Home / Skid Steer Loaders / Bobcat Skid Steer Loaders / Bobcat M371

Bobcat M371 Troubleshooting

The Bobcat M371 skid steer loader driveline system components: a 31.3 cu.in (0.5L) Kohler K321S L-head single-cylinder air-cooled gasoline engine with a rated power of 13 hp (9.6 kW), and 2-speed V-belt transmission. The hydraulic system has a pump with a rated capacity of 5 gal/min (19 l/min). The system relief pressure is 1200 psi (83 bar). The Bobcat M371 is equipped with a radial-lift loader boom, 60H drive chains, and 5.70x12 or 23x8.50x12 tires. The skid steer loader has a max lift height of 89" (2260 mm) to hinge pin and dump height of 71" (1805 mm). The rated operating capacity is 500 lbs (227 kg), and tipping load is 900 lbs (410 kg).

Engine Troubleshooting

Engine doesn't start or difficult to start
Gas tank is empty - Fill gasoline up.
Wrong fuel grade - Change gasoline.
Air or water in fuel system - Remove water or air from fuel system.
Spark plug wire is disconnected or loose - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Change spark plug.
Fuel filter is dirty - Replace fuel filter.
Brake pedal not depressed - Press the brake pedal.
Carburetor is not adjusted - Check carburetor float adjustment.
Poor engine compression - Check cylinder block and replace damaged components.
Throttle cable is damaged or adjusted incorrectly - Change cable or adjust correctly.

Irregular engine running
Air intake screen is plugged - Wash or clean as required.
Ignition system problems - Inspect ignition system and change faulty parts.
Choke cable is faulty or stuck - Change or service the cable.
Air filter element is plugged - Clean or replace air filter.
Clogged or damaged fuel pump - Inspect fuel pump and change as required.

Engine starts but then stops
Spark plug is faulty - Spark plug need to be replaced.
Carburetor is clogged or faulty - Clean or change carburetor.
Damaged ignition coil - Replace ignition coil as necessary.
Valve springs are bad or broken - New valve springs need to be installed.
Valves sticking - Valves must be cleaned.

Engine keeps overheating
Low engine oil level - Fill up the engine oil.
Engine is under excessive load - Reduce load.
Clogged cooling fins - Need to wash or clean.
Too lean carburetor mixture - Adjust carburetor correctly.
Ignition timing is incorrect - Adjust ignition timing correctly.
Valve setting is wrong - Set the valves correctly.

Engine knocking or noise
Stale fuel - Change fuel.
Engine is running overloaded - Reduce the load.
Low engine oil level - Need to add engine oil.
Incorrectly adjusted low idle speed - Adjust idle speed.
Fuel pump is damaged or dirty - Inspect fuel pump and change as required.
Main bearings or crankshaft are worn out - Replace crankshaft or bearings.
Valve clearance is not correct - Adjustment procedure required.
Piston rings or cylinder bore are worn - Replace defective components.

Engine loses power
Carburetor is dirty or incorrectly adjusted - Service or properly adjust carburetor.
Air filter element is plugged - Change or clean air filter.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Ignition system problems - Test ignition and replace failed parts.
Worn cylinder head gasket - Install new head gasket.
Stuck or burned valves - Service or replace valves.
Push rod is worn or bent - Change push rod.
Cylinder block parts are damaged - Change defective parts.
Oil filter element is plugged (if equipped) - Replace or service oil filter.

Engine uses too much fuel
Choke opening is not full - Replace or adjust choke cable.
Carburetor main jet adjustment is improper - Adjust it correctly.
Loose or faulty spark plug - Tighten or replace spark plug.
Worn, stuck, or burned valves - Replace or service valves.
Worn sleeve, piston, or rings - Replace faulty components.
Valve clearance is wrong - Check and adjust.

Engine oil consumption is too high
Seals or gaskets are defective - Worn parts need to be replaced.
Valve guides or stems are damaged - Valves must be replaced.
Stuck or defective piston rings - Install new piston rings.
Piston or cylinder liner is worn - Inspect liner and piston, replace as necessary.
Plugged breather hose or pipe - Service or change.

Drive System Troubleshooting

Drive system will not operate in either direction
Hydraulic fluid level low - Add fluid as required.
Drive chain is worn - Check drive chain and change defective components.
Defective or worn relief valve - Repair or install a new relief valve.
Clogged suction line or hydraulic filter - Change hydraulic filter or service suction line.
Foot or hand controls are damaged - Repair or change.

Power is too low
Hydraulic oil filter is clogged - Replace or clean hydraulic filter.
Defective or worn transmission parts - Check and change defective components.
Input drive shaft is damaged - Rebuild or change the shaft.
Hydraulic system is leaking air - Bleed air from system.

Drive system keeps overheating
Hydraulic fluid level low - Checking hydraulic fluid level and add if necessary.
Clogged hydraulic fluid filter - Change or service hydraulic filter.
Transmission parts are worn or damaged - Repair or replace.
Transmission overloading - Reduce drive system load.

Drive system is excessively noisy
Incorrect oil viscosity - Use proper oil viscosity.
Air leaks in hydraulic system - Air bleeding is required.
Transmission parts are worn or damaged - Repair or change faulty component.
Mechanical parts of drive system are worn or damaged - Check the parts for defect or damage and change if required.

Hydraulics Troubleshooting

Hydraulic system overheated
Hydraulic pressure is not correct - Adjust pressure as required.
Main relief valve is damaged or adjusted improperly - Adjust the valve or replace if necessary.
Hydraulic oil contamination - Hydraulic oil change required.
Lack of hydraulic oil - Check oil level and add hydraulic oil as required.
Worn hydraulic oil pump - Change or repair hydraulic pump if required.

Lift arm cannot be raised or lowered
Faulty lift controls - Inspect and repair if necessary.
Hydraulic pump not working - Change or repair hydraulic pump if required.
Hydraulic control valve is faulty - Repair or replace the valve.
Hydraulic cylinder failure - Repair or install a new lift cylinder.
Insufficient hydraulic oil - Fill the system to proper hydraulic oil level.

Bucket fails to tilt
Faulty bucket tilt controls - Repair or replace.
Defective hydraulic pump - Repair or install new hydraulic pump.
Defective hydraulic control valve - Change or repair hydraulic valve.
Bucket cylinder failure - Repair or change cylinder.
Hydraulic oil is insufficient - Checking hydraulic oil level and add if necessary.

Slow bucket or lift arm action
Hydraulic pump is faulty - Check the pump performance and replace it if required.
Leaking hydraulic cylinder - Install new cylinder seals.
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.
Hydraulic control valve is defective or set improper - Repair or adjust correctly.
Hydraulic pressure loss - Adjust pressure as required.

Bucket or boom jerks when working
Hydraulic system is leaking air - Bleed air from system.
Hydraulic oil filter clogging - Clean or install new filter.
Hydraulic fluid contamination - The fluid must be changed.
Cylinder tube or rod scoring - Replace defective component.

Hydraulic pump is excessively noisy
Hydraulic leakage or lack of oil - Add hydraulic oil or correct system leaks.
Plugged hydraulic filter - Clean or change the filter.
Suction line clogging - Need to service the suction line.
Air in hydraulic pump - Bleed air from hydraulics.
Pump components are faulty - Rebuild or install new pump.

Electrical Troubleshooting

Battery cannot be charged
Electrical wire connections are loose or corroded - Tighten or service cable connections.
Faulty battery terminal connectors - Replace terminal connectors.
Battery faulty cell - Install a new battery.
Loose or worn belt - Install a new belt or adjust belt tension.

Starter turns slowly
Low battery output voltage - Charge the battery.
Battery runs out quickly - Service charging system or replace battery.
Disconnected wires or corroded battery terminals - Check cable connections and change or clean terminals.

Starter doesn't crank
Battery is discharged or defective - Need to charge or replace the battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery output voltage - Low battery charging, charge as required.
Defective starter motor - Starter should be changed.