Gorman-Rupp Pumps T6A71S-B /F,/FM - Manual (Page 35)

OM-05351 SUPER T SERIES
MAINTENANCE & REPAIR PAGE E - 13
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 2)
Inspect the impeller, and replace it if cracked or
badly worn. Inspect the impeller and shaft threads
for dirt or damage, and clean or dress the threads
as required.
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 (3) as previously removed. Apply `Never‐
Seez' or equivalent to the shaft threads and screw
the impeller onto the shaft until tight. Be sure the
seal spring seats squarely on shoulder on the back
side of the impeller.
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 recom­
mended for maximum pump efficiency. Measure
this clearance, and add or remove impeller adjust­
ing shims as required.
NOTE
Proceed with Rotating Assembly Installation be­
fore installing the impeller capscrew and washer
(26 and 27). The rotating assembly must be in­
stalled in the pump casing in order to torque the im­
peller capscrew.
After the rotating assembly is installed in the pump
casing, coat the threads of the impeller capscrew
(26) with `Never‐Seez' or equivalent compound,
and install the impeller washer (27) and capscrew;
torque the capscrew to 90 ft. lbs. (1080 in. lbs. or
12,4 m. kg.).
Rotating Assembly Installation
(Figure 1)
NOTE
There is a 1‐1/2 inch diameter socket head pipe
plug located in the side of the bearing housing. This
hole is required for manufacturing purposes only;
therefore the pipe plug should never require remov­
al.
Install the bearing housing O‐ring (9) and lubricate
it with light grease. Ease the rotating assembly into
the pump casing using the installation tool. Be
careful not to damage the O‐ring.
Install the rotating assembly adjusting shims (33)
and secure the rotating assembly to the pump cas­
ing with the hardware (14 and 32).
To set the impeller and wear plate clearance, refer
to the Back Cover Installation And Adjustment.
Suction Check Valve Installation
(Figure 1)
Inspect the check valve assembly (23) and replace
it if badly worn.
NOTE
The check valve assembly must be replaced as a
complete unit. Individual parts are not sold sepa­
rately.