TM-9-2540-207-14&P Sustainment Manual for A20 Heater for M113 2540-01-396-2826 Download
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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.