Gorman-Rupp Pumps 84A2-F3L 1348524 and up - Manual (Page 34)

80 SERIES OM−00900
MAINTENANCE & REPAIR PAGE E − 14
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 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 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 2)
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.
Remove the two capscrews temporarily securing
the seal plate, and install the same thickness of
pump casing gaskets (37) as previously removed.
Use the lifting device to position the pump casing
over the impeller, and secure the pump casing and
seal plate to the intermediate with the nuts (35). Do
not fully tighten the nuts until the impeller face
clearance has been set.
A clearance of .008 to .015 inch (0,20 to 0,38 mm)
between the impeller and the wear plate is also rec-
ommended for maximum pump efficiency. This
clearance can be obtained by removing gaskets
from the casing gasket set until the impeller binds
against the wear plate when the shaft is turned. Af-
ter the impeller binds, add approximately .008 inch
(0,20 mm) of gaskets.
NOTE
An alternate method of adjusting this clearance is to
reach through the discharge port and measure the
clearance with a feeler gauge. Add or subtract
pump casing gaskets until the proper impeller
clearance is attained.
See Figure 1 and reinstall any leveling shims used
under the pump casing mounting feet, and secure
the casing to the base (47) with the hardware (48,
49, 50 and 51).
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.