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Bobcat 722 Troubleshooting

The Bobcat 722 skid steer loader is powered by 98 cu.in (1.6L) Ford 1498 four-cylinder liquid-cooled gasoline engine with a rated power of 33 hp (22 kW) at 2800 rpm. The Bobcat 722 is equipped with a radial-lift loader boom, single-speed or two-speed hydrostatic transmission, 80H drive chains, and 7.00x15 standard tires. The hydraulic system has a pump with fluid flow rate of 10 gpm (37.9 lpm). The hydraulic pressure is 2100 psi (145 bar). The skid steer loader has a rated operating capacity of 1200 lbs (540 kg) and tipping load of 2400 lbs (1080 kg). The lift height is 109 inches (2770 mm) to hinge pin, and dump height is 86 inches (2185 mm).

Engine Troubleshooting

Engine is not starting or hard starting
No fuel in fuel tank - Fill it up.
Wrong fuel grade - Use correct fuel grade.
Air in fuel system - Bleed fuel system.
Disconnected or loose spark plug wire - Inspect the spark plug wire connection, replace or repair.
Damaged spark plug - Change spark plug as required.
Ignition system malfunction - Check ignition system and replace faulty parts.
Plugged fuel filter - Replace fuel filter.
Fuel lines clogging - Service fuel lines.
Clogged or defective fuel pump - Service or change fuel pump.
Carburetor is not adjusted - Check carburetor float adjustment.
Engine has low compression - Check cylinder block and replace defective parts.

Engine runs irregularly
Ignition system failure - Inspect ignition system and change faulty parts.
Plugged air filter - Clean or change.
Spark plug is faulty - Replace spark plug.
Dirty or damaged fuel pump - Test fuel pump and replace if necessary.
Excessive valve clearance - Adjust to proper valve clearance.
Wrong ignition timing - Set the ignition timing correctly.
Incorrect low idle setting - Adjust idle speed.

Engine starts but stalls suddenly
Damaged spark plug - Replace spark plug.
Carburetor is dirty or defective - Service or change carburetor.
Ignition coil is defective - Install a new ignition coil.
Loose or broken valve springs - Replace valve springs.
Valves sticking - Valves must be cleaned.

Engine is overheated
Engine oil level low - Need to add engine oil.
Engine is overloaded - Reduce load.
Carburetor mixture is too lean - Set the carburetor properly.
Wrong ignition timing - Set the ignition timing properly.
Incorrect valve setting - Adjust valves correctly.
Dirty radiator core or faulty radiator cap - Clean radiator or replace cap.
Low engine coolant - Add coolant and check the components of cooling system.
Damaged thermostat - Change thermostat.
Water pump failure - Change water pump.

Abnormal engine noise or knocking
Stale or low octane fuel - Change fuel.
Excessive engine load - Reduce load.
Engine oil level is low - Checking oil level and add if necessary.
Low idle speed set incorrectly - Adjust idle speed.
Dirty or damaged fuel pump - Clean or change fuel pump.
Crankshaft or main bearings are worn out - Repair or replace defective parts.
Incorrect valve clearance - Adjust to proper valve clearance.
Worn cylinder bore or piston rings - Replace defective parts.

Engine power loss
Dirty or incorrectly adjusted carburetor - Carburetor needs to be adjusted correctly or cleaned.
Plugged air filter - Replace or service air filter.
Clogged or damaged fuel pump - Check fuel pump and replace if necessary.
Ignition system problems - Check ignition system and replace faulty parts.
Blown cylinder head gasket - Replace the gasket as required.
Stuck or burned valves - Service or replace valves.
Faulty cylinder block components - Replace defective parts as required.
Oil filter is dirty - Replace or service oil filter.

Excessive fuel consumption
Air filter element is plugged - Service or change air filter.
Improper carburetor main jet adjustment - Adjust it properly.
Defective or loose spark plug - Re-tighten or replace spark plug.
Wrong ignition timing - Ignition timing needs to be adjusted correctly.
Valves are stuck, burned, or worn - Change or service valves.
Worn sleeve, piston, or rings - Replace defective components.
Valve clearance is wrong - Adjust valve clearance.
Low compression - Check and replace worn parts.

Engine consuming too much oil
Seals or gaskets are defective - Replace worn parts to avoid leaks.
Valve guides or stems are damaged - Valves need to be changed.
Damaged or seized piston rings - Replace piston rings.
Cylinder liner or piston is worn - Inspect liner and piston, fit new parts as necessary.

Engine backfires
Carburetor mixture is too lean - Set the carburetor correctly.
Fuel lines are dirty - Service fuel lines.
Improper ignition timing - Set the ignition timing properly.
Valve setting is wrong - Adjust valves correctly.
Air filter element is clogged - Service or replace air filter.

Drive System Troubleshooting

Machine will not move in either direction or one direction
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Worn drive chain - Inspect drive chain and replace defective parts.
Damaged input drive shaft - Service or change drive shaft.
Relief valve is stuck - Repair or replace.
Dirty hydraulic filter or suction line - Check, clean, or replace if required.
Faulty foot or hand controls - Change or repair.
Drive motor or pump is defective - Change or repair faulty component.

Reduced power
Hydraulic oil filter is clogged - Check, clean, or change as necessary.
Relief valve is opened or defective - Close or replace relief valve.
Worn or faulty transmission components - Inspect and change faulty parts.
Input drive shaft is stuck - Service or change faulty drive shaft.
Air trapped in hydraulic system - Need to bleed air.

Drive system keeps overheating
Hydraulic fluid level low - Fill up the hydraulic fluid.
Hydraulic fluid filter is dirty - Replace or clean hydraulic filter.
Stuck relief valve - Change or repair defective relief valve.
Hydraulic motor or drive pump failure - Repair or replace faulty component.
Hydraulic oil cooler is plugged - Clean the cooling fins.
Drive system is overloaded - Reduce loading.

Excessive noise
Incorrect oil viscosity - Use proper oil viscosity.
Air leaks in hydraulic system - Bleed air from hydraulic system.
Worn hydraulic motor or drive pump - Change or repair faulty component.
Mechanical parts of drive system are damaged or worn - Inspect the parts for worn or defect and repair as needed.

Hydraulics Troubleshooting

Hydraulic system is overheated
Incorrect hydraulic pressure setting - Adjust pressure as required.
Main relief valve failure or improper setting - Set up or change the relief valve.
Dirty hydraulic oil - The oil must be changed.
Not enough hydraulic oil in the system - Fill up the hydraulic oil.
Hydraulic pump is faulty - Repair or install new hydraulic pump.

Lift arm can't drop or lift
Lift controls failure - Check and repair as required.
Hydraulic pump not working - Repair or change pump if required.
Hydraulic control valve is defective - Repair or change hydraulic valve.
Broken hydraulic cylinder - Install a new boom cylinder or repair it.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.

Bucket is not working
Damaged bucket controls - Check and repair as required.
Hydraulic pump is broken - Replace or repair pump if necessary.
Hydraulic control valve failure - Install a new valve or repair it.
Damaged bucket cylinder - Replace or repair cylinder.
Hydraulic oil level low - Need to add oil.

Boom or bucket functions slowly
Faulty hydraulic oil pump - Check pump capacity and change if necessary.
Oil leaks from hydraulic cylinder - Replace cylinder piston seals.
Low hydraulic fluid level - Fill up the hydraulic fluid.
Hydraulic control valve is defective or set improper - Repair or adjust properly.
Hydraulic pressure is low - Set pressure correctly.

Lift arm or bucket is working jerkily
Air leaks in hydraulic system - Bleed air from system.
Dirty hydraulic oil filter element - Change or clean oil filter.
Hydraulic fluid is dirty - Hydraulic fluid change required.
Scored cylinder tube or rod - Replace damaged component.

Hydraulic pump is excessively noisy
Insufficient oil level or leaking hydraulic system - Refill hydraulic oil or repair leaks in system.
Plugged hydraulic filter - Service or replace hydraulic filter.
Suction line clogging - Service the suction line.
Air enters the pump - Air bleeding is required.
Damaged pump components - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery cannot be charged
Corroded or loose wire connections - Clean or tighten connections.
Defective battery terminal clamps - Terminal clamps need to be replaced.
Battery is defective - Replace the battery.
Worn or loose belt - Belt needs to be adjusted or changed.

Starter motor cranks slow
Battery power is low - Recharge the battery.
Battery is draining quickly - Service battery or change it.
Disconnected cables or faulty battery terminals - Connect wiring correctly or install new terminals.

Starter will not crank
Battery is low or faulty - Recharge or change battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery power - Battery is drained, charge it.
Starter motor is damaged - Starter needs to be replaced.