Gorman-Rupp Pumps 14D52-12LD477 S/G 1344732 and up - Manual (Page 29)

OM−05968 10 SERIES
MAINTENANCE & REPAIR PAGE E − 11
tube and onto the shaft. Remove the tube, and
continue to slide the O-ring down the shaft until it
seats against the shaft shoulder.
Slide the sleeve and assembled rotating portion of
the seal onto the shaft until the seal faces contact.
Continue to push the sleeve through the seal until
the sleeve seats squarely against the shaft shoul-
der.
Install the seal spring and spring retainer (16).
Lubricate the seal as indicated in LUBRICATION,
after the impeller has been installed.
Impeller Installation And Adjustment
(Figure 3)
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (17) 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 reached.
Pump Casing Installation
(Figure 3)
Install the same thickness of pump casing gaskets
(18) as previously removed and secure the pump
casing (1) to the intermediate with the nuts (13). 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 .015 inch (0,38 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.
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 to the
base (3) with the hardware (13, 14, 15 and 16). Be
sure to reinstall any leveling shims used under the
mounting feet of the pump casing.
Back Cover Installation
(Figure 3)
Inspect the wear plate (23) and replace it if badly
worn or grooved. Install the wear plate on the back
cover using the hardware (24 and 25).
Clean any scale or debris from the back cover
shoulder and pump casing which might prevent a
good seal.
Replace the back cover gasket (26) and slide the
back cover assembly (29) into the pump casing.
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.
Secure the back cover assembly to the pump cas-
ing using the hardware (27 and 28). Do not over-
tighten the wing nuts; they should be just tight
enough to ensure a good seal at the back cover
shoulder.
Check for any scraping or binding and correct any
that exists before putting the pump back into ser-
vice.
Suction Check Valve Installation
(Figure 3)
Inspect the check valve components and replace
as required. Subassemble the check valve weights
and check valve gasket with the previously re-
moved hardware (not shown).
Position the check valve assembly (4) in the suc-
tion port with the large weight toward the inside of
the pump casing. Install the suction flange (30) and
secure with the nuts (31). Check the operation of