Gorman-Rupp Pumps PA4E71C-3TNV88-SE 1416614 and up - Manual (Page 55)

OM−06244 PA SERIES
MAINTENANCE & REPAIR PAGE E − 33
Do not attempt to separate the rotating
portion of the seal from the shaft sleeve
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 10)
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.
Apply a small amount of ‘Never-Seez’ or equivalent
anti-lock compound on the shaft threads. Screw
the impeller 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 Installation
(Figure 10)
Lubricate the O-rings (31 and 32) with light grease,
and install them in the grooves in the bearing hous-
ing and seal plate. Slide the pump casing over the
rotating assembly. Be careful not to damage the
O-rings.
Install the adjusting shims (22) and secure the
pump casing to the rotating assembly with the
hardware (29 and 30).
Wear Plate and Suction Adaptor Installation
(Figure 10)
If the wear plate (5) was removed for replacement,
install new O-rings (33 and 41) on the wear plate
and lubricate them with light grease. Slide the wear
plate studs through the holes in the suction adap-
tor (64). Press the wear plate into the suction adap-
tor until fully seated.
Install new O-rings (40 and 45) in the grooves in the
suction adaptor and lubricate them with light
grease. Clean any scale or debris from the contact-
ing surfaces in the pump casing that might inter-
fere or prevent a good seal with the suction adap-
tor.
Slide the suction adaptor and wear plate into the
pump casing. Secure the suction adaptor to the
suction support bracket (42) and pump casing
with the hardware (10 and 48). Reinstall the re-
maining suction adaptor hardware (10 and 62). Se-
cure the suction adaptor bracket to the base with
the previously removed hardware.