Gorman-Rupp Pumps 12C20-B 1341727 and up User Manual

Page 32

OM-00608

10 SERIES

MAINTENANCE & REPAIR

PAGE E - 9

IMPELLER

SHAFT

IMPELLER

SHIMS

SHAFT

SLEEVE

STATIONARY

SEAT

ROTATING ELEMENT

SPRING CENTERING

WASHER

SPRING

SEAL PLATE

O‐RINGS

BELLOWS

RETAINER

STATIONARY

ELEMENT

Figure E-3. Seal Assembly

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 (40) on a flat surface with the
impeller side down. Apply a light coating of oil to
the oil seal (18) 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 (31). Be careful not to dam
age the lip of the oil seal (18) on the shaft threads.

Align the flat of the seal plate at the 12:00 position
and the threaded hole for the air vent (15) with the

opening in the top of the pedestal and temporarily
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 (61) 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 (18). 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