Gorman-Rupp Pumps 14C2-4024T 1317426 and up - Manual (Page 36)

10 SERIES OM−05780
MAINTENANCE & REPAIR PAGE E − 14
the stationary seal seats, packing rings, stationary
washers, and spring onto the lubricated shaft
sleeve. Apply a drop of light oil on the precision fin-
ished faces of the stationary seats; never use
grease. Slide the entire subassembly into the lubri-
cated seal liner until it bottoms against the inboard
rotating element.
Install the outboard rotating element with the
chamfered side facing the impeller. Position the
seal spacer washer (75) on the shaft with the
chamfered side toward the shaft shoulder, and
slide it onto the shaft until fully seated.
Reinstall the automatic grease cup and piping (13,
15 and 16).
Lubricate the seal as indicated in LUBRICATION,
after the impeller has been installed.
Impeller Installation And Adjustment
(Figure E−2)
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 adjusting
shims (76) 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 (0,5 to1,0 mm) be-
tween the impeller and the seal plate is necessary
for maximum pump efficiency. Measure this clear-
ance, and add or remove impeller adjusting shims
as required.
NOTE
If the pump has been completely disassembled, it
is recommended that the wear plate (41) and back
cover assembly (49) be reinstalled at this point. The
back cover and wear plate must be in place to ad-
just the impeller face clearance.
Install the same thickness of pump casing gaskets
(39) as previously removed. Secure the pump cas-
ing to the intermediate with the nuts (38). Do not
fully tighten the nuts until the impeller face clear-
ance has been set.
A clearance of .010 to .020 inch (0,25 to 0,50 mm)
between the impeller and the wear plate is also rec-
ommended for maximum pump efficiency. This
clearance must be set after installing the back
cover, by adding or removing gaskets in the pump
casing gasket set until the impeller scrapes against
the wear plate when the shaft is turned by hand. Af-
ter the impeller scrapes, add approximately .010
inch (0,25 mm) of gaskets.
NOTE
An alternate method of adjusting this clearance is to
reach through the discharge port with a feeler
gauge and measure the gap. Add or subtract pump
casing gaskets accordingly.
If a lifting eye was used to move the pump casing,
be sure to remove the lifting eye from the pump
casing.
Do not attempt to lift the complete pump
unit using the lifting eye. It is designed
to facilitate removal or installation of in-
dividual components only. Additional
weight may result in damage to the
pump or failure of the eye bolt.
Suction Check Valve Installation
(Figure E−2)
Inspect the check valve assembly (57) and replace
it if badly worn.