Gorman-Rupp Pumps 81 1/4A3-B 859498 and up - Manual (Page 28)

80 SERIES OM−00780
MAINTENANCE & REPAIR PAGE E − 8
SEAL PLATE
IMPELLER
SHAFT
STATIONARY
SEAT
STATIONARY
ELEMENT
ROTATING
ELEMENT
DRIVE BAND
IMPELLER
SHIMS
IMPELLER
SPRING
RETAINER
SPRING
CENTERING
WASHER
IMPELLER
NUT
BELLOWS
SEAL WASHER
Figure 3. 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
(18) and secure the intermediate to the bearing
housing with the hardware (19, 20 and 21).
Slide the rotating portion of the seal assembly onto
the shaft until the seal faces contact.
Install the seal spring, spring centering washer and
seal washer (30).
Impeller Installation
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (29) 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 .002 to .006 inch ( 0,05 to 0,15 mm)
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.
Vane Plate and Pump Casing Installation
Apply ‘3-M Adhesive EC-847’ or equivalent com-
pound to the back of the vane plate, and secure the
vane plate to the intermediate with the hardware ( 6
and 7). Check impeller-to-vane plate clearance as
described in Impeller Installation.
Install the vane plate O-ring (24) and the pump cas-
ing gasket (22). Carefully slide the pump casing