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 TM 55-1905-219-14-11
5-71. .BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-ASSEMBLY
6. Blower
a. Several precautions are given below
to assure the proper assembly of
the rotors and gears for correct
blower tirming.
1. The lobes on the DRIVING blower
rotor and the teeth on the gear
form a right-hand helix while
the lobes and teeth of the
DRIVEN rotor and gear form a
left-hand helix. Hence, a
rotor with right-hand helix
lobes must be used with a gear
having right-hand helix teeth
and vice-versa.
2. One serration is omitted on the
drive end of each blower rotor
shaft and a corresponding ser-
ration is omitted in each gear.
Assemble the gears on the rotor
shafts with the serrations in
alignment.
3. The rotors must be assembled in
the blower housing with the
omitted serrations in the rotor
shafts aligned as shown in step
6f.
b
Blower end
1. Support the blower
Use new oil
plates (46
end plate, finished
seals and spacer
and 47),
surface facing up,
sleeves.
spacer
on wood blocks on
sleeves
the bed of an arbor
(55 and
press.
56), and
oil seals
(53 and
54)
5-990
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