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Bobcat 873 G-Series Problems

The 873G G-Series skid steer loader is powered by Deutz BF4M1011F 4-cylinder turbocharged diesel engine with a rated power of 73.5 hp (54.8 kW) at 2600 rpm. The Bobcat 873G is equipped with a vertical-lift loader boom, 1-speed or 2-speed hydrostatic transmission, 100HS drive chains, and 12x16.5 standard tires. The hydraulic system has a pump with fluid flow rate of 18 gpm (68 lpm) or 30.7 gpm (116.3 lpm). The hydraulic pressure is 2900 psi (200 bar). The skid steer loader has a rated operating capacity of 2400 lbs (1090 kg) and tipping load of 4800 lbs (2180 kg). The lift height is 124.3" (3155 mm) to hinge pin, and dump height is 97.3" (2470 mm).

Engine Troubleshooting

Diesel hard to start or doesn't start
Air in the fuel lines - Bleed the fuel lines.
Fuel filter plugged - Change filter element.
Clogged or defective injection nozzles - Clean or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is not correct - Correct valve clearance needs to be set.
Faulty fuel injection pump - Replace or repair injection pump.

Diesel starts but immediately stops
Air cleaner is dirty - Install new air cleaner element.
Fuel filter element is dirty - Clean the filter or install new filter element.
Fuel injection pump has loose connections - Tighten the connections.
Clogged or defective injectors - Replace fuel injectors.
Fuel injection pump is not working correctly - Rebuild or change fuel pump.

Diesel shuts off while driving
Low coolant temperature - Warm up engine as required.
Dirty fuel filter - Install new filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Change fuel injection nozzles.
Fuel injection pump timing is wrong - Set up as recommended.

Engine shuts off while idling
Incorrect low idle speed adjustment - Correct low idle adjustment.
Fuel injection pump is not working correctly - Replace injection pump or repair it.
Defective fuel injectors - Inspect fuel injectors and change as required.
Valve clearance is out of adjustment - Need to adjust valve clearance.

Diesel engine is losing power
Clogged air cleaner - Clean or replace air cleaner element.
Fuel injection nozzles are dirty or defective - Change fuel injection nozzles.
Incorrect fuel injection pressure - Adjust pressure to proper level.
Improper valve clearance - Correct valve clearance.
Incorrect low idle speed adjustment - Adjust the low idle speed.
Fuel lines or hoses clogging - Clean fuel lines and hoses.
Worn cylinder head gasket - Replace cylinder head gasket.
Worn or broken piston rings - Piston rings replacement required.

Engine is overheated
Not enough coolant - The cooling system needs to be refilled and checked for faults.
Not enough engine oil - Fill the crankcase with engine oil.
Dirty radiator fins or defective radiator cap - Clean radiator or install new cap.
Damaged or worn fan belt - Change as required.
Engine is overloaded - Reduce load on the engine.

Oil pressure is low
Low oil level - Need to add oil.
Oil filter clogging - Change or clean engine oil filter element.
Wrong oil viscosity - Use the specified type of engine oil.
Crankshaft bearing oil clearance is excessive - Bearing replacement required.
Oil pump is worn or damaged - Check and replace if necessary.

Engine knocks or noises
Engine oil level low - Check and refill engine oil.
Low coolant temperature - Normalize the temperature by warming up the engine.
Wrong setting of fuel injection pump timing - Set the fuel pump timing correctly.
Too low idle RPM - Normalize low idle speed.
Dirty or defective injectors - Change or clean fuel injectors.
Connecting rod failure or misalignment - Connecting rod needs to be replaced or aligned.
Pistons are worn or broken - Have pistons replaced.

Drive System Troubleshooting

Machine is not moving in one direction or either direction
Low hydraulic fluid level - Add fluid as required.
Worn drive chain - Check drive chain and change defective parts.
Relief valve failure - Service or change relief valve.
Plugged suction line or hydraulic filter - Check, clean, or change if necessary.
Hand or foot controls malfunction - Inspect and repair if necessary.
Drive pump or motor is damaged - Check and repair if required.

Loss of power
Clogged hydraulic oil filter - Replace or service hydraulic filter.
Opened or worn relief valve - Replace or close relief valve.
Transmission components are worn or defective - Check and replace faulty components.
Input drive shaft is worn - Service or change faulty drive shaft.
Hydraulic system is leaking air - Air bleeding is required.

Overheated drive system
Hydraulic fluid is insufficient - Checking hydraulic fluid level and add if necessary.
Hydraulic fluid filter is plugged - Replace hydraulic filter.
Defective or worn relief valve - Repair or install a new relief valve.
Hydraulic motor or drive pump failure - Check and repair if required.
Clogged hydraulic oil cooler - Clean the cooling fins.
Drive system overload - Reduce drive system load.

Drive system is noisy
Oil viscosity is wrong - Drain and refill with correct oil.
Air in hydraulic system - Bleed air from hydraulic system.
Worn hydraulic motor or drive pump - Change or repair faulty component.
Worn or damaged mechanical parts of drive system - Inspect the parts for worn or defect and repair as needed.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure is not adjusted correctly - Adjust it correctly.
Misadjusted or defective main relief valve - Adjust relief valve or change if required.
Dirty hydraulic fluid - Fill up with fresh hydraulic fluid.
Not enough hydraulic fluid in the system - Need to add fluid.
Defective hydraulic pump - Install new pump or repair it.

Boom does not raise or lower
Lift controls malfunction - Repair or change.
Defective hydraulic pump - Repair or install new hydraulic pump.
Damaged hydraulic control valve - Repair or change hydraulic valve.
Hydraulic cylinder not working - Repair or replace hydraulic cylinder.
Low hydraulic oil level - Need to add oil.

Bucket tilt does not work
Damaged bucket controls - Replace or repair.
Defective hydraulic pump - Repair or change pump if required.
Hydraulic control valve malfunction - Install a new valve or repair it.
Bucket cylinder failure - Install a new cylinder or repair it.
Insufficient hydraulic oil - Need to add oil.

Slow bucket or lift arm action
Hydraulic pump is defective - Check the pump performance and replace it if required.
Hydraulic cylinder oil leakage - Correct leakage by changing the seals.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.
Worn or unadjusted hydraulic control valve - Repair or adjust correctly.
Hydraulic pressure has dropped - Adjust pressure correctly.

Jerky operation of the bucket or boom
Air leaks in hydraulic system - Bleed air from system.
Hydraulic oil filter is clogged - Service or change the hydraulic filter.
Hydraulic fluid is dirty - Hydraulic fluid change required.
Scored cylinder tube or rod - Change damaged component.

Hydraulic pump is noisy
Not enough oil or hydraulic system leaking - Correct hydraulic leaks or top up oil as needed.
Clogged hydraulic filter - Clean or change the filter.
Dirty suction line - Clean suction line as required.
Air trapped in hydraulic pump - Air bleeding is required.
Worn pump parts - Replace or rebuild the pump.

Electrical Troubleshooting

Battery does not charge
Corroded or loose electrical wire connections - Clean or tighten connections.
Electrical terminal connectors are faulty - Install new terminal connectors.
Battery bad cell - Change the battery.
Belt is defective or loose - Belt needs to be adjusted or changed.

Starter turning slow
Low battery power - Battery is drained, recharge it.
Battery does not hold charge - Service battery or replace it.
Disconnected battery cables or bad terminals - Check cable connections and change or clean terminals.

Starter motor won't turn
Battery is discharged or worn - Recharge or replace battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery output - Recharge the battery.
Starter motor is damaged - Repair or replace starter.