Gorman-Rupp Pumps PA4A60C-B-E30 575/3 1482736 and up - Manual (Page 49)

PA SERIES OM−06440
MAINTENANCE & REPAIR PAGE E − 22
Align the holes in the bearing housing for the
mounting hardware (9 and 10) with those in the
pump casing.
Install the same thickness of adjusting shims (12)
as previously removed, and secure the rotating as-
sembly to the pump casing with the hardware (9
and 10). Do not fully tighten the capscrews until the
impeller face clearance has been set.
A clearance of .010 to .020 inch (0,25 to 0,5 mm)
between the impeller and the wear plate is also rec-
ommended for maximum pump efficiency. This
clearance can be obtained by adding or removing
an equal thickness of shims from each of the rotat-
ing assembly shim sets (12) until the impeller
scrapes against the wear plate when the shaft is
turned. After the impeller scrapes, add approxi-
mately .010 inch (0,25 mm) of shims to each shim
set.
After the face clearance has been set, tighten the
hardware securing the rotating assembly to the
pump casing.
Securing Pump End to Power Source
(Figure 1)
Install the coupling half on the impeller shaft. Using
a suitable lifting device, position the pump end as-
sembly on the base. Align the coupling halves and
reinstall the attaching hardware. Install the cou-
pling guard (6) and secure the drive flange to the
guard with the previously removed hardware (2
and 3).
Reinstall any leveling shims used under the pump
casing mounting feet and secure the pump assem-
bly to the pump support assembly (28) with the
previously removed hardware (25, 26 and 27).
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 squarely engages the valve seat. Replace
the orifice button if required (see Priming Cham-
ber 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 volute casing (1, Figure
2). 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.