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Home / Wheel Loaders / Kubota Wheel Loaders / Kubota R085

Kubota R085 Troubleshooting

The Kubota R085 wheel loader driveline system components: a 158.7 cu.in (2.6L) Kubota V2607-CR-TE4 vertical 4-cylinder turbocharged liquid-cooled diesel engine with a rated power of 62.2 hp (46 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 R085 is equipped with a power steering system, wet disc brakes, and 12.5x18 or 405/70R18 tires. The wheel loader has a max lift height of 127.2" (3230 mm) and breakout force of 10890 lbs (4950 kg). The rated operating capacity is 3455 lbs (1570 kg), and tipping load is 6910 lbs (3140 kg).

Engine Troubleshooting

Engine hard to start or won't start
Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter plugged - Clean the filter element.
Clogged or burnt injection nozzle - Clean or replace injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is not correct - Adjust to proper valve clearance.
Fuel injection pump failure - Repair or replace injection pump.

Engine stalls after starting
Air filter is plugged - Replace or clean air filter element.
Clogged fuel filter - Change filter element.
Fuel injection pump has loose connections - Tighten the connections.
Fuel injectors are faulty or clogged - Change or clean fuel injectors.
Fuel injection pump malfunctioning - Rebuild or install a new injection pump.

Engine stalls during operation
Coolant temperature is low - Warm up the engine.
Dirty fuel filter - Clean the filter or install new filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are dirty or defective - Test injection nozzles and change if necessary.
Improper fuel injection timing - Adjust fuel injection pump as required.

Engine stops when idling
Incorrect low idle speed adjustment - Adjust low idle speed.
Fuel injection pump malfunction - Repair or install new pump.
Fuel injector fault - Test and replace fuel injectors if necessary.
Valve clearance is wrong - Need to adjust valve clearance.

Diesel engine loses power
Dirty air filter - Clean or change.
Clogged or burnt injection nozzle - Check and replace nozzles if required.
Incorrect fuel injection pressure - Adjust pressure to proper level.
Valve clearance is not correct - Check and adjust as required.
Too low idle RPM - Test and adjust.
Restricted fuel lines or hoses - Service fuel hoses and lines.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Damaged or leaking piston rings - Piston rings need to be replaced.

Engine overheats
Coolant level is low - Top up coolant fluid and check system for leaks.
Lack of engine oil - Need to add engine oil.
Clogged radiator core or leaking radiator cap - Replace cap or clean radiator.
Loose or damaged fan belt - Belt change is required.
Diesel engine overloaded - Reduce engine load.

Insufficient oil pressure
Engine oil insufficient - Check oil level and add oil as required.
Dirty oil filter element - Service or change engine oil filter element.
Oil grade or viscosity is wrong - Use oil of proper viscosity.
Excessive oil clearance of crankshaft bearing - Replace bearings.
Oil pump failure - Remove and inspect oil pump.

Engine knocking or noise
Not enough engine oil - Fill the crankcase with engine oil.
Low coolant temperature - Warm up engine as required.
Fuel injection pump timing is wrong - Set up as recommended.
Incorrectly set low idle speed - Adjust low idle speed.
Dirty or defective injectors - Clean or replace fuel injectors.
Connecting rod failure or misalignment - Align or replace connecting rod.
Piston wear or scoring - Pistons replacement required.

Hydrostatic Transmission Troubleshooting

HST transmission is excessively noisy
Contaminated transmission fluid or low fluid level - Fill to required level or change the fluid.
Worn or out of adjustment speed control linkage - Adjust or change linkage.
Defective relief valve - Replace relief valve as required.
Transmission overload - Reduce transmission load.
Damaged or worn components of hydrostatic transmission - After disassembling and inspection, change defective components.

Power is too low
Transmission oil level is low - Check transmission oil level and add oil as required.
Relief valve is stuck - Install a new valve.
Speed control pedal linkage is bent or not adjusted - Adjust or change linkage.

Transmission oil overheats
Transmission oil level is low - Fill up the transmission oil.
Transmission oil filter is clogged - Service or change transmission oil filter.
Defective or plugged cooling components - Check all cooling components and change or repair if required.
Transmission overload - Reduce transmission load.

External fluid leaks
Worn seals or gaskets - Install new components.
High internal transmission housing pressure - Change defective parts.
Clogged oil drain line - Clean or replace drain line.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not correct - Adjust pressure as required.
Main relief valve is defective or unadjusted - Adjust relief valve or change if required.
Dirty hydraulic oil - The oil must be changed.
Lack of hydraulic fluid - Check and refill the hydraulic fluid.
Defective hydraulic pump - Repair or change pump if required.

Lift arm won't raise or lower
Damaged lift controls - Repair or change.
Hydraulic pump not working - Replace or repair pump if necessary.
Faulty hydraulic control valve - Change or repair hydraulic valve.
Hydraulic cylinder is broken - Repair or replace hydraulic cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Bucket fails to tilt
Faulty bucket tilt controls - Repair or replace.
Defective hydraulic pump - Change or repair hydraulic pump if required.
Faulty hydraulic control valve - Repair or change hydraulic valve.
Bucket cylinder failure - Repair or change cylinder.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.

Bucket or lift arm is moving slowly
Defective hydraulic pump - Check the pump capacity and replace pump if required.
Hydraulic cylinder leaking - Install new cylinder seals.
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.
Faulty or incorrect setting hydraulic control valve - Set properly or repair.
Hydraulic pressure loss - Correct adjustment is required.

Lift arm or bucket jerks when working
There is air in the hydraulic system - Need to bleed air.
Hydraulic oil filter element is dirty - Clean or replace the filter.
Hydraulic fluid is dirty - Change hydraulic fluid.
Cylinder rod or tube is scratched - Change damaged component.

Excessive hydraulic pump noise
Hydraulic leaks or lack of oil - Correct hydraulic leaks or top up oil as needed.
Hydraulic filter clogging - Change or clean oil filter.
Clogged suction line - Clean suction line as required.
Air in hydraulic pump - Need to bleed air.
Worn pump parts - Install new hydraulic pump or rebuild it.

Electrical Troubleshooting

Battery will not charge
Electrical wire connections are loose or corroded - Clean or tighten wiring connections.
Defective electrical terminal connectors - Install new terminal connectors.
Worn-out battery - Battery replacement required.
Worn or loose belt - Adjust belt tension or change the belt.

Starter motor cranks slow
Low battery capacity - Battery needs to be recharged.
Battery is not holding charge - Service battery or change it.
Disconnected battery cables or bad terminals - Connect wiring properly or install new terminals.

Starter will not work
Battery is drained or defective - Charge or change the battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery voltage - Recharge the battery.
Starter motor is defective - Starter should be replaced.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders