Blower Repair & Maintenance Manual #34-05198-6 v1.2 11.2014
12
DETERMINING PROPER IMPELLER CLEARANCE
(con’t)
The following drawing illustrates how to check the minimum end clearances at the drive and gear end of
the blower. The hammer is used to ensure that the play that is inherent in the spherical bearings is to the
appropriate side and the clearance measurement is truly a minimum clearance measurement. Once
again this minimum spec should be taken at the tightest point. This means that when the shims and
cartridges are tightened into place and each impeller is hit down toward the drive end that (for a 614
blower) a .012 in feeler gauge should slide through with no more tension then the standard feeler
gauge test everywhere between the headplate and impellers.
Fig. 13
Checking Minimum End Clearances