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Case IH JX-90 Troubleshooting

The Case IH JX90 utility tractor was manufactured between 2007 and 2008. The tractor is powered by 274 cu.in (4.5 L) CNH NEF 4-cylinder direct injection turbocharged intercooled diesel engine with a rated power of 87.2 hp (62 kW).

The Case IH JX-90 is fitted with a 2 types of transmission. Type 1: Mechanical shuttle transmission with 12 forward and 12 reverse gears. Type 2: Creeper transmission with 20 forward and 12 reverse gears. The maximum travel speed (forward/reverse): 24.4 mph (39 kph) and 17.6 mph (28.3 kph).

The open center hydraulic system has a gear pump with a rated capacity of 10.6 gpm (40.1 lpm) or 13.6 gpm (51.5 lpm). The hydraulic system pressure is 190 bar (2755 psi). The Case IH JX90 tractor is equipped with a hydrostatic power steering system, hydraulic wet disc brakes, 13.6R24 front tyres, and 16.9R34 rear tyres. The wheelbase is 91" (2310 mm) for 2WD models and 87" (2200 mm) for 4WD models.

Engine Troubleshooting
Engine hard to start or won't start

Air in the fuel pipes - Bleed the fuel pipes.
Fuel filter plugged - Change filter element.
Fuel injection nozzles are clogged or faulty - Service or change injection nozzles.
Dirt or water in fuel system - Drain water or flush dirt from the system.
Valve clearance is not correct - Have it adjusted.
Fuel injection pump is faulty - Rebuild or change fuel pump.

Diesel starts and stops

Air filter clogged - Clean air cleaner element.
Fuel filter plugged - Install new filter element.
Fuel injection pump is leaking - Repair any leaks.
Damaged or clogged injectors - Change or clean fuel injectors.
Fuel injection pump malfunctioning - Replacement or repair required.

Engine stalls after running

Engine is not fully warmed up - Warm up the engine.
Fuel filter element is dirty - Change filter element.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles fault - Inspect nozzles and replace if necessary.
Improper fuel injection timing - Set it up as required.

Engine stalls while idle

Low idle speed setting is incorrect - Adjust as required.
Damaged fuel injection pump - Rebuild or replace pump.
Fuel injector fault - Clean fuel injectors or change it.
Incorrect valve clearance - Adjust valve clearance.

Poor engine power

Air filter plugged - Air filter maintenance required.
Fuel injection nozzles are clogged or faulty - If necessary, replace with a new nozzle.
Fuel injection pressure is wrong - Adjust to correct pressure.
Valve out of adjustment - Adjust to proper valve clearance.
Low idle speed setting is not correct - Correct low idle settings.
Dirty fuel lines or hoses - Clean fuel hoses and lines.
Defective cylinder head gasket - Replace the gasket as required.
Defective or worn piston rings - Piston rings replacement required.

Engine is overheated

Insufficient coolant fluid - Add coolant and check the components of cooling system.
Engine oil level is low - Check and refill engine oil.
Dirty radiator core or faulty radiator cap - Clean radiator or install new cap.
Loose or defective fan belt - Change the fan belt.
Diesel engine is overloaded - Reduce load or shift to lower gear.

Insufficient oil pressure

Oil level is insufficient - Add oil to the engine crankcase.
Plugged engine oil filter - Clean or replace engine oil filter element.
Improper type of engine oil - Use proper viscosity oil.
Excessive main bearing oil clearance - Install new bearings.
Defective oil pump - Inspect and change as required.

Engine knocking or noise

Engine oil level low - Check and refill engine oil.
Coolant temperature is low - Normalize the temperature by warming up the engine.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Wrong adjustment of low idle speed - Test and adjust.
Defective fuel injectors - Clean or replace fuel injectors.
Connecting rod is defective or misaligned - Alignment procedure or replacement is required.
Pistons are broken or worn - Replace the pistons.

Transmission Troubleshooting
Low transmission fluid pressure

Insufficient transmission fluid - Fill the transmission housing to proper fluid level.
Transmission fluid filter element clogging (if equipped) - Service or replace the transmission fluid filter.
Relief valve malfunction - Replace valve as required.

Excessive transmission noise

Lack of transmission fluid - Fill the transmission housing to proper fluid level.
Transmission oil is contaminated - Fill up with fresh transmission oil.
Gears are defective or backlash is improper - Install new gears and adjust backlash properly.
Worn or damaged bearings - Faulty bearings should be changed.
Shift forks are bent or worn out - Change defective shift forks.
Shaft splines are worn or stuck - Shaft need to be replaced.

Difficult to shift gears

Gear shift linkage is worn or rusty - Change or lubricate shift linkage.
Worn or damaged gear shift forks - Change the shift forks.
Gearshift mechanism malfunction - Identify and replace failed parts.
Clutch is out of adjustment or defective - Adjust clutch or replace if required.

Transmission fluid leaks

Too much fluid in transmission - Excess fluid must be drained.
Seals or gaskets are worn - Gaskets or seal replacement required.

Hydraulics Troubleshooting
Insufficient hydraulic fluid pressure

Hydraulic fluid is insufficient - Add fluid as required.
Clogged hydraulic fluid filter - Replace filter element or clean if required.
Damaged hydraulic pump - Install a new hydraulic oil pump.
Hydraulic control valve is out of adjustment - Need to make adjustment.
Hydraulic cylinder is faulty - Change or repair hydraulic cylinder.
Leaks in hydraulic pipes - Identify leaks in the system and repair it.

Hydraulic system overheated

Main relief valve malfunction - Change relief valve.
Hydraulic oil type is improper - Fill up with the proper type of oil.
Dirty hydraulic oil - The oil must be changed.
Air trapped in hydraulic system - Bleed air from system.

3-point hitch won't lift or lifts slowly

Excessive loading on the hitch - Load needs to be reduced.
Low hydraulic oil level - Need to add oil.
Clogged hydraulic fluid filter element - Clean or change hydraulic filter.
Hydraulic pump failure - Replace or repair hydraulic fluid pump.
Main relief valve malfunctioning - Replace relief valve.
Hydraulic control valve block is defective - Repair or change hydraulic valve.
Broken hydraulic cylinder - Change or repair hydraulic cylinder.
Suction line is disconnected or broken - Replace or connect correctly.

Hitch fails to drop or drops slowly

Hydraulic control valve block is set improperly - Set properly.
Defective hydraulic cylinder - Repair or change hydraulic cylinder.
Three-point hitch is out of adjustment - Adjustment is required.
Worn lift arm shaft - Install a new shaft.

Jerky lowering or lifting of the hitch

Air in hydraulic system - Bleed air from hydraulic system.
Hydraulic oil contamination - Change the oil.
Hydraulic pump is faulty - Repair or replace hydraulic oil pump.
Hydraulic control valve is defective - Repair or change hydraulic valve.
Faulty hydraulic cylinder - Change or repair hydraulic cylinder.

Steering System Troubleshooting
Steering wheel turns hard

Improperly mounted or worn steering column - Mount the steering column as required or change it.
Air in steering hydraulic system - Bleed the system of air.
Not adjusted toe-in - Adjust toe-in wheels.
Front tires are worn unevenly - Install new tires.
Faulty steering pump - Repair or change steering pump.
Pump flow control valve is damaged or stuck - Clean or install new 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 component.
Steering pump not working - Steering pump needs to be repaired or replaced.
Worn or loose steering linkage joints - Repair or replace steering linkage.

Tractor is pulling to left or right

Uneven wear on front tyres - Replace the tyres.
Not adjusted toe-in - Adjust toe-in wheels.
Worn or loose steering linkage assembly - Repair or change steering linkage.
Improperly adjusted or defective front wheel bearings - Change or adjust bearings correctly.

Electrical Troubleshooting
Battery is not charging

Corroded or loose wire connections - Service or tighten connections.
Electrical terminal connectors are faulty - Terminal connectors should be replaced.
Battery bad cell - Battery change required.
Belt is loose or defective - Adjust belt tension or change the belt.

Starter motor turns slow

Low battery capacity - Charge the battery.
Battery is not holding charge - Service charging system or change battery.
Battery cables are disconnected or terminals are faulty - Check cable connections and replace or service terminals.

Starter motor won't turn

Battery is low or faulty - Charge or change the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output voltage - Low battery charging, charge as required.
Starter motor is damaged - Starter should be replaced.



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