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Bobcat M600 Troubleshooting

The Bobcat M600 skid steer loader driveline system components: a 107.7 cu.in (1.8L) Wisconsin VF4D 4-cycle 4-cylinder gasoline or LPG engine with a rated power of 25 hp (18.6 kW), and variable sheave transmission. The hydraulic system has a pump with a rated capacity of 9.5 gal/min (36 l/min). The system relief pressure is 1700 psi (117 bar). The Bobcat M600 is equipped with a radial-lift loader boom, 60H drive chains, and 7.00x15 standard tires. The skid steer loader has a max lift height of 108" (2745 mm) to hinge pin and dump height of 86" (2185 mm). The rated operating capacity is 1000 lbs (454 kg), and tipping load is 1990 lbs (905 kg).

Engine Troubleshooting

Engine starts up hard or won't start
Fuel tank is empty - Add gasoline.
Low-quality gasoline - Use quality fuel.
Air in the fuel system - Air bleeding.
Loose or disconnected spark plug wire - Check spark plug wiring connection, repair or change.
Spark plug is damaged - Replace spark plug.
Ignition system failure - Inspect ignition system and change failed components.
Fuel filter is clogged - Fuel filter needs changing.
Restricted fuel lines - Fuel lines need to be cleaned.
Fuel pump is defective or dirty - Clean or install new fuel pump.
Carburetor malfunction - Check and repair as required.
Bad compression - Check and change damaged parts.

Engine runs unevenly
Ignition system failure - Inspect ignition system and change faulty parts.
Air filter element is plugged - Clean or change.
Faulty spark plug - Spark plug need to be replaced.
Fuel pump is dirty or defective - Test fuel pump and replace if necessary.
Improper valve clearance - Adjust to proper valve clearance.
Incorrect ignition timing - Ignition timing needs to be adjusted correctly.
Incorrectly set low idle speed - Correct the settings.

Engine starts and stalls suddenly
Spark plug is defective - Spark plug need to be replaced.
Carburetor is faulty or dirty - Carburetor needs to be replaced or cleaned.
Faulty ignition coil - Ignition coil should be replaced.
Loose or broken valve springs - Install new valve springs.
Valves sticking - Service the valves.

Engine keeps overheating
Engine oil level low - Fill up the engine oil.
Excessive engine load - Reduce the load.
Carburetor is running lean - Adjust carburetor correctly.
Wrong ignition timing - Ignition timing needs to be adjusted correctly.
Valve setting is wrong - Valves needs to be set correctly.
Defective radiator cap or clogged radiator core - Clean radiator or change cap.
Lack of coolant in cooling system - The cooling system needs to be refilled and checked for faults.
Defective thermostat - Thermostat need to be replaced.
Defective water pump - Change water pump as required.

Engine knocking or noise
Stale fuel - Change gasoline.
Excessive engine load - Reduce load.
Engine oil level is low - Fill up the oil to required level.
Low idle speed setting is incorrect - Test and adjust.
Fuel pump is dirty or defective - Inspect fuel pump and change as required.
Main bearings or crankshaft failure - Replace crankshaft or bearings.
Valve clearance is not correct - Check and adjust.
Worn cylinder bore or piston rings - Replace defective components.

Engine power is insufficient
Dirty or improperly adjusted carburetor - Service or properly adjust carburetor.
Air filter element is clogged - Change or clean air filter.
Fuel pump is faulty or clogged - Check fuel pump and replace if necessary.
Ignition system is defective - Inspect ignition system and change faulty parts.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Valves are stuck or burned - Change or clean valves.
Cylinder block components are faulty - Change defective parts.
Oil filter is dirty - Replace or service oil filter.

High fuel consumption
Clogged air filter - Change or clean air filter.
Carburetor main jet adjustment is improper - Adjust the carburetor main jet properly.
Spark plug is loose or defective - Tighten or replace spark plug.
Ignition timing is incorrect - Set the ignition timing correctly.
Burned, worn, or stuck valves - Replace or clean valves.
Worn sleeve, rings, or piston - Change defective parts.
Valve clearance is improper - Need to adjust valve clearance.
Low engine compression - Inspect cylinder block and change defective components.

Engine using too much oil
Damaged seals or gaskets - Change worn parts according to specifications.
Worn valve stems and valve guides - Need to replace the valves.
Stuck or worn piston rings - Install new piston rings.
Piston or cylinder liner is worn - Check piston and liner, change as required.

Engine backfires
Too lean carburetor mixture - Use proper settings.
Clogged fuel lines - Fuel lines need to be cleaned.
Bad ignition timing - Set the ignition timing properly.
Wrong valve setting - Set the valves correctly.
Dirty air filter element - Service or change air filter.

Drive System Troubleshooting

Machine will not move in either direction or one direction
Hydraulic oil is insufficient - Need to add oil.
Relief valve is not working correctly - Repair or change.
Plugged suction line or hydraulic filter - Change hydraulic filter or service suction line.
Foot or hand controls are faulty - Repair or replace.
Transmission components are worn or defective - Check and repair if required.

Loss of power
Clogged hydraulic oil filter - Replace or service hydraulic filter.
Relief valve is open or worn - Change or close relief valve.
Transmission components are worn or defective - Inspect and replace faulty parts.
Air in hydraulic system - Bleed air from system.

Drive system overheats
Hydraulic oil level is low - Need to add oil.
Hydraulic fluid filter is dirty - Replace hydraulic filter.
Relief valve is stuck - Change or repair defective relief valve.
Drive system is overloaded - Load needs to be reduced.

Drive system is noisy
Oil viscosity is wrong - Use correct oil viscosity.
Air in hydraulic system - Need to bleed air.
Transmission or clutch are worn - Change or repair faulty component.
Defective or worn mechanical components of drive system - Check the components for worn or defect and replace if necessary.

Hydraulics Troubleshooting

Hydraulic system is overheated
Hydraulic pressure is not adjusted correctly - Adjust pressure correctly.
Main relief valve is defective or unadjusted - Adjust relief valve or change if required.
Dirty hydraulic oil - Fill up with fresh hydraulic oil.
Lack of hydraulic fluid - Check and refill the hydraulic fluid.
Hydraulic pump is defective - Replace or repair pump if necessary.

Lift arm fails to drop or lift
Lift controls are defective - Change or repair.
Hydraulic pump malfunction - Replace or repair pump if necessary.
Defective hydraulic control valve - Replace or repair the valve.
Hydraulic cylinder failure - Install a new boom cylinder or repair it.
Hydraulic fluid is insufficient - Add fluid as required.

Bucket won't move
Bucket tilt controls are defective - Check and repair as required.
Hydraulic pump not working - Repair or replace pump if necessary.
Faulty hydraulic control valve - Install a new valve or repair it.
Hydraulic bucket cylinder is defective - Install a new cylinder or repair it.
Low hydraulic oil level - Fill the system to proper hydraulic oil level.

Bucket or lift arm moves slowly
Faulty hydraulic oil pump - Flow-rate pump and change pump if necessary.
Hydraulic cylinder oil leakage - Replace cylinder piston seals.
Hydraulic fluid level low - Fill up the hydraulic fluid.
Hydraulic control valve is defective or set improper - Repair or adjust correctly.
Hydraulic pressure is low - Set pressure correctly.

Bucket or boom is moving jerkily
Hydraulic system is leaking air - Bleed air from system.
Hydraulic oil filter element clogging - Replace or clean the filter.
Hydraulic fluid contamination - Change hydraulic fluid.
Cylinder tube or rod is scored - Change failed component.

Hydraulic pump makes excessive noise
Insufficient oil level or leaking hydraulic system - Correct hydraulic leaks or top up oil as needed.
Plugged hydraulic filter - Change or clean oil filter.
Dirty suction line - Suction line needs to be cleaned.
Air in hydraulic pump - Air bleeding is required.
Faulty pump parts - Install new hydraulic pump or rebuild it.

Electrical Troubleshooting

Battery is not charging
Corroded or loose wire connections - Clean or tighten connections.
Faulty battery terminal clamps - Terminal clamps need to be replaced.
Battery dead cell - Battery change required.
Worn or loose belt - Install a new belt or adjust belt tension.

Starter motor turns slow
Battery capacity is low - Battery needs to be recharged.
Battery does not hold charge - Service charging system or install new battery.
Corroded battery terminals or disconnected wires - Check wire connections and change or service terminals.

Starter does not work
Battery is discharged or defective - Charge or change the battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Low battery voltage - Charge the battery.
Starter motor is defective - Starter should be changed.