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 TM 55-1905-220-14-10
5-8. BLOWER-MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-ASSEMBLY
8. Blower
NOTE
Several precautions are given below to assure the proper assembly
of the rotors and gears for correct blower timing.
1. The lobes on the driving blower
rotor and the teeth on its 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 serra-
tion 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 f below.
a. Blower
1. Support the blower
Use new oil
end plates
end plate, finished
seals.
(57 and
surface facing up, on
58), and
wood blocks on the bed
oil seals
of an arbor press.
(64 and 65)
5-236
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