Gorman-Rupp Pumps 13A65-B 776101 and up - Manual (Page 32)

OM-02146 10 SERIES
MAINTENANCE & REPAIR PAGE E - 9
This seal is not designed for operation at
temperatures above 160
_F (71_C). Do not
use at higher operating temperatures.
Position the seal plate (14) on a flat surface with the
impeller side down. Assemble the stationary seat
and gaskets in the seal clamp (34) with the white
gasket toward the seal cavity side of the stationary
seat. Secure the seal cap and stationary seal com­
ponents to the seal plate with the nuts (38).
Slide the seal plate over the shaft until fully seated
against the pedestal (20). Be careful not to dam­
age the seal stationary seat on the shaft threads.
Align the pipe plug (13) with the pedestal opening
and temporarily secure the seal plate to the pedes­
tal using two capscrews and nuts (3/8‐16 UNC X 1
1/2 inch long, not supplied).
Slide the rotating portion of the seal onto the lubri­
cated shaft sleeve to the dimension (or scribed
line) noted during disassembly. Secure the station­
ary portion of the seal to the sleeve by tightening
the setscrews in the seal retainer.
Slide the sleeve and rotating portion of the seal
onto the shaft until the seal elements contact.
Impeller Installation and Adjustment
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (9) as previously removed, and screw the
impeller onto the shaft until tight.
A clearance of .020 to .040 inch (0,51 to 1,02 mm)
between the impeller and the seal plate is neces­
sary for maximum pump efficiency. Measure this
clearance and add or remove impeller shims until
this clearance is reached.
NOTE
Be sure the seal plate is tight against the pedestal
while measuring this clearance.
Pump Casing Installation
Remove the hardware temporarily securing the
seal plate to the pedestal. Install the same thick­
ness of pump casing gaskets (36) as previously re­
moved and secure the pump casing (1) to the seal
plate (35) and pedestal (25) with the nuts (34). Do
not fully tighten the nuts at this time.
NOTE
The back cover assembly must be in place to adjust
the impeller face clearance.
A clearance of .008 to .015 inch (0,20 to 0,38 mm)
between the impeller and the wear plate (38) is also
recommended for maximum pump efficiency. Set
this clearance by adding or removing gaskets in
the pump casing gasket set (36) until the impeller
scrapes against the wear plate when the shaft is
turned by hand. After the impeller scrapes, add ap­
proximately .008 inch (0,20 mm) of gaskets.
After the face clearance has been set, tighten the
nuts (34) securing the pump casing to the pedes­
tal.
Back Cover Installation
If the wear plate (38) was removed for replace­
ment, secure it to the cover plate (43) using the at­
taching hardware (39 and 40) at this time. The wear
plate must be concentric to prevent binding when
the back cover is installed.
Clean any scale or debris from the contacting sur­
faces on the pump casing that might prevent a
good seal with the back cover. Replace the back
cover gasket (41) and slide the back cover assem­
bly into the pump casing. Be sure the wear plate
does not bind against the impeller.
NOTE
To ease future disassembly, apply a film of grease
or `Never‐Seez' on the back cover shoulder, or any
surface that contacts the pump casing. This action
will reduce rust and scale build‐up.
Secure the back cover assembly by installing the
clamp bar (48) and tightening the clamp bar screw
(47). Do not over‐tighten the clamp bar screw; it