Gorman-Rupp Pumps PA12A60-B-6068H 1435345 and up - Manual (Page 39)

OM-06296 PA SERIES
MAINTENANCE & REPAIR PAGE E - 19
Priming Chamber Removal And Disassembly
(Figure 7)
Disconnect both the suction piping and the air dis­
charge tubing from the priming chamber assembly
(3). Support the priming chamber assembly using
a sling and a suitable lifting device. Disengage the
hardware (4 and 5) and separate the priming
chamber assembly, gasket (8) and baffle (7) from
the spool (8, Figure 4).
(Figure 8)
Remove the hardware (2 and 3) securing the prim­
ing chamber (1) to the priming chamber (6). Care­
fully lift the valve components from the priming
chamber. Remove the gasket (4) and clean the
mating surfaces.
If the priming chamber float is stuck or the strainer
(6) is clogged, it can usually be cleaned without fur­
ther disassembly.
The only serviceable part of the priming chamber is
the orifice button (not shown). If liquid continues to
bypass through the priming chamber after adjust­
ing the orifice button (see Priming Chamber
Reassembly and Installation for adjustment), the
button 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 pivot 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 4)
Support the discharge check valve assembly (5)
using a sling and a suitable lifting device. Remove
the hardware (3 and 4) and separate the discharge
check valve assembly and gasket (6) from the
pump assembly (1).
The flapper and cover gasket are the only service­
able parts of the check valve. If the flapper requires
replacement, remove the hardware securing the
cover. Separate the valve cap and remove the flap­
per and gasket.
Suction Head And Wear Ring Removal
(Figure 5)
Unless replacment of the spool gasket (6, Figure 4)
is required, the suction head (49) may be removed
without separating it from the spool. However, if the
spool gasket must be replaced, support the spool
with a suitable hoist and sling, remove the hard­
ware (3 and 4, Figure 4) and separate the suction
spool and gasket from the suction head.
Remove the hardware securing the suction head
(49) to the base. Support the suction head using a
suitable hoist and sling. Disengage the hardware
(14 and 15) and separate the suction head and
wear ring (51) from the pump casing. Remove the
suction head gasket (52) and clean the mating sur­
faces.
Inspect the wear ring for excessive wear or scoring.
The wear ring is a press fit into the suction head
and is additionally secured with the spiral pins (50).
If replacement is required, use a small bit to drill
three holes horizontally, 180
_ apart, through the
wear ring between each of the spiral pins. Use a
chisel or other suitable tool to complete the cuts
through the wear ring. Use caution not to damage
the suction head bore. Remove the wear ring sec­
tions from the suction head. Pull the spiral pins
from the suction head.
If no further disassembly is required, see Suction
Head and Wear Ring Installation.
Pump Casing Removal
(Figure 5)
Support the pump casing using a suitable hoist
and sling.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam­
age to equipment. If slings or chains are
used to move the pump or components,
make sure that the load is balanced;
otherwise serious personal injury or
death could result. Suction and dis­
charge hoses and piping must be re­
moved from the pump before lifting.