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| Home / Compact Track Loaders / Bobcat Compact Track Loaders / Bobcat MT85 |
Bobcat MT85 Troubleshooting
The
Bobcat MT85 mini track loader is powered by 54.8 cu.in (0.9L) Kubota
D902-E4B-BC-1 vertical inline three-cylinder liquid-cooled diesel engine with a
rated power of 24 hp (17.8 kW). The Bobcat MT85 is equipped with a single-speed
hydrostatic transmission, tilt steering, independent hydrostatic brakes, 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 1230 lbs (558 kg)
and tipping load of 2460 lbs (1116 kg). The lift height is 80.9" (2055 mm) to
hinge pin, and dump height is 48.7" (1235 mm).
| Engine Troubleshooting |
Engine hard to start or won't start
Air in fuel system - Bleed fuel system.
Dirty fuel filter - Change filter element.
Faulty or dirty injection nozzles - Inspect nozzles and replace if necessary.
Water in the fuel system - Change fuel and repair fuel system.
Valve clearance is wrong - Adjust valve clearance according to specifications.
Faulty fuel injection pump - Replacement or repair required.
Diesel starts and stops
Plugged air cleaner - Service or replace air cleaner.
Fuel filter plugged - Change filter element.
Poor fuel injection pump tightness - Look for any leaks of fuel pump, tighten it fast.
Fuel injectors are dirty or defective - Test and replace fuel injectors if necessary.
Fuel injection pump failure - Replace or rebuild injection pump.
Diesel shuts off while driving
Low coolant temperature - Warm up the engine as required.
Fuel filter element is clogged - Clean the filter or install new filter element.
There is air in the fuel system - Bleed the system.
Clogged injection nozzle - Change fuel injection nozzles.
Improper fuel injection timing - Set it up as required.
Engine stalls while idle
Incorrect low idle speed adjustment - Correct the settings.
Fuel injection pump is damaged - Repair or install new pump.
Defective fuel injectors - Clean or replace fuel injectors.
Incorrect valve clearance - Check and adjust.
Diesel engine is losing power
Clogged air cleaner - Clean or change cleaner.
Fuel injection nozzles fault - Service or change injection nozzles.
Improper fuel injection pressure - Adjust to correct pressure.
Valve clearance is out of adjustment - Correct valve clearance.
Improperly adjusted low idle speed - Adjust the low idle speed.
Dirty fuel hoses or lines - Clean fuel system lines and hoses.
Cylinder head gasket is defective - Install new cylinder head gasket.
Piston rings are defective or leaking - Piston rings replacement required.
Engine overheats
Insufficient coolant fluid - Add coolant fluid to cooling system and also check it for leaks.
Not enough engine oil - Fill up the engine oil.
Clogged radiator core or damaged radiator cap - Clean radiator or change cap.
Damaged or worn fan belt - Change the fan belt.
Engine overload - Load reducing required.
Oil pressure is low
Low oil level - Fill crankcase to proper oil level.
Engine oil filter is plugged - Change or service engine oil filter.
Improper type of engine oil - Use proper viscosity oil.
Excessive crankshaft bearing oil clearance - Replace bearings.
Oil pump is damaged - Repair or change.
Engine noise or knocking
Engine oil insufficient - Fill up the engine oil.
Engine is not preheated - Warm up engine as required.
Wrong setting of fuel injection pump timing - Set the fuel pump timing correctly.
Low idle speed adjustment is incorrect - Correct low idle settings.
Fuel injector fault - Clean fuel injectors or change it.
Connecting rod is misaligned or worn - Need to change or align the connecting rod.
Pistons are worn or broken - Pistons need to be replaced.
| Drive System Troubleshooting |
Drive system will not operate in either direction
Insufficient hydraulic oil - Check and refill the hydraulic oil.
Blocked or defective track mechanism - Correct blockage or repair tracks.
Worn input drive shaft - Drive shaft need to be replaced or repair.
Faulty relief valve - Change or repair relief valve.
Dirty hydraulic filter or suction line - Clean suction line or replace hydraulic filter.
Hand or foot controls malfunction - Change or repair.
Drive motor or pump is defective - Change or repair faulty component.
Machine will not move straight or moves jerkily
Undercarriage tracks are jammed or defective - Fix jamming or repair tracks.
Faulty or loose tracks - Replace tracks or adjust track tension.
Foreign objects, debris, or dirt jammed in track frame - Clean track frame, remove debris and foreign objects.
Power is too low
Clogged hydraulic oil filter - Change hydraulic filter.
Open or damaged relief valve - Close or change relief valve.
Transmission parts are faulty or damaged - Check and replace defective components.
Input drive shaft is defective - Change or repair faulty drive shaft.
Air in hydraulic system - Bleed air from hydraulic system.
Drive system overheats
Low hydraulic oil level - Checking hydraulic oil level and add if necessary.
Clogged hydraulic fluid filter - Check, clean, or change as necessary.
Relief valve failure - Repair or change.
Hydraulic motor or drive pump is defective - Repair or replace faulty component.
Hydraulic oil cooler is plugged - Clean cooling fins as required.
Drive system overload - Load needs to be reduced.
Drive system makes excessive noise
Oil viscosity is incorrect - Use correct oil viscosity.
Air trapped in hydraulic system - Need to bleed air.
Hydraulic motor or drive pump is defective - Change or repair faulty component.
Mechanical components of drive system are worn or damaged - Inspect drive system and replace faulty parts.
| Hydraulics Troubleshooting |
Hydraulic system overheats
Hydraulic pressure is not correct - Adjust pressure as required.
Main relief valve is damaged or adjusted improperly - Adjust relief valve or change if required.
Hydraulic oil is dirty - The oil must be changed.
Lack of hydraulic oil - Add oil to the hydraulic system.
Worn hydraulic oil pump - Change or repair hydraulic pump if required.
Lift arm can't drop or lift
Faulty lift controls - Check and repair as required.
Defective hydraulic pump - Install new pump or repair it.
Damaged hydraulic control valve - Repair or change hydraulic valve.
Hydraulic cylinder is faulty - Install a new boom cylinder or repair it.
Insufficient hydraulic fluid - Add fluid as required.
Bucket won't move
Bucket tilt controls are damaged - Replace or repair.
Hydraulic pump not working - Install new pump or repair it.
Damaged hydraulic control valve - Change or repair hydraulic valve.
Broken bucket cylinder - Repair or change cylinder.
Low hydraulic oil level - Need to add oil.
Boom or bucket is working slowly
Hydraulic pump is worn - Check pump performance and change it if necessary.
Hydraulic cylinder leaking - Install new cylinder seals.
Hydraulic oil is insufficient - Fill the system to proper hydraulic oil level.
Worn or unadjusted hydraulic control valve - Set correctly or repair.
Hydraulic pressure has dropped - Set pressure correctly.
Jerky operation of the bucket or boom
Air in the hydraulic system - Bleed air from hydraulic system.
Clogged hydraulic oil filter element - Service or change the hydraulic filter.
Hydraulic oil contamination - Change hydraulic oil.
Cylinder rod or tube is scuffed - Replace defective component.
Hydraulic pump makes excessive noise
Not enough oil or hydraulic system leaking - Correct hydraulic leaks or top up oil as needed.
Dirty hydraulic filter - Service or change hydraulic filter.
Dirty suction line - Clean suction line as required.
Air enters the pump - Bleed air from hydraulics.
Pump components are faulty - Replace or rebuild the pump.
| Electrical Troubleshooting |
Battery won’t charge
Wiring connections are corroded or loose - Tighten or service connections.
Battery terminal clamps are defective - Terminal clamps should be changed.
Battery is defective - Replace the battery.
Worn or loose belt - Adjust belt tension or change the belt.
Starter turning slow
Low battery voltage - Recharge the battery.
Battery discharges quickly - Service or replace the battery.
Disconnected wiring or bad battery terminals - Connect wiring properly or install new terminals.
Starter motor won't turn
Battery is drained or worn - Recharge or change battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery power - Low battery charging, charge as required.
Starter motor is defective - Starter needs to be replaced.
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| COMPACT TRACK LOADERS SPECIFICATIONS |