Gorman-Rupp Pumps 13E52-GX390 1368838 and up - Manual (Page 27)

OM−04734 10 SERIES
MAINTENANCE & REPAIR PAGE E − 9
Continue to push the sleeve through the seal until it
seats squarely against the shaft shoulder.
Install the seal spring and spring centering washer.
Lubricate the seal as indicated in LUBRICATION,
after the impeller has been installed.
Impeller Installation And Adjustment
(Figure 2)
Inspect the impeller and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (36) as previously removed and screw the
impeller onto the shaft until tight.
A clearance of .020 to .040 inch (0,51 to 1,02 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 achieved.
Pump Casing Installation
(Figure 2)
Install the same thickness of pump casing gaskets
(9) as previously removed and secure the pump
casing to the intermediate with the nuts (14). Do
not fully tighten the nuts at this time.
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. Install
the back cover and set this clearance by adding or
removing gaskets in the pump casing gasket set
until the impeller scrapes against the wear plate
when the shaft is turned. After the impeller scrapes,
add .008 inch (0,20 mm) of gaskets.
After the face clearance has been set, tighten the
hardware securing the pump casing to the inter-
mediate.
See Figure 1 and secure the pump casing (1) to the
base (3) with the previously removed hardware
(13, 14, and 15). Be sure to reinstall any leveling
shims used under the mounting feet of the pump
casing.
Back Cover Installation
(Figure 2)
Inspect the wear plate (15) and replace it if badly
worn or grooved. Install the wear plate on the back
cover assembly (23) using the hardware (16 and
17).
Clean any scale or debris from the back cover
shoulder and pump casing which might prevent a
good seal.
NOTE
Apply a film of ‘Never-Seez’ or equivalent com-
pound on the back cover shoulder or any surface
which contacts the pump casing to ease future dis-
assembly and to reduce rust and scale build up.
Replace the back cover gasket (19) and slide the
back cover assembly into the pump casing. Be
sure the wear plate does not bind against the
pump casing.
Secure the back cover assembly with the hard-
ware (21 and 22). Do not over tighten the wing
nuts; they should be just tight enough to ensure a
good seal at the back cover shoulder.
Suction Check Valve Installation
(Figure 2)
Inspect the check valve components and replace
as required. Subassemble the check valve weights
(30 and 33) and check valve gasket (34) with the
hardware (31 and 32).
Position the check valve assembly (29) in the suc-
tion port with the large weight (33) toward the in-
side of the pump casing. Install the suction flange
(35) and secure with the nuts (28). Check the oper-
ation of the check valve to ensure proper seating
and free movement.
Final Pump Assembly
(Figure 1)
Be sure the pump and engine are securely
mounted to the base.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure.