freightliner CL112 2015, Maintenance Manual

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If the fan clutch does not operate correctly, see
Group 20 of the Columbia® Workshop Manual
for troubleshooting and repair procedures.
8. 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 assem-
bly, and the air hoses and fittings. See
Fig. 8 .
Using a wet finger or a soapy water solution,
check for a leak in the same areas.
9. If a leak is detected, remove the fan blade. In-
stall a new seal kit. See
Group 20 of the
Columbia® Workshop Manual for repair proce-
dures.
10. Check the fan drive for discoloration or any other
signs of slipping or overheating.
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.
11. Check the fan clutch bearings.
11.1 Turn the fan in both directions and feel
for worn hub bearings.
11.2 If possible, remove the drive belt and
check for worn sheave bearings by turn-
ing the sheave in both directions.
11.3 If either the hub or sheave bearings are
worn, replace them, using a Horton Drive-
Master Super Kit.
For instructions and kit part number, see
Group 20 of the Columbia® Workshop
Manual .
f200581 10/05/2016
Fig. 8, Checking for Air Leaks (Horton DriveMaster)
Engine Cooling/Radiator
20
Columbia Maintenance Manual, September 2015
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