3-3.3Adjustment. (Refer to figure 3-4)3-3.3.1Should it be necessary to adjust the pump due to excessive clearance of the impellers (4 & 5) between thefront and back of housing (3) due to normal wear, remove the back (7) plate and remove one, two, or three, etc. pumpgaskets (6) as may be required to take up the slack. Replace back plate, being extremely careful that the remaininggaskets do not crimp or wrinkle, and tighten bolts (14) diametrically opposed to each other, pulling each bolt up evenly.3-3.4Maintenance. (Refer to figure 3-4)3-3.4.1The pump is furnished with a high grade, braided type of asbestos packing (1 3), lubricated with graphite andimpregnated with lubricant. No further lubrication is needed for normal operation of this packing. When tightening thepacking nut (1) do not compress the packing too greatly and cause excessive binding on the shaft. When installingbronze or alloy bushings (9) in the pump, care must be taken to not "scar" the bushings. It is preferable to press thebushings in place rather than tap or hammer them. Bushings should be reamed for shaft clearance of .010 after they arepress 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 View3-5
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