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Home / Wheel Loaders / Kubota Wheel Loaders / Kubota R070

Kubota R070 Troubleshooting

The Kubota R070 wheel loader driveline system components: Kubota V2607-CR-E5 four-cylinder naturally aspirated liquid-cooled diesel engine with a rated power of 50.5 hp (37.5 kW), and 2-range hydrostatic transmission. The hydraulic system has a pump with a rated capacity of 14.3 gal/min (54 l/min). The system relief pressure is 2680 psi (185 bar). The Kubota R070 is equipped with a power steering system, wet disc brakes, and 12.5x18 tires. The wheel loader has a maximum lift height to hinge pin of 127.2" (3230 mm) and breakout force of 8160 lbs (3710 kg). The rated operating capacity is 3320 lbs (1510 kg), and tipping load is 6645 lbs (3020 kg).

Engine Troubleshooting

Engine starts up hard or doesn't start
Air in the fuel lines - Bleed the fuel lines.
Fuel filter plugging - Service or replace the filter.
Damaged or dirty injection nozzles - Service or change injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
The valve clearance is incorrect - Check and adjust.
Defective fuel injection pump - Replace injection pump or repair it.

Engine starts but immediately stalls
Air filter is dirty - Clean or replace element.
Fuel filter plugging - Service or replace the filter.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Fuel injectors are faulty or clogged - Clean fuel injectors or change it.
Faulty fuel injection pump - Change or repair the pump.

Engine shuts off suddenly while running
Engine is not warmed up to required temperature - Warm up to required temperature.
Fuel filter is plugged - Clean or replace the filter.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.

Engine stalls when idling
Incorrectly set low idle speed - Correct the settings.
Fuel injection pump damage - Replace or repair injection pump.
Damaged or clogged injectors - Inspect fuel injectors and change as required.
Valve clearance is out of adjustment - Have it adjusted.

Engine loses power
Air cleaner is dirty - Clean or change cleaner.
Fuel injection nozzles are dirty or defective - If necessary, replace with a new nozzle.
Fuel injection pressure is wrong - Adjust to proper pressure.
Valve clearance is out of adjustment - Adjust valve clearance according to specifications.
Incorrectly set low idle speed - Adjust the low idle speed.
Dirt in the fuel hoses or lines - Clean fuel system lines and hoses.
Cylinder head gasket is damaged - Gasket should be replaced.
Worn or broken piston rings - Replace the piston rings as required.

Engine overheated
Low engine coolant - The cooling system needs to be refilled and checked for faults.
Engine oil level low - Fill the crankcase with engine oil.
Clogged radiator fins or damaged radiator cap - Clean radiator or install new cap.
Fan belt is worn or faulty - Fan belt must be replaced.
Engine overloaded - Load reducing required.

Low oil pressure
Low crankcase oil level - Add oil as required.
Oil filter element clogged - Change or service engine oil filter.
Different type of engine oil - Use correct viscosity oil.
Crankshaft bearing oil clearance is incorrect - Change bearings.
Oil pump malfunction - Replace as required.

Engine knocks or noises
Engine oil insufficient - Checking oil level and add if necessary.
Coolant temperature is low - Warm up the engine.
Incorrect adjustment of fuel injection pump timing - Set up as recommended.
Too low idle RPM - Adjustment required.
Fuel injectors are dirty or defective - Replace fuel injectors.
Connecting rod is misaligned or defective - Connecting rod must be aligned or replaced.
Pistons are worn or broken - Install new pistons.

Hydrostatic Transmission Troubleshooting

Excessive HST transmission noise
Transmission fluid is dirty or fluid level is too low - Pour fresh fluid or add transmission fluid to proper level.
Bent or unadjusted speed control pedal linkage - Adjust or replace linkage.
Relief valve failure - Change the valve.
Excessive loading - The load should be reduced.
Transmission components are damaged or worn - After disassembling and inspection, change defective components.

Loss of power
Transmission oil level is low - Check and refill the transmission oil.
Defective relief valve - Change relief valve.
Defective or not adjusted speed control pedal linkage - Change or adjust linkage.

Transmission oil overheating
Low fluid level - Fill the transmission housing to proper fluid level.
Plugged transmission oil filter - Clean or replace the transmission filter.
Cooling components are clogged or damaged - Inspect all cooling components and service or change if necessary.
Transmission overload - Reduce loading.

Transmission oil leaks
Seals or gaskets are worn - Change defective seal or gaskets.
High internal transmission case pressure - Check hydrostatic transmission components for defect or damage and change if necessary.
Oil return tube is plugged - Clean or replace the tube.

Hydraulics Troubleshooting

Hydraulic system overheats
Hydraulic pressure is not adjusted correctly - Correct setting is required.
Faulty or improperly adjusted main relief valve - Set up or change the relief valve.
Hydraulic fluid is dirty - Hydraulic fluid change required.
Not enough hydraulic oil in the system - Fill up the hydraulic oil.
Hydraulic pump is faulty - Repair or change pump if required.

Lift arm does not lower or raise
Defective lift controls - Repair or replace.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Defective hydraulic control valve - Replace or repair the valve.
Faulty hydraulic cylinder - Repair or install a new lift cylinder.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.

Bucket won't move
Bucket tilt controls are damaged - Change or repair.
Damaged hydraulic oil pump - Repair or replace pump if necessary.
Hydraulic control valve is defective - Replace or repair the valve.
Bucket cylinder failure - Replace or repair cylinder.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.

Bucket or lift arm runs slowly
Hydraulic pump is faulty - Check pump flow and install new pump if necessary.
Hydraulic cylinder oil leakage - Repair leak by replacing the seals.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is faulty or out of adjustment - Repair or set properly.
Hydraulic pressure has dropped - Adjust it correctly.

Lift arm or bucket is moving jerkily
Air trapped in hydraulic system - Bleed hydraulic system.
Plugged hydraulic oil filter - Service or replace the hydraulic filter.
Dirty hydraulic fluid - Hydraulic fluid change required.
Scored cylinder tube or rod - Replace damaged component.

Hydraulic pump is excessively noisy
Low oil level or hydraulic leaks - Refill hydraulic oil or repair leaks in system.
Clogged hydraulic filter - Replace or clean the filter.
Clogged suction line - Need to service the suction line.
Pump is sucking air - Air bleeding is required.
Pump parts are faulty - Change or rebuild pump.

Electrical Troubleshooting

Battery cannot be charged
Corroded or loose wire connections - Tighten or clean electrical wiring connections.
Faulty battery terminal clamps - Change terminal clamps.
Battery is defective - Install a new battery.
Loose or defective belt - Adjust belt tension or install a new belt.

Starter cranks slow
Battery capacity is low - Battery is drained, recharge it.
Battery discharges quickly - Battery needs to be serviced or replaced.
Bad terminals or disconnected battery cables - Connect wires properly or change terminals.

Starter motor is not working
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 output - Recharge the battery.
Starter motor is faulty - Repair or install a new starter.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders