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TM 9-2320-364-34-4
21-16
21-2. BLOWER ASSEMBLY REPAIR (CONT).
NOTE
Slotted screw from tach drive
goes on left hand gear.
(32)
Lubricate threads of screws (26) and (27)
with lubricating oil.
(33)
Install two timing gear washers (28) and
screws (26) and (27) on rotor shafts (7).
(34)
Place clean cloth in blower housing (9).
(35)
Tighten both timing gear screws (26) and
(27) evenly to draw both timing gears (24)
and (25) tight to rear end plate (12).
(36)
Tighten timing gear screws (26) and (27)
100 to 110 lb-ft (135 to 149 N.m).
NOTE
Screws should be 5/16-18 by 1 7/8 in.
(37)
Install four washers (28) and screws (29) in front end plate (6) and four washers (28) and screws (29) in
rear end plate (12). Tighten screws (29) 156 to 204 lb-in (18 to 23 N.m).
NOTE
Feeler gage is inserted between end plates and end of rotors. This must be performed at
ends of each lobe, making 12 measurements in all.
If proper clearance cannot be obtained at points (A) and (B), replace blower.
(38)
Check clearances at points A and B, between lobes of rotors (30) and (31) and end plates (6) and (12).
Each rotor lobe must be checked. Minimum clearance at point A is 0.007 in. (0.178 mm). Minimum
clearance at point B is 0.019 in. (0.482 mm).
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