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Case IH 633 Troubleshooting

The Case IH 633 utility tractor was manufactured between 1975 and 1978. The Case IH 633 tractor is powered by 179 cu.in (2.9 L) Case D179 3-cylinder direct injection liquid-cooled diesel engine with a rated power of 52 hp (38.8 kW).

The Case IH 633 is fitted with a 2 types of transmission. Type 1: Synchromesh transmission with 8 forward and 4 reverse gears. Type 2: IH Synchron 2-speed powershift transmission with 16 forward and 8 reverse gears. The maximum travel speed (forward/reverse): 15.3 mph (24.6 kph) and 8.9 mph (14.3 kph).

The open center hydraulic system has a gear pump with a rated capacity of 8.6 gpm (32.6 lpm). The hydraulic system pressure is 172 bar (2500 psi). The tractor is equipped with a mechanical or hydrostatic steering, hydraulic wet disc brakes, 6.50-16 (2WD) or 10.5-20 (4WD) front tyres, and 12.4/11-36 (2WD) or 16.9/14-28 (4WD) rear tyres. The wheelbase is 81.5" (2070 mm) for 2-wheel drive models and 80.2" (2030 mm) for 4-wheel drive models.

Diesel Engine Troubleshooting
Engine difficult to start or doesn't start

Air in the fuel system - Air bleeding.
Fuel filter plugging - Clean the filter or install new filter element.
Dirty or faulty injection nozzles - Clean or replace injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
The valve clearance is not adjusted - Check and adjust.
Fuel injection pump is defective - Repair or change injection pump.

Engine starts but then stops

Dirty air filter - Replace air filter element.
Fuel filter plugged - Filter maintenance required.
Fuel injection pump has loose connections - Tighten the connections.
Defective fuel injectors - Replace or clean fuel injectors.
Fuel injection pump is not working correctly - Replace or rebuild injection pump.

Engine shuts off suddenly during operation

Engine not warmed up - Normalize the temperature by warming up the engine.
Fuel filter element is dirty - Filter maintenance required.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are clogged or faulty - Test injection nozzles and change if necessary.
Fuel injection pump timing is wrong - Set up as recommended.

Engine stops while idling

Low idle speed setting is incorrect - Adjust low idling as recommended.
Damaged fuel injection pump - Replace injection pump or repair it.
Clogged or defective injectors - Replace or clean fuel injectors.
Incorrect valve clearance - Correct valve clearance.

Engine power is insufficient

Clogged air filter - Change air filter element.
Dirty or damaged injection nozzles - Check injection nozzles and replace if required.
Uneven fuel injection pressure - Correct the pressure settings.
The valve clearance is incorrect - Adjust valve clearance.
Low idle speed setting is incorrect - Correct low idle settings.
Dirt in the fuel hoses or lines - Clean fuel hoses and lines.
Cylinder head gasket is defective - Install a new gasket.
Piston rings are leaking or defective - Replace the piston rings as required.

Engine overheated

Insufficient coolant - Add coolant and check the components of cooling system.
Engine oil insufficient - Fill up the engine oil.
Dirty radiator fins or defective radiator cap - Replace cap or clean radiator.
Fan belt slipping or worn - Change the fan belt.
Engine overloaded - Load reducing required.

Low oil pressure

Low oil level - Fill up the engine oil.
Oil filter element clogged - Change or clean engine oil filter element.
Oil grade or viscosity is wrong - Use oil of proper viscosity.
Crankshaft bearing has incorrect oil clearance - Replace bearings.
Oil pump is defective - Remove and inspect oil pump.

Engine noises or knocks

Low engine oil level - Check oil level and add oil as required.
Engine not warmed up - Normalize the temperature by warming up the engine.
Wrong setting of fuel injection pump timing - Adjust according to specifications.
Improperly adjusted low idle speed - Adjust low idling as recommended.
Defective fuel injectors - Test and replace fuel injectors if necessary.
Connecting rod is misaligned or worn - Replace or align connecting rod.
Pistons are broken or worn - Install new pistons.

Transmission Troubleshooting
Insufficient transmission fluid pressure

Transmission oil level is low - Fill up the transmission oil.
Clogged transmission fluid filter (if equipped) - Service or replace the transmission fluid filter.
Relief valve is damaged - Install a new relief valve.

Transmission noises

Transmission oil insufficient - Add oil to the transmission housing.
Transmission oil is contaminated - Change the oil.
Gears are defective or backlash is improper - Replace gears or adjust backlash correctly.
Bearings are cracked or worn - Change the bearings.
Shift forks are worn or bent - Change defective shift forks.
Shaft splines are worn or damaged - Shaft need to be changed.

Difficult to shift gears

Gear shift linkage is rusty or worn - Install a new gear shift linkage.
Shift forks are worn or bent - Replace defective shift forks.
Worn out parts of the gearshift mechanism - Replace worn parts.
Improperly adjusted or worn clutch - Adjust clutch or replace if required.

Transmission fluid leakage

Too much oil in transmission - Drain the excess oil.
Damaged gaskets or seals - Gaskets or seal replacement required.

Hydraulics Troubleshooting
Hydraulic oil pressure too low

Hydraulic oil is insufficient - Check and refill the hydraulic oil.
Clogged hydraulic fluid filter - Service the hydraulic filter or change if required.
Hydraulic pump is faulty - Change or repair hydraulic fluid pump.
Incorrect adjusted hydraulic control valve - Adjust correctly.
Defective hydraulic cylinder - Repair or install a new hydraulic cylinder.
Leaking hydraulic lines - Check the hydraulic system and fix leaks.

Excessive hydraulic system heat

Main relief valve is faulty - Relief valve replacement required.
Wrong hydraulic fluid type - Pour the proper type of fluid.
Hydraulic oil contamination - Change the oil.
Air in hydraulic lines - Bleed hydraulic lines.

3-point hitch won't lift or lifts slowly

Excessive hitch loading - Load needs to be reduced.
Insufficient hydraulic fluid - Add fluid as required.
Clogged hydraulic fluid filter - Change the hydraulic filter element or service if required.
Faulty hydraulic pump - Change or repair hydraulic fluid pump.
Defective main relief valve - Relief valve must be changed.
Faulty hydraulic spool valve - Repair or change the valve.
Hydraulic cylinder is broken - Repair or change hydraulic cylinder.
Suction line is disconnected or broken - Replace or connect correctly.

3-point hitch won't lower or lowers slowly

Hydraulic control valve block is set improperly - Set properly.
Hydraulic cylinder failure - Repair or replace hydraulic cylinder.
The three-point hitch is not adjusted - Need to make adjustments.
Hitch rock shaft is worn Change the shaft.

Hitch lowering or lifting is jerky

Air in the hydraulic system - Air bleeding.
Dirty hydraulic fluid - The fluid must be changed.
Hydraulic pump failure - Repair or replace hydraulic fluid pump.
Faulty hydraulic spool valve - Repair or change the valve.
Hydraulic cylinder failure - Repair or install a new hydraulic cylinder.

Steering Troubleshooting
Heavy steering

Incorrectly mounted or defective steering column - Mount the steering column correctly or replace it.
Air in the hydraulic steering system - Bleed the steering system.
Incorrect toe-in - Adjust toe-in wheels.
Front tires wear unevenly - Change the tires.
Hydraulic steering pump is defective - Repair or replace steering pump.
Pump flow control valve is damaged or stuck - Clean or replace control valve.
Insufficient steering oil - Need to add steering oil.

Excessive free play of steering wheel

Steering column shaft or coupling is worn out - Replace defective component.
Steering pump malfunction - Replace or repair steering pump.
Steering linkage assembly is worn or loose - Inspect and replace as required.

Tractor is pulling to right or left

Front tires wear unevenly - Change the tires.
Not adjusted toe-in - Adjust toe-in properly.
Steering linkage components are loose or worn - Inspect and change as required.
Defective or improperly adjusted front wheel bearings - Adjust correctly or install new bearings.

Electrical Troubleshooting
Battery does not charge

Loose or corroded cable connections - Clean or tighten wiring connections.
Electrical terminal connectors are faulty - Install new terminal connectors.
Bad cell in battery - Use a new battery.
Loose or defective belt - Adjust belt tension or change the belt.

Starter cranks slowly

Battery power is low - Recharge the battery.
Battery is draining quickly - Service charging system or install new battery.
Disconnected wires or corroded battery terminals - Check cables and clean or change terminals.

Starter is not working

Battery is low or faulty - Need to charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output - Battery is drained, charge it.
Faulty starter motor - Starter should be changed.



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