5
U.S. Gear
07/17
6. When the operator assembly is attached to the door bracket, be sure the door driven sprocket is
properly aligned with the operator drive sprocket before securing the driven sprocket to the shaft.
7. The shelf or bracket must provide adequate support for the operator. Prevent play between the
operator and the door shaft. The operator must be securely attached with the drive shaft parallel to
the door shaft. It may be necessary to field brace the operator/bracket.
Incorrect
Correct
Door
Sprocket
Operator
Output
Sprocket
Illustrations only, consult door manufacturer for install details.
DRIVE CHAIN ADJUSTMENT
NOTE: Use correct type, size and proper length of roller chain.
1. Adjust the drive chain by tilting or move the operator so that there is about 1/4” of slack when the
chain is depressed.
Note: The set screw included in the operator may be used for adjustment. (See figure - T1 and T2).
2. Once the drive chain has been tightened and the base leg screws have been set, and then tighten
the operator screws.
Drive Chain
Door Sprocket
Drive Sprocket
1/4"
T1
T2
Drive Chain
Door Sprocket
Drive Sprocket
1/4"
T1
T2
Summary of Contents for SDC-7545
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