12
CAUTION
ATTENTION
If key (21) has a step, install key (21) with step facing up and away from back face of previous
stage.
CAUTION
ATTENTION
When key (21) is installed and pushed up toward drive end, there must be an
approximately.020" gap between it and face of previous stage. If not, be sure previous stage
is seated firmly up against face of last installed housing. If key (21) is still up against back
of previous stage housing, it should be removed and a small step filed in portion of key
(21) that sticks above shaft (6) keyway. This will prevent key (21) from touching face of
previous stage.
29. Install square housing pinion gear (19) on shaft (6). Pinion gear (19) should slide freely on shaft (6) and key
(21). If not, ensure key (21) is properly installed and shaft (6) and pinion (19) keyway are free of burrs.
Ensure pinion (19) is installed in stage from which it was removed and is facing direction from which it was
removed.
CAUTION
ATTENTION
If gears are installed in wrong housing, pump may not perform properly or may seize
during operation. This is because gears are matched to each housing individually and may
not have correct clearances if installed in another housing. If gears are installed facing wrong
direction, pump may not perform properly or may seize during operation. This is because
some gears have chamfers on only one side. These chamfers must be positioned facing
inside of housing so that there will be no interference with housing radii.
30. Install ring gear (20) in last stage square gear housing (7). Ensure ring gear (20) is installed in stage from
which it was removed and is facing direction from which it was removed.
CAUTION
ATTENTION
If gears are installed in wrong housing, pump may not perform properly or may seize during
operation. This is because gears are matched to each housing individually and may not have
correct clearances if installed in another housing. If gears are installed facing wrong direction,
pump may not perform properly or may seize during operation. This is because some gears
have chamfers on only one side. These chamfers must be positioned facing inside of housing
so that there will be no interference with housing radii.
31. Install O-ring (10) on last stage gear housing (7).
32. Install dowel pin (22) in last stage gear housing (7).
33. Install last stage square gear housing (7), with installed ring gear (20), onto shaft (6). Ensure dowel pin (22)
engages dowel pin hole in back face of previous stage round housing (14) and pinion gear (19) installed on shaft (6)
is properly positioned to enter gear housing (7).
34. Install washers (18) on capscrews (17) with chamfer on washers (18) facing head of capscrews (17). (Single
stage units do not have washers (18)). Install capscrews (17), with washers (18) installed, and tighten
with torque
wrench
to torque values on assembly drawing. Torque one-half value for all capscrews first, then torque to full
specified torque value. Capscrew tightening pattern should be across opposite corners for both half torque and
full torque tightening.
CAUTION
ATTENTION
With capscrews (17) torqued to full value, pump shaft must turn freely by hand and without
significant internal snagging. Otherwise, unit has not been properly assembled.
35.
Install O-ring (35) into cover (15). If necessary, use grease to hold O-ring (35) in place.
36.
Install end cover (15) on square gear housing (7) using capscrews (38). Tighten capscrews (38)
with torque
wrench
to torque values on assembly drawing.
