OM-07323
PA SERIES
MAINTENANCE & REPAIR
PAGE E - 17
Use a pry bar to raise the diaphragm primer (13,
Figure 3) enough to remove the mounting spacers
(12, Figure 3). Lower the diaphragm primer and re
move the belt (20, Figure 3) from the pulley (19, Fig
ure 3). Remove the diaphragm primer and move it
to a clean, well‐equipped work area for further dis
assembly.
The bushing (18, Figure 3) and sprocket (19, Fig
ure 3) can be removed from the diaphragm primer
crankshaft by disengaging the set screws on the
front of the bushing. With the set screws removed,
the two components should loosen to the point of
moveable. Use caution not to damage the crank
shaft if it is necessary to tap the components off the
shaft with a rubber mallet.
Diaphragm Primer Disassembly
Refer to
MAINTENANCE AND REPAIR
, Section E
in the manual accompanying the diaphragm
primer for disassembly instructions.
Separating Pump and Drive Assembly From
Engine
(Figure 8)
Support the pump end using a hoist and sling, and
remove the hardware (not shown) securing the
pump casing to the base.
Remove the hardware (7 and 8) securing the bear
ing housing (4, Figure 5) to the engine bellhousing.
Remove the intermediate guards (25, Figure 5)
and separate the assemblies by pulling the inter
mediate straight away from the engine.
As the assemblies separate, the flexible portion of
the coupling assembly (1) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
two allen head setscrews from the bushing (2).
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 (3).
It is not necessary to remove the outer ring of the
coupling from the engine flywheel unless the cou
pling must be replaced. To remove the ring, disen
gage the hardware (5 and 6) securing it to the fly
wheel.
Remove any leveling shims used under the casing
mounting feet. Tie and tag the shims for ease of
reassembly.
Move the pump end to a clean, well equipped shop
area for further disassembly.
Draining Oil From Seal Cavity
(Figures 4 and 5)
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
pump casing is removed.
Position a
clean
container under the seal cavity
drain plugs (7, Figure 4 and 24, Figure 5). Remove
the plugs and drain the oil from the seal cavity into
the container. For shorter drain time, remove the
vented plug (5, Figure 5). Clean and reinstall the
drain plugs and vent plug. Inspect the oil for water,
dirt or a cloudy condition which could indicate seal
failure.
Loosening Impeller
(Figure 5)
With the pump end separated from the engine,
wedge a block of wood between the vanes of the
impeller (1) and the pump casing (1, Figure 4) to
prevent rotation.
Install the shaft key (30) in the shaft keyway. Install
a lathe dog on the drive end of the shaft (10) with
the “V” notch positioned over the shaft key.
With the impeller rotation still blocked, see Figure 9
and use a long piece of heavy bar stock to pry
against the arm of the lathe dog in a counterclock
wise direction (when facing the drive end of the
shaft).
Use caution
not to damage the shaft or key
way. When the impeller breaks loose, remove the
lathe dog, key and wood block.
