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Bobcat T650 Troubleshooting

The Bobcat T650 compact track loader is powered by 203.2 cu.in (3.3L) Kubota V3307-DI-TE3 4-cylinder direct injection turbocharged diesel engine with a rated power of 70.3 hp (52.4 kW) at 2400 rpm. The Bobcat T650 is equipped with 1-speed or 2-speed hydrostatic transmission, hydraulic disc brakes, and rubber tracks with steel inserts. The hydraulic system has a pump with fluid flow rate of 23.5 gpm (87.1 lpm). The hydraulic pressure is 3550 psi (245 bar). The compact track loader has a rated operating capacity of 2490 lbs (1130 kg) and tipping load of 7120 lbs (3230 kg). The lift height is 124" (3150 mm) to hinge pin, and dump height is 96.3" (2445 mm).

Engine Troubleshooting

Diesel engine hard to start or doesn't start
Air in fuel tank - Bleed fuel tank.
Fuel filter plugged - Change the filter element.
Fuel injection nozzles are damaged - Inspect nozzles and replace if necessary.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Improper valve clearance - Check and adjust as required.
Fuel injection pump damage - Repair or install new pump.

Diesel starts but immediately shuts off
Dirty air cleaner - Service or replace air cleaner.
Fuel filter plugging - Change or clean the 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.
Fuel injection pump is broken - Change pump or rebuild it.

Engine shuts off suddenly during operation
Low coolant temperature - Warm up engine as required.
Fuel filter element is dirty - Change filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are damaged or dirty - Clean or replace injection nozzles.
Wrong setting of fuel injection pump timing - Set the fuel pump timing correctly.

Engine stops when idling
Incorrectly set low idle speed - Adjust low idle speed.
Fuel injection pump is defective - Replace or repair injection pump.
Defective fuel injectors - Test and replace fuel injectors if necessary.
Valve clearance is wrong - Adjust valve clearance.

Engine power loss
Air cleaner is clogged - Service or replace air cleaner.
Fuel injection nozzles are faulty or clogged - Clean or replace injection nozzles.
Insufficient fuel injection pressure - Check the fuel injection pressure and adjust if necessary.
Valve out of adjustment - Adjust valve clearance.
Incorrect low idle setting - Adjust as required.
Dirt in the fuel hoses or lines - Service fuel hoses and lines.
Cylinder head gasket is blown - Cylinder-head gasket replacement required.
Leaking or defective piston rings - Replace piston rings.

Engine overheats
Lack of engine coolant - The cooling system needs to be refilled and checked for faults.
Engine oil level is insufficient - Check and refill engine oil.
Damaged radiator cap or dirty radiator core - Clean radiator or change cap.
Fan belt is worn or faulty - Fan belt must be replaced.
Engine overload - Load reducing is recommended.

Oil pressure is low
Low crankcase oil level - Fill crankcase to proper oil level.
Oil filter element is dirty - Clean or change engine oil filter.
Improper type of engine oil - Fill up with the correct oil viscosity.
Excessive main bearing oil clearance - Replace bearings.
Oil pump is defective - Install a new pump.

Engine knocks or noises
Engine oil level low - Check oil level and add oil as required.
Low coolant temperature - Warm up the engine.
Fuel injection pump timing is not adjusted - Set it up as required.
Improperly adjusted low idle speed - Adjustment required.
Clogged or defective injectors - Inspect fuel injectors and change as required.
Connecting rod is worn or not aligned - Need to change or align the connecting rod.
Scored or worn pistons - Install new pistons.

Drive System Troubleshooting

Drive system doesn't operate in one direction or either direction
Hydraulic fluid level low - Check and refill the hydraulic fluid.
Blocked or defective undercarriage tracks - Repair or correct blockage.
Defective relief valve - Repair or replace relief valve.
Clogged suction line or hydraulic filter - Check, clean, or change if necessary.
Hand or foot controls malfunction - Repair or change.
Worn drive motor or pump - Repair or change faulty component.

Machine is not driving straight or driving is jerky
Damaged or jammed track mechanism - Repair or fix jamming.
Faulty or loose tracks - Adjust track tension properly or repair tracks.
Foreign objects, debris, or dirt stuck in track frame - Clean track frame, remove debris.

Power is too low
Hydraulic oil filter is dirty - Check, clean, or replace as required.
Relief valve is defective or opened - Close or change relief valve.
Worn or faulty transmission components - Check and change faulty components.
Input drive shaft is stuck - Rebuild or change the shaft.
There is air in the hydraulic system - Air bleeding is required.

Drive system is overheated
Hydraulic fluid is insufficient - Add fluid as required.
Hydraulic fluid filter is dirty - Change or service hydraulic filter.
Relief valve failure - Relief valve need to be replaced or repair.
Hydraulic motor or drive pump is defective - Replace or repair faulty component.
Dirty oil cooler - Clean cooling fins as required.
Drive system is overloaded - Reduce drive system load.

Drive system is excessively noisy
Improper oil viscosity - Use oil of proper viscosity.
Air in the hydraulic system - Bleed air from hydraulic system.
Hydraulic motor or drive pump is defective - Repair or change faulty component.
Mechanical components of drive system are worn or damaged - Inspect the parts and repair as needed.

Hydraulics Troubleshooting

Hydraulic system is overheated
Hydraulic pressure incorrectly adjusted - Adjust pressure correctly.
Main relief valve is faulty or misadjusted - Adjust or replace the relief valve.
Contaminated hydraulic oil - Hydraulic oil change required.
Lack of hydraulic fluid - Check and refill the hydraulic fluid.
Faulty hydraulic oil pump - Replace or repair pump if necessary.

Lift arm fails to drop or lift
Lift controls failure - Replace or repair.
Defective hydraulic pump - Install new pump or repair it.
Defective hydraulic control valve - Install a new hydraulic valve or repair it.
Broken hydraulic cylinder - Change or repair lift cylinder.
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.

Bucket fails to tilt
Defective bucket controls - Change or repair.
Hydraulic pump not working - Repair or change pump if required.
Hydraulic control valve malfunction - Repair or replace hydraulic valve.
Bucket cylinder is faulty - Change or repair cylinder.
Hydraulic oil level low - Checking hydraulic oil level and add if necessary.

Boom or bucket is working slowly
Hydraulic pump is faulty - Check pump flow and change pump if necessary.
Leaking hydraulic cylinder - Cylinder seals need to be replaced.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Hydraulic control valve is faulty or out of adjustment - Repair or adjust correctly.
Hydraulic system loosing pressure - Set pressure correctly.

Lift arm or bucket jerks when working
Air in hydraulic system - Need to bleed air.
Plugged hydraulic oil filter - Service or change the hydraulic filter.
Dirty hydraulic oil - Fill up with fresh hydraulic oil.
Cylinder rod or tube is scratched - Change damaged component.

Hydraulic pump makes excessive noise
Insufficient oil level or leaking hydraulic system - Repair hydraulic leaks or add oil as required.
Hydraulic filter is clogged - Replace or clean the filter.
Plugged suction line - Suction line must be serviced.
Air in hydraulic pump - Air bleeding is required.
Pump parts are faulty - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery will not charge
Electrical cable connections are loose or corroded - Tighten or clean electrical wiring connections.
Defective battery terminal clamps - Terminal clamps need to be replaced.
Defective battery - Battery change required.
Damaged or loose belt - Belt needs to be adjusted or replaced.

Starter turns slow
Low battery output voltage - Battery is drained, charge it.
Battery is not holding charge - Battery needs service or replacement.
Wires are disconnected or battery terminals are corroded - Connect cables correctly or replace terminals.

Starter doesn't crank
Battery is drained or worn - Charge or replace the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery power - Low battery charging, charge as required.
Starter motor is defective - Starter should be replaced.