MR−05861
PA SERIES PUMPS
MAINTENANCE & REPAIR
PAGE C − 11
death could result. Suction and dis-
charge hoses and piping must be re-
moved from the pump before lifting.
Remove the hardware (not shown) securing the
pump casing to the base.
NOTE
Unless impeller or seal replacement is required, it
is not necessary to drain the oil from the bottle oiler
(35) or seal cavity when removing the pump casing.
Remove the nuts (8) securing the pump casing
and bracket assembly (36) to the intermediate.
Loop a piece of wire through one of the holes in the
support and around the seal cavity air vent (33) to
support the sight gauge assembly while removing
the pump casing.
Pull the pump casing straight away from the inter-
mediate to prevent binding on the impeller. Re-
move the casing gasket (6) and clean the contact-
ing surfaces.
Inspect the wear plate assembly (28) for excessive
wear or scoring. If replacement is required, remove
the hardware (29 and 30) and pull the wear plate
out of the volute casing.
Draining Oil From Seal Cavity
(Figure C−2)
If any further disassembly is to be performed on the
pump, the seal oil cavity must be drained to pre-
vent the oil in the seal cavity from escaping as the
impeller is removed.
Lower the bottle oiler (35) below the seal cavity
drain plug (45) to prevent the oil in the bottle oiler
from being released as the seal cavity is drained.
Position a
clean
container under the seal cavity
drain plug. Remove the plug and drain the oil from
the seal cavity into the container. Clean and rein-
stall the drain plug. Inspect the oil for water, dirt or a
cloudy condition which could indicate seal failure.
With the bottle oiler below the level of the drain
plug, loosen the lower hose clamp (39) and pull the
hose (38) off the connector (37) at the tee (44). Plug
the end of the hose and rest the bottle oiler in a ver-
tical position to prevent the oil from spilling.
Impeller Removal
(Figure C−2)
To remove the impeller (2), tap the vanes in coun-
terclockwise direction (when facing the impeller)
with a block of wood or soft-faced mallet.
Be care-
ful
not to damage the impeller. When the impeller
breaks loose, unscrew it from the shaft. Use cau-
tion when removing the impeller; tension on the
shaft seal spring will be released as the impeller is
unscrewed. Inspect the impeller and replace it if
cracked or badly worn.
Seal Removal
(Figures C−2 and C−6)
This pump is designed with two seals; a primary
mechanical seal (4) located directly behind the im-
peller and a secondary oil seal (23) located at the
back of the seal plate (27). If the liquid being
pumped leaks past the oil seal, both seals should
be replaced immediately.
Slide the impeller adjusting shims (5) off the impel-
ler shaft (20). Tie and tag the shims or measure and
record their thickness for ease of reassembly.
Remove the seal spring. Slide the shaft sleeve (46)
and rotating portion of the seal (consisting of the
bellows, retainer, and rotating element) off the
shaft as a unit.
Remove the rotating element. Apply oil to the
sleeve and work it up under the rubber bellows.
Slide the bellows and retainer off the sleeve.
Carefully slide the seal plate and stationary portion
of the seal off the shaft as a unit. Remove the ma-
chine screws (25) and pull the seal plate cover (24)
and oil seal (23) out of the seal plate as a unit. Use a
suitable sized dowel to press the stationary portion
of the seal out of the seal plate from the back side.
Inspect the oil seal and, if replacement is required,
press it from the seal plate cover. Remove the O-
ring (26) from the seal plate cover.
If no further disassembly is required, refer to
Seal
Installation
.
