Gorman-Rupp Pumps PA4A60C-B-E30 575/3 1482736 and up - Manual (Page 48)

OM−06440 PA SERIES
MAINTENANCE & REPAIR PAGE E − 21
when reusing an old seal. The rubber bel-
lows will adhere to the sleeve during use,
and attempting to separate them could
damage the bellows.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak-
age. Inspect the integral shaft sleeve for nicks or
cuts on either end. If any components are worn, or
the sleeve is damaged, replace the complete seal;
never mix old and new seal parts.
Install the stationary seal element in the stationary
seat. Press this stationary subassembly into the
seal plate bore until it seats squarely against the
bore shoulder. A push tube made from a piece of
plastic pipe would aid this installation. The I.D. of
the pipe should be slightly larger than the O.D. of
the shaft sleeve.
Slide the rotating portion of the seal (consisting of
the integral shaft sleeve, spring centering washer,
spring, bellows and retainer, and rotating element)
onto the shaft until the seal faces contact.
Proceed with Impeller Installation and Adjust-
ment.
Impeller Installation And Adjustment
(Figure 4)
Inspect the impeller (1) and replace it if cracked or
badly worn.
The shaft and impeller threads must be
completely clean before reinstalling the im-
peller. Even the slightest amount of dirt on
the threads can cause the impeller to seize
to the shaft, making future removal difficult
or impossible without damage to the im-
peller or shaft.
Install the same thickness of impeller adjusting
shims (2) as previously removed and screw the im-
peller onto the shaft until tight.
NOTE
At the slightest sign of binding, immediately back
the impeller off, and check the threads for dirt. Do
not try to force the impeller onto the shaft.
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.
Pump Casing and Wear Plate Installation and
Adjustment
(Figure 3)
If the wear plate assembly (7) was removed, posi-
tion the pump casing (1) horizontally on the work
surface. Position the replacement ring in the pump
casing and secure it with the previously removed
hardware (2 and 3).
Reposition the pump casing on a the work surface
with the rotating assembly end positioned up. Sup-
port the pump casing using wood blocks or other
suitable material. Make sure the pump assembly is
secure and stable before proceeding with pump
disassembly.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam-
age to equipment. If slings or chains are
used to move the pump or components,
make sure that the load is balanced;
otherwise serious personal injury or
death could result. Suction and dis-
charge hoses and piping must be re-
moved from the pump before lifting.
(Figure 4)
Install a pair of S" hooks in two opposing holes in
the mounting flange (18). Connect a sling and suit-
able lifting device to the S" hooks.
Lubricate the O-rings (11 and 13) with light grease,
and install them in the grooves in the bearing hous-
ing and seal plate. Use the lifting device to lower
the rotating assembly (8) into the pump casing.