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Bobcat 763 Troubleshooting

The Bobcat 763 skid steer loader is powered by 134 cu.in (2.2L) Kubota V2203-EB 4-cylinder water-cooled diesel engine with a rated power of 46 hp (34 kW) at 2800 rpm. The Bobcat 763 is equipped with a radial-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 15.6 gpm (59 lpm) or 25.8 gpm (97.8 lpm). The hydraulic pressure is 3000 psi (207 bar). The skid steer loader has a rated operating capacity of 1500 lbs (680 kg) and tipping load of 3000 lbs (1360 kg). The lift height is 114.5" (2910 mm) to hinge pin, and dump height is 86.4" (2195 mm).

Engine Troubleshooting

Engine hard to start or will not start
Air trapped in fuel system - Bleed air.
Clogged fuel filter - Clean or change the filter.
Clogged or burnt injection nozzle - Change fuel injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Excessive valve clearance - Need to adjust valve clearance.
Damaged fuel injection pump - Change or repair the pump.

Diesel starts and stalls immediately
Air filter is clogged - Clean or replace element.
Fuel filter plugged - Replace the filter element.
Fuel injection pump has loose connections - Tighten the connections.
Dirty or defective injectors - Replace or clean fuel injectors.
Fuel injection pump failure - Replacement or repair required.

Diesel shuts off while driving
Low coolant temperature - Warm up the engine.
Fuel filter element is clogged - Clean or replace the filter.
Air trapped in fuel system - Bleed air.
Defective or clogged injection nozzle - Change fuel injection nozzles.
Timing of fuel injection pump is incorrect - Set up as recommended.

Engine stalls while idle
Incorrectly set low idle speed - Adjust as required.
Fuel injection pump damage - Repair or replace injection pump.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Excessive valve clearance - Adjustment procedure required.

Engine power is too low
Air filter is dirty - Clean or replace element.
Dirty or faulty injection nozzles - Clean or replace injection nozzles.
Incorrect fuel injection pressure - Adjust to correct pressure.
Excessive valve clearance - Adjust valve clearance.
Improperly adjusted low idle speed - Adjust low idle speed.
Dirt in the fuel lines or hoses - Clean fuel system hoses and lines.
Cylinder head gasket defective - Install a new gasket.
Piston rings are damaged or leaking - Replace the piston rings as required.

Engine is overheated
Engine coolant is insufficient - The cooling system needs to be refilled and checked for faults.
Engine oil insufficient - Check and refill engine oil.
Radiator core is dirty or radiator cap is damaged - Clean radiator or install new cap.
Fan belt is broken or worn - Change the fan belt.
Engine overload - Reduce engine load.

Low oil pressure
Engine oil level low - Fill the crankcase with oil.
Oil filter is clogged - Replace or service engine oil filter.
Improper type of engine oil - Use proper viscosity oil.
Crankshaft bearing oil clearance is incorrect - Change bearings.
Oil pump failure - Install a new pump.

Engine noise or knocking
Insufficient engine oil - Check and refill engine oil.
Engine not warmed up - Warm up the engine.
Fuel injection pump timing is not adjusted - Check the fuel injection pump timing adjustment.
Wrong adjustment of low idle speed - Adjust as required.
Fuel injectors are dirty or defective - Clean fuel injectors or change it.
Connecting rod is misaligned or defective - Align or replace connecting rod.
Pistons are worn or scored - Replace the pistons.

Drive System Troubleshooting

Drive system сan't work in either direction
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.
Worn drive chain - Check drive chain and change faulty parts.
Relief valver is broken - Change or repair relief valve.
Plugged suction line or hydraulic filter - Service suction line or change hydraulic filter.
Damaged or worn hand or foot controls - Repair or replace.
Defective drive pump or motor - Change or repair faulty component.

Low power
Hydraulic oil filter is dirty - Check, clean, or change as necessary.
Relief valve is damaged or open - Replace or close relief valve.
Transmission components are damaged or faulty - Check and replace defective components.
Stuck input drive shaft - Replace or service the drive shaft.
Air in the hydraulic system - Bleed air from system.

Drive system overheating
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Hydraulic fluid filter is dirty - Change hydraulic filter.
Worn or damaged relief valve - Relief valve need to be replaced or repair.
Hydraulic motor or drive pump failure - Inspect and change as required.
Plugged hydraulic oil cooler - Cooling fins need to be cleaned.
Drive system overload - Reduce the load.

Excessive noise
Oil viscosity is too heavy - Use the specified type of oil.
Air trapped in hydraulic system - Bleed hydraulic system.
Hydraulic motor or drive pump is defective - Repair or change faulty component.
Mechanical parts of drive system are damaged or worn - Check drive system and change faulty parts.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure incorrectly adjusted - Adjust pressure as required.
Unadjusted or defective main relief valve - Adjust relief valve or change if required.
Hydraulic oil is dirty - Fill up with fresh hydraulic oil.
Lack of hydraulic oil - Fill the hydraulic system with oil.
Faulty hydraulic oil pump - Repair or change pump if required.

Boom won't lower or raise
Lift controls malfunction - Repair or replace.
Damaged hydraulic oil pump - Repair or install new hydraulic pump.
Damaged hydraulic control valve - Install a new hydraulic valve or repair it.
Damaged hydraulic cylinder - Repair or replace hydraulic cylinder.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.

Bucket does not function
Bucket tilt controls are damaged - Inspect and repair if necessary.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Hydraulic control valve is faulty - Repair or change hydraulic valve.
Damaged bucket cylinder - Repair or replace cylinder.
Low hydraulic oil level - Check and refill the hydraulic oil.

Bucket or lift arm moves slowly
Defective hydraulic pump - Check hydraulic pump flow and replace pump if necessary.
Oil leaks from hydraulic cylinder - Correct leakage by changing the seals.
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is defective or set improper - Set properly or repair.
Hydraulic pressure has dropped - Correct setting is required.

Jerky operation of the bucket or boom
Air leaks in hydraulic system - Bleed air from system.
Hydraulic oil filter element is dirty - Change or clean oil filter.
Contaminated hydraulic fluid - Hydraulic fluid change required.
Cylinder tube or rod scoring - Replace worn component.

Hydraulic pump is excessively noisy
Hydraulic leakage or lack of oil - Refill hydraulic oil or repair leaks in system.
Hydraulic filter is dirty - Clean or change the filter.
Clogged suction line - Need to service the suction line.
Air in hydraulic pump - Bleed air.
Damaged pump components - Rebuild or install new pump.

Electrical Troubleshooting

Battery does not charge
Corroded or loose wire connections - Service or tighten cable connections.
Battery terminal connectors are defective - Install new terminal connectors.
Battery failing - Use a new battery.
Belt is loose or defective - Belt needs to be adjusted or changed.

Starter turns slow
Battery voltage is low - Recharge the battery.
Battery won’t hold charge - Service battery or change it.
Disconnected battery cables or bad terminals - Check cables and clean or change terminals.

Starter will not crank
Battery is drained or defective - Need to charge or replace the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery power is low - Recharge the battery.
Damaged starter motor - Repair or install a new starter.