Gorman-Rupp Pumps 81 1/4B3-E.33 1P 24971 and up - Manual (Page 24)

80 SERIES OM−00793
MAINTENANCE & REPAIR PAGE E − 6
PUMP CASING
MOTOR
SHAFT
STATIONARY
SEAT
STATIONARY
ELEMENT
ROTATING
ELEMENT
DRIVE BAND
IMPELLER
SHIMS
IMPELLER
SPRING
RETAINER
BELLOWS
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.
If the pump casing was separated from the motor
at disassembly, secure the casing to the motor us-
ing the four long capscrews the pass through the
motor housing.
Install the stationary seat element in the stationary
seat. Use your thumbs to press this subassembly
into the seal bore in the pump casing until fully and
squarely seated in the pump casing bore. After
installation, wipe the stationary element sealing
face lightly in a concentric pattern with a clean, lint-
free cloth to remove any dirt or fingerprints.
Slide the rotating portion of the seal assembly onto
the motor shaft until the seal faces contact.
Install the seal spring.
Impeller Installation
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (5) as previously removed and screw the im-
peller onto the shaft until tight. Make sure the seal
spring seats squarely over the shoulder on the
back of the impeller.
A clearance of .006 to .012 inch ( 0,15 to 0,30 mm)
between the impeller and the suction head (10) is
necessary for maximum pump efficiency. Position
the suction head against the pump casing and use
a feeler gauge to measure this clearance. Add or
remove impeller shims until the proper clearance is
achieved.
Install a new gasket (8) in the groove in the pump
casing and secure the suction head to the casing
with the previously removed hardware (20 and 21).
If an open end wrench was used to immobilize the
motor shaft, remove the wrench and reinstall the
motor cover.