Gorman-Rupp Pumps 13C20-B 710764 and up - Manual (Page 33)

OM-00641 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 (35) on a flat surface with the
impeller side down. Apply a light coating of oil to
the oil seal (12) and press it into the seal plate with
the lip positioned as shown in Figure E-1.
Position the seal plate on a flat surface with the im­
peller side up. Press the stationary subassembly
(consisting of the stationary seat, O‐rings and sta­
tionary element) into the seal plate until fully seated
in the seal plate bore.
Slide the seal plate over the shaft until fully seated
against the pedestal. Be careful not to damage the
lip of the oil seal (12) on the shaft threads.
Align the threaded hole for the bottle oiler piping
with the opening in the top of the pedestal and tem­
porarily secure the seal plate using two capscrews
and nuts (3/8-16 UNC by 1-1/2 inches long, not
supplied).
Lubricate the shaft sleeve (13) with light oil and
slide the rotating subassembly (consisting of the
rotating element, retainer and bellows) onto the
sleeve until the rotating element is just flush with
the chamfered end of the sleeve. Slide the shaft
sleeve and rotating subassembly onto the shaft
until the sealing faces contact. Continue to push
the sleeve through the seal until it bottoms against
the shaft shoulder. Be careful not to damage or roll
the lip of the oil seal (12). Install the seal spring and
spring centering washer.
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 (11) 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.
Install the bottle oiler and piping (8, 9 and 10).
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 and pedestal 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 .010 to .020 inch (0,25 to 0,51 mm)
between the impeller and the wear plate (37) 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 .010 inch (0,25 mm) of gaskets.
After the face clearance has been set, tighten the
nuts (34) securing the pump casing to the pedes­
tal.
Suction Check Valve Installation
Inspect the check valve (57) and the other compo­
nents of the check valve assembly (53) and replace
any badly worn or damaged parts.
Position the spacer sleeves (56) in the holes in the
check valve. Insert the nylock capscrews (54)
through the backup plate (55) and check valve.
Screw the nylock capscrews into the adaptor (58)
until fully seated.
Reach through the back cover opening with the
check valve and position the check valve adaptor