Replace or repair pump if necessary.
Lift arm fails to drop or lift
Lift controls failure - Change or repair.
Defective hydraulic pump - Repair or change pump if required.
Defective hydraulic control valve - Repair or replace hydraulic valve.
Hydraulic cylinder is defective - Repair or change hydraulic cylinder.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Bucket is not working
Bucket tilt controls malfunction - Check and repair as required.
Hydraulic pump is broken - Repair or replace pump if necessary.
Hydraulic control valve malfunction - Repair or change hydraulic valve.
Damaged bucket cylinder - Repair or install a new cylinder.
Insufficient hydraulic oil - Need to add oil.
Slow bucket or lift arm operation
Hydraulic pump is worn - Test the pump performance and change pump if required.
Oil leaks from hydraulic cylinder - Cylinder seals need to be replaced.
Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is defective or set improper - Repair or set correctly.
Low hydraulic pressure - Adjust pressure as required.
Bucket or boom movements are jerky
Hydraulic system is leaking air - Air bleeding is required.
Plugged hydraulic oil filter - Clean or replace the filter.
Hydraulic fluid contamination - Hydraulic fluid change required.
Scratched cylinder rod or tube - Replace worn component.
Hydraulic pump is noisy
Hydraulic leakage or lack of oil - Refill hydraulic oil or repair leaks in system.
Hydraulic filter is dirty - Change or clean oil filter.
Suction line is clogged - Suction line needs to be cleaned.
Pump sucks air - Bleed air.
Worn pump parts - Change or rebuild pump.
| Electrical Troubleshooting |
Battery is not charging
Corroded or loose cable connections - Clean or tighten wiring connections.
Electrical terminal connectors are faulty - Replace terminal connectors.
Worn-out battery - Battery replacement required.
Belt is defective or loose - Adjust belt tension or install a new belt.
Starter cranks slowly
Battery capacity is low - Battery is drained, charge it.
Battery will not hold charge - Service battery or replace it.
Terminals are faulty or battery cables are disconnected - Check wire connections and change or service terminals.
Starter motor is not working
Battery is low or faulty - Charge or change the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output voltage - Charge the battery.
Starter motor failing - Replace or repair starter.
____________________________________________________________________________________
| SKID STEER LOADERS SPECIFICATIONS |