Operation and maintenance manual

Fan Hub, Belt Driven QSB4.5 and QSB6.7
Page 6-2 Section 6 - Maintenance Procedures at 1000 Hours or 1 Year
Check the location of the drive belt on the belt tensioner
pulley. The belt should be centered on, or close to the
middle of, the pulley. Misaligned belts, either too far
forward or backward, can cause belt wear, belt roll-offs, or
increase uneven tensioner bushing wear.
Remove the drive belt. Refer to Procedure 008-002 in
Section A.
With the belt removed, verify that the tensioner arm stop
is in contact with the spring case stop. If they are not
touching, the tensioner must be replaced.
Fan Hub, Belt Driven
Maintenance Check
Remove the drive belt.
NOTE: The fan hub must rotate without any wobble or
excessive end play.
Fan Hub End Play
mm in
0.15 MAX 0.006