Gorman-Rupp Pumps PA4E71C-3TNV88-SE 1416614 and up - Manual (Page 56)

PA SERIES OM−06244
MAINTENANCE & REPAIR PAGE E − 34
Screw the four adjusting screws (43) into the
tapped holes in the suction adaptor until they
touch the wear plate. Use the lock collars (44) to
turn the adjusting screws in an alternating se-
quence until the wear plate just touches the impel-
ler.
Position the lock collars over the adjusting screws
so the holes in the collars for the locking screws
(46) align approximately with the corresponding
holes in the suction cover. Use the lock collars to
index the adjusting screws three detents counter-
clockwise. Remove the lock collars, index them
clockwise until the holes in the collars for the lock-
ing screws realign with the corresponding holes in
the suction adaptor and reinstall them on the ad-
justing screws.
Secure the wear plate to the suction adaptor by
installing the nuts (34). Secure the locking collars
to the back cover plate with the hardware (30 and
46).
Be sure the wear plate does not scrape against the
impeller.
Over time it may be necessary to repeat the adjust-
ment process to compensate for normal wear be-
tween the impeller and wear plate. When all of the
adjustment has been used on the suction side of
the pump, an additional 0.125 inch (3,2 mm) of ad-
justment may be obtained by removing the rotat-
ing assembly adjusting shims (75).
Allow an installed pump to completely cool before
draining liquid from the pump casing. Disengage
the hardware (29 and 30), remove the rotating as-
sembly adjusting shims, then reinstall the hard-
ware securing the rotating assembly to the pump
casing. Perform the suction adaptor adjustment
procedure described above to obtain the proper
face clearance.
Discharge Check Valve Reassembly and
Installation
(Figure 7)
If the discharge check valve (46) was disas-
sembled to replace the flapper or cover O-ring,
position the flapper in the valve body and check to
ensure free movement.
Install the valve cover O-ring and secure the cover
to the body with the previously removed hardware.
Apply a small amount of light grease to the dis-
charge flange gasket to hold it in place and posi-
tion it against the pump casing flange. Support the
discharge check valve assembly using a sling and
a suitable lifting device. Using the previously re-
moved hardware, secure the discharge check
valve assembly and flange gasket (49) to the ec-
centric reducer spool (50).
Priming Chamber Assembly And Installation
(Figure 12)
Clean and inspect the components of the priming
valve (1). Inspect the linkage and ensure the orifice
button (not shown) squarely engages the valve
seat. Replace the orifice button if required (see
Priming Chamber Removal and Disassembly
for orifice button removal).
If the orifice button was removed, screw the new
orifice button into the linkage bar until fully seated.
Align the hole in the linkage bar with the holes in the
bracket and reinstall the pivot pin. Secure the pivot
pin with the previously removed e-clip".
Adjust the orifice button seating as necessary by
screwing the orifice button into or out of the linkage
bar. Proper adjustment is achieved when the ori-
fice button fully seats against the orifice before the
linkage bar on the float bottoms against the
threads on the orifice button. When adjustment is
complete, install and tighten the lock washer and
hex nut securing the orifice button.
Install the strainer (6) and priming valve gasket (4).
Lower the float into the priming chamber (5) and
secure the priming valve with the previously re-
moved hardware (2 and 3).
(Figure 11)
Install the baffle (9) and gasket (8) and use a sling
and suitable lifting device to position the priming
chamber assembly on the hopper spool (not
shown). Secure the priming chamber assembly
with the hardware (6 and 7).
Reconnect the suction piping to the hopper spool
and the air discharge tubing to the priming cham-
ber assembly.