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Home / Wheel Loaders / Bobcat Wheel Loaders / Bobcat AL275

Bobcat AL275 Troubleshooting

The Bobcat AL275 articulated wheel loader is powered by 148.5 cu.in (2.4L) Kubota V2403-M-DI 4-cylinder direct injection diesel engine with a rated power of 48.1 hp (35.9 kW) at 2600 rpm. The Bobcat AL275 is equipped with a 2-range hydrostatic transmission, power steering system, hydraulic drum brakes, and 365/70R18 standard tires. The hydraulic system has a pump with fluid flow rate of 10.8 gpm (41 lpm). The hydraulic pressure is 3625 psi (250 bar). The wheel loader has a rated operating capacity of 2725 lbs (1240 kg) and tipping load of 5450 lbs (2480 kg). The maximum lift height is 122.8" (3120 mm) to hinge pin, and breakout force is 8295 lbs (3770 kg).

Engine Troubleshooting

Engine starts hard or doesn't start
There is air in the fuel system - Bleed the system.
Clogged fuel filter - Change the filter element.
Defective or clogged injection nozzle - Check injection nozzles and replace if required.
Water in the fuel system - Change fuel and repair fuel system.
The valve clearance is incorrect - Correct valve clearance.
Fuel injection pump is not operating properly - Install a new fuel pump or repair.

Engine starts but immediately stalls
Air filter is dirty - Replace or clean air filter element.
Dirty fuel filter - Install new filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Fuel injectors are faulty or clogged - Clean or replace fuel injectors.
Fuel injection pump is not working correctly - Replacement or repair required.

Engine stalls after running
Engine is cold - Normalize the temperature by warming up the engine.
Clogged fuel filter - Clean the filter or install new filter element.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are damaged - Change fuel injection nozzles.
Fuel injection pump timing is wrong - Adjust according to specifications.

Engine stalls when idle
Incorrectly adjusted low idle speed - Adjustment required.
Fuel injection pump damage - Replace or rebuild injection pump.
Fuel injectors are dirty or defective - Inspect fuel injectors and change as required.
Excessive valve clearance - Have it adjusted.

Engine loses power
Plugged air cleaner - Install new air cleaner element.
Clogged or burnt injection nozzle - Clean or replace injection nozzles.
Incorrect fuel injection pressure - Correct the pressure settings.
Excessive valve clearance - Adjust valve clearance according to specifications.
Improperly adjusted low idle speed - Correct low idle settings.
Fuel lines or hoses are clogged - Service fuel hoses and lines.
Leaking cylinder head gasket - Replace the gasket as required.
Piston rings are defective or leaking - Piston rings need to be replaced.

Engine overheating
Insufficient coolant fluid - Refill to the correct level and inspect system for leaks.
Engine oil level is insufficient - Fill up the oil to required level.
Radiator core is dirty or radiator cap is damaged - Clean radiator or install new cap.
Damaged or worn fan belt - If necessary, replace the belt.
Engine is overloaded - Load reducing is recommended.

Low oil pressure
Low oil level - Fill up the engine oil.
Oil filter element clogging - Clean or replace engine oil filter element.
Oil grade or viscosity is incorrect - Use the specified type of engine oil.
Crankshaft bearing has excessive oil clearance - Replace bearings.
Defective oil pump - Repair or change.

Abnormal engine knocking or noise
Insufficient engine oil - Add oil to the engine crankcase.
Engine is not preheated - Warm up engine as required.
Fuel injection pump timing is wrong - Adjust according to specifications.
Incorrectly set low idle speed - Correct low idle settings.
Fuel injector fault - Replace or clean fuel injectors.
Connecting rod misalignment or failure - Replace or align connecting rod.
Broken or worn pistons - Have pistons replaced.

Hydrostatic Transmission Troubleshooting

Excessive HST transmission noise
Oil is dirty or oil level is too low - Fill to required level or change the transmission oil.
Speed control pedal linkage is damaged or out of adjustment - Change or adjust linkage.
Relief valve malfunction - Replace relief valve.
Transmission is under excessive load - Reduce the load is required.
Damaged or worn components of hydrostatic transmission - Check internal transmission parts for damage or wear and replace if required.

Power is too low
Lack of transmission fluid - Add fluid to the transmission housing.
Relief valve malfunction - Install a new relief valve.
Worn or unadjusted speed control linkage - Repair or adjust linkage.

Transmission oil overheats
Transmission fluid level is low - Fill the transmission housing to proper fluid level.
Dirty transmission oil filter element - Clean or replace the transmission filter.
Cooling components are defective or plugged - Check all cooling components and change or repair if required.
Transmission overload - Reduce the load is required.

Transmission fluid leaks
Damaged gaskets or seals - Install new components.
Transmission case internal pressure is too high - Change defective parts.
Oil drain line is clogged - Clean or change the line.

Hydraulics Troubleshooting

Hydraulic system overheats
Incorrect hydraulic pressure setting - Adjust pressure correctly.
Defective or misadjusted main relief valve - Adjust or change relief valve.
Hydraulic oil contamination - Change hydraulic oil.
Hydraulic fluid level is low - Fill the hydraulic system with oil.
Hydraulic pump is worn - Repair or change pump if required.

Boom fails to lift or drop
Faulty lift controls - Check and repair as required.
Hydraulic pump malfunction - Install new pump or repair it.
Hydraulic control valve is defective - Change or repair hydraulic valve.
Hydraulic cylinder not working - Repair or change hydraulic cylinder.
Hydraulic fluid level low - Fill up the hydraulic fluid.

Bucket does not tilt
Bucket tilt controls malfunction - Repair or replace.
Defective hydraulic pump - Repair or change pump if required.
Damaged hydraulic control valve - Install a new hydraulic valve or repair it.
Hydraulic bucket cylinder not working - Replace or repair cylinder.
Insufficient hydraulic fluid - Fill up the hydraulic fluid.

Bucket or lift arm runs slowly
Defective hydraulic pump - Test the pump performance and change pump if required.
Leaking hydraulic cylinder - Repair leak by replacing the seals.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Worn or unadjusted hydraulic control valve - Repair or set correctly.
Hydraulic pressure has dropped - Adjust pressure correctly.

Lift arm or bucket is moving jerkily
Air leaks in hydraulic system - Bleed air from system.
Plugged hydraulic oil filter - Clean or change the filter.
Contaminated hydraulic fluid - Hydraulic fluid change required.
Cylinder rod or tube is scuffed - Change failed component.

Hydraulic pump makes excessive noise
Hydraulic leaks or lack of oil - Correct hydraulic leaks or top up oil as needed.
Dirty hydraulic filter - Service or change hydraulic filter.
Suction line clogging - Clean suction line as required.
Pump sucks air - Bleed air from hydraulics.
Worn pump parts - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery won’t charge
Wiring connections are loose or corroded - Service or tighten cable connections.
Battery terminal clamps are faulty - Replace terminal clamps.
Battery is defective - Install a new battery.
Damaged or loose belt - Adjust belt tension or change the belt.

Starter turns slow
Low battery output - Low battery charging, charge as required.
Battery is draining quickly - Service battery or replace it.
Disconnected wiring or bad battery terminals - Connect wiring correctly or install new terminals.

Starter will not work
Battery is discharged or defective - Recharge or change battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery voltage is low - Battery is drained, charge it.
Starter motor is defective - Starter needs to be changed.

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WHEEL LOADERS SPECIFICATIONS

Wheel Loaders, Skid Steers, and Compact Track Loaders