TM-9-2540-207-14-P
HEATER, VEHICULAR COMPARTMENT, MODEL: A20
TECHNICAL MANUAL; OPERATOR, FIELD, AND SUSTAINMENT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2007
TM-9-2540-207-14-P - Page 75 of 288
TM 9-2540-207-14&P
5-31
Vent Fan Impeller Assembly (Continued)
5.6.4.2 Installation
Note: When REPLACING the Vent Fan Impeller, a NEW Vent Fan Motor
MUST also be installed (ref. 5.6.6).
Do NOT reuse Vent Fan Impeller.
1.
Position the Impeller onto the motor shaft taking care not to damage the threads on the
end of the shaft.
Note:
The motor shaft is “D” shaped, so the Impeller will only go on when
the shaft and the Impeller are aligned.
2.
Using a feeler gauge, check that the gap between the back face of the rim of the Vent
Fan Impeller (large end) and the Vent Fan Housing is not less than 0.015" or more than
0.030". Re-shim as required.
3.
While holding the Impeller to stop it from rotating, use a 5/16" socket to secure the NEW
lock nut.
Figure 5.6-15 Detail, Vent Fan Impeller Assembly
1.
Check that the Vent Fan Impeller spins freely.
2.
Install Vent Fan Shroud (ref. 5.6.3).
3.
Install Vent Fan Assembly to the heater (ref. 5.6.1).
Vent Fan Assembly PC Board
for Design Iterations 1 & 2
shown. PC Board for Design
Iteration 3 will be different.
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