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TM 55-1905-220-14-10
5-8. BLOWER-MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL -TIMING BLOWER ROTORS (Cont)
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 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.
e. The clearance between the rotor
lobes may be checked with 1/2" wide
feeler gages in the manner shown
below. When measuring clearances of
more than .005", laminated feeler
gages that are made up of .002",
.003" or .005" feeler stock are more
practical and suitable than a single
feeler gage. Clearances should be
measured from both the inlet and
outlet sides of the blower.
5-252


 


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