HD-98 Door Operator with OST Overview
Printed in USA November, 2011
7
Overview
The following is a list of the major components of a door operator including a description of
their functions, an overview of some of the critical adjustments, and maintenance information.
See Figure 1 on page 8.
• Adjustable Arm - The arm mounted to the drive wheel is used to change the amount
of linear door movement or stroke.
• Connecting Arm - Connects the drive arm to the door panel.
• Door Operator Support - A metal plate welded to the header. The door operator is
mounted to the door operator support with four bolts through the four mounting slots of
the door operator.
• Drive Arm - The linkage connected between the drive arm support and the connecting
arm.
• Drive Arm Support - The bracket containing two holes is located on top of the door
operator. The drive arm should be connected to the right-hand hole, looking from the
hatch, at the front of the door operator.
• Drive Wheel - A metal sheave containing a slotted cam surface. The adjustable arm
mounts to the drive wheel and is adjusted in the slotted cam surface. The drive wheel is
driven by the jack shaft sheave using 3 V belts.
To change the linear door travel or stroke, move the adjustable arm:
• Closer to the center of the drive wheel = less door travel for the same amount of wheel
rotation.
• Further from the center of the drive wheel = more door travel for the same amount of
wheel rotation.
• Idler Arm - An adjustable arm mounted to the front of the door operator which controls the
tension of the 3 V belts between the jack shaft sheave and the drive wheel.
• Intermediate Arm - Adjustable linkage connected between the drive wheel adjustable arm
and the pivot arm. The connection at the pivot arm is adjustable to control the length of the
intermediate arm.
• Mechanical Stops - Metal L brackets mounted to the front of the door operator. The stops
have slots to adjust the amount of drive wheel rotation and, once positioned, they limit the
physical rotation of the drive wheel.
• Motor - 115V or 230V DC Motor
• Pivot Arm - Connects the drive arm to the intermediate arm and provides an adjustment
for the length of the intermediate arm.
• Sheave, Jack Shaft - A spoked sheave driven by the door operator motor with a single
V belt. The motor sheave drives the jack shaft sheave which drives the drive wheel.
• Sheave, Motor - A sheave attached directly to the door operator motor shaft.
• Support Strut - Unistrut legs on the rear of the door operator which are used to secure the
rear of the operator to the car top, and also to plumb the face of the drive wheel.
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