HD-98 Door Operator with OST Mechanical Installation and Adjustment
Printed in USA November, 2011
11
Setting the Stroke Notes:
• The two cap screws securing the intermediate arm to the pivot arm should be loose when set-
ting the stroke.
• Fully Open Position - The point where the doors are flush with or slightly recessed behind the
open door jamb.
• Fully Closed Position - The point where the leading edge of the door contacts the door jamb, or
in the case of center opening doors, the point where the two leading edges of the doors con-
tact.
1. Place the doors in the Fully Open Position.
2. Measure the distance from B to C and record this measurement as Door Open (DO). See
Figure 4.
3. Place the doors in the Fully Closed Position.
4. Measure the distance from B to C and record this measurement as Door Closed (DC).
See Figure 4.
5. Calculate the stroke using the following formula:
6. Loosen the two cap screws in the adjustable arm.
7. Move the adjustable arm in the circular slot of the drive wheel so that the distance from A to B
is equal to the calculated stroke length. See Figure 4.
8. Tighten the two cap screws in the adjustable arm.
Figure 4 - Door Operator Stroke
B
C
B
C
B
A
Door
Open
Door
Close
Stroke
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