BLOWER HUB LOCKING MECHANISM
There are three setscrews, positioned 120° apart, that are used to secure the impeller to the shaft by means of the blower
hub locking mechanism One of the three setscrews is located over the key. The procedure below should be followed
closely to properly secure the Impeller:
Remove the three hex socket head setscrews and liberally apply Locktite 271.
Replace the setscrews loosely and slide the impeller back and forth on the shaft until the impeller is positioned
at the midpoint of its travel range.
Snug either setscrew that is not over the key Then snug the second setscrew that is not over the key.
Snug the setscrew that is over the key.
Torque the two setscrews not over the key to 516 Inch pounds (43 feet pounds).
Torque the setscrew over the key to 400 Inch pounds (33 feet pounds).
BEFORE STARTING THE BLOWER FOR THE FIRST TIME, the impeller should be rotated
to be sure there are no restrictions to Its free turning. OPERATE THE BLOWER FOR 15
MINUTES, then recheck the setscrews AFTER ONE WEEK OF OPERATION, recheck the
setscrews and retorque if necessary. Thereafter, periodically check the setscrews.