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| Home / Skid Steer Loaders / Bobcat Skid Steer Loaders / Bobcat 630 |
Bobcat 630 Troubleshooting
The
Clark Bobcat 630 skid steer loader is powered by 107.7 cu.in (1.8L) Wisconsin
VH4D 4-cycle 4-cylinder gasoline engine with a rated power of 28 hp (20.9 kW) at
2400 rpm. The Clark Bobcat 630 is equipped with an one-speed hydrostatic
transmission, radial-lift loader boom, 80H drive chains, and 7.00x15 standard
tires. The open center hydraulic system has a gear pump with fluid flow rate of
9.5 gpm (36 lpm). The hydraulic pressure is 2500 psi (172 bar). The skid steer
has a rated operating capacity of 1000 lbs (450 kg) and tipping load of 2000 lbs
(900 kg). The maximum lift height is 108.7 inches (2760mm) to hinge pin, and
dump height is 86.3 inches (2190 mm).
| Engine Troubleshooting |
Engine starts hard or won't start
No gasoline in tank - Add gasoline.
Wrong grade of gasoline - Use quality gasoline.
Dirty fuel lines - Inspect and clean.
Damaged spark plug wiring connection - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Spark plug need to be replaced.
Ignition system failure - Check ignition system and replace faulty parts.
Plugged fuel filter - Fuel filter needs changing.
Dirt in the fuel lines - Clean fuel lines.
Clogged or defective fuel pump - Inspect fuel pump and change as required.
Carburetor problems - Carburetor diagnostics required.
Bad compression - Check and change damaged parts.
Rough engine running
Ignition failure - Inspect ignition system and change failed components.
Air filter is blocked - Clean or change filter.
Spark plug is damaged - Change spark plug.
Fuel pump is faulty or clogged - Clean or change fuel pump.
Excessive valve clearance - Adjustment procedure required.
Incorrect ignition timing - Set the ignition timing properly.
Low idle speed setting is incorrect - Adjust idle speed.
Engine starts and stops suddenly
Spark plug is damaged - Install new spark plug.
Carburetor is faulty or dirty - Service or replace carburetor.
Defective ignition coil - Install a new ignition coil.
Bad or damaged valve springs - Valve springs need to be changed.
Valves are stuck - Clean the valves.
Engine overheats
Engine oil level is low - Checking oil level and add if necessary.
Engine is overloaded - Load reducing is recommended.
Too lean fuel mixture in carburetor - Set the carburetor correctly.
Wrong ignition timing - Set the ignition timing properly.
Improper valve setting - Set the valves correctly.
Damaged radiator cap or dirty radiator core - Clean radiator or change cap.
Engine has a lack of coolant - Add coolant fluid to cooling system and also check it for leaks.
Thermostat is faulty - Change thermostat.
Defective water pump - Replace water pump.
Abnormal engine noise or knocking
Low octane gasoline - Change fuel.
Engine overload - Load reducing required.
Insufficient engine oil - Checking oil level and add if necessary.
Incorrectly set low idle speed - Correct the settings.
Fuel pump is faulty or clogged - Service or replace fuel pump.
Worn main bearings or crankshaft - Worn parts replacement required.
Valve clearance is incorrect - Check and adjust.
Cylinder bore or piston rings are worn - Change faulty components.
Lack of engine power
Carburetor is incorrectly adjusted or dirty - Service or properly adjust carburetor.
Air filter is blocked - Replace or service air filter.
Dirty or faulty fuel pump - Test fuel pump and change if necessary.
Defective ignition - Test ignition and replace failed parts.
Cylinder head gasket is damaged - Install new head gasket.
Valves are burned or stuck - Change or clean valves.
Cylinder block parts are damaged - Defective components need to be replaced.
Clogged oil filter - Service or change oil filter.
Excessive fuel consumption
Air filter is blocked - Replace or service air filter.
Carburetor main jet is incorrectly adjusted - Adjust it properly.
Loose or defective spark plug - Re-tighten or replace spark plug.
Incorrect ignition timing - Adjust ignition timing as required.
Valves are stuck, worn, or burned - Change or clean valves.
Worn piston, rings, or sleeve - Change defective parts.
Valve clearance is improper - Check and adjust.
Bad compression - Check and change damaged parts.
Excessive engine oil consumption
Worn gaskets or seals - Change worn parts according to specifications.
Worn valve guides and valve stems - Valves need to be changed.
Damaged or seized piston rings - Piston rings need to be replaced.
Cylinder liner or piston is worn - Check liner and piston, change as required.
Engine backfires
Carburetor mixture is too lean - Use proper settings.
Fuel lines clogging - Fuel lines must be clean.
Improper ignition timing - Set the ignition timing correctly.
Valve setting is incorrect - Adjust valves as required.
Clogged air filter - Replace or clean air filter.
| Drive System Troubleshooting |
Drive system сan't work in either direction
Hydraulic fluid level low - Fill up the hydraulic fluid.
Drive chain fault - Inspect drive chain and replace faulty parts.
Defective relief valve - Repair or change.
Hydraulic filter or suction line is dirty - Clean suction line or replace hydraulic filter.
Hand or foot controls malfunction - Repair or replace.
Drive pump or motor malfunction - Change or repair faulty component.
Low power
Clogged hydraulic oil filter - Check, clean, or change as necessary.
Opened or worn relief valve - Replace or close relief valve.
Transmission components are defective or worn - Inspect and replace faulty parts.
Worn input drive shaft - Repair or replace faulty drive shaft.
Air leaks in hydraulic system - Bleed hydraulic system.
Drive system is overheated
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.
Hydraulic fluid filter is clogged - Check, clean, or replace as required.
Relief valve worn or defective - Repair or install a new relief valve.
Worn hydraulic motor or drive pump - Change or repair faulty component.
Clogged hydraulic oil cooler - Clean the cooling fins.
Drive system overloaded continuously - Reduce drive system load.
Drive system is excessively noisy
Oil viscosity is too heavy - Drain and refill with correct oil.
Air trapped in hydraulic system - Bleed hydraulic system.
Drive pump or hydraulic motor is damaged - Repair or replace faulty component.
Defective or worn mechanical components of drive system - Check the parts for defect or damage and change if required.
| Hydraulics Troubleshooting |
Hydraulic system overheated
Hydraulic pressure incorrectly adjusted - Adjust it correctly.
Main relief valve improper adjustment or failure - Adjust relief valve or change if required.
Dirty hydraulic oil - Change hydraulic oil.
Hydraulic oil level is low - Check oil level and add hydraulic oil as required.
Hydraulic pump is worn - Repair or replace pump if necessary.
Lift arm does not lower or raise
Lift controls are defective - Repair or replace.
Hydraulic pump malfunction - Change or repair hydraulic pump if required.
Hydraulic control valve is defective - Install a new valve or repair it.
Faulty hydraulic cylinder - Install a new boom cylinder or repair it.
Insufficient hydraulic oil - Fill the system to proper hydraulic oil level.
Bucket won't move
Damaged bucket controls - Inspect and repair if necessary.
Damaged hydraulic oil pump - Change or repair hydraulic pump if required.
Damaged hydraulic control valve - Repair or change hydraulic valve.
Broken bucket cylinder - Repair or change cylinder.
Hydraulic fluid is insufficient - Fill up the hydraulic fluid.
Slow bucket or lift arm operation
Faulty hydraulic oil pump - Check pump flow and change pump if necessary.
Hydraulic cylinder leaking - Replace cylinder piston seals.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Hydraulic control valve is unadjusted or worn - Repair or adjust correctly.
Low hydraulic pressure - Adjust pressure as required.
Bucket or boom is working jerkily
Air trapped in hydraulic system - Air bleeding is required.
Hydraulic oil filter is clogged - Change or clean oil filter.
Contaminated hydraulic oil - The oil must be changed.
Scratched cylinder rod or tube - Replace failed component.
Excessive hydraulic pump noise
Leaking hydraulic system or insufficient oil level - Repair hydraulic leaks or add oil as required.
Clogged hydraulic filter - Clean or install new filter.
Suction line is dirty - Clean suction line as required.
Pump sucks air - Remove air from hydraulics.
Damaged pump components - Rebuild or replace hydraulic pump.
| Electrical Troubleshooting |
Battery won’t charge
Loose or corroded electrical wiring connections - Clean or tighten connections.
Battery terminal clamps are defective - Terminal clamps need to be replaced.
Battery is defective - Change the battery.
Defective or loose belt - Belt needs to be adjusted or replaced.
Starter motor cranks slow
Low battery output - Charge the battery.
Battery drains quickly - Service or change the battery.
Battery cables are disconnected or terminals are faulty - Connect wiring correctly or install new terminals.
Starter will not crank
Battery is drained or defective - Charge or change the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery capacity - Battery is drained, charge it.
Starter motor is damaged - Repair or change starter.
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| SKID STEER LOADERS SPECIFICATIONS |