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Bobcat 763 G-Series Problems

The Bobcat 763 G-Series skid steer loader driveline system components: a 134.1 cu.in (2.2L) Kubota V2203-EB 4-cylinder water-cooled diesel engine with a rated power of 46 hp (34 kW), and 1-speed hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 15 gal/min (56 l/min). The system relief pressure is 3000 psi (207 bar). The Bobcat 763G is equipped with a radial-lift loader boom, 80HS drive chains, and 10.00x16.5 standard tires. The skid steer loader has a max lift height of 114.5" (2910 mm) to hinge pin and dump height of 84.6" (2150 mm). The rated operating capacity is 1500 lbs (680 kg), and tipping load is 3000 lbs (1360 kg).

Engine Troubleshooting

Engine hard to start or doesn't start
Air in the fuel system - Air bleeding.
Clogged fuel filter - Replace the filter element.
Defective or clogged injection nozzle - Install a new kit of correctly balanced nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve out of adjustment - Adjust valve clearance according to specifications.
Fuel injection pump is damaged - Change or repair the pump.

Diesel starts and stalls immediately
Clogged air cleaner - Clean or replace air cleaner element.
Fuel filter element is dirty - Replace filter element.
Fuel injection pump is leaking - Repair any leaks.
Defective or clogged fuel injectors - Clean fuel injectors or change it.
Faulty fuel injection pump - Repair or install new pump.

Engine stops unexpectedly during operation
Low coolant temperature - Normalize the temperature by warming up the engine.
Fuel filter plugging - Service or replace the filter.
Air in the fuel system - Air bleeding.
Clogged injection nozzle - Test injection nozzles and change if necessary.
Improper setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.

Engine stalls while idling
Wrong adjustment of low idle speed - Adjust low idle speed.
Fuel injection pump is not working correctly - Rebuild or replace pump.
Fuel injectors are dirty or defective - Replace fuel injectors.
Improper valve clearance - Correct valve clearance needs to be set.

Engine power loss
Air filter is clogged - Change or service air filter element.
Fuel injection nozzles are damaged or dirty - Inspect nozzles and replace if necessary.
Fuel injection pressure is wrong - Correct the pressure settings.
Valve out of adjustment - Check and adjust.
Low idle speed setting is not correct - Correct low idle settings.
Fuel lines or hoses are clogged - Clean fuel system hoses and lines.
Cylinder head gasket defective - Change cylinder head gasket.
Damaged or leaking piston rings - Piston rings replacement required.

Engine overheated
Engine has a lack of coolant - Top up coolant fluid and check system for leaks.
Low engine oil level - Fill up the oil to required level.
Clogged radiator core or leaking radiator cap - Install new cap or clean radiator.
Damaged or worn fan belt - The fan belt needs to be replaced.
Engine overloaded - Reduce load on the engine.

Oil pressure is low
Oil level is insufficient - Checking oil level and add if necessary.
Oil filter element clogged - Clean or change engine oil filter.
Oil grade or viscosity is wrong - Use correct viscosity oil.
Crankshaft bearing has excessive oil clearance - Bearing replacement required.
Oil pump is worn or damaged - Install a new pump.

Engine knocking or noise
Insufficient engine oil - Fill the crankcase with engine oil.
Low coolant temperature - Normalize the temperature by warming up the engine.
Improper setting of fuel injection pump timing - Set the fuel pump timing correctly.
Improperly adjusted low idle speed - Adjust low idle speed.
Fuel injectors are faulty or clogged - Clean or replace fuel injectors.
Misaligned or defective connecting rod - Connecting rod needs to be replaced or aligned.
Worn or scored pistons - Pistons replacement required.

Drive System Troubleshooting

Machine will not move forward or backward
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Drive chain failure - Check drive chain and change faulty parts.
Relief valve is damaged or worn - Service or change relief valve.
Hydraulic filter or suction line is clogged - Check, clean, or change if necessary.
Defective or worn foot or hand controls - Check and repair as required.
Drive motor or pump is defective - Repair or change faulty component.

Loss of power
Hydraulic oil filter is dirty - Replace hydraulic filter.
Relief valve is defective or open - Change or close relief valve.
Transmission parts are damaged or faulty - Check and change defective components.
Worn input drive shaft - Faulty drive shaft need to be replaced or repair.
Air in the hydraulic system - Bleed air from system.

Drive system keeps overheating
Insufficient hydraulic fluid - Add fluid as required.
Hydraulic fluid filter is clogged - Replace or service hydraulic filter.
Relief valve malfunction - Change or repair defective relief valve.
Drive pump or hydraulic motor is damaged - Inspect and change as required.
Hydraulic oil cooler is plugged - Cooling fins need to be cleaned.
Overloaded drive system - Load should be reduced.

Excessive noise
Improper oil viscosity - Use oil of proper viscosity.
Hydraulic system is leaking air - Air bleeding is required.
Hydraulic motor or drive pump is worn - Change or repair faulty component.
Mechanical parts of drive system are damaged or worn - Check drive system and change faulty components.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure is not adjusted correctly - Adjust it correctly.
Defective or misadjusted main relief valve - Adjust the valve or replace if necessary.
Dirty hydraulic fluid - The fluid must be changed.
Not enough hydraulic oil in the system - Check oil level and add hydraulic oil as required.
Faulty hydraulic oil pump - Replace or repair pump if necessary.

Boom does not raise or lower
Lift controls are faulty - Check and repair as required.
Hydraulic pump failure - Install new pump or repair it.
Hydraulic control valve malfunction - Change or repair hydraulic valve.
Hydraulic cylinder is broken - Repair or change hydraulic cylinder.
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.

Bucket does not tilt
Faulty bucket tilt controls - Repair or replace.
Hydraulic pump not working - Replace or repair pump if necessary.
Hydraulic control valve malfunction - Install a new valve or repair it.
Hydraulic bucket cylinder not working - Repair or replace cylinder.
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.

Boom or bucket is working slowly
Defective hydraulic pump - Check pump performance and change it if necessary.
Hydraulic cylinder oil leakage - Install new cylinder seals.
Hydraulic fluid level low - Fill up the hydraulic fluid.
Hydraulic control valve is defective or set improper - Set properly or repair.
Low hydraulic pressure - Adjust pressure as required.

Bucket or boom movements are jerky
Air leaks in hydraulic system - Bleed hydraulic system.
Hydraulic oil filter element clogging - Replace or clean the filter.
Contaminated hydraulic fluid - Change hydraulic fluid.
Scratched cylinder rod or tube - Change failed component.

Hydraulic pump is excessively noisy
Hydraulic leaks or lack of oil - Add hydraulic oil or correct system leaks.
Hydraulic filter is dirty - Change or clean oil filter.
Suction line is dirty - Suction line must be serviced.
Air in hydraulic pump - Remove air from hydraulics.
Worn pump components - Rebuild or install new pump.

Electrical Troubleshooting

Battery does not charge
Corroded or loose cable connections - Tighten or service connections.
Faulty electrical terminal connectors - Replace terminal connectors.
Battery is defective - Battery change required.
Belt is defective or loose - Need to adjust belt tension or replace belt.

Starter cranks slowly
Low battery output voltage - Recharge the battery.
Battery runs out quickly - Service or change the battery.
Disconnected cables or faulty battery terminals - Connect cables correctly or replace terminals.

Starter motor won't turn
Battery is low or faulty - Replace or charge as required.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Battery capacity is low - Recharge the battery.
Starter motor failing - Repair or change starter.