PA SERIES
OM-07323
MAINTENANCE & REPAIR
PAGE E - 18
Turn
Counterclockwise
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 9. Loosening Impeller
Pump Casing and Wear Plate Removal
(Figure 4)
Support the pump casing using a suitable hoist
and sling.
NOTE
Drain the oil from the seal cavity before removing
the pump casing. See
Draining Oil From Seal Cav
ity
.
Remove the hardware (12 and 13) securing the
pump casing (1) to the rotating assembly (2). Pull
the pump casing straight away from the rotating
assembly to prevent binding on the impeller. Re
move the shims (14). Tie and tag the shims or
measure and record their thickness for ease of rea
ssembly.
Inspect the wear plate (5) for excessive wear or
scoring. If replacement is required, remove the
hardware (3 and 4) and pull the wear plate out of
the pump casing.
Impeller Removal
(Figure 5)
With the rotating assembly removed from the
pump casing, unscrew the impeller (1) from the
shaft (10). Use caution when unscrewing the im
peller; tension on the shaft seal spring will be re
leased as the impeller is removed. Inspect the im
peller and replace if cracked or badly worn.
Remove the impeller adjusting shims (28); tie and
tag the shims, or measure and record their thick
ness for ease of reassembly.
Seal Removal
(Figures 5 and 10)
Slide the integral shaft sleeve and rotating portion
of the seal off the shaft as a unit.
Use a pair of stiff wires with hooked ends to remove
the stationary element and seat from the seal plate
(20).
An alternate method of removing the stationary
seal components is to remove the hardware (18
and 19) and separate the seal plate from the bear
ing housing (4). Position the seal plate on a flat sur
face with the impeller side down. Use a wooden
dowel or other suitable tool to press on the back
side of the stationary seat until the seat, O‐rings,
and stationary element can be removed.
Remove the shaft sleeve O‐ring (27) and seal plate
O‐ring (35).
If no further disassembly is required, refer to
Seal
Installation
.
Shaft and Bearing Removal and Disassembly
(Figure 5)
When the pump is properly operated and main
tained, the bearing housing should not require dis
assembly. Disassemble the shaft and bearings
only
when there is evidence of wear or damage.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly
equipped shop by qualified personnel.
Remove the bearing housing drain plug (24) and
drain the lubricant. Clean and reinstall the drain
plug.
