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 TM 55-1905-220-14-11
5-71. BLOWER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-TIMING BLOWER ROTORS
7. Blower
a. After the blower rotors and timing
gears are installed, the blower
rotors must be timed.
NOTE
Before timing the blower, install four 5/16"-18x1-7/8"
bolts with flat washers 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
relative to the other gear.
c.
If the right-hand helix gear is
moved out, the right-hand helix
rotor will turn counter-clockwise
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 known
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.
5-1008
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