Gorman-Rupp Pumps 112A20-B 814882 and up - Manual (Page 29)

OM−00701 10 SERIES
MAINTENANCE & REPAIR PAGE E − 9
amount of oil, and apply a drop of light lubricating
oil on the finished faces. Assemble the seal as fol- lows (see Figure E−4).
IMPELLER
SHAFT
IMPELLER
RETAINER
ROTATING
ELEMENT
STATIONARY
ELEMENT
SEAL PLATE
SEAT
STATIONARY
OIL
SEAL
O-RINGS
BELLOWS
SPRING
Figure E−4. 12590B Seal Assembly
This seal is not designed for operation at
temperatures above 160
_F (71_C). Do not
use at higher operating temperatures.
Lay the seal plate on a flat surface with the impeller
side up. Press the oil seal (31) into the seal plate
with the lip positioned as shown in Figure E−1.
Press the stationary subassembly (consisting of
the stationary seat, O-rings and stationary ele-
ment) into the seal plate until fully seated.
Slide the seal plate onto the shaft and secure it to
the pedestal (28) with the round head machine
screws (12). Use caution not to damage the sta-
tionary portion of the seal on the shaft shoulders.
Slide the rotating subassembly (consisting of the
rotating element, retainer and bellows) onto the lu-
bricated shaft until the seal elements contact. In-
stall the seal spring.
Reinstall the air vent and piping (6, 7 and 8) and
bottle oiler and piping (9, 10 and 11). Lubricate the
seal assembly as indicated in LUBRICATION, af-
ter the impeller is installed.
Impeller Installation
There is a wear ring welded to the impeller to form
the impeller assembly (3). Inspect the impeller and
wear ring for excessive wear, damage or cracks. If
the impeller or wear ring require replacement, the
complete assembly must be replaced; individual
parts are not sold separately.
Install the woodruff key (81) and press the impeller
onto the shaft until fully seated.
Remove the setscrews (63) from the impeller nut
(65). Apply Never-Seez" or equivalent compound
to the shaft threads and screw the impeller nut onto
the shaft. Immobilize the impeller as shown in Fig-