Gorman-Rupp Pumps 81 1/2D3-B 359802 and up - Manual (Page 27)

80 SERIES OM−00749
MAINTENANCE & REPAIR PAGE E − 8
INTERMEDIATE
IMPELLER
SHAFT
STATIONARY
SEAT
STATIONARY
ELEMENT
ROTATING
ELEMENT
DRIVE BAND
IMPELLER
SHIMS
IMPELLER
SPRING
SEAT
RETAINER
SEAL
WASHER
BELLOWS
SPRING
SPRING
Figure 3. 25271−821 Seal Assembly
This seal is not designed for operation at
temperatures above 160
_ F (71_ C). Do
not use at higher operating temperatures.
Install the stationary seat element in the stationary
seat. Use your thumbs to press this subassembly
into the seal bore in the intermediate until fully and
squarely seated in the seal plate bore. After instal-
lation, wipe the stationary element sealing face
lightly in a concentric pattern with a clean, lint-free
cloth to remove any dirt or fingerprints.
Carefully slide the assembled intermediate and
stationary portion of the seal over the impeller shaft
(19) and secure the intermediate to the bearing
housing with the hardware (10, 11 and 12).
Slide the rotating portion of the seal assembly onto
the shaft until the seal faces contact.
Install the seal spring, spring seat and seal washer
(17).
Impeller Installation
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (16) as previously removed. Apply ‘Loctite
Retaining Compound No. 242’ or equivalent com-
pound on the shaft threads, and screw the impeller
onto the shaft until tight.
A clearance of .008 to .015 inch ( 0,20 to 0,38mm)
between the impeller and the vane plate (23) is
necessary for maximum pump efficiency. Position
the vane plate over the impeller, and use a feeler
gauge to measure this clearance. Add or remove
impeller shims until the proper clearance is
achieved.
After the impeller clearance is set, secure the im-
peller to the shaft with the impeller nut (28).