Drive Chain Tension, Operator assembly

Installation

5.6 Drive Chain Tension

Figure 11 is a finished header assembly that has been installed. Also note the idler barrel has been bolted back into place back.

Chain tension should be checked after the door is cycled a few times.

The M&I drive chain is to be tensioned so the deflection of the slack (bottom side) of the chain is equal to 2% of the distance between the shafts. For door over 12’ x 12’ this value is 3/8” (9.5 mm). For doors under 12’ x 12’ this value is

9/32” (7.1 mm).

5.6.1 Operator assembly

The operator is not assembled to the door when it is shipped. On the drive side of the header assembly, 4 weld studs serve as attachment points for the operator. When assembling the operator, the slots on the operator mounting surface should be centered on the studs Tighten using the provided flat washers and nuts. Assemble the chain.

5.6.2 Chain Tension Adjustment

Figure 12a

If the Chain tension needs to be adjusted, you need to do the following:

Support the operator prior to loosening the operator mounting bolts.

Loosen the 4 bolts that attach the operator to the header assembly.

Either raise or lower the operator to achieve the proper tension.

Retighten the 4 bolts that attach the operator to the header assembly.

Figure 12b

RCA L

Version 2.0

RCA L specifications

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