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 TM 55-1905-220-14-10
5-35. BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL - TIMING BLOWER ROTORS
7. Blower
a. After the blower rotors and timing gears are in-
stalled, the blower rotors must be timed.
NOTE
Before timing the blower, install four 5/16 inch 18 x 1-7/8 inch bolts with
flatwashers through four bolt holes in each end plate (top and bottom) and thread
them into the blower housing. Tighten the bolts to 13-17 lb-ft (17.6 23.0 Nm)
torque. This will hold the end plates against the blower housing so the proper
clearance between the rotors and the end plate can be obtained.
b. The blower rotors, when properly positioned in the
housing, run with a slight clearance between the
lobes. This clearance may be varied by moving one
of the helical gears in or out on the shaft rela-
tive to the other gear.
c. If the right-hand helix gear is moved out, the
right-hand helix rotor will turn counterclockwise
when viewed from the gear end. If the left-hand
helix gear is moved out, the left-hand helix
rotor will turn clockwise when viewed from the
gear end. This positioning of the gear, to
obtain the proper clearance between the rotor
lobes, is know as blower timing.
d. Moving the gears OUT or IN on the rotor shafts is
accomplished by adding or removing shims between
the gears and the bearings.
e. The clearance between the rotor lobes may be
checked with 1/2 inch wide feeler gages in the
manner shown below. When measuring clearances
of more than .005 inch, laminated feeler gages
that are made up of .002 inch, .003 inch, or
.005 inch feeler stock are more practical and
suitable than a single feeler gage. Clearances
should be measured from both the inlet and out-
let sides of the blower.
5-588
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