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Bobcat S510 Troubleshooting

The Bobcat S510 skid steer loader driveline system components: Kubota V2203 diesel engine with a rated power of 49 hp (36.4 kW) or Kubota V2403 diesel engine with a rated power of 49 hp (36.4 kW), and 1-speed or 2-speed transmission. The hydraulic system has a pump with a rated capacity of 17.1 gal/min (64.7 l/min). The system relief pressure is 3550 psi (245 bar). The Bobcat S510 is equipped with a radial-lift loader boom, 80 HSOC roller chains, and 10x16.5 tires. The skid steer has a max lift height of 114.5" (2910 mm) to hinge pin and dump height of 86.8" (2205 mm). The rated operating capacity is 1650 lbs (748 kg), and tipping load is 3300 lbs (1497 kg).

Engine Troubleshooting

Engine starts up hard or won't start
Air in the fuel system - Air bleeding.
Clogged fuel filter - Replace filter element.
Fuel injection nozzles are faulty or clogged - Clean or change injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Excessive valve clearance - Check and adjust as required.
Faulty fuel injection pump - Repair or change injection pump.

Diesel starts but immediately shuts off
Air filter is dirty - Service or replace the air filter.
Fuel filter plugged - Install new filter element.
Fuel injection pump is leaking - Repair any leaks.
Clogged or defective injectors - Change or clean fuel injectors.
Fuel injection pump malfunctioning - Replacement or repair required.

Engine stalls after running
Engine is cold - Warm up the engine.
Fuel filter element is dirty - Replace the filter element.
Air trapped in fuel system - Bleed air.
Dirty or faulty injection nozzles - Check injection nozzles and replace if required.
Improper setting of fuel injection pump timing - Adjust according to specifications.

Engine stops while idling
Incorrectly adjusted low idle speed - Normalize low idle speed.
Fuel injection pump is faulty - Replace or repair injection pump.
Defective fuel injectors - Clean fuel injectors or change it.
Excessive valve clearance - Adjust to proper valve clearance.

Engine loses power
Clogged air filter - Service or replace the air filter.
Faulty fuel injection nozzles - If necessary, replace with a new nozzle.
Uneven fuel injection pressure - Adjust to proper pressure.
Improper valve clearance - Check and adjust.
Too low idle RPM - Adjust low idle speed.
Fuel lines or hoses clogging - Service fuel lines and hoses.
Leaking cylinder head gasket - Install a new gasket.
Damaged or leaking piston rings - Replace piston rings.

Engine overheating
Insufficient coolant fluid - Add coolant and check the components of cooling system.
Not enough engine oil - Add oil to the engine crankcase.
Radiator core is dirty or radiator cap is damaged - Clean radiator or install new cap.
Loose or damaged fan belt - Belt change is required.
Engine is overloaded - Reduce engine load.

Low oil pressure
Engine oil level low - Fill crankcase to proper oil level.
Oil filter is dirty - Replace or clean engine oil filter element.
Improper type of engine oil - Drain and refill with oil of correct grade and viscosity.
Crankshaft bearing oil clearance is incorrect - Install new bearings.
Oil pump malfunction - Remove and inspect oil pump.

Engine knocking sound or abnormal noise
Engine oil level is insufficient - Need to add engine oil.
Engine has not warmed up to recommended temperature - Warm up the engine.
Improper fuel injection timing - Adjust fuel injection pump as required.
Improperly adjusted low idle speed - Correct the settings.
Damaged or clogged injectors - Clean fuel injectors or change it.
Connecting rod is defective or not aligned - Connecting rod must be aligned or replaced.
Pistons are scored or worn - Replace the pistons as required.

Drive System Troubleshooting

Drive system сan't work in either direction
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.
Drive chain is worn - Check drive chain and change faulty parts.
Input drive shaft failure - Service or change drive shaft.
Stuck relief valve - Service or change relief valve.
Suction line or hydraulic filter is clogged - Clean suction line or change hydraulic filter.
Faulty hand or foot controls - Repair or change.
Drive motor or pump is defective - Repair or change faulty component.

Low power
Dirty hydraulic oil filter - Replace or service hydraulic filter.
Open or damaged relief valve - Replace or close relief valve.
Defective or worn transmission parts - Check and change defective components.
Input drive shaft is damaged - Service or change faulty drive shaft.
There is air in the hydraulic system - Bleed air from hydraulic system.

Overheated drive system
Hydraulic oil level is low - Checking hydraulic oil level and add if necessary.
Hydraulic fluid filter is plugged - Check, clean, or replace as required.
Relief valve malfunction - Repair or install a new relief valve.
Hydraulic motor or drive pump failure - Repair or change faulty component.
Dirty oil cooler - Clean cooling fins as required.
Transmission overloading - Reduce the load.

Drive system is excessively noisy
Wrong oil viscosity - Use oil of correct viscosity.
Air leaks in hydraulic system - Bleed air from system.
Drive pump or hydraulic motor is damaged - Repair or change faulty component.
Defective or worn mechanical parts of drive system - Check the components for defect or damage and change if necessary.

Hydraulics Troubleshooting

Hydraulic system overheating
Hydraulic pressure is incorrect - Correct setting is required.
Defective or misadjusted main relief valve - Set up or change the relief valve.
Dirty hydraulic oil - The oil must be changed.
Not enough hydraulic oil in the system - Add oil to the hydraulic system.
Hydraulic pump is worn - Change or repair hydraulic pump if required.

Boom does not raise or lower
Lift controls are faulty - Change or repair.
Hydraulic pump is broken - Replace or repair pump if necessary.
Faulty hydraulic control valve - Replace or repair the valve.
Damaged hydraulic cylinder - Repair or install a new lift cylinder.
Hydraulic oil level low - Fill the system to proper hydraulic oil level.

Bucket does not function
Defective bucket controls - Repair or replace.
Defective hydraulic pump - Repair or replace pump if necessary.
Hydraulic control valve failure - Change or repair hydraulic valve.
Bucket cylinder is faulty - Change or repair cylinder.
Insufficient hydraulic fluid - Fill the system to proper hydraulic fluid level.

Boom or bucket is moving slowly
Hydraulic pump is faulty - Test pump performance and replace pump if necessary.
Hydraulic cylinder leaking - Change cylinder piston seals.
Low hydraulic fluid level - Fill up the hydraulic fluid.
Worn or unadjusted hydraulic control valve - Repair or set correctly.
Hydraulic pressure loss - Adjust pressure correctly.

Bucket or boom is working jerkily
Air leaks in hydraulic system - Bleed hydraulic system.
Hydraulic oil filter is dirty - Service or replace the hydraulic filter.
Hydraulic oil is dirty - Fill up with fresh hydraulic oil.
Cylinder rod or tube is scuffed - Change defective component.

Hydraulic pump is excessively noisy
Insufficient oil level or leaking hydraulic system - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter is clogged - Clean or replace the filter.
Suction line clogging - Suction line must be serviced.
Air trapped in hydraulic pump - Remove air from hydraulics.
Damaged pump components - Replace or rebuild the pump.

Electrical Troubleshooting

Battery cannot be charged
Electrical wire connections are loose or corroded - Clean or tighten wiring connections.
Defective battery terminal clamps - Terminal clamps need to be replaced.
Battery dead cell - Change the battery.
Loose or damaged belt - Replace belt or adjust belt tension.

Starter turning slow
Low battery capacity - Battery is drained, charge it.
Battery is not holding charge - Battery needs service or replacement.
Wires are disconnected or battery terminals are corroded - Connect wires correctly or change terminals.

Starter doesn't crank
Battery is low or faulty - Recharge or change battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery power - Charge the battery.
Starter motor is defective - Starter should be replaced.