Center Rotor in Pump Case
If pump turns hard:
1. Place short brass rod (or hardwood dowel) against end of shaft (Figure 14). Center rod on shaft (not on bearing). Tap
lightly with hammer. Try turning shaft again.
2. If this fails to center the rotor to where it can be turned freely, tap other end of shaft, protecting it as above. When the shaft
can be turned by hand, using wrench as above, it is not binding.
- 38 -
Repair Instructions - cont’d.
Assemble Rotor and Shaft to Endplate
1. Install the shaft rotor assembly by carefully pushing the short end of the shaft rotor assembly through the shaft seal into the
endplate. Place in the arbor press with the drive end of the shaft pointed down and press the assembly together (Figure
12). Leave just enough clearance between the rotor and endplate so that rotor can be turned by hand. If it turns too freely,
sand a little more off the body end that faces the endplate. You should notice a slight drag, but be able to turn shaft with an
adapter on it, by hand. The “slight drag” will wear off after the pump has been used a short time. Installing new rollers,
seals, bearings and shafts will not prove entirely satisfactory for volume and pressure unless end clearance is taken up.
ATTENTION: Before new parts are installed, all burrs should be removed, particularly in the rotor slots and body. Do not
machine clean the body casting. A more satisfactory job can be done by hand cleaning with an emery cloth.
2. Remove the assembled portion from the arbor press and invert it on the press table. Then place rollers in the roller slots as
close to center of rotor as possible. Place the pump body over rotor and shaft, and carefully ease the end of the shaft past
the lips of the seal in pump body (Figure 12). Slowly press the pump body down to fit the endplate (Figure 13).
3. Turn pump over; line up bolt holes and replace assembly bolts. Alternately and evenly tighten the bolts as shown
(Figure 13).
ATTENTION: After bolts have been tightened, check to see if rotor is centered in pump case. Try to turn the pump shaft, using a
crescent wrench on the shaft as a lever.
Figure 14
Figure 12
Figure 13
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