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 TM 55-1905-219-14-10
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 installed, 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 h using, run with a slight
o
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 betweenhe rotor
t
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.
5-580
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