MR--04836
PA SERIES PUMPS
MAINTENANCE & REPAIR
PAGE C -- 9
Use
only
replacement parts provided or
approved by Gorman-Rupp. Use of non-
authorized parts may result in damage to
the equipment and/or injury to personnel
and
will
invalidate the warranty.
Priming Chamber Removal And Disassembly
(Figure C--1)
Disconnect both the suction piping and the air dis-
charge tubing from the priming chamber assembly
(9). Support the priming chamber assembly using
a sling and a suitable lifting device. Remove the
hardware (4) and separate the priming chamber
assembly and gasket (2) from the pump assembly
(1).
(Figure C--3)
Remove the capscrews (not shown) securing the
priming chamber lid (1) to the priming chamber
(18). Carefully lift the lid and valve components
from the priming chamber. If the priming valve float
(17) is stuck or the check valve assembly (26) is
clogged, they can usually be cleaned without fur-
ther disassembly.
Inspect the gasket strip (8) and, if replacement is
required, remove the gasket and
all
of the old
adhesive.
To remove the float (17), disconnect the hardware
(11 and 12).
To replace the valve strap (25), disengage the
hardware (20, 21 and 22) and separate the guide
plate (19), clamp plate (24) and valve protector (34)
from the valve strap. Disengage the hardware (9
and 10) and remove the valve strap.
To remove the check valve assembly (26), disen-
gage the hardware (3 and 4). Remove the check
valve assembly, gasket (6) and valve neck (2).
Inspect the check valve components. If the check
valve (27) requires replacement, remove the hard-
ware (28, 29, 31 and 33) securing the valve weights
(30 and 32) to the check valve.
Discharge Check Valve Removal and
Disassembly
(Figure C--1)
Support the discharge check valve assembly (5)
using a sling and a suitable lifting device. Remove
the hardware (6 and 7) and separate the discharge
check valve assembly and gasket (8) from the
pump assembly (1).
The flapper and gasket are the only serviceable
parts of the check valve. If the flapper requires re-
placement, remove the hardware securing the
cover and gasket. Separate the valve cap and re-
move the flapper.
Suction Cover Removal
(Figure C--2)
Remove the suction and discharge piping. Before
attempting to service the pump, remove the pump
casing drain plug (39) and drain the pump. Clean
and reinstall the drain plug.
Remove the nuts (42) and use the jacking screws
(48) to force the suction cover (43) out of the pump
casing. Turn the screws evenly to prevent binding.
Remove the suction cover gasket (40).
Inspect the wear ring (44) 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 cover bore. Re-
move the wear ring from the suction cover.
Impeller Removal
(Figure C--2)
Before attempting to remove the impeller (2), re-
move the pipe plug (34) 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 fillister head screw (45) and impeller
nut (47). Install two 3/8---16 UNC by 3 inch long
