Gorman-Rupp Pumps 14A20-B 740693 and up - Manual (Page 32)

OM-00660 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.
Inspect the seal plate and replace it if cracked or
badly worn.
Place the seal plate on a flat surface with the impel­
ler side down. Apply a light coat of oil to the oil seal
(70) and press it into the seal plate (32) with the lip
positioned as shown in Figure E-1.
Slide the seal plate over the shaft until fully seated
against the pedestal (16). Be careful not to dam­
age the oil seal lip on the shaft threads. Align the
threaded seal lubricant hole with the pedestal
opening and temporarily secure the seal plate us­
ing two capscrews and nuts (1/2 UNC X 1‐1/2 inch
long, not supplied).
Press the stationary subassembly (consisting of
the stationary seat, O‐rings and stationary ele­
ment) into the seal plate until the stationary seat
bottoms against the seal plate bore. A push tube
cut from a length of plastic pipe would aid this in­
stallation. The I.D. of the pipe should be approxi­
mately the same diameter as the I.D. of the seal
spring.
Slide the rotating subassembly (consisting of the
rotating element, retainer and bellows) onto the lu­
bricated shaft sleeve until the rotating element is
just flush with the chamfered end of the sleeve.
Slide the sleeve and rotating subassembly onto
the shaft until the seal elements contact. Continue
to push the sleeve through the seal until it bottoms
against the shaft shoulder. Be careful not to dam­
age or roll the lip of the oil seal (70). Install the seal
spring and the spring centering washer.
Reinstall the bottle oiler and piping (66, 67 and 68),
and lubricate the seal assembly as indicated in
LUBRICATION, after the impeller has been in­
stalled.
Impeller Installation and Adjustment
Inspect the impeller and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (72) as previously removed. Apply `Never‐
Seez' or equivalent to the shaft threads 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 (33) as previously re­
moved and secure the pump casing to the seal
plate and pedestal with the nuts (31). 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 (34) is also
recommended for maximum pump efficiency. Set
this clearance by adding or removing gaskets in
the pump casing gasket set (33) 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 (31) securing the pump casing to the pedes­
tal.
Back Cover Installation
If the wear plate (34) was removed for replace­
ment, secure it to the cover plate (43) using the at­
taching hardware (37 and 38) at this time. The wear
plate must be concentric to prevent binding when
the back cover is installed.
Clean any scales or debris from the contacting sur­
faces on the pump casing that might prevent a
good seal with the back cover. Replace the back