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37- 1- 613 Page 41
INLET CAVITY
BEARING SPACER
INLET CAVITY
ROTOR SHAFT SEAL
ROTOR SHAFT SEAL
FIGURE 7- 1
FIGURE 7- 2
with the grooved end toward the rotor. Make sure
there are no burrs on either end of the spacer or
end of the rotor. Place tape around the shaft to
prevent the spacer from sliding off as shown in
FIGURE 7 - 4.
3.
Place .030
” thick aluminum shim (17) on the bear-
ing carrier. The pointed section of the shim is posi-
tioned on the machined surface of the carrier to
match the contour of the housing (1). Lower the
housing, as level as possible, onto the carrier with
the discharge opening up (FIGURE 7-3), and the
in- let opening matching the cavity side
(Figure 7-1, page38), of the carrier. Engage the
dowel pins (36) with matching holes in the carrier
with care.
Tighten the carrier to housing screws (40, 43)
evenly so the dowel pins will not be damaged.
4.
Be sure the ends of the rotors and machined face
of the carrier are free of burrs and dirt. Lower the
gate rotor (3) into the housing (1) first
(Figure 7-4). The gear end shaft extension,
with the bearing spacer installed in Step 2,
goes down. Rotors must be suspended plumb
when lowering so the shaft extension and
bearing spacer can be carefully guided through
the close fit of the shaft seal without damage to
the babbit of the air seal. On older models, match
timing marks on the end of the rotor lobes as
shown inFigure7-9, page 40. Rotors must be used
in matched pairs. Identifying
DISCHARGE OPENING
DOWEL PIN
MAIN ROTOR
GATE ROTOR
TAPE
TIMING MARKS
FIGURE 7- 3
FIGURE 7- 4