Gorman-Rupp Pumps PAH3A60C-B 1524589 and up User Manual

Page 38

OM-06472

PAH SERIES

MAINTENANCE & REPAIR

PAGE E - 17

SEAL PLATE

O‐RING

IMPELLER

SHAFT

STATIONARY

ELEMENT

ROTATING

ELEMENT

BELLOWS

IMPELLER

SHIMS

IMPELLER

SPRING

RETAINER

SHAFT

SLEEVE

O‐RING

SPRING

CENTERING

WASHER

SHAFT

KEY

Figure 8. Seal Assembly

This seal is not designed for operation at
temperatures above 160

F (71

C). Do not

use at higher operating temperatures.

If the seal plate was removed, install the seal plate
gasket (14). Position the seal plate over the shaft
and secure it to the pedestal with the hardware (16
and 17).

Press the stationary element and its O‐ring into the
seal plate until fully seated in the seal plate bore. A
push tube cut from a length of plastic pipe would
aid this process. The I.D. of the tube should be
slightly larger than the O.D. of the shaft sleeve (7).

Install the shaft sleeve O‐ring (8) in the groove in
the I.D. of the sleeve. Lubricate the O‐ring and the
O.D. of the shaft sleeve with “P-80

Emulsion” or

water. Do not use oil or any substitute lubricant
other than water.

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 seal faces contact and the shaft sleeve
seats against the shoulder on the impeller shaft.
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

(Figure 5)

Inspect the impeller (4) and replace it if cracked or
badly worn.

Install the same thickness of adjusting shims (5) as
previously installed. Install the impeller key (26) in
the shaft keyway. Align the keyway in the impeller
with the shaft key and press the impeller onto the
shaft until fully seated.

A clearance of .025 to .040 inch (0,64 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 adjusting
shims as required.