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Bobcat 741 Troubleshooting

The Bobcat 741 skid steer loader is powered by 101 cu.in (1.65L) Deutz F2L511 four-cycle two-cylinder air-cooled diesel engine with a rated power of 29.7 hp (22.1 kW) at 2800 rpm. The Bobcat 741 is equipped with a radial-lift loader boom, single-speed hydrostatic transmission, 80HS drive chains, and 7.00x15 standard tires. The hydraulic system has a pump with fluid flow rate of 11 gpm (41.6 lpm). The hydraulic pressure is 2400 psi (165 bar). The skid steer loader has a rated operating capacity of 1300 lbs (590 kg) and tipping load of 2600 lbs (1180 kg). The lift height is 109 inches (2770 mm) to hinge pin, and dump height is 86.3 inches (2190 mm).

Engine Troubleshooting

Engine starts hard or will not start
Air in fuel tank - Bleed fuel tank.
Fuel filter element is dirty - Install new filter element.
Fuel injection nozzles are damaged or dirty - Change fuel injection nozzles.
Water in the fuel system - Change fuel and repair fuel system.
Excessive valve clearance - Check and adjust as required.
Fuel injection pump is damaged - Rebuild or change fuel pump.

Engine starts but stops suddenly
Air cleaner is clogged - Clean or replace element.
Dirty fuel filter - Install new filter element.
Fuel injection pump is leaking - Repair any leaks.
Defective or clogged fuel injectors - Replace or clean fuel injectors.
Fuel injection pump is broken - Change pump or rebuild it.

Engine stalls during operation
Engine is cold - Warm up to required temperature.
Fuel filter element is clogged - Change filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are dirty or defective - Change fuel injection nozzles.
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.

Engine stops at idle
Incorrectly set low idle speed - Adjust the low idle speed.
Fuel injection pump is broken - Install a new pump or rebuild.
Defective fuel injectors - Inspect fuel injectors and change as required.
Valve out of adjustment - Adjust to proper valve clearance.

Loss of engine power
Air cleaner is clogged - Service or replace air cleaner.
Clogged or defective injection nozzles - Clean or replace injection nozzles.
Improper fuel injection pressure - Test fuel injection pressure and adjust it correctly.
The valve clearance is not adjusted - Check and adjust as required.
Low idle speed set incorrectly - Adjust as required.
Fuel hoses or lines clogging - Clean fuel lines and hoses.
Leaking cylinder head gasket - Install a new gasket.
Piston rings are damaged or leaking - Install new piston rings.

Engine overheated
Low engine coolant - Add coolant fluid to cooling system and also check it for leaks.
Engine oil insufficient - Fill up the engine oil.
Clogged radiator fins or leaking radiator cap - Install new cap or clean radiator.
Excessive wear of the fan belt - Belt change is required.
Diesel engine is overloaded - Reduce load on the engine.

Oil pressure is insufficient
Low crankcase oil level - Check oil level and add oil as required.
Oil filter element is dirty - Clean or change engine oil filter.
Improper type of engine oil - Use proper viscosity oil.
Crankshaft bearing has excessive oil clearance - Bearing replacement required.
Oil pump failure - Repair or replace.

Abnormal engine noise or knocking
Lack of engine oil - Check oil level and add oil as required.
Coolant temperature is low - Warm up to required temperature.
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Low idle speed setting is not correct - Adjust low idle speed.
Clogged or defective injectors - Clean fuel injectors or change it.
Connecting rod is misaligned or worn - Need to replace or align the connecting rod.
Worn or broken pistons - Replace the pistons.

Drive System Troubleshooting

Drive system does not work in either direction
Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.
Worn drive chain - Inspect drive chain and replace faulty components.
Relief valve defective or worn - Repair or replace.
Dirty hydraulic filter or suction line - Service suction line or change hydraulic filter.
Worn or damaged foot or hand controls - Repair or replace.
Drive motor or pump failure - Check and repair if required.

Low power
Plugged hydraulic oil filter - Change or clean hydraulic filter.
Opened or worn relief valve - Close or replace relief valve.
Transmission components are defective or worn - Check and change faulty components.
Input drive shaft is stuck - Faulty drive shaft need to be replaced or repair.
Air in hydraulic system - Bleed hydraulic system.

Drive system overheating
Insufficient hydraulic fluid - Fill up the hydraulic fluid.
Plugged hydraulic fluid filter - Change or service hydraulic filter.
Relief valver is broken - Repair or replace relief valve.
Worn hydraulic motor or drive pump - Inspect and replace as necessary.
Hydraulic oil cooler is plugged - Clean the cooling fins.
Drive system is overloaded - Reduce drive system load.

Excessive noise
Oil viscosity is incorrect - Drain and refill with correct oil.
There is air in the hydraulic system - Bleed hydraulic system.
Worn hydraulic motor or drive pump - Repair or replace faulty component.
Mechanical parts of drive system are defective or worn - Check the parts for worn or defect and replace if required.

Hydraulics Troubleshooting

Hydraulic system has overheating
Hydraulic pressure is not adjusted correctly - Set pressure correctly.
Defective or misadjusted main relief valve - Adjust relief valve or change if required.
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil.
Hydraulic fluid level is insufficient - Need to add fluid.
Hydraulic pump is worn - Repair or change pump if required.

Lift arm won't raise or lower
Lift controls failure - Repair or change.
Hydraulic pump not working - Replace or repair pump if necessary.
Faulty hydraulic control valve - Repair or replace hydraulic valve.
Hydraulic cylinder failure - Repair or change hydraulic cylinder.
Hydraulic fluid level low - Fill up the hydraulic fluid.

Bucket is not working
Faulty bucket tilt controls - Replace or repair.
Defective hydraulic pump - Replace or repair pump if necessary.
Hydraulic control valve is defective - Change or repair hydraulic valve.
Bucket cylinder is faulty - Repair or change cylinder.
Low hydraulic fluid level - Fill the system to proper hydraulic fluid level.

Slow boom or bucket action
Worn hydraulic oil pump - Check hydraulic pump flow and replace pump if necessary.
Leaking hydraulic cylinder - Correct leakage by changing the seals.
Hydraulic fluid level low - Fill the system to proper hydraulic fluid level.
Defective or not adjusted hydraulic control valve - Set correctly or repair.
Hydraulic pressure is low - Correct adjustment is required.

Lift arm or bucket jerks when working
Hydraulic system is leaking air - Bleed hydraulic system.
Dirty hydraulic oil filter - Service or replace the hydraulic filter.
Hydraulic oil contamination - The oil must be changed.
Cylinder rod or tube is scuffed - Replace damaged component.

Hydraulic pump is excessively noisy
Not enough oil or hydraulic system leaking - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter clogging - Clean or install new filter.
Dirty suction line - Clean suction line as required.
Air enters the pump - Bleed air.
Pump parts are faulty - Rebuild or change hydraulic pump.

Electrical Troubleshooting

Battery does not charge
Corroded or loose electrical wire connections - Service or tighten connections.
Battery terminal clamps are faulty - Terminal clamps should be changed.
Faulty cell in battery - Replace the battery.
Belt is worn or loose - Need to adjust belt tension or replace belt.

Starter cranks slow
Battery power is low - Recharge the battery.
Battery runs out quickly - Service or replace the battery.
Bad terminals or disconnected battery cables - Connect wires properly or change terminals.

Starter is not working
Battery is low or faulty - Replace or charge as required.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery output - Low battery charging, charge as required.
Starter motor failing - Replace or repair starter.