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Bobcat 873 Troubleshooting

The Bobcat 873 skid steer loader is powered by 166.7 cu.in (2.7L) Deutz BF4M1011 4-cylinder direct injection turbocharged diesel engine with a rated power of 73.5 hp (54.8 kW) at 2600 rpm. The Bobcat 873 is equipped with a vertical-lift loader boom, one-speed hydrostatic transmission, 100HS drive chains, and 12.00x16.5 standard tires. The hydraulic system has a pump with fluid flow rate of 18 gpm (68 lpm). The hydraulic pressure is 2750 psi (190 bar). The skid steer loader has a rated operating capacity of 2300 lbs (1045 kg) and tipping load of 4600 lbs (2090 kg). The lift height is 124.3" (3155 mm) to hinge pin, and dump height is 97.3" (2470 mm).

Engine Troubleshooting

Diesel engine hard to start or doesn't start
Air trapped in fuel system - Bleed air.
Fuel filter element clogging - Filter maintenance required.
Burnt or defective injection nozzle - Service or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Fuel injection pump is broken - Repair or install a new fuel pump.

Diesel starts and stops
Dirty air filter - Clean or change.
Fuel filter element clogging - Service or replace the filter.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Clogged or defective injectors - Test and replace fuel injectors if necessary.
Faulty fuel injection pump - Change pump or rebuild it.

Engine stalls after running
Engine is not fully warmed up - Warm up the engine.
Fuel filter element is dirty - Clean or change the filter.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Timing of fuel injection pump is incorrect - Adjust the pump as required.

Engine stalls while idling
Low idle speed set incorrectly - Test and adjust.
Fuel injection pump malfunctioning - Rebuild or replace pump.
Defective fuel injectors - Change or clean fuel injectors.
Valve clearance is not correct - Adjustment procedure required.

Diesel power loss
Clogged air cleaner - Install new air cleaner element.
Fuel injection nozzles are damaged or dirty - Inspect nozzles and replace if necessary.
Fuel injection pressure is wrong - Adjust pressure to proper level.
Valve clearance is out of adjustment - Check and adjust.
Incorrectly adjusted low idle speed - Need to adjust idle speed.
Clogged fuel lines or hoses - Clean fuel hoses and lines.
Cylinder head gasket is worn - Install a new gasket.
Worn or damaged piston rings - Piston rings need to be replaced.

Engine is overheated
Engine coolant is insufficient - Fill the cooling system and check components for leaks or other faults.
Insufficient engine oil - Fill up the engine oil.
Dirty radiator fins or faulty radiator cap - Clean radiator or change cap.
Fan belt slipping or worn - Fan belt must be replaced.
Engine overload - Reduce load on the engine.

Oil pressure is insufficient
Low oil level - Fill up the engine oil.
Oil filter is dirty - Change or service engine oil filter.
Improper type of engine oil - Use oil of proper viscosity.
Incorrect crankshaft bearing oil clearance - Bearings need to be reinstalled.
Worn oil pump - Install a new pump.

Engine knocks or noises
Low engine oil level - Fill up the engine oil.
Low coolant temperature - Normalize the temperature by warming up the engine.
Wrong setting of fuel injection pump timing - Adjust according to specifications.
Low idle speed adjustment is incorrect - Correct the settings.
Damaged or clogged injectors - Clean fuel injectors or change it.
Connecting rod failure or misalignment - Replace or align connecting rod.
Worn or broken pistons - Pistons need to be replaced.

Drive System Troubleshooting

Drive system won't operate in either direction
Hydraulic oil level is low - Check and refill the hydraulic oil.
Worn drive chain - Check drive chain and change defective parts.
Faulty relief valve - Relief valve need to be replaced or repair.
Plugged suction line or hydraulic filter - Check, clean, or change if necessary.
Defective foot or hand controls - Check and repair as required.
Worn drive motor or pump - Change or repair faulty component.

Power is too low
Dirty hydraulic oil filter - Check, clean, or replace as required.
Damaged or opened relief valve - Close or replace relief valve.
Worn or defective transmission parts - Inspect and replace defective parts.
Defective input drive shaft - Rebuild or change the shaft.
Air in hydraulic system - Bleed hydraulic system.

Drive system keeps overheating
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Hydraulic fluid filter is dirty - Replace or clean hydraulic filter.
Defective relief valve - Repair or replace.
Worn hydraulic motor or drive pump - Check and repair if required.
Oil cooler is clogged - Cooling fins need to be cleaned.
Drive system is overloaded - Reduce drive system load.

Drive system makes excessive noise
Oil viscosity is incorrect - Use correct oil viscosity.
Air in the hydraulic system - Bleed air from system.
Hydraulic motor or drive pump is worn - Check and repair if required.
Mechanical parts of drive system are worn or damaged - Check drive system and change faulty components.

Hydraulics Troubleshooting

Hydraulic system overheats
Incorrect hydraulic pressure setting - Set pressure correctly.
Main relief valve is damaged or adjusted improperly - Replace or set up the relief valve.
Hydraulic oil is contaminated - Fill up with fresh hydraulic oil.
Hydraulic fluid level is low - Need to add fluid.
Faulty hydraulic oil pump - Repair or replace pump if necessary.

Boom won't lower or raise
Lift controls malfunction - Replace or repair.
Damaged hydraulic oil pump - Change or repair hydraulic pump if required.
Hydraulic control valve failure - Repair or replace the valve.
Broken hydraulic cylinder - Repair or replace hydraulic cylinder.
Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.

Bucket won't move
Faulty bucket tilt controls - Repair or change.
Hydraulic pump malfunction - Change or repair hydraulic pump if required.
Faulty hydraulic control valve - Repair or change the valve.
Defective bucket cylinder - Repair or replace cylinder.
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.

Boom or bucket is working slowly
Hydraulic pump is worn - Check the pump performance and replace it if required.
Oil leaks from hydraulic cylinder - Install new cylinder seals.
Hydraulic oil level low - Need to add oil.
Hydraulic control valve is defective or set improper - Adjust correctly or repair.
Hydraulic pressure loss - Hydraulic pressure must be set correctly.

Jerky operation of the bucket or boom
Air in hydraulic system - Bleed air from hydraulic system.
Hydraulic oil filter is dirty - Clean or install new filter.
Hydraulic fluid contamination - Hydraulic fluid change required.
Cylinder rod or tube is scratched - Replace defective component.

Hydraulic pump is noisy
Hydraulic system leaking or not enough oil - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter is clogged - Service or change hydraulic filter.
Clogged suction line - Service the suction line.
Air trapped in hydraulic pump - Bleed air from hydraulics.
Damaged pump parts - Rebuild or install new pump.

Electrical Troubleshooting

Battery won’t charge
Loose or corroded electrical wiring connections - Clean or tighten wiring connections.
Faulty battery terminal clamps - Terminal clamps should be changed.
Battery faulty cell - Battery change required.
Loose or damaged belt - Install a new belt or adjust belt tension.

Starter cranks slow
Low battery output - Battery needs to be recharged.
Battery runs out quickly - Service charging system or change battery.
Disconnected wires or corroded battery terminals - Connect wires correctly or change terminals.

Starter will not work
Battery is discharged or worn - Recharge or replace battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Battery voltage is low - Low battery charging, charge as required.
Starter motor failing - Starter should be changed.