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FIGURE 7- 27
FIGURE 7- 28
29.
FINDING SMALLEST PLUS READING
--
FIGURE 7 - 30. Hold the gear under
counterclock- wise pressure to take up all slack,
and rotate the rotor clockwise
two complete
revolutions
with a wrench. Note the place of the
smallest plus reading, and continue rotation until
the smallest reading is again reached and stop.
This is the point of minimum interlobe clearance.
30.
SETTING THE INTERLOBE CLEARANCE
--
FIGURE 7 - 31. The interlobe clearance is
divided with 2/3 on the discharge side and 1/3
on the suction side. Hold the gear from turning.
Move the shaft counterclockwise with a wrench
just
enough to obtain 2 /3 of the indicator reading
obtained in Step 28.
EXAMPLE: The minimum plus reading in Step 29
is +.018; move the rotor until the indicator reads
+.012. This divides the interlobe clearance with
2/3 on the discharge side and 1/3 on the suction
side.
31. Hold the gear and shaft from turning and evenly
tighten four gear to hub
“Nylok” screws (41)
(FIGURE 7-32). Be sure the indicator reading
does not change while tightening the screws.
HOLD
HOLD
FIGURE 7- 29
FIGURE 7- 30