OM-07323
PA SERIES
MAINTENANCE & REPAIR
PAGE E - 23
The shaft and impeller threads
must
be
completely clean before reinstalling the im
peller. Even the slightest amount of dirt on
the threads can cause the impeller to seize
to the shaft, making future removal difficult
or impossible without damage to the im
peller or shaft.
Apply a small amount of `Never‐Seez' or equivalent
anti‐lock compound on the shaft threads. Screw
the impeller onto the shaft until tight.
NOTE
At the slightest sign of binding,
immediately
back
the impeller off, and check the threads for dirt.
Do
not
try to force the impeller onto the shaft
.
A clearance of .025 to .040 inch (0,64 to 1,02 mm)
between the impeller and the seal plate is neces
sary for maximum pump efficiency. Measure this
clearance, and add or remove impeller adjusting
shims as required.
Pump Casing and Wear Plate Installation
(Figure 4)
If the wear plate (5) was removed, position the re
placement wear plate in the casing and secure it
with the hardware (3 and 4).
Lubricate the O‐rings (16 and 33) with light grease,
and install them in the grooves in the bearing hous
ing and seal plate. Use a suitable lifting device to
position the pump casing over the rotating assem
bly.
Be careful
not to damage the O‐rings.
Install the same thickness of adjusting shims (14)
as previously removed, and secure the rotating as
sembly to the pump casing with the hardware (12
and 13). Do not fully tighten the capscrews until the
impeller face clearance has been set.
A clearance of .010 to .020 inch (0,25 to 0,5 mm)
between the impeller and the wear plate is also rec
ommended for maximum pump efficiency. This
clearance can be obtained by adding or removing
an equal thickness of shims from each rotating as
sembly shim sets (14) until the impeller scrapes
against the wear plate when the shaft is turned. Af
ter the impeller scrapes, add approximately .010
inch (0,25 mm) of shims to each shim set.
After the face clearance has been set, tighten the
hardware securing the rotating assembly to the
pump casing.
Reinstall any leveling shims used under the pump
casing mounting feet and secure the casing (1) to
the base with the previously removed hardware.
Diaphragm Primer Reassembly
Refer to
MAINTENANCE AND REPAIR
, Section E
in the manual accompanying the diaphragm
primer for reassembly instructions.
Diaphragm Primer Installation
(Figures 3 and 5)
Pumps and related equipment must be
installed and operated according to all
national, local and industry standards.
Position the diaphragm primer assembly over the
mounting flange (9, Figure 5) with the threaded
holes lining up and the diaphragm primer crank
shaft facing the opposite direction of the priming
chamber assembly (2, Figure 3). Position the di
aphragm primer bushing (18, Figure 3) and
sprocket (19, Figure 3) on the crankshaft and in
stall the drive belt (20, Figure 3) over the sprocket.
Lift diaphragm primer (13, Figure 3) with a pry bar
or other tool while keeping the belt in the sprocket.
Place a mounting spacer (12, Figure 3) under each
corner. Install mounting hardware (8, 9 and 10, Fig
ure 3) in each of the four corners.
Drive Belts
When using drive belts, the power source and the
pump must be parallel. Use a straightedge along
the sides of the pulleys to ensure that the pulleys
are properly aligned (See Figure Below). In drive
systems using two or more belts, make certain that
the belts are a matched set; unmatched sets will
cause accelerated belt wear.
