Gorman-Rupp Pumps 83D20-B 733876 and up - Manual (Page 30)

OM-00889 80 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 oil seal (12) in the oil reservoir cap (30)
bore with the lip positioned as shown in Figure 1.
Press the oil seal into the bore until fully seated.
Position the seal plate on a flat surface with the im­
peller side facing up. Lubricate the stationary seat
O‐ring with water or light oil, and press the station­
ary subassembly into the seal plate until fully
seated. After installation, wipe the face of the sta­
tionary element lightly in a concentric pattern with a
clean, lint‐free tissue.
Position the oil reservoir cap over the shaft and
against the pedestal (16). Install a new gasket (33)
and carefully position the assembled seal plate
and stationary portion of the seal over the shaft and
against the oil reservoir cap and pedestal. Tempo­
rarily secure the parts to the pedestal using two
capscrews and nuts (1/2 UNC X 2 inches long, not
supplied).
Lubricate the O.D. of the shaft sleeve (56) with wa­
ter or a very small amount of oil, and slide the rotat­
ing portion of the seal assembly (consisting of the
rotating element, bellows and retainer) onto the
shaft sleeve until the face of the rotating element is
just flush with the chamfered end of the sleeve.
Slide the assembled seal and sleeve onto the shaft
until the seal faces contact. Continue to press the
shaft sleeve through the rotating portion of the seal
until it is fully seated against the shaft shoulder. Use
caution not to roll or damage the lip of the seal (12).
Install the seal spring.
Lubricate the seal as indicated in LUBRICATION
at the end of this section.
Impeller Installation and Adjustment
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (57) as previously removed, and screw the
impeller onto the shaft until tight.
A clearance of .010 to .020 inch (0,25 to 0,51 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.
After the back clearance is set, secure the impeller
with the hardware (37, 38 and 39).
Pump Casing Installation
If the wear plate (36) was removed, install the new
wear plate in the pump casing and secure it with
the hardware (40, 41, 43 and 44). Be sure to install
new fiber washer (44) and do not over‐tighten the
capscrew (43). Over‐tightening the capscrew can
crush the fiber washer, resulting in leakage.
Remove the hardware temporarily securing the
seal plate to the pedestal. Install the same thick­
ness of pump casing gaskets (34) as previously re­
moved. Secure the pump casing, seal plate and
seal reservoir cap to the pedestal with the nuts
(32). Do not fully tighten the nuts at this time.
A clearance of .008 to .015 inch (0,20 to 0,38 mm)
between the impeller and the wear plate is also rec­
ommended for maximum pump efficiency. Set this
clearance by adding or removing gaskets in the
pump casing gasket set (34) 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.
Secure the pump casing to the base with the pre­
viously removed hardware. Be sure to reinstall any
leveling shims used under the mounting feet of the
pump casing.
Fill the seal reservoir through the opening for the
bottle oiler (9) with SAE No. 30 non‐detergent oil,
then reinstall the bottle oiler and piping (9, 10 and
11) in the seal reservoir cap.
If a lifting eye was used to move the pump casing,
be sure to remove the lifting eye from the pump
casing.