Gorman-Rupp Pumps T10A71S-B /FM - Manual (Page 36)

OM-05353 SUPER T SERIES
MAINTENANCE & REPAIR PAGE E - 14
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
(Figure E‐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 (34) as previously removed. Apply `Never‐
Seez' or equivalent compound to the shaft threads
and screw the impeller onto the shaft until tight. Be
sure the seal spring seats squarely over the shoul­
der on the back side of the impeller.
NOTE
At the slightest sign of scraping, immediately back
the impeller off, and check the threads for dirt. Do
not try to force the impeller onto the shaft.
A clearance of .020 to .025 inch (0,51 to 0,64 mm)
between the impeller and the wear plate is recom­
mended for maximum pump efficiency. Measure
this clearance, and add or remove impeller adjust­
ing shims as required.
NOTE
If the rotating assembly has been installed in the
pump casing, this clearance may be measured by
reaching through the priming port with a feeler
gauge.
After the rotating assembly is installed in the pump
casing, coat the threads of the impeller capscrew
(28) 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 E‐1)
Install the bearing housing and seal plate O‐rings
(36 and 37), and lubricate them with light grease.
Ease the rotating assembly into the pump casing
using the installation tool. Be careful not to dam­
age the O‐rings.
Install the pump casing ring (22), and secure it to
the rotating assembly with the inner hardware (25
and 26).
NOTE
The inner capscrews are 1/4 inch (3,2 mm) shorter
than the outer capscrews.
Install an equal thickness of rotating assembly
shims (21) under the pump casing ring, and secure
the ring to the pump casing with the outer hard­
ware (23 and 24).
NOTE
If the pump has been completely disassembled, it
is recommended that the wear plate (38) and suc­
tion head (49) be reinstalled at this point. The suc­
tion head and wear plate must be in place to adjust
the impeller face clearance.
A clearance of .020 to .025 inch (0,51 to 0,64 mm)
between the impeller and the wear plate is also rec­
ommended for maximum pump efficiency. This
clearance can be obtained by removing an equal
amount of shims from each rotating assembly
shim set (21) until the impeller scrapes against the
wear plate when the shaft is turned by hand. After
the impeller scrapes, add approximately .020 (0,51
mm) of shims to each shim set.
NOTE
An alternate method of adjusting this clearance is to
reach through the suction port with a feeler gauge
and measure the gap. Add or subtract rotating as­
sembly shims accordingly.