Gorman-Rupp Pumps PA4B60-4045H 1417817 thru 1497875 - Manual (Page 36)

PA SERIES OM−06228
MAINTENANCE & REPAIR PAGE E − 14
Priming Chamber Removal And Disassembly
(Figure 6)
Disconnect the air discharge tubing from the prim-
ing chamber assembly (3). Support the priming
chamber assembly using a sling and a suitable lift-
ing device. Remove the hardware (4 and 5) and
separate the priming chamber assembly, gasket
(8) and baffle (7) from the suction spool (4, Figure
3).
(Figure 7)
Remove the hardware (2 and 3) securing the prim-
ing valve (1) to the priming chamber (5). Carefully
lift the valve components from the priming cham-
ber. Remove the gasket (4) and clean the mating
surfaces.
If the priming valve float is stuck or the strainer (6) is
clogged, it can usually be cleaned without further
disassembly.
The only serviceable part of the priming valve is the
orifice button (not shown). If liquid continues to by-
pass through the priming chamber after adjusting
the orifice button (see Priming Chamber Reas-
sembly and Installation for adjustment), the but-
ton may require replacement. To replace the orifice
button, remove one of the e-clips" from the pivot
pin closest to the orifice button and remove the piv-
ot pin. This will allow the linkage to be raised high
enough to access the orifice button.
Remove the hex nut and lockwasher securing the
orifice button to the linkage bar and unscrew the
orifice button from the linkage bar.
Discharge Check Valve Removal and
Disassembly
(Figure 3)
Remove the discharge piping. Support the dis-
charge check valve assembly (7) using a sling and
a suitable lifting device. Remove the attaching
hardware (9, 10 and 11) and separate the dis-
charge check valve assembly and gasket (8) from
the pump assembly (1).
The flapper and cover O-ring are the only service-
able parts of the check valve. If the flapper requires
replacement, remove the hardware securing the
cover and O-ring. Separate the valve cover and re-
move the flapper.
Suction Head Removal
(Figure 4)
Remove the suction and discharge piping. Before
attempting to service the pump, remove the pump
casing drain plug (32) and drain the pump. Clean
and reinstall the drain plug.
Remove the nuts (34) and use the jacking screws
(39) to force the suction head (42) out of the pump
casing. Turn the screws evenly to prevent binding.
Remove the suction head gasket (44).
Inspect the wear ring (36) for excessive wear or
scoring. If replacement is required, use a small bit
to drill two holes horizontally, 180
_ apart, through
the wear ring. Use a chisel or other suitable tool to
complete the cuts through the wear ring. Use cau-
tion not to damage the suction head bore. Remove
the wear ring from the suction head.
Impeller Removal
(Figure 4)
Before attempting to remove the impeller (2), re-
move the pipe plug (27) and drain the seal cavity.
This will prevent the seal lubricant from spilling as
the impeller is removed.
To remove the impeller, secure the shaft from rotat-
ing by reaching through the discharge port and
tightly wedging a soft-metal bar between the vanes
of the impeller.
Remove the impeller nut and washer (37 and 38).
Install two 3/8−16 UNC by 3-inch long capscrews
(not supplied) in the tapped holes in the impeller
and use a suitable puller to remove the impeller
from the shaft. Use caution when removing the im-
peller; tension on the seal spring will be released
when the impeller is removed. Retain the impeller
key (40). Remove the metal bar from the impeller
vanes.
Remove the impeller adjusting shims (48). For
ease of reassembly, tie and tag the shims or mea-
sure and record their thickness.