TM 9-3418-201-14&P
Figure 2
CARTRIDGE ASSEMBLY AND INSTALLATION
Figure 2 illustrates a typical cartridge assembly and
HEAD SCREW ADJUSTMENT
installation, when viewed from the head end. The
cartridge assembly procedure is the same for both single
Some pump cover heads and intermediate heads
and double pumps, depending on the direction of shaft
(double pumps) are provided with two small holes to
rotation.
match the two diameters of the locating pin. Install the
head so the pin fits the hole size to prevent the pin from
The stepped diameter locating pin prevents improper
bending or shearing when the pump is put into operation.
assembly of the cartridge. However, caution must be
exercised to install the cartridge properly for the direction
Pull the head down gradually, alternately tightening the
of rotation desired.
screws 1800 from each other until the head seats evenly
on the bushing. Turn the shaft by hand during the
process until a light, smooth snugness is felt through a
The large series pump cartridges have a locating screw
complete revolution. Do not over-tighten the screws,
and a retaining screw in lieu of the locating pin used in
causing the shaft to bind.
the small and intermediate series.
Before starting these pumps, check for freedom of
NOTE
movement of the internal parts by turning the shaft by
The direction of rotation (RH or LH) is
hand. Never start a pump which shows evidence of
always determined by viewing the pump
binding.
from the shaft end.
CAUTION
INSTALLATION
A new or overhauled pump must be started
Right hand rotation: Insert the small end of the locating
under load on the first run. This will create
pin into the small hole in the pump body at a 3
a back pressure to assure adequate
o' clock position.
internal lubrication. After a pump is broken
in, it can be started under
no-load
Left hand rotation: Insert the large end of the locating
conditions.
pin into the large hole in the pump body at a 6
o'clock position.
Start the pump by jogging the drive motor a few times to
be sure the pump is primed.
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