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| Home / Farm Tractors / Case IH Tractors / Case IH MX120 |
Case IH MX-120 Troubleshooting
The
Case IH MX120 farm tractor was manufactured between 1997 and 2002. The Case IH
MX 120 tractor is powered by 359 cu.in (5.9 L) Cummins B6T-590 six-cylinder
turbocharged diesel engine with a rated power of 120 hp (89.5 kW).
The Case IH MX120 Maxxum is fitted with a 2 types of transmission. Type 1: 16x12 synchromesh transmission. Type 2: 20x12 (32x24 with creeper) partial powershift transmission. The maximum travel speed (forward/reverse): 23 mph (37 kph) and 13.7 mph (22.2 kph). The closed center pressure flow compensated hydraulic system has a pump with a rated capacity of 25 gpm (94.6 lpm).
The hydraulic system pressure is 203 bar (2950 psi). The 2WD models are equipped with 11.00x16 front tires and 18.4-R38 rear tires. The 480/70R26 front tires and 520/70R38 rear tires are used for 4WD tractors. The tractor is compatible with a Case IH L300 front loader with lift capacity to maximum height of 3850 lbs (1746 kg) and breakout force of 4900 lbs (2222 kg).
| Diesel Engine Troubleshooting |
| Engine difficult to start or doesn't start |
Air trapped in fuel system - Bleed air.
Fuel filter element clogging - Change filter element.
Fuel injection nozzles are dirty or defective - Change fuel injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is wrong - Correct valve clearance.
Fuel injection pump failure - Rebuild or replace pump.
| Engine starts and then shuts off |
Plugged air filter - Change air filter element.
Fuel filter plugged - Clean or replace the filter.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Fuel injectors are dirty or defective - Clean fuel injectors or change it.
Fuel injection pump is not working correctly - Install a new fuel pump or repair.
| Engine shuts off suddenly while running |
Coolant temperature is low - Warm up engine as required.
Fuel filter plugging - Change the filter element.
Air trapped in fuel system - Bleed air.
Defective or clogged injection nozzle - Check and replace nozzles if required.
Incorrect adjustment of fuel injection pump timing - Adjust fuel injection pump as required.
| Engine shuts off while idling |
Incorrectly adjusted low idle speed - Correct the settings.
Fuel injection pump is not operating properly - Repair or install a new fuel pump.
Fuel injector fault - Change or clean fuel injectors.
The valve clearance is not adjusted - Adjustment procedure required.
| Loss of engine power |
Restricted intake air - Clean or replace element.
Faulty fuel injection nozzles - Clean or change injection nozzles.
Fuel injection pressure is wrong - Adjust pressure to proper level.
Excessive valve clearance - Need to adjust valve clearance.
Wrong adjustment of low idle speed - Adjust low idle speed.
Fuel lines or hoses clogging - Clean fuel system hoses and lines.
Cylinder-head gasket is broken - Gasket should be replaced.
Damaged or leaking piston rings - Change piston rings.
| Engine overheated |
Insufficient coolant fluid - Refill to the correct level and inspect system for leaks.
Not enough engine oil - Checking oil level and add if necessary.
Dirty radiator core or faulty radiator cap - Install new cap or clean radiator.
Broken or loose fan belt - Change as required.
Engine overload - Reduce load or shift to lower gear.
| Oil pressure is low |
Insufficient engine oil - Need to add oil.
Oil filter element is dirty - Service or replace engine oil filter.
Incorrect oil viscosity - Fill up with the correct oil viscosity.
Incorrect oil clearance in crankshaft bearing - Bearing replacement required.
Worn oil pump - Check and replace if necessary.
| Engine noises or knocks |
Insufficient engine oil - Checking oil level and add if necessary.
Low coolant temperature - Normalize the temperature by warming up the engine.
Improper fuel injection timing - Set up as recommended.
Incorrectly adjusted low idle speed - Adjust low idling as recommended.
Fuel injector fault - Test and replace fuel injectors if necessary.
Connecting rod is worn or misaligned - Align or replace connecting rod.
Pistons are worn or scored - Install new pistons.
| Transmission Troubleshooting |
| Low transmission oil pressure |
Insufficient transmission fluid - Add fluid to the transmission housing.
Transmission fluid filter element is clogged (if equipped) - Service or replace the transmission fluid filter.
Relief valve failure - Replace valve as required.
| Excessive transmission noise |
Insufficient transmission oil - Fill up the transmission oil.
Transmission fluid is dirty - Transmission fluid change required.
Gears are defective or backlash is improper - Install new gears and adjust backlash properly.
Bearings are cracked or worn - Bearings need to be replaced.
Damaged or worn gear shift forks - Shift forks need to be changed.
Worn or damaged shaft splines - Change the shaft.
| Hard shifts |
Rusty or worn gear shift linkage - Install a new gear shift linkage.
Worn or bent gear shift forks - Shift forks need to be replaced.
Gear shifting mechanism is defective - Defective parts must be replaced.
Clutch is out of adjustment or defective - Clutch replacement or adjustment required.
| Transmission fluid leaks |
High transmission fluid level - Drain the excess fluid.
Seals or gaskets are worn - Change defective gaskets or seal.
| Hydraulic System Troubleshooting |
| Low hydraulic oil pressure |
Low hydraulic oil level - Need to add oil.
Hydraulic oil filter is clogged - Hydraulic filter maintenance required.
Hydraulic pump not working - Repair or replace hydraulic fluid pump.
Incorrect setting hydraulic spool valve - Use the correct setting.
Hydraulic cylinder is broken - Replace or repair hydraulic cylinder.
Leaking hydraulic pipes - Identify leaks in the system and repair it.
| Hydraulic system is too hot |
Main relief valve failure - Change relief valve.
Hydraulic oil type is improper - Fill up with the proper type of oil.
Hydraulic fluid is dirty - Hydraulic fluid change required.
Air in the hydraulic system - Air bleeding.
| Hitch won't raise or raises slowly |
Excessive loading on the hitch - Reduce the load is required.
Low hydraulic fluid level - Add fluid as required.
Clogged hydraulic fluid filter element - Hydraulic filter maintenance required.
Hydraulic pump failure - Repair or replace hydraulic fluid pump.
Defective main relief valve - Relief valve must be changed.
Faulty hydraulic control valve - Repair or change hydraulic valve.
Hydraulic cylinder is defective - Repair or change hydraulic cylinder.
Suction line is loose or broken - Replace or repair.
| Hitch won't drop or drops slowly |
Hydraulic control valve block is out of adjustment - Control valve needs to be adjusted.
Hydraulic cylinder malfunction - Change or repair hydraulic cylinder.
Hitch is out of adjustment - Adjust as required.
Hitch rock shaft is damaged - Change the shaft.
| Hitch drop or lift is jerky |
There is air in the hydraulic system - Bleed hydraulic system.
Dirty hydraulic fluid - The fluid must be changed.
Damaged hydraulic pump - Replace or repair hydraulic oil pump.
Hydraulic control valve block is damaged - Repair or change hydraulic valve.
Broken hydraulic cylinder - Repair or replace hydraulic cylinder.
| Steering System Troubleshooting |
| Steering is difficult |
Incorrectly fitted or worn steering column - Refit or replace the steering column.
Air in the hydraulic steering system - Need to bleed air.
Improper toe-in - Check and adjust toe-in.
Uneven tire pressure - Inflate the tires properly.
Steering pump is faulty - Check the hydraulic steering pump and change if necessary.
Worn or stuck pump flow control valve - Service or replace flow control valve.
Lack of steering oil - Fill the steering system with oil.
| Excessive steering wheel free play |
Steering column shaft or coupling is worn out - Change faulty part.
Steering pump malfunction - Check the hydraulic steering pump and change if necessary.
Loose or worn steering linkage parts - Replace or repair steering linkage.
| Front wheels wander to right or left |
Tires have uneven wear - Replace the tires.
Improper toe-in - Adjust toe-in wheels.
Steering linkage components are loose or worn - Change or repair steering linkage.
Front wheel bearings are damaged or incorrectly adjusted - Adjust properly or replace bearings.
| Electrical System Troubleshooting |
| Battery is not charging |
Electrical wire connections are loose or corroded - Clean or tighten wiring connections.
Defective electrical terminal connectors - Change terminal connectors.
Battery dead cell - Battery replacement required.
Loose or defective belt - Belt needs to be adjusted or changed.
| Starter motor turns slow |
Battery power is low - Recharge the battery.
Battery drains quickly - Service charging system or install new battery.
Terminals are faulty or battery cables are disconnected - Connect wiring properly or install new terminals.
| Starter motor is not working |
Battery is drained or defective - Battery needs to be recharged or replaced.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery power - Battery is drained, charge it.
Defective starter motor - Replace or repair starter.
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| Farm Tractors Technical Specifications |