PA SERIES
OM-06575
MAINTENANCE & REPAIR
PAGE E - 12
a wood block through the pump discharge and
into the impeller vanes. Remove the impeller screw
and washer (8). Remove the wood block from the
pump discharge.
Remove the hardware (13, 14 and 15, Figure 3) se
curing the pump casing and bottle oiler bracket to
the pedestal (20, Figure 3).
Pull the pump casing straight away from the ped
estal to prevent binding on the impeller. Remove
the casing gasket (6) and clean the contacting sur
faces.
Impeller Removal
(Figure 2)
Before removing the impeller, loosen the hose
clamp (10, Figure 3) and remove the hose (48, Fig
ure 3) from the lower connector (11, Figure 3). Re
move the bottle oiler and bracket assembly and
drain the seal cavity. This will prevent the oil in the
oiler from escaping when the impeller is removed.
With the impeller screw and washer removed as
described in
Pump Casing Removal
, insert a pair
of wedges 180
apart between the impeller and the
seal plate (40, Figure 3). Tap the wedges alternate
ly to force the impeller off the shaft. Retain the im
peller key (33, Figure 3).
Inspect the impeller wear ring for excessive wear or
scoring.
Proper replacement of the impeller wear
ring requires machining and dynamic bal
ancing the impeller assembly after the new
wear ring is welded to the impeller. Failure
to properly install the new wear ring and
machine and balance the impeller assem
bly can result in premature shaft, seal or
bearing failure, or other damage to the
pump.
To replace the wear ring, grind off the three weld
spots securing the wear ring to the impeller.
Use
caution
not to damage the impeller. Pry or carefully
grind the wear ring off the impeller.
Seal Removal
(Figures 2 and 6)
This pump is designed with two seals; a primary
mechanical seal (3) located directly behind the im
peller and a secondary oil seal (23, Figure 3) lo
cated in the seal plate cover (45, Figure 3). If the liq
uid being pumped leaks past the oil seal, both
seals should be replaced immediately.
Remove the impeller shims (42). Tie and tag the
shims for ease of reassembly. Remove the seal
spring. Slide the rotating portion of the seal (con
sisting of the shaft sleeve and O‐ring, bellows and
retainer, and rotating element) off the shaft as a
unit.
Apply oil to the sleeve and work it up under the rub
ber bellows. Slide the bellows and retainer off the
sleeve. Remove the sleeve O‐ring.
Remove the hardware (16 and 17) and slide the
seal plate and remaining seal components off the
shaft. Disengage the hardware (46 and 47, Figure
3) and separate the seal plate cover and O‐ring
(37, Figure 3) from the seal plate.
Use a suitably sized dowel to press the stationary
portion of the seal out of the seal plate. Press the oil
seal out of the seal plate cover.
If no further disassembly is required, refer to
Seal
Installation
.
Pedestal Assembly Removal
(Figure 3)
Disassembly of the pedestal requires separation of
the pump and driver.
Remove the hardware securing the pedestal to the
base. Use a suitable hoist and sling to remove the
pedestal assembly.
Shaft and Bearing Removal and Disassembly
(Figure 3)
When the pump is properly operated and main
tained, the pedestal should not require disassem
bly. Disassemble the shaft and bearings
only
when there is evidence of wear or damage.
Shaft and bearing disassembly in the field
