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 TM 55-1905-220-14-10
5-35. BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL - DISASSEMBLY (Cont)
j.
Examine the serrations in the blower timing gears for wear and
peening; also check the teeth for wear, chipping or damage.
If the gears are worn to the point where the backlash between
the gear teeth exceeds .004 inch, or damaged sufficiently to
require replacement, both gears must be replaced as a set.
k.
Check the blower drive shaft serrations for wear or peening.
Replace the shaft if it is bent.
l.
Inspect the blower drive coupling springs (pack) and the cam
for wear.
m. Replace all worn or excessively damaged blower parts.
n. Clean the oil strainer in the vertical oil passage at the bot-
tom of each blower end plate, and blow out all oil passages
with compressed air.
OVERHAUL - ASSEMBLY
6. Blower
a. Several precautions are given below to assure the
proper assembly of the rotors and gears for cor-
rect 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 serration
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 hous-
ing with the omitted serrations in the rotor
shafts aligned as shown in step 6f.
5-571
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