Bobcat T630 Track Loader Troubleshooting

The Bobcat T630 compact track loader driveline system components: a 203.2 cu.in (3.3L) Kubota V3307 4-cylinder turbocharged diesel engine with a rated power of 74.3 hp (55.4 kW), and single-speed or two-speed transmission. The hydraulic system has a pump with a rated flow of 23 gpm (87.1 lpm). The system pressure is 3550 psi (245 bar). The Bobcat T630 is equipped with a radial-lift loader boom, solid-mounted or roller suspension undercarriage, and rubber tracks. The loader has a boom lift force of 6200 lbs (2812 kg) and bucket breakout force of 6250 lbs (2835 kg). The rated operating capacity is 2230 lbs (1012 kg), and tipping load is 6371 lbs (2890 kg).

Engine Troubleshooting

Engine starts hard or won't start

Air in the fuel system - Air bleeding.
Fuel filter plugging - Install new filter element.
Clogged or burnt injection nozzle - Replace injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is out of adjustment - Adjust valve clearance.
Fuel injection pump is not operating properly - Rebuild or change fuel pump.

Engine starts but then stalls

Clogged air cleaner - Clean or replace air cleaner element.
Fuel filter plugged - Service or replace the filter.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Defective or clogged fuel injectors - Change or clean fuel injectors.
Fuel injection pump is not working correctly - Rebuild or change fuel pump.

Engine stops suddenly during operation

Engine is cold - Warm up the engine to required temperature.
Fuel filter is plugged - Service or replace the filter.
Air in the fuel lines - Bleed the fuel lines.
Dirty or damaged injection nozzles - Clean or replace injection nozzles.
Fuel injection pump timing is wrong - Set it up as required.

Engine stalls at idle

Incorrectly adjusted low idle speed - Adjust low idling as recommended.
Fuel injection pump is not operating properly - Repair or replace injection pump.
Damaged or clogged injectors - Change or clean fuel injectors.
Valve out of adjustment - Adjust to proper valve clearance.

Diesel engine is losing power

Dirty air filter - Change or service air filter element.
Dirty or damaged injection nozzles - Replace injection nozzles.
Incorrect fuel injection pressure - Adjust to proper pressure.
Excessive valve clearance - Adjustment procedure required.
Low idle speed setting is not correct - Correct low idle adjustment.
Restricted fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Cylinder head gasket is blown - Install a new gasket.
Piston rings are defective or leaking - Replace the piston rings as required.

Engine is overheated

Insufficient coolant - Refill to the correct level and inspect system for leaks.
Engine oil level low - Check oil level and add oil as required.
Dirty radiator fins or defective radiator cap - Replace cap or clean radiator.
Damaged or worn fan belt - Replace the fan belt.
Engine overloaded - Reduce load on the engine.

Low oil pressure

Oil level is low - Fill the crankcase with oil.
Plugged engine oil filter - Replace or service engine oil filter.
Oil grade or viscosity is wrong - Use oil of correct viscosity.
Crankshaft bearing has incorrect oil clearance - Install new bearings.
Oil pump malfunction - Install a new pump.

Engine noises or knocks

Lack of engine oil - Fill the crankcase with engine oil.
Coolant temperature is low - Warm up engine as required.
Fuel injection pump timing is not adjusted - Adjust according to specifications.
Incorrect low idle setting - Normalize low idle speed.
Fuel injector fault - Inspect fuel injectors and change as required.
Connecting rod is worn or misaligned - Connecting rod needs to be replaced or aligned.
Pistons are scored or worn - Replace the pistons.

Drive System Troubleshooting

Drive system doesn't work in either direction

Hydraulic oil level is low - Checking hydraulic oil level and add if necessary.
Undercarriage tracks are blocked or damaged - Repair or remedy blockage.
Stuck relief valve - Change or repair defective relief valve.
Clogged suction line or hydraulic filter - Clean suction line or change hydraulic filter.
Defective hand or foot controls - Replace or repair.
Worn drive motor or pump - Replace or repair faulty component.

Machine is not moving straight or moving is jerky

Damaged or jammed track mechanism - Repair or remedy jamming.
Tracks are faulty or sagging - Correct track sag with tensioning or repair tracks.
Foreign objects, debris, or dirt stuck in track frame - Clean track frame, remove debris and foreign objects.

Reduced power

Hydraulic oil filter is dirty - Change hydraulic filter.
Opened or worn relief valve - Change or close relief valve.
Transmission components are defective or worn - Check and change defective components.
Input drive shaft is damaged - Replace drive shaft.
Air in hydraulic system - Bleed air from system.

Overheated drive system

Low hydraulic fluid level - Fill up the hydraulic fluid.
Plugged hydraulic fluid filter - Change or service hydraulic filter.
Stuck relief valve - Repair or install a new relief valve.
Worn hydraulic motor or drive pump - Change or repair faulty component.
Plugged hydraulic oil cooler - Clean the cooling fins.
Overloaded drive system - Reduce loading.

Excessive noise

Oil viscosity is wrong - Use the specified type of oil.
Air leaks in hydraulic system - Air bleeding is required.
Drive pump or hydraulic motor malfunction - Inspect and change as required.
Mechanical parts of drive system are worn or damaged - Check the components for defect or damage and change if necessary.

Hydraulics Troubleshooting

Hydraulic system overheating

Hydraulic pressure is not correct - Adjust pressure correctly.
Unadjusted or defective main relief valve - Adjust or change relief valve.
Dirty hydraulic fluid - The fluid must be changed.
Lack of hydraulic oil - Fill the hydraulic system with oil.
Faulty hydraulic oil pump - Repair or change pump if required.

Boom cannot be lowered or raised

Lift controls are damaged - Inspect and repair if necessary.
Hydraulic pump not working - Repair or change pump if required.
Hydraulic control valve is faulty - Repair or replace the valve.
Faulty hydraulic cylinder - Repair or install a new lift cylinder.
Hydraulic fluid is insufficient - Fill the system to proper hydraulic fluid level.

Bucket can't tilt

Defective bucket controls - Change or repair.
Hydraulic pump malfunction - Change or repair hydraulic pump if required.
Hydraulic control valve is faulty - Change or repair hydraulic valve.
Defective bucket cylinder - Repair or change cylinder.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.

Bucket or lift arm is moving slowly

Hydraulic pump is worn - Check pump flow and change pump if necessary.
Hydraulic cylinder leaking - Change cylinder piston seals.
Hydraulic oil level low - Fill the system to proper hydraulic oil level.
Hydraulic control valve is defective or set improper - Repair or set correctly.
Hydraulic pressure is low - Hydraulic pressure must be set correctly.

Lift arm or bucket jerks when working

There is air in the hydraulic system - Air bleeding is required.
Hydraulic oil filter element is clogged - Service or change the hydraulic filter.
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil.
Cylinder rod or tube is scuffed - Change failed component.

Excessive hydraulic pump noise

Insufficient oil level or leaking hydraulic system - Add hydraulic oil or correct system leaks.
Plugged hydraulic filter - Clean or replace the filter.
Dirty suction line - Clean suction line as required.
Pump is sucking air - Need to bleed air.
Damaged pump parts - Install new hydraulic pump or rebuild it.

Electrical Troubleshooting

Battery is not charging

Electrical cable connections are corroded or loose - Tighten or clean connections.
Defective battery terminal clamps - Change terminal clamps.
Bad cell in battery - Install a new battery.
Belt is defective or loose - Need to adjust belt tension or replace belt.

Starter cranks slow

Low battery output voltage - Charge the battery.
Battery will not hold charge - Battery needs to be serviced or replaced.
Bad battery terminals or disconnected wiring - Check cables and service or change terminals.

Starter does not work

Battery is discharged or worn - Recharge or change battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery voltage is low - Battery is drained, recharge it.
Defective starter motor - Repair or replace starter.