Gorman-Rupp Pumps 84A2-4024H 1488564 and up - Manual (Page 33)

80 SERIES OM−06412
MAINTENANCE & REPAIR PAGE E − 14
This seal is not designed for operation at
temperatures above 110
_F (43_C). Do not
use at higher operating temperatures.
Inspect the seal plate, seal liner, and the impeller
shaft for burrs or sharp corners, and remove any
that exist. Replace the seal liner (4) if wear or
grooves exist which could cause leakage or dam-
age to the seal packing rings.
To replace the seal liner, position the seal plate on
the bed of an arbor (or hydraulic) press and use a
new seal liner to press the old liner out. After the
new liner is properly installed, a 1/4-inch diameter
(6,35 mm) hole must be drilled through it to permit
the flow of lubricant to the seal assembly. Be care-
ful to center the drill in the threaded hole so not to
damage the threads in the pump casing. Deburr
the hole from the inside of the seal liner after drill-
ing.
Slide the seal plate onto the shaft until fully seated
against the intermediate. Align the threaded seal
lubricant hole with the intermediate opening, and
temporarily secure the seal plate to the intermedi-
ate with two capscrews and nuts (1/2 UNC by 1 1/2
inch long, not supplied).
Position the inboard rotating element on the shaft
with the chamfered side facing the shaft shoulder
and slide it on until fully seated.
Subassemble the inboard stationary seat, packing
ring and spring washer. Press this subassembly
into the lubricated seal liner. A push tube cut from a
length of plastic pipe would aid in this installation.
The O.D. of the pipe should be approximately the
same diameter as the O.D. of the seal spring.
Install the spacer sleeve and spring.
Subassemble the outboard stationary seat, pack-
ing ring and spring washer. Press this subassem-
bly into the lubricated seal liner. Install the outboard
rotating element with the chamfered side facing
the impeller.
Slide the seal spacer washer (21) onto the shaft
with the chamfered side facing the intermediate
bracket.
Reinstall the automatic grease cup and piping (14,
15 and 16) in the seal plate. Lubricate the seal as
indicated in LUBRICATION, after the impeller has
been installed.
Impeller Installation
(Figure 3)
Inspect the impeller, 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 shims (20) as
previously removed and 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 .020 to .040 inch (0,51 to 1,0 mm)
between the impeller and the seal plate is recom-
mended for maximum pump efficiency. Measure
this clearance and add or remove impeller shims
until it is reached.
NOTE
The seal plate must be tight against the intermedi-
ate while setting the back impeller clearance.
Pump Casing and Wear Plate Installation
(Figure 3)
If the wear plate (38) was removed for replace-
ment, secure the replacement wear plate to the
pump casing with the hardware (39 and 40) at this
time.