Mechanical Installation and Adjustment
HD-98 Door Operator with OST
12
Vertical Express
Adjusting the Drive Arms
See Figure 5 on page 13 for all steps in this procedure.
1. Place the doors in the Fully Open Position.
2. Slide the pivot arm to the end of the slot in the intermediate arm so that the hole in the bearing
is exposed.
3. Attach the pivot arm to the intermediate arm through the bearing with a 3/8" (10mm) flathead
socket cap screw.
Note:
Ensure that the spacer plate is between the two arms, the bearing spacer is installed, and
that the doors are still in the Fully Open Position.
4. Align the drive arm and connecting arm in a straight line. Vice grips may be used to hold these
two arms in alignment.
5. Maintain the doors in Fully Open Position, and rotate the drive wheel until all three points A, B,
and C are in a straight line.
6. Tighten the two cap screws attaching the pivot arm to the intermediate arm.
7. Use a pencil to trace a line along both sides of the adjustable arm on the drive wheel.
Note:
This will be the reference mark in the event that the stroke requires further adjustment.
8. Remove the vice grips and move the doors to the Fully Closed Position.
Note:
If the doors will not fully close: loosen the two cap screws in the adjustable arm, and
reposition the arm toward the outside of the drive wheel in small increments of 1/8"
(3mm).
9. Measure the distance from the top of the intermediate arm to the center of the drive wheel. The
correct distance for this measurement is 1/2" (13mm) to 1 1/2" (38mm). Ensure that the doors
can be opened from the inside per local code. The smaller this diameter, the more difficult it will
be to pull the car doors open manually.
If the measurement is correct - Securely tighten the cap screws in the adjustable arm and the
cap screws connecting the intermediate arm to the pivot arm. Proceed to
Setting the Mechani-
cal Stops
.
If the measurement is less than 1/2" (13mm) - Loosen the two cap screws in the adjustable
arm. Reposition the arm toward the outside of the drive wheel and tighten the two cap screws.
If the measurement is more than 1 1/2" (38mm) - Loosen the two cap screws in the adjustable
arm. Reposition toward the center of the drive wheel and tighten the two cap screws.
a. Move the doors to the Fully Open Position, and check the alignment of the connecting arm
and the three points A, B, and C.
b. Move the doors to the Fully Closed Position, and measure the distance from the top of the
intermediate arm to the center of the drive wheel.
c. If these measurements are not correct, repeat the adjustment of the arm until the correct
operation and measurement is obtained.
Note:
Once the stroke has been properly adjusted, check to ensure that the two cap screws in
the adjustable arm and the two cap screws holding the pivot arm to the intermediate arm
are securely tightened.
