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Bobcat MT52 Troubleshooting
The
Bobcat MT52 mini track loader driveline system components: 43.9 cu.in (0.7L)
Kubota D722-E3B-BC-6 vertical 3-cylinder liquid-cooled diesel engine with a
rated power of 19 hp (14 kW), and fully hydrostatic transmission. The hydraulic
system has a pump with a rated flow of 12 gpm (45.4 lpm). The system pressure is
2900 psi (200 bar). The Bobcat MT52 is equipped with a tilt steering, 7" (180
mm) rubber tracks, and independent hydrostatic brakes. The loader has a bucket
breakout force of 2795 lbs (1270 kg) and maximum lift height of 71.3" (1810 mm)
to hinge pin. The rated operating capacity is 800 lbs (363 kg), and tipping load
is 1600 lbs (726 kg).
| Engine Troubleshooting |
Engine starts up hard or won't start
Air in fuel tank - Bleed fuel tank.
Dirty fuel filter - Clean or change the filter.
Fuel injection nozzles are faulty or clogged - Check and replace nozzles if required.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Improper valve clearance - Check and adjust.
Defective fuel injection pump - Rebuild or change fuel pump.
Diesel starts and stops
Air cleaner is clogged - Clean or change.
Clogged fuel filter - Clean or replace the filter.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Fuel injectors are faulty or clogged - Replace or clean fuel injectors.
Fuel injection pump malfunctioning - Install a new fuel pump or repair.
Engine shuts off suddenly while running
Low coolant temperature - Warm up engine as required.
Clogged fuel filter - Clean or change the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Clogged injection nozzle - Replace injection nozzles.
Improper setting of fuel injection pump timing - Set the fuel pump timing correctly.
Engine stalls while idling
Incorrectly adjusted low idle speed - Adjust low idling as recommended.
Fuel injection pump is faulty - Replacement or repair required.
Defective fuel injectors - Change or clean fuel injectors.
Improper valve clearance - Adjustment procedure required.
Engine power loss
Air filter is clogged - Clean or change filter.
Clogged injection nozzle - Clean or change injection nozzles.
Fuel injection pressure is wrong - Adjust pressure to proper level.
Excessive valve clearance - Correct valve clearance.
Low idle speed adjustment is incorrect - Correct the settings.
Clogged fuel lines or hoses - Clean fuel system lines and hoses.
Cylinder-head gasket is broken - Replace cylinder head gasket.
Damaged or leaking piston rings - Piston rings need to be replaced.
Engine overheating
Low coolant level - The cooling system needs to be refilled and checked for faults.
Engine oil insufficient - Need to add engine oil.
Faulty radiator cap or dirty radiator fins - Clean radiator or install new cap.
Fan belt is loose or defective - Belt replacement is recommended.
Engine is overloaded - Reduce engine load.
Oil pressure is low
Low crankcase oil level - Fill crankcase to proper oil level.
Dirty oil filter - Replace or service engine oil filter.
Improper type of engine oil - Drain and refill with oil of correct grade and viscosity.
Crankshaft bearing oil clearance is incorrect - Bearing replacement required.
Oil pump malfunction - Repair or replace.
Engine knocking sound or abnormal noise
Engine oil level low - Fill up the oil to required level.
Coolant temperature is low - Warm up engine as required.
Improper setting of fuel injection pump timing - Adjust fuel injection pump as required.
Low idle speed setting is incorrect - Adjust low idling as recommended.
Fuel injectors are faulty or clogged - Inspect fuel injectors and change as required.
Connecting rod is not aligned or defective - Align or change connecting rod.
Worn or broken pistons - Have pistons replaced.
| Drive System Troubleshooting |
Drive system will not operate in either direction
Insufficient hydraulic oil - Need to add oil.
Track mechanism is defective or jammed - Repair or fix jamming.
Damaged input drive shaft - Drive shaft need to be replaced or repair.
Relief valve is broken - Service or change relief valve.
Plugged suction line or hydraulic filter - Change hydraulic filter or service suction line.
Foot or hand controls are damaged - Check and repair as required.
Drive motor or pump failure - Inspect and change as required.
Machine is not moving straight or moving is jerky
Track mechanism is defective or jammed - Repair or remove jamming.
Tracks are loose or worn - Adjust track tension properly or repair tracks.
Track frame is blocked with debris, dirt, or foreign objects - Remove foreign objects or debris and clean undercarriage track frame.
Low power
Hydraulic oil filter is plugged - Replace or clean hydraulic filter.
Relief valve is worn or opened - Change or close relief valve.
Worn or faulty transmission components - Check and change defective components.
Damaged input drive shaft - Faulty drive shaft need to be replaced or repair.
Air in the hydraulic system - Air bleeding is required.
Drive system overheating
Low hydraulic oil level - Need to add oil.
Dirty hydraulic fluid filter - Check, clean, or change as necessary.
Relief valve defective or worn - Change or repair relief valve.
Worn hydraulic motor or drive pump - Inspect and change as required.
Oil cooler is clogged - Clean the cooling fins.
Drive system overloaded continuously - Load should be reduced.
Excessive noise
Oil viscosity is incorrect - Drain and refill with proper oil.
Air trapped in hydraulic system - Need to bleed air.
Hydraulic motor or drive pump failure - Inspect and replace as necessary.
Mechanical parts of drive system are damaged or worn - Inspect the parts for worn or defect and repair as needed.
| Hydraulics Troubleshooting |
Hydraulic system overheats
Hydraulic pressure is not adjusted correctly - Adjust pressure correctly.
Main relief valve is defective or unadjusted - Set up or change the relief valve.
Hydraulic oil contamination - The oil must be changed.
Hydraulic oil level is low - Check oil level and add hydraulic oil as required.
Hydraulic pump is defective - Repair or replace pump if necessary.
Boom cannot be lowered or raised
Lift controls malfunction - Repair or change.
Hydraulic pump failure - Change or repair hydraulic pump if required.
Hydraulic control valve is faulty - Repair or replace hydraulic valve.
Damaged hydraulic cylinder - Repair or install a new lift cylinder.
Low hydraulic oil level - Need to add oil.
Bucket does not function
Damaged bucket controls - Change or repair.
Hydraulic pump is broken - Change or repair hydraulic pump if required.
Defective hydraulic control valve - Repair or replace hydraulic valve.
Broken bucket cylinder - Repair or install a new cylinder.
Hydraulic oil level low - Check and refill the hydraulic oil.
Boom or bucket functions slowly
Hydraulic pump is defective - Check pump capacity and change if necessary.
Leaking hydraulic cylinder - Change cylinder piston seals.
Low hydraulic oil level - Check and refill the hydraulic oil.
Faulty or incorrect setting hydraulic control valve - Set correctly or repair.
Hydraulic pressure loss - Set pressure correctly.
Bucket or boom is jerky
Air in the hydraulic system - Bleed air from system.
Hydraulic oil filter is dirty - Service or change the hydraulic filter.
Hydraulic oil contamination - Change hydraulic oil.
Cylinder tube or rod is scored - Replace failed component.
Hydraulic pump makes excessive noise
Not enough oil or hydraulic system leaking - Refill hydraulic oil or repair leaks in system.
Dirty hydraulic filter - Replace or clean the filter.
Plugged suction line - Service the suction line.
Pump sucks air - Need to bleed air.
Pump parts are worn out - Replace or rebuild the pump.
| Electrical Troubleshooting |
Battery is not charging
Electrical wire connections are loose or corroded - Service or tighten connections.
Battery terminal clamps are defective - Terminal clamps should be changed.
Battery is worn - Battery change required.
Loose or damaged belt - Adjust belt tension or change the belt.
Starter cranks slowly
Low battery voltage - Battery is drained, recharge it.
Battery runs out quickly - Service charging system or replace battery.
Disconnected battery cables or bad terminals - Connect wiring correctly or install new terminals.
Starter will not crank
Battery is discharged or defective - Need to charge or replace the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery voltage is low - Recharge the battery.
Faulty starter motor - Repair or install a new starter.
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| COMPACT TRACK LOADERS SPECIFICATIONS |