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Home / Wheel Loaders / Kubota Wheel Loaders / Kubota R630

Kubota R630 Troubleshooting

The Kubota R630 wheel loader driveline system components: 158.7 cu.in (2.6L) Kubota V2607-CR-TE4 4-cylinder turbocharged diesel engine with a rated power of 61.2 hp (45.6 kW), and 2-range hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 17.7 gal/min (67.2 l/min). The system relief pressure is 3000 psi (206 bar). The Kubota R630 is equipped with a power steering system, wet disc brakes, and 405/70R18 tires. The wheel loader has a maximum lift height to hinge pin of 128" (3250 mm) and boom breakout force of 10420 lbs (4740 kg). The rated operating capacity is 3500 lbs (1587 kg), and tipping load is 7000 lbs (3175 kg).

Engine Troubleshooting

Engine hard to start or will not start
Air in the fuel system - Air bleeding.
Fuel filter element is dirty - Change filter element.
Dirty or faulty injection nozzles - Service or change injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
The valve clearance is not adjusted - Adjust valve clearance.
Faulty fuel injection pump - Rebuild or change fuel pump.

Diesel starts but stalls immediately
Plugged air filter - Clean or replace element.
Dirty fuel filter - Change the filter element.
Fuel injection pump is leaking - Repair any leaks.
Fuel injectors are faulty or clogged - Inspect fuel injectors and change as required.
Fuel injection pump is not working correctly - Repair or install new pump.

Engine stalls during operation
Engine not warmed up - Normalize the temperature by warming up the engine.
Fuel filter is plugged - Replace filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Clogged or defective injection nozzles - Check injection nozzles and replace if required.
Incorrect adjustment of fuel injection pump timing - Check the fuel injection pump timing adjustment.

Engine stops when idling
Low idle speed set incorrectly - Adjust low idling as recommended.
Fuel injection pump is damaged - Replace or repair injection pump.
Defective fuel injectors - Test and replace fuel injectors if necessary.
Excessive valve clearance - Correct valve clearance needs to be set.

Diesel engine is losing power
Air filter is plugged - Clean or replace element.
Fuel injection nozzles fault - Check injection nozzles and replace if required.
Fuel injection pressure is incorrect - Correct the pressure settings.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Low idle speed setting is incorrect - Correct low idle adjustment.
Dirty fuel lines or hoses - Service fuel hoses and lines.
Cylinder head gasket is blown - Replace the gasket as required.
Piston rings are damaged or leaking - Change piston rings.

Engine is overheated
Not enough coolant - Add coolant fluid and inspect the cooling system for leaks.
Engine oil level is insufficient - Check oil level and add oil as required.
Defective radiator cap or clogged radiator fins - Install new cap or clean radiator.
Fan belt is worn or faulty - Change the fan belt.
Engine is overloaded - Load reducing required.

Oil pressure is insufficient
Low crankcase oil level - Check and refill the oil.
Dirty oil filter element - Replace or clean engine oil filter element.
Incorrect engine oil Drain crankcase and refill with correct oil.
Excessive oil clearance of crankshaft bearing - Install new bearings.
Oil pump failure - Check and replace if necessary.

Engine knocking sound or abnormal noise
Insufficient engine oil - Need to add engine oil.
Low coolant temperature - Warm up to required temperature.
Fuel injection pump timing is not adjusted - Adjust the pump as required.
Low idle speed set incorrectly - Normalize low idle speed.
Fuel injectors are dirty or defective - Clean fuel injectors or change it.
Misaligned or defective connecting rod - Align or replace connecting rod.
Pistons are broken or worn - Install new pistons.

Hydrostatic Transmission Troubleshooting

Hydrostatic transmission makes noise
Transmission oil is contaminated or oil level is insufficient - Change transmission oil or top up to proper level.
Bent or unadjusted speed control pedal linkage - Change or adjust linkage.
Relief valve malfunction - Change the valve.
Excessive transmission load - Reduce the load is required.
Transmission parts are worm or defective - After disassembling and inspection, change defective components.

Loss of power
Transmission oil insufficient - Need to add transmission oil.
Relief valve failure - Change the valve.
Speed control linkage is defective or unadjusted - Change or adjust linkage.

Transmission oil overheats
Transmission fluid level is low - Check and refill the transmission fluid.
Clogged transmission fluid filter - Replace or service transmission fluid filter.
Cooling components are clogged or damaged - Check all cooling components and change or clean if required.
Transmission overloaded - Load needs to be reduced.

Transmission oil leaking
Broken seals or gaskets - Gaskets or seal replacement required.
Internal transmission housing pressure is too high - Repair or replace damaged components.
Clogged oil drain line - Clean or replace drain line.

Hydraulics Troubleshooting

Hydraulic system overheats
Hydraulic pressure is not correct - Hydraulic pressure must be set correctly.
Main relief valve failure or improper setting - Adjust or replace the relief valve.
Hydraulic fluid is contaminated - The fluid must be changed.
Not enough hydraulic fluid in the system - Check and refill the hydraulic fluid.
Defective hydraulic pump - Install new pump or repair it.

Boom can't lift or drop
Lift controls malfunction - Repair or change.
Hydraulic pump is broken - Repair or replace pump if necessary.
Hydraulic control valve is faulty - Repair or change hydraulic valve.
Defective hydraulic cylinder - Change or repair lift cylinder.
Low hydraulic fluid level - Fill up the hydraulic fluid.

Bucket does not function
Bucket controls are faulty - Check and repair as required.
Defective hydraulic pump - Repair or install new hydraulic pump.
Damaged hydraulic control valve - Install a new valve or repair it.
Bucket cylinder failure - Change or repair cylinder.
Hydraulic oil is insufficient - Need to add oil.

Slow boom or bucket operation
Hydraulic pump is worn - Test the pump flow rate and install new pump if required.
Oil leaks from hydraulic cylinder - Repair leak by replacing the seals.
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is not set properly or defective - Set correctly or repair.
Hydraulic pressure loss - Adjust pressure as required.

Bucket or boom movements are jerky
Hydraulic system is leaking air - Bleed hydraulic system.
Hydraulic oil filter element is dirty - Clean or change the filter.
Contaminated hydraulic fluid - Change hydraulic fluid.
Cylinder rod or tube is scuffed - Replace defective component.

Hydraulic pump is excessively noisy
Hydraulic leakage or low oil level - Repair hydraulic leaks or add oil as required.
Plugged hydraulic filter - Service or change hydraulic filter.
Dirty suction line - Need to service the suction line.
Air trapped in hydraulic pump - Air bleeding is required.
Pump components are faulty - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery cannot be charged
Loose or corroded electrical wiring connections - Tighten or service cable connections.
Defective battery terminal connectors - Replace terminal connectors.
Battery failing - Use a new battery.
Belt is damaged or loose - Adjust belt tension or change the belt.

Starter cranks slowly
Battery power is low - Battery is drained, charge it.
Battery does not hold charge - Battery needs service or replacement.
Battery terminals are corroded or wires are disconnected - Check cables and clean or change terminals.

Starter is not working
Battery is drained or defective - Need to charge or replace the battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Battery power is low - Recharge the battery.
Damaged starter motor - Repair or change starter.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders