Horton DriveMaster® Fan Clutch
49X mm 20.03.002
- Disconnect the batteries at the negative terminals..
- Inspect the electrical connections and wires to the fan clutch solenoid. Secure the connection if loose; replace wires and connectors if damaged.
- Check the fan for bent, cracked, or damaged blades. Replace if damaged. Check for adequate clearance between the fan and other components.
- Check the fan belt for wear, tension, and alignment. Correct if necessary.
- Check for wear on the friction facing. Replace the friction facing if it is worn to a 3/16-inch (4.8-mm) thickness or less. Also check the facing for signs of oil contamination or burn marks. If evidence of oil or burn marks are found, replace the friction facing.
- Connect the battery cables. Start the engine, and charge the air system to 120 psi (827 kPa). Manually engage and disengage the fan clutch. Check the fan and fan clutch from a distance. Look for vibration, fan blade contact, fan clutch slippage, and overall fan clutch operation. If the fan clutch does not operate correctly, repair it.
- With the air system charged to 120 psi (827 kPa), check
the fan clutch for audible air leaks, using a suitable listening device.
Check at the solenoid valve, the air filter assembly, and the air
hoses and fittings . Using a wet finger or a soapy water solution,
check for a leak in the same areas. See Fig. and Fig..
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IRON PULLEY
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ALUMINUM SPRING HOUSING
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FRICTION LINER
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FMFD
Fig. 1, Wear Measurement
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IRON PULLEY
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ALUMINUM SPRING HOUSING
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FRICTION LINER
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FMFD
Fig. 2, Checking for Air Leaks (Horton DriveMaster)
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- If a leak is detected, remove the fan blade. Install a new seal kit.
- Check the fan drive for discoloration or any other signs of slipping or overheating.
- Check the fan clutch bearings as follows.
Note: The fan clutch may slip if the air supply
pressure is below 70 psi (483 kPa) or if there is a leak inside the
fan clutch. Any leak must be remedied.
Note: