Sterling Trucks Acterra MX - Manual (Page 47)

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
Acterra ® Workshop
Manual.
f200581 05/30/2002
Fig. 8, Checking for Air Leaks (Horton DriveMaster)
Engine Cooling/Radiator
20
Acterra Maintenance Manual, January 2007 20/7