Gorman-Rupp Pumps 11 1/2A2-E2 1P 1046838 and up - Manual (Page 28)

OM-04092 10 SERIES
MAINTENANCE & REPAIR PAGE E - 7
This seal is not designed for operation at
temperatures above 110
_F (43_C). Do not
use at higher operating temperatures.
Before installing the seal, inspect the bore of the
seal liner (21) for wear or grooves that might cause
leakage or damage to the seal packing rings. If the
seal liner must be replaced, position the intermedi­
ate on the bed of an arbor (or hydraulic) press and
use a new liner to force the old one out. After the
new liner is installed, drill a 1/4 inch diameter hole
through it to permit the flow of lubricant to the seal.
Be careful to center the drill in the threaded hole so
not to damage the threads. Deburr the hole from
the inside of the seal liner after drilling.
Secure the intermediate to the motor with the pre­
viously removed hardware (22 and 23). Be sure the
rotation decal (17) is up.
Slide the slinger ring (18) onto the shaft.
Install the inboard rotating element into the lubri­
cated seal liner with the chamfered side toward the
shaft shoulder. Subassemble the inboard station­
ary seat, packing ring and stationary washer. Press
this subassembly into the seal liner. A push tube
cut from a length of plastic pipe would aid this in­
stallation. The O.D. of the pipe should be approxi­
mately the same diameter as the O.D. of the seal
spring.
Slide the spacer sleeve onto the shaft until it seats
against the inboard rotating element and install the
seal spring. Subassemble the outboard stationary
seat, packing ring and stationary washer. Press
this subassembly into the lubricated seal liner.
Install the outboard rotating element with the
chamfered side toward the inside of the intermedi­
ate. Reinstall the grease cup and piping (14, 15
and 16) and lubricate the seal assembly as indi­
cated in LUBRICATION after the impeller has been
installed.
Impeller Installation and Adjustment
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (11) as previously removed, and screw the
impeller onto the shaft until tight.
A clearance of .010 to .012 inch (0,25 to 0,29 mm)
between the impeller and the intermediate is nec­
essary for maximum pump efficiency. Measure this
clearance and add or remove impeller shims until
this clearance is reached.
Pump Casing Installation
Install the same thickness of pump casing gaskets
(25) as previously removed, and secure the pump
casing to the intermediate (24) with the nuts (13).
Do not fully tighten the nuts at this time.
NOTE
The back cover assembly must be in place to adjust
the impeller face clearance.
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. Set this
clearance by adding or removing gaskets in the
pump casing gasket set (25) until the impeller
scrapes against the wear plate when the shaft is
turned. After the impeller binds, add approximately
.008 inch (0,20 mm) of gaskets.
After the face clearance has been set, tighten the
nuts (13) securing the pump casing to the interme­
diate.
Secure the pump casing to the base with the pre­
viously removed hardware. Be sure to reinstall any
leveling shims used under the casing mounting
feet.
Back Cover Installation
If the wear plate (26) was removed for replace­
ment, secure it to the cover plate (29) using the at­
taching hardware (33 and 34) at this time. The wear
plate must be concentric to prevent binding when
the back cover is installed.
Clean any scales or debris from the contacting sur­
faces on the pump casing that might prevent a
good seal with the back cover. Replace the back
cover gasket (28) and slide the back cover assem­
bly into the pump casing. Be sure the wear plate
does not bind against the impeller.
NOTE
To ease future disassembly, apply a film of grease