3-3.3
Adjustment. (Refer to figure 3-4)
3-3.3.1
Should it be necessary to adjust the pump due to excessive clearance of the impellers (4 & 5) between the
front and back of housing (3) due to normal wear, remove the back (7) plate and remove one, two, or three, etc. pump
gaskets (6) as may be required to take up the slack. Replace back plate, being extremely careful that the remaining
gaskets do not crimp or wrinkle, and tighten bolts (14) diametrically opposed to each other, pulling each bolt up evenly.
3-3.4
Maintenance. (Refer to figure 3-4)
3-3.4.1
The pump is furnished with a high grade, braided type of asbestos packing (1 3), lubricated with graphite and
impregnated with lubricant. No further lubrication is needed for normal operation of this packing. When tightening the
packing nut (1) do not compress the packing too greatly and cause excessive binding on the shaft. When installing
bronze or alloy bushings (9) in the pump, care must be taken to not "scar" the bushings. It is preferable to press the
bushings in place rather than tap or hammer them. Bushings should be reamed for shaft clearance of .010 after they are
press fit into the end plates (2 & 7).
When replacing pump gears (4 & 5), the gears come with shafts installed.
Figure 3-4. Water Pump, Exploded View
3-5
