Gorman-Rupp Pumps PA6C60C-B-E50 460/3 1528569 and up - Manual (Page 50)

OM-06531 PA SERIES
MAINTENANCE & REPAIR PAGE E - 23
and 26). Install the two remaining hand knobs
snugly against the adjusting screws.
Remove the first two back cover nuts from their
studs. Turn the adjusting screws clockwise until
they engage the pump casing. Install the locking
collars and hardware (7 and 26). Reinstall the back
cover nuts.
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 back cover side
of the pump, an additional 0.120 inch (3 mm) of ad­
justment may be obtained by removing the rotat­
ing assembly adjusting shims (15).
Allow an installed pump to completely cool before
draining liquid from the pump casing. Remove the
back cover. Remove the rotating assembly adjust­
ing shims, then reinstall the hardware securing the
rotating assembly to the pump casing. Perform the
back cover adjustment procedure described
above to obtain the proper face clearance.
Discharge Check Valve Reassembly And
Installation
(Figure 2)
If the discharge check valve (26) 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 to the pump as­
sembly (1).
Priming Chamber Assembly And Installation
(Figure 6)
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 5)
Install the baffle (9) and gasket (8) and use a sling
and suitable lifting device to position the priming
chamber assembly on the pump casing (1, Figure
3). Secure the priming chamber assembly with the
hardware (6 and 7).
Reconnect the air discharge tubing to the priming
chamber assembly. Reconnect the suction piping
to the suction spool.
LUBRICATION
(Figure 4)
Seal Assembly
Before starting the pump, remove the vented plug
(9) and fill the seal cavity with approximately 8
quarts (7,6 liters) of SAE No. 30 non‐detergent oil
or to the center of the sight gauge (3). Clean and