SB-7-632 Page 37
These impeller-to-impeller and impeller-to-case clearances are extremely critical. Even though the
blower may turn freely by hand when cold, under operating conditions, the parts expand, and the
rotors are subject to slight defection.
If the clearances are not sufficient, the impellers may contact each other or the housing with
destructive results. If the clearances are too great, the blower may not develop the pressure or
airflow that is required to perform its function.
14. Impeller tip to case clearance should be checked at this time by inserting the correct thickness feeler gauge
between the tip and the case and rotating the impeller (see FIGURE 7-4, page 34). Repeat the procedure on
both impellers.
NOTICE
When checking the tip to case clearance, move the feeler gauge over the entire length of the impeller
to ensure that the tips do not bind along their length.
FIGURE 7-8
NOTICE
Replacement gears have minimum backlash marks on the outside diameter of the gear face. These
marks should be located 180 degrees from each other (see FIGURE 7-8).
NOTICE
The gear used for adjustment should be flush with its mate on completion
of the timing.
NOTICE
If any of the four gear backlash readings are not within the specified limits, the gears must be
replaced.
15. Replace drive shaft oil seal (31) in the drive end cover (29). The seal lip should always face towards the
bearing or lubricant.
Grease Units
Pack bearing cavities with recommended grease and secure drive cover with socket head cap screws (30) to
drive headplate.
Dual Splash Units
Install drive end gasket (7). Gently slide the drive end cover (29) over the drive shaft and tap cover down over
dowel pins until flush. Install and tighten drive cover bolts (30).
Refer to FIGURE 7-9, for torque specifications.
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