TM 5-3810-300-24&P-3
BLOWER 3.4
Fig. 11 - Typical Details and Relative Location of Parts - Standard and Small Diameter Rotor Six Cylinder 71 Blowers
2
Housing--Blower
14
Gear--Rotor--Lower--
22
Bolt--Plate to Hub
40
Coupling Assy.--
Water
3
Rotor--Blower--Upper--
L.H Helix
23
End Plate--Front
Pump Drive
R.H Helix
15
Bolt--Rotor Gear
24
End Plate--Rear
41
Bolt--Allen Head
4 Rotor--Blower--Lower--
16
Lock
Washer--Bolt to
25
Pin (Dowel)--
45
Plain Washer
L.H Helix
Rotor Gear
Housing to End Plate
46
Lock Washer
5 Bearing (Roller)--Front
17
Shim--Gear to Bearing
26
Bolt--End Plate
63
Bolt--Blower Mounting
6 Retainer--Bearing
(For Timing Rotors)
27
Oil Seal--End Plate
64
Plain Washer--Blower
7 Bolt--Bearing--Retainer
18
Disc--Fuel Pump
28
Cover--End Plate--Front
Mounting
8 Lock Washer
Coupling
29
Cover--End Plate--Rear
65 Gasket--Blower Housing
9 Bearing (Ball)--Rear
19
Washer--Rotor Gear
30
Bolt--End Plate Cover
115 Plate--Blower Rotor
Double Row Thrust
Retaining
31
Lock Washer
Drive Hub
13 Gear--Rotor--Upper--
20
Hub--Rotor Drive
32
Gasket--End Plate
116 Spacer--Plate to Gear
R.H Helix
21
Bolt--Plate to Gear
Cover
smooth for efficient operation of the blower. If the inside
replacement, both gears must be replaced as a set.
surface of the housing is slightly scored or burred, it may
be cleaned up with emery cloth.
Check the blower drive shaft serrations for wear or
peening. Replace the shaft if it is bent.
Check the finished ends of the blower housing, for
flatness and burrs. The end plates must set flat against
Inspect the blower drive coupling springs (pack) and the
the blower housing.
cam for wear.
The finished inside face of each end plate must be
Replace all worn or excessively damaged blower parts.
smooth and flat. If the finished face is slightly scored or
burred, it may be cleaned up with emery cloth.
Assemble Blower
Examine the serrations in the blower timing gears for
wear and peening; also check the teeth for wear,
The lobes on the upper blower rotor and the teeth on its
chipping or damage. If the gears are worn to the point
gear form a right-hand helix while the lobes and teeth of
where the backlash between the. gear teeth exceeds
the lower rotor and gear form a left- hand helix.
.004", or damaged sufficiently to require
Therefore, a rotor with right-hand helix
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