OM-06575
PA SERIES
MAINTENANCE & REPAIR
PAGE E - 11
a sling and a suitable lifting device. Remove the
hardware (21 and 22) and separate the priming
chamber assembly, baffle (18) and gasket (19)
from the pump assembly.
(Figure 4)
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 lock washer securing the
orifice button to the linkage bar and unscrew the
orifice button from the linkage bar.
Discharge Check Valve Removal and
Disassembly
(Figure 1)
Support the discharge check valve assembly (10)
using a sling and a suitable lifting device. Remove
the hardware (7, 8 and 9) and separate the dis
charge check valve assembly and gasket (3) 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. Separate the valve cap and remove the flap
per and gasket.
Suction Head And Wear Ring Removal
(Figure 2)
Unless replacement of the spool gasket (3, Figure
1) is required, the suction head (49) may be re
moved without separating it from the spool. How
ever, if the spool gasket must be replaced, support
the spool with a suitable hoist and sling, remove
the hardware (8 and 9, Figure 1) 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 2)
Support the pump casing using a suitable hoist
and sling.
NOTE
When removing the pump casing, use a wire to se
cure the assembled bottle oiler (54, Figure 3) and
bracket (12, Figure 3) above the level of the oil in the
seal cavity. This will prevent oil from leaking out of
the oiler during disassembly.
If the impeller (2) is to be removed, the impeller
screw (7) should be loosened before removing the
pump casing. Immobilize the impeller by inserting
