TM 5-3895-374-24-1GP322FFBLOWER HUB LOCKING MECHANISMFig. 2There are three setscrews, positioned 120° apart, that are used to secure the impeller to the shaft by means of the blowerhub locking mechanism One of the three setscrews is located over the key. The procedure below should be followedclosely to properly secure the Impeller:1.Remove the three hex socket head setscrews and liberally apply Locktite 271.2.Replace the setscrews loosely and slide the impeller back and forth on the shaft until the impeller is positionedat the midpoint of its travel range.3.Snug either setscrew that is notover the key Then snug the second setscrew that is notover the key.4.Snug the setscrew that isover the key.5.Torque the twosetscrews notover the key to 516 Inch pounds (43 feet pounds).6.Torque the setscrew over the key to 400 Inch pounds (33 feet pounds).IMPORTANTBEFORE STARTING THE BLOWER FOR THE FIRST TIME, the impeller should be rotatedto be sure there are no restrictions to Its free turning. OPERATE THE BLOWER FOR 15MINUTES, then recheck the setscrews AFTER ONE WEEK OF OPERATION, recheck thesetscrews and retorque if necessary. Thereafter, periodically check the setscrews.(page 3-553)
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