Gorman-Rupp Pumps 112E60-B 1408480 and up - Manual (Page 32)

10 SERIES OM-00905
MAINTENANCE & REPAIR PAGE E - 10
achieve maximum pump efficiency. Use a feeler
gauge to measure this clearance and add or re­
move impeller adjusting shims as required.
NOTE
If the pump casing (1) has been secured to the ped­
estal assembly, this clearance may be obtained by
removing shims until the impeller scrapes against
the seal plate when the shaft is turned by hand. After
the impeller scrapes, add approximately .010 inch
(0,25 mm) of shims and reinstall the impeller.
Check to ensure there is no scraping or binding be­
fore proceeding with pump reassembly.
Make sure the threads on the impeller capscrew
(78) and the tapped threads in the impeller shaft
are clean (degreased). Install the roll pin and im­
peller washer (79 and 80). Apply four drops of
“Loctite Threadlocker No. 242‐31” or equivalent
around the circumference of the capscrew
threads, one inch from the end of the capscrew.
Install the capscrew and torque to 145 ft. lbs. or
1740 in. lbs. (20 m. kg.).
Pump Casing Installation
Ensure that the seal plate O‐ring (22) is installed
and lubricated with light grease or a very small
amount of oil. Secure the pump casing and bottle
oiler bracket (39) to the pedestal assembly with the
hardware (38, 54 and 55).
Reinstall the bottle oiler (40). Remove the plug from
the hose (36), reconnect it to the male connector
(35) in the seal plate and secure with the clamp
(37).
If removed, replace the discharge flange gasket
(20) and secure the reducer (18) with the hardware
(15, 16 and 17). Reconnect the discharge piping.
Wear Plate And Suction Elbow Installation
Lubricate the wear plate O‐ring (66) with “Never‐
Seez” or equivalent and install it in the groove in the
wear plate (67). Press the wear plate into the suc­
tion elbow (70) and secure it with the hardware (64
and 65).
Lubricate the wear plate O‐ring (58) with “Never‐
Seez” or equivalent and install it in the groove on
the wear plate. Secure the suction elbow and wear
plate to the pump casing with the hardware (12, 13,
61 and 62).
A clearance of .010 to .020 inch (0,25 to 0,51 mm)
between the impeller and the wear plate is also rec­
ommended for maximum pump efficiency. To ad­
just this clearance, back off the jam nuts (11) until
they contact the heads of the wear plate adjusting
screws (12). Loosen the hardware (64 and 65) se­
curing the wear plate to the suction elbow. Tighten
the adjusting screws evenly, no more than a half
turn at a time, while rotating the impeller shaft by
hand until the wear plate scrapes against the im­
peller. Back off each of the adjusting screws 1/2
turn, then tighten the jam nuts until they are snug
against the suction head. Re‐tighten the hardware
(64 and 65).
Secure the pedestal foot (59) and suction elbow
support (69) to the pump casing using the hard­
ware (61, 62, 71 and 72). Reinstall any leveling
shims used under the pedestal foot and suction el­
bow support, and secure them to the base with the
previously removed hardware.
Suction Check Valve Installation
Install one stainless steel flat washer (87) on each
side of the bearing pivot arm. Position the check
valve (91) in the check valve body (89) with the 1/2”
diameter core holes toward the pump side of the
check valve body. Secure the check valve and piv­
ot caps (88) to the check valve body with the hard­
ware (85 and 90).
NOTE
Be sure the check valve is positioned so that the
1/2” diameter core holes face toward the interior of
the pump.
Secure the check valve body to the suction elbow
with the “Victaulic” coupling (4). Be sure the rubber
gasket is properly seated and not damaged.
Reach through the cover plate access opening
and check the operation of the check valve to en­
sure proper seating and free movement.