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Bobcat S220 Troubleshooting

The Bobcat S220 skid steer loader is powered by Kubota V3300-TE diesel engine with a rated power of 78 hp (58 kW) or Kubota V3800-DI-TE3 with a rated power of 75 hp (56 kW). The Bobcat S220 is equipped with 1-speed or 2-speed hydro transmission, radial-lift loader boom, 120 HSOC continuous roller chains, and 12x16.5 or 33-15.5x16.5 tires. The hydraulic system has a pump with fluid flow rate of 20.7 gpm (78.4 lpm). The hydraulic pressure is 3300 psi (228 bar). The skid steer has a rated operating capacity of 2200 lbs (998 kg) and tipping load of 4400 lbs (1996 kg). The boom lifting force is 4500 lbs (2045 kg), and bucket breakout force is 5000 lbs (2272 kg).

Engine Troubleshooting

Diesel hard to start or doesn't start
Air in fuel system - Bleed fuel system.
Dirty fuel filter - Service the filter.
Clogged or burnt injection nozzle - Test injection nozzles and change if necessary.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is wrong - Adjust valve clearance.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.

Diesel starts and suddenly stops
Air filter is plugged - Replace or clean air filter element.
Fuel filter element is clogged - Change filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Clogged or defective injectors - Change or clean fuel injectors.
Damaged fuel injection pump - Repair or change injection pump.

Engine stops unexpectedly during operation
Low coolant temperature - Warm up the engine.
Clogged fuel filter - Service or replace the filter.
Air in fuel system - Bleed fuel system.
Clogged or defective injection nozzles - Test injection nozzles and change if necessary.
Incorrect adjustment of fuel injection pump timing - Adjust as recommended.

Engine stops at low idle speed
Too low idle RPM - Correct low idle adjustment.
Fuel injection pump malfunctioning - Rebuild or install a new injection pump.
Clogged or defective injectors - Replace fuel injectors.
Valve clearance is not correct - Check and adjust.

Loss of engine power
Air filter is clogged - Service or replace the air filter.
Dirty or damaged injection nozzles - Check injection nozzles and replace if required.
Uneven fuel injection pressure - Correct the pressure settings.
Valve clearance is out of adjustment - Check and adjust as required.
Improperly adjusted low idle speed - Need to adjust idle speed.
Clogged fuel lines or hoses - Clean fuel lines and hoses.
Cylinder head gasket is worn - Replace the gasket as required.
Defective or worn piston rings - Piston rings replacement required.

Engine overheats
Insufficient coolant fluid - The cooling system needs to be refilled and checked for faults.
Engine oil level is low - Fill up the engine oil.
Radiator core is dirty or radiator cap is damaged - Clean radiator or change cap.
Fan belt slipping or worn - If necessary, replace the belt.
Engine is under excessive load - Load reducing required.

Low oil pressure
Engine oil insufficient - Check oil level and add oil as required.
Oil filter element clogging - Clean or replace engine oil filter element.
Wrong oil viscosity - Drain and refill with oil of correct grade and viscosity.
Excessive crankshaft bearing oil clearance - Bearing needs to be changed.
Worn oil pump - Repair or replace.

Engine noise or knocking
Insufficient engine oil - Add oil to the engine crankcase.
Low coolant temperature - Warm up the engine.
Improper fuel injection timing - Set up as recommended.
Low idle speed set incorrectly - Adjust low idle speed.
Defective fuel injectors - Inspect fuel injectors and change as required.
Connecting rod misalignment or failure - Need to change or align the connecting rod.
Worn or broken pistons - Replace the pistons as required.

Drive System Troubleshooting

Machine is not moving in one direction or either direction
Low hydraulic fluid level - Checking hydraulic fluid level and add if necessary.
Faulty drive chain - Inspect drive chain and replace faulty parts.
Input drive shaft failure - Replace or service the drive shaft.
Relief valve malfunction - Rebuild or install a new relief valve.
Plugged hydraulic filter or suction line - Replace hydraulic filter or clean suction line.
Worn or damaged foot or hand controls - Repair or replace.
Worn drive motor or pump - Repair or replace faulty component.

Loss of power
Plugged hydraulic oil filter - Replace hydraulic filter.
Relief valve is worn or opened - Close or change relief valve.
Transmission parts are defective or worn - Inspect and replace defective parts.
Input drive shaft failure - Rebuild or change the shaft.
Air trapped in hydraulic system - Air bleeding is required.

Overheated drive system
Hydraulic fluid is insufficient - Add fluid as required.
Dirty hydraulic fluid filter - Replace or clean hydraulic filter.
Relief valve defective or worn - Change or repair relief valve.
Hydraulic motor or drive pump failure - Replace or repair faulty component.
Oil cooler is clogged - Cooling fins should be cleaned.
Drive system overload - Reduce loading.

Drive system is noisy
Wrong oil viscosity - Use the specified type of oil.
There is air in the hydraulic system - Air bleeding is required.
Hydraulic motor or drive pump is defective - Change or repair faulty component.
Mechanical components of drive system are damaged or worn - Inspect drive system and replace faulty components.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not adjusted correctly - Correct adjustment is required.
Main relief valve malfunction or improper adjustment - Set up or change the relief valve.
Hydraulic fluid contamination - The fluid must be changed.
Hydraulic fluid level is low - Check and refill the hydraulic fluid.
Defective hydraulic pump - Change or repair hydraulic pump if required.

Lift arm does not lower or raise
Defective lift controls - Repair or change.
Hydraulic pump malfunction - Repair or install new hydraulic pump.
Hydraulic control valve is faulty - Change or repair hydraulic valve.
Hydraulic cylinder malfunction - Repair or replace hydraulic cylinder.
Hydraulic oil is insufficient - Need to add oil.

Bucket won't move
Bucket tilt controls are damaged - Replace or repair.
Defective hydraulic pump - Repair or replace pump if necessary.
Hydraulic control valve failure - Replace or repair the valve.
Hydraulic bucket cylinder not working - Change or repair cylinder.
Low hydraulic fluid level - Fill up the hydraulic fluid.

Slow boom or bucket operation
Faulty hydraulic oil pump - Test the pump performance and change pump if required.
Hydraulic cylinder leaking - Replace cylinder piston seals.
Low hydraulic oil level - Need to add oil.
Hydraulic control valve is not set properly or defective - Adjust correctly or repair.
Hydraulic pressure loss - Adjust pressure correctly.

Lift arm or bucket is moving jerkily
Hydraulic system is leaking air - Need to bleed air.
Clogged hydraulic oil filter element - Clean or replace the filter.
Hydraulic oil contamination - Change hydraulic oil.
Cylinder tube or rod is scored - Replace defective component.

Hydraulic pump is noisy
Lack of oil or hydraulic leakage - Add hydraulic oil or correct system leaks.
Clogged hydraulic filter - Clean or replace the filter.
Suction line is dirty - Need to clean the suction line.
Pump sucks air - Bleed air from hydraulics.
Pump parts are worn out - Rebuild or replace hydraulic pump.

Electrical Troubleshooting

Battery is not charging
Loose or corroded cable connections - Tighten or service cable connections.
Electrical terminal connectors are defective - Replace terminal connectors.
Battery faulty cell - Replace the battery.
Belt is defective or loose - Adjust belt tension or change the belt.

Starter cranks slowly
Low battery output voltage - Battery needs to be recharged.
Battery runs out quickly - Service charging system or install new battery.
Wires are disconnected or battery terminals are corroded - Check cable connections and change or clean terminals.

Starter doesn't crank
Battery is discharged or worn - Recharge or change battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery power is low - Battery needs to be recharged.
Faulty starter motor - Starter needs to be replaced.