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Bobcat 773 F-Series Problems

The Bobcat 773 F-Series skid steer loader is powered by Kubota V2203-EB 4-cylinder water-cooled diesel engine with a rated power of 46 hp (34 kW) at 2800 rpm. The Bobcat 773 is equipped with a vertical-lift loader boom, 1-speed hydrostatic transmission, 80HS drive chains, and 10.00x16.5 standard tires. The hydraulic system has a pump with fluid flow rate of 16.7 gpm (63 lpm) or 27 gpm (102 lpm). The hydraulic pressure is 3000 psi (207 bar). The skid steer loader has a rated operating capacity of 1750 lbs (795 kg) and tipping load of 3900 lbs (1770 kg). The lift height is 118.2 inches (3000 mm) to hinge pin, and dump height is 91 inches (2310 mm).

Engine Troubleshooting

Engine hard to start or will not start
Air in the fuel system - Air bleeding.
Clogged fuel filter - Install new filter element.
Damaged or dirty injection nozzles - Check and replace nozzles if required.
Water in the fuel system - Change fuel and repair fuel system.
Improper valve clearance - Need to adjust valve clearance.
Fuel injection pump is not working correctly - Change pump or rebuild it.

Engine stalls after starting
Dirty air filter - Clean or change filter.
Fuel filter plugging - Change or clean the filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Clogged or defective injectors - Clean fuel injectors or change it.
Fuel injection pump is broken - Install a new fuel pump or repair.

Engine shuts off while running
Engine not warmed up - Normalize the temperature by warming up the engine.
Fuel filter plugging - Clean or change the filter.
Air in fuel tank - Bleed fuel tank.
Clogged or burnt injection nozzle - Check and replace nozzles if required.
Timing of fuel injection pump is incorrect - Use the correct fuel injection pump timing adjustment.

Engine stalls at low idle speed
Low idle speed set incorrectly - Adjustment required.
Damaged fuel injection pump - Rebuild or change fuel pump.
Fuel injectors are dirty or defective - Test and replace fuel injectors if necessary.
The valve clearance is incorrect - Adjustment procedure required.

Engine power is insufficient
Clogged air cleaner - Clean or change cleaner.
Fuel injection nozzles are damaged - If necessary, replace with a new nozzle.
Incorrect fuel injection pressure - Correct the pressure settings.
The valve clearance is not adjusted - Check and adjust as required.
Too low idle RPM - Correct low idle adjustment.
Dirty fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Defective cylinder head gasket - Change cylinder head gasket.
Leaking or defective piston rings - Piston rings need to be replaced.

Engine is overheated
Lack of coolant in cooling system - The cooling system needs to be refilled and checked for faults.
Not enough engine oil - Check oil level and add oil as required.
Defective radiator cap or clogged radiator fins - Replace cap or clean radiator.
Fan belt slipping or worn - Change the fan belt.
Engine overload - Load reducing is recommended.

Oil pressure too low
Engine oil insufficient - Fill up the engine oil.
Clogged oil filter - Change or clean engine oil filter element.
Incorrect engine oil Use oil of proper viscosity.
Incorrect oil clearance in main bearing - Bearing needs to be changed.
Oil pump is worn or damaged - Replace as required.

Abnormal engine knocking or noise
Engine oil insufficient - Check and refill engine oil.
Engine not warmed up - Normalize the temperature by warming up the engine.
Timing of fuel injection pump is incorrect - Adjust as recommended.
Low idle speed setting is incorrect - Adjust low idle speed.
Dirty or defective injectors - Change or clean fuel injectors.
Connecting rod is worn or misaligned - Align or replace connecting rod.
Worn or broken pistons - Pistons replacement required.

Drive System Troubleshooting

Machine will not move in either direction or one direction
Hydraulic oil level is low - Checking hydraulic oil level and add if necessary.
Drive chain fault - Inspect drive chain and replace defective parts.
Relief valve is stuck - Repair or change.
Suction line or hydraulic filter is dirty - Clean suction line or change hydraulic filter.
Worn or defective hand or foot controls - Check and repair as required.
Drive pump or motor is damaged - Repair or replace faulty component.

Loss of power
Plugged hydraulic oil filter - Change or clean hydraulic filter.
Relief valve is defective or open - Close or replace relief valve.
Transmission parts are faulty or damaged - Check and change defective components.
Input drive shaft failure - Repair or replace faulty drive shaft.
Air leaks in hydraulic system - Need to bleed air.

Overheated drive system
Hydraulic oil level is low - Checking hydraulic oil level and add if necessary.
Dirty hydraulic fluid filter - Replace or clean hydraulic filter.
Worn or damaged relief valve - Repair or install a new relief valve.
Drive pump or hydraulic motor malfunction - Repair or replace faulty component.
Hydraulic oil cooler is plugged - Cooling fins should be cleaned.
Drive system overload - Reduce the load.

Excessive noise
Wrong oil viscosity - Drain and refill with proper oil.
Air in hydraulic system - Need to bleed air.
Hydraulic motor or drive pump is defective - Repair or replace faulty component.
Worn or damaged mechanical parts of drive system - Check the components for worn or defect and replace if necessary.

Hydraulics Troubleshooting

Hydraulic system is overheated
Hydraulic pressure incorrectly adjusted - Adjust pressure correctly.
Main relief valve is damaged or adjusted improperly - Adjust the valve or replace if necessary.
Dirty hydraulic oil - Hydraulic oil change required.
Hydraulic fluid level is insufficient - Fill the hydraulic system with oil.
Hydraulic pump is defective - Repair or change pump if required.

Lift arm does not lower or raise
Damaged lift controls - Replace or repair.
Hydraulic pump is broken - Replace or repair pump if necessary.
Defective hydraulic control valve - Change or repair hydraulic valve.
Faulty hydraulic cylinder - Repair or change hydraulic cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Bucket does not tilt
Bucket controls failure - Change or repair.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Defective hydraulic control valve - Install a new valve or repair it.
Damaged bucket cylinder - Repair or replace cylinder.
Hydraulic oil level low - Fill the system to proper hydraulic oil level.

Slow boom or bucket action
Hydraulic pump is defective - Check hydraulic pump flow and replace pump if necessary.
Hydraulic cylinder leaking - Replace cylinder piston seals.
Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.
Worn or unadjusted hydraulic control valve - Set correctly or repair.
Hydraulic pressure loss - Set pressure correctly.

Jerky operation of the bucket or boom
Air trapped in hydraulic system - Bleed hydraulic system.
Dirty hydraulic oil filter - Replace or clean the filter.
Hydraulic oil is dirty - The oil must be changed.
Cylinder tube or rod scoring - Change failed component.

Hydraulic pump is noisy
Insufficient oil level or leaking hydraulic system - Add hydraulic oil or correct system leaks.
Plugged hydraulic filter - Clean or change the filter.
Suction line clogging - Clean suction line as required.
Air in hydraulic pump - Need to bleed air.
Pump parts are faulty - Change or rebuild pump.

Electrical Troubleshooting

Battery does not charge
Electrical cable connections are corroded or loose - Tighten or clean electrical wiring connections.
Defective battery terminal connectors - Install new terminal connectors.
Dead cell in battery - Replace the battery.
Defective or loose belt - Adjust belt tension or change the belt.

Starter motor turns slow
Battery power is low - Battery is drained, charge it.
Battery does not hold charge - Battery needs service or replacement.
Corroded battery terminals or disconnected wires - Connect wiring correctly or install new terminals.

Starter is not cranking
Battery is low or faulty - Need to charge or replace the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery power - Battery is drained, recharge it.
Starter motor is faulty - Repair or replace starter.