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| Home / Skid Steer Loaders / Bobcat Skid Steer Loaders / Bobcat 731 |
Bobcat 731 Troubleshooting
The
Clark Bobcat 731 skid steer loader driveline system components: a 101 cu.in
(1.6L) Deutz F2L511D 2-cylinder direct injection liquid-cooled diesel engine
with a rated power of 32 hp (23.7 kW), and 1-speed hydrostatic transmission. The
hydraulic system has a pump with a rated capacity of 11 gal/min (42 l/min). The
system relief pressure is 2500 psi (172 bar). The Clark Bobcat 731 is equipped
with radial-lift loader boom, 80H drive chains, and 7.00x15 tires. The loader
has a max lift height is 109 inches (2770 mm) to hinge pin, and dump height is
88.4 inches (2245 mm). The rated operating capacity is 1300 lbs (590 kg), and
tipping load is 2600 lbs (1180 kg).
| Engine Troubleshooting |
Engine starts hard or won't start
There is air in the fuel system - Bleed the system.
Clogged fuel filter - Service the filter.
Clogged or burnt injection nozzle - Check and replace nozzles if required.
Water in the fuel system - Change fuel and repair fuel system.
Incorrect valve clearance - Correct valve clearance.
Fuel injection pump is faulty - Repair or install a new fuel pump.
Engine starts but stops suddenly
Air cleaner is dirty - Clean or replace air cleaner element.
Fuel filter plugged - Replace filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Fuel injectors are dirty or defective - Change or clean fuel injectors.
Fuel injection pump is broken - Change or repair the pump.
Engine shuts off while running
Coolant temperature is low - Warm up the engine.
Fuel filter element clogging - Change the filter element.
Air in the fuel lines - Bleed the fuel lines.
Defective or clogged injection nozzle - Check and replace nozzles if required.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Engine stalls while idling
Incorrectly adjusted low idle speed - Adjustment required.
Fuel injection pump damage - Repair or change injection pump.
Fuel injector fault - Replace fuel injectors.
Valve out of adjustment - Have it adjusted.
Diesel engine loses power
Air filter is plugged - Change or service air filter element.
Clogged or burnt injection nozzle - Check and replace nozzles if required.
Fuel injection pressure is wrong - Correct the pressure settings.
Valve clearance is out of adjustment - Check and adjust as required.
Low idle speed setting is incorrect - Correct the settings.
Fuel lines or hoses are dirty - Clean fuel hoses and lines.
Cylinder head gasket is blown - Change cylinder head gasket.
Leaking or defective piston rings - Replace piston rings.
Engine overheated
Not enough coolant - Top up coolant fluid and check system for leaks.
Engine oil level low - Fill up the oil to required level.
Faulty radiator cap or dirty radiator fins - Replace cap or clean radiator.
Loose or defective fan belt - The fan belt needs to be replaced.
Diesel engine is overloaded - Reduce load on the engine.
Oil pressure too low
Engine oil insufficient - Add oil to the engine crankcase.
Dirty oil filter - Service or change engine oil filter element.
Improper type of engine oil - Use the specified type of engine oil.
Incorrect oil clearance in crankshaft bearing - Bearing replacement required.
Oil pump is worn or damaged - Repair or replace.
Engine knocking sound or abnormal noise
Low engine oil level - Check and refill engine oil.
Engine not warmed up - Normalize the temperature by warming up the engine.
Improper fuel injection timing - Adjust fuel injection pump as required.
Too low idle RPM - Normalize low idle speed.
Fuel injector fault - Change or clean fuel injectors.
Connecting rod is not aligned or worn - Connecting rod needs to be aligned or changed.
Pistons are worn or broken - Install new pistons.
| Drive System Troubleshooting |
Drive system won't work in one direction or either direction
Low hydraulic fluid level - Fill up the hydraulic fluid.
Worn drive chain - Inspect drive chain and replace faulty parts.
Relief valve malfunction - Repair or replace relief valve.
Dirty hydraulic filter or suction line - Service suction line or change hydraulic filter.
Faulty hand or foot controls - Replace or repair.
Worn drive motor or pump - Repair or replace faulty component.
Low power
Plugged hydraulic oil filter - Replace or clean hydraulic filter.
Opened or worn relief valve - Close or change relief valve.
Transmission components are worn or defective - Inspect and replace faulty parts.
Damaged input drive shaft - Service or change faulty drive shaft.
Air trapped in hydraulic system - Bleed air from hydraulic system.
Drive system overheating
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Hydraulic fluid filter is dirty - Replace or clean hydraulic filter.
Relief valve is stuck - Service or change relief valve.
Worn hydraulic motor or drive pump - Inspect and change as required.
Dirty oil cooler - Cooling fins need to be cleaned.
Overloaded drive system - Reduce drive system load.
Excessive noise
Wrong oil viscosity - Use correct oil viscosity.
There is air in the hydraulic system - Air bleeding is required.
Hydraulic motor or drive pump is defective - Replace or repair faulty component.
Worn or defective mechanical parts of drive system - Inspect the parts for defect or damage and repair as required.
| Hydraulics Troubleshooting |
Hydraulic system overheats
Hydraulic pressure incorrectly adjusted - Hydraulic pressure must be set correctly.
Main relief valve is damaged or adjusted improperly - Replace or set up the relief valve.
Contaminated hydraulic oil - Fill up with fresh hydraulic oil.
Hydraulic fluid level is insufficient - Need to add fluid.
Faulty hydraulic oil pump - Repair or replace pump if necessary.
Boom won't lower or raise
Lift controls are defective - Repair or change.
Hydraulic pump is broken - Repair or install new hydraulic pump.
Hydraulic control valve is faulty - Change or repair hydraulic valve.
Defective hydraulic cylinder - Install a new boom cylinder or repair it.
Insufficient hydraulic fluid - Add fluid as required.
Bucket tilt does not work
Bucket controls failure - Replace or repair.
Hydraulic pump failure - Replace or repair pump if necessary.
Hydraulic control valve is faulty - Repair or change the valve.
Bucket cylinder is faulty - Repair or replace cylinder.
Low hydraulic fluid level - Fill up the hydraulic fluid.
Bucket or lift arm moves slowly
Worn hydraulic oil pump - Check the pump capacity and replace pump if required.
Oil leaks from hydraulic cylinder - Change cylinder piston seals.
Hydraulic oil level low - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is faulty or out of adjustment - Set correctly or repair.
Hydraulic system loosing pressure - Hydraulic pressure must be set correctly.
Bucket or boom jerks when working
There is air in the hydraulic system - Air bleeding is required.
Dirty hydraulic oil filter - Service or change the hydraulic filter.
Hydraulic oil is contaminated - The oil must be changed.
Scratched cylinder rod or tube - Change failed component.
Excessive hydraulic pump noise
Hydraulic leakage or low oil level - Add hydraulic oil or correct system leaks.
Plugged hydraulic filter - Clean or replace the filter.
Suction line is clogged - Suction line must be serviced.
Pump sucks air - Need to bleed air.
Pump components are faulty - Change or rebuild pump.
| Electrical Troubleshooting |
Battery won’t charge
Corroded or loose wire connections - Tighten or service cable connections.
Electrical terminal connectors are faulty - Change terminal connectors.
Bad cell in battery - Use a new battery.
Loose or defective belt - Replace belt or adjust belt tension.
Starter cranks slowly
Low battery output voltage - Recharge the battery.
Battery drains quickly - Battery needs service or replacement.
Disconnected cables or faulty battery terminals - Connect wires properly or change terminals.
Starter does not work
Battery is discharged or worn - Charge or change the battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery capacity - Low battery charging, charge as required.
Starter motor is damaged - Starter should be replaced.
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| SKID STEER LOADERS SPECIFICATIONS |