PA SERIES
OM-06622
MAINTENANCE & REPAIR
PAGE E - 24
is secured to the engine bellhousing, with
out pre‐loading the bearings.
With the flexible portion of the coupling and the
bushing properly positioned on the shaft, tighten
the two setscrews in an alternating sequence until
the bushing and coupling are fully secured. Torque
the setscrews to 14.6 ft. lbs. (175 in. lbs. or 2 m.
kg.).
If the complete coupling assembly is being re
placed, apply `Loctite Retaining Compound No.
242' or equivalent to the threads of the screws (6).
Install the screws and lock washers (5) and secure
the outer ring of the coupling to the engine flywheel
by torquing the screws to 45 ft. lbs. (540 in. lbs. or
6,2 m. kg.).
Using a suitable lifting device, position the as
sembled pump and coupling so the flexible portion
of the coupling seats inside the outer ring attached
to the engine flywheel.
NOTE
To ease installation,
lightly
lubricate the rubber por
tion of the coupling with a
non‐petroleum based
lubricant
such as vegetable oil or glycerin, or a sili
con‐based lubricant such as “WD40” or equivalent.
Do not
use petroleum‐based lubricants, or any oth
er substance which may soften or otherwise dam
age the rubber.
Install the intermediate guards (19, Figure 5) and
secure them with the hardware (29 and 30), Figure
5). Secure the intermediate to the engine bellhous
ing with the remaining hardware (7 and 8).
Priming Chamber Assembly And Installation
(Figure 7)
Clean and inspect the components of the priming
valve (1). Inspect the linkage and ensure the orifice
button (not shown) squarely engages the valve
seat. Replace the orifice button if required (see
Priming Chamber Removal and Disassembly
for orifice button removal).
If the orifice button was removed, screw the new
orifice button into the linkage bar until fully seated.
Align the hole in the linkage bar with the holes in the
bracket and reinstall the pivot pin. Secure the pivot
pin with the previously removed “e‐clip”.
Adjust the orifice button seating as necessary by
screwing the orifice button into or out of the linkage
bar. Proper adjustment is achieved when the ori
fice button fully seats against the orifice before the
linkage bar on the float bottoms against the
threads on the orifice button. When adjustment is
complete, install and tighten the lock washer and
hex nut securing the orifice button.
Install the strainer (6) and priming valve gasket (4).
Lower the float into the priming chamber (5) and
secure the priming valve with the previously re
moved hardware (2 and 3).
(Figure 6)
Install the baffle (9) and gasket (8) and use a sling
and suitable lifting device to position the priming
chamber assembly on the suction spool (5, Figure
4). Secure the priming chamber assembly with the
hardware (6 and 7).
Reconnect the suction piping to the hopper spool
and the air discharge tubing to the priming cham
ber assembly.
Discharge Check Valve Assembly And
Installation
(Figure 3)
The flapper and cover O‐ring are the only service
able parts of the check valve. If the flapper requires
replacement, remove the hardware securing the
cover and gasket. Separate the valve cap and re
place the flapper.
Install the cover O‐ring and secure the cover with
the previously removed hardware.
Apply a small amount of light grease to the gasket
(7) to hold it in place and position it against the
pump casing flange. Position the discharge check
valve assembly and secure it with the previously re
moved hardware (4, 5, 6 and 8).