PA SERIES PUMPS
MR--04835
MAINTENANCE & REPAIR
PAGE C -- 10
Impeller Removal
(Figure C--2)
Before attempting to remove the impeller (2), re-
move the pipe plug (32) 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 (42 and 43).
Install two 3/8---16 UNC by 3 inch long capscrews
in the tapped holes in the impeller and use a suit-
able puller to remove the impeller from the shaft.
Use caution when removing the impeller; tension
on the seal spring will be released when the impel-
ler is removed. Retain the impeller key (45). Re-
move the metal bar from the impeller vanes.
Remove the impeller adjusting shims (53). For
ease of reassembly, tie and tag the shims or mea-
sure and record their thickness.
Seal Removal and Disassembly
(Figure C--2)
Carefully remove the spring holder (52) and seal
spring. Slide the shaft sleeve (50) and rotating por-
tion of the seal assembly off the shaft as a unit.
Apply oil to the sleeve and work it up under the bel-
lows. Slide the rotating portion of the seal off the
sleeve.
Use a pair of stiff wires with hooked ends to remove
the stationary seat and O-ring from the pump cas-
ing bore.
NOTE
An alternate method of removing the stationary por-
tion of the seal is to remove the pump casing and
then press the seal components out of the pump
casing from the back side.
If no further disassembly is required, refer to
Seal
Reassembly And Installation
.
Pump Casing Removal
(Figure C--2)
Support the pump casing using a suitable hoist
and sling and remove the hardware securing the
casing to the base.
Remove the hardware (35 and 36) securing the
casing to the intermediate (14). Separate the parts
by pulling the casing straight away from the inter-
mediate. Remove any leveling shims from under
the casing feet. Tie and tag the shims for ease of
reassembly. Remove the casing gasket (5).
Inspect the balance ring (40) 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 pump casing.
NOTE
An alternate method of removing the balance ring is
to press the balance ring out of the pump casing
from the back side.
Separating Intermediate and Drive Assembly
From Engine
(Figure C--2)
To service the bearing (30) or drive components,
the intermediate must be separated from the en-
gine.
Support the intermediate using a suitable hoist and
sling and remove the hardware (12 and 13) secur-
ing the intermediate to the engine bellhousing.
Separate the assemblies by pulling the intermedi-
ate straight away from the engine.
As the assemblies separate, the flexible portion of
the coupling assembly (17) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
two allen head setscrews from the bushing (18).
Screw one of the setscrews into the puller hole on
the circumference of the bushing. As the coupling
and bushing separate, remove the bushing and
slide the coupling off the shaft. Remove the shaft
key (19).
It is not necessary to remove the outer ring of the
coupling from the engine flywheel unless the cou-
