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| Home / Compact Track Loaders / Bobcat Compact Track Loaders / Bobcat MT55 |
Bobcat MT55 Troubleshooting
The
Bobcat MT55 mini track loader is powered by Kubota D902-E3B-BC-1 vertical
in-line 3-cylinder liquid-cooled diesel engine with a rated power of 24 hp (17.8
kW). The Bobcat MT55 is equipped with a single-speed hydrostatic transmission,
independent hydrostatic brakes, tilt steering, and 7.1" (180 mm) or 9.8" (250
mm) rubber tracks. The hydraulic system has a pump with fluid flow rate of 12
gpm (45.4 lpm). The hydraulic pressure is 2900 psi (200 bar). The track loader
has a rated operating capacity of 805 lbs (366 kg) and tipping load of 1610 lbs
(732 kg). The maximum lift height is 71.3" (1810 mm) to hinge pin, and bucket
breakout force is 2920 lbs (1330 kg).
| Engine Troubleshooting |
Engine starts up hard or won't start
Air in fuel system - Bleed fuel system.
Fuel filter element clogging - Change filter element.
Dirty or damaged injection nozzles - Service or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Incorrect valve clearance - Adjust to proper valve clearance.
Fuel injection pump failure - Rebuild or install a new injection pump.
Diesel starts but stalls immediately
Air cleaner is clogged - Clean or change.
Fuel filter plugged - Install new filter element.
Problems with fuel injection pump tightness - Inspect fuel injection pump for leaks.
Clogged or defective injectors - Clean or replace fuel injectors.
Fuel injection pump damage - Change or repair the pump.
Engine stops unexpectedly during operation
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Fuel filter element clogging - Service or replace the filter.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles fault - Service or change injection nozzles.
Fuel injection pump timing is not adjusted - Adjust fuel injection pump as required.
Engine stalls at low idle speed
Low idle speed setting is incorrect - Adjustment required.
Fuel injection pump failure - Repair or install a new fuel pump.
Fuel injector fault - Replace fuel injectors.
Valve clearance is out of adjustment - Adjustment procedure required.
Diesel engine loses power
Air cleaner is dirty - Service or replace air cleaner.
Clogged injection nozzle - Service or change injection nozzles.
Insufficient fuel injection pressure - Test fuel injection pressure and adjust it correctly.
Incorrect valve clearance - Check and adjust.
Incorrect low idle speed adjustment - Normalize low idle speed.
Dirt in the fuel lines or hoses - Clean fuel hoses and lines.
Leaking cylinder head gasket - Change cylinder head gasket.
Piston rings are damaged or leaking - Change piston rings.
Engine is overheated
Coolant level is low - Top up coolant fluid and check system for leaks.
Lack of engine oil - Fill the crankcase with engine oil.
Damaged radiator cap or dirty radiator core - Change cap or clean radiator.
Fan belt slipping or worn - Replace as required.
Diesel engine overloaded - Load reducing is recommended.
Insufficient oil pressure
Lack of oil - Fill the crankcase with oil.
Oil filter is clogged - Change or service engine oil filter.
Oil grade or viscosity is incorrect - Use oil of correct viscosity.
Incorrect crankshaft bearing oil clearance - Replace bearings.
Oil pump is worn or damaged - Install a new pump.
Abnormal engine noise or knocking
Insufficient engine oil - Check oil level and add oil as required.
Coolant temperature is low - Engine is not warmed up to the required temperature.
Improper setting of fuel injection pump timing - Adjust the pump as required.
Too low idle RPM - Test and adjust.
Clogged or defective injectors - Replace or clean fuel injectors.
Misaligned or faulty connecting rod - Need to replace or align the connecting rod.
Pistons are worn or scored - Install new pistons.
| Drive System Troubleshooting |
Machine does not move forward or backward
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.
Track mechanism is jammed or defective - Fix jamming or repair tracks.
Input drive shaft malfunctioning - Service or change drive shaft.
Relief valve is damaged - Rebuild or install a new relief valve.
Hydraulic filter or suction line is dirty - Check, clean, or replace if required.
Faulty foot or hand controls - Repair or change.
Worn drive motor or pump - Replace or repair faulty component.
Machine will not drive straight or drives jerky
Damaged or jammed track mechanism - Repair or remove jamming.
Tracks are sagging or faulty - Repair tracks or correct track sag with tension.
Undercarriage track frame is clogged with dirt, debris, or foreign objects - Clean undercarriage track frame, remove foreign objects and debris.
Lack of power
Hydraulic oil filter is plugged - Change hydraulic filter.
Opened or worn relief valve - Replace or close relief valve.
Faulty or worn transmission components - Inspect and replace defective parts.
Input drive shaft failure - Change or repair faulty drive shaft.
Air leaks in hydraulic system - Bleed hydraulic system.
Drive system overheating
Hydraulic fluid level low - Check and refill the hydraulic fluid.
Hydraulic fluid filter is dirty - Change hydraulic filter.
Relief valve is broken - Repair or change.
Drive pump or hydraulic motor malfunction - Inspect and change as required.
Dirty oil cooler - Clean cooling fins as required.
Transmission overloading - Reduce loading.
Drive system is excessively noisy
Incorrect oil viscosity - Use the specified type of oil.
Air in the hydraulic system - Bleed air from hydraulic system.
Hydraulic motor or drive pump failure - Inspect and change as required.
Worn or damaged mechanical parts of drive system - Inspect the components for defect or damage and repair as needed.
| Hydraulics Troubleshooting |
Hydraulic system has overheating
Hydraulic pressure incorrectly adjusted - Adjust pressure correctly.
Unadjusted or defective main relief valve - Adjust or change relief valve.
Hydraulic fluid is contaminated - Change hydraulic fluid.
Not enough hydraulic oil in the system - Add oil to the hydraulic system.
Worn hydraulic oil pump - Repair or install new hydraulic pump.
Boom does not raise or lower
Lift controls failure - Repair or change.
Hydraulic pump is broken - Change or repair hydraulic pump if required.
Faulty hydraulic control valve - Replace or repair the valve.
Hydraulic cylinder is faulty - Change or repair lift cylinder.
Hydraulic fluid is insufficient - Add fluid as required.
Bucket is not working
Damaged bucket controls - Inspect and repair if necessary.
Hydraulic pump not working - Repair or replace pump if necessary.
Hydraulic control valve failure - Repair or change the valve.
Bucket cylinder is faulty - Repair or install a new cylinder.
Insufficient hydraulic fluid - Add fluid as required.
Bucket or lift arm runs slowly
Hydraulic pump is worn - Test pump flow rate and replace pump if required.
Leaking hydraulic cylinder - Replace cylinder piston seals.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.
Worn or unadjusted hydraulic control valve - Repair or adjust properly.
Hydraulic system loosing pressure - Set pressure correctly.
Bucket or boom movements are jerky
There is air in the hydraulic system - Bleed hydraulic system.
Hydraulic oil filter is dirty - Change or clean oil filter.
Hydraulic oil is dirty - The oil must be changed.
Cylinder tube or rod is scored - Change defective component.
Hydraulic pump is noisy
Hydraulic leaks or lack of oil - Remedy hydraulic leakage or refill oil as necessary.
Hydraulic filter is dirty - Change or clean oil filter.
Plugged suction line - Suction line needs to be cleaned.
Air in hydraulic pump - Need to bleed air.
Damaged pump components - Rebuild or change hydraulic pump.
| Electrical Troubleshooting |
Battery cannot be charged
Corroded or loose wire connections - Service or tighten cable connections.
Battery terminal clamps are faulty - Terminal clamps need to be replaced.
Battery failing - Replace the battery.
Loose or defective belt - Change belt or adjust belt tension.
Starter motor cranks slow
Battery capacity is low - Low battery charging, charge as required.
Battery runs out quickly - Service battery or replace it.
Bad terminals or disconnected battery cables - Check cable connections and change or clean terminals.
Starter is not cranking
Battery is discharged or worn - Recharge or replace battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery power - Recharge the battery.
Starter motor is defective - Change or repair starter.
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| COMPACT TRACK LOADERS SPECIFICATIONS |