87
iv) Remove the motor armature lead/plug (red and black wire, 18 gauge, and cut the
two leads about 2" - 3" from the plug. Strip the wire ends and connect them back
together reversed (i.e. red to black and black to red). Connect with wire nuts or other
suitable connector, do not simply tape them together. Insert the plug back on PC
boards.
NOTE
When first applying power to a modified operator or a new operator, verify that the rotation of
the motor is correct in relation to the position of the spring. The center shaft must rotate in the
direction shown by the arrow in the center of the spring hub (for a “LH” unit shown, opposite for
“RH”). If the rotation is incorrect and the spring gets even a 1/2 turn in the wrong direction, it
must be replaced. It will no longer have sufficient strength to operate properly. INCORRECT
ROTATION CAN BE DANGEROUS!
4. Reinstalling the Operator
Replace the operator in reverse order to the dismantling process:
a) Ensure the drive shaft lines up properly with access hole in the frame. Leave the
operator attachment bolts just ‘snug’ until the drive arm have been replaced.
5. To reinstall the Arm
a) Position door about halfway open:
b) Insert arm into the operator drive shaft. This may be difficult due to the 8 pins which
need to be inserted. Do not force the pins into position. The arm must be inserted in
such a manner as to permit pre-loading of the spring. A small amount of lubricant will
make inserting the pins easier.
Shaft Side
Insert the door arm into the operator drive shaft so that it starts out in position A (See Figure
# 56). There are 8 pins to insert, therefore care is needed to insert all the pins. Insert at
position C. This is easily accomplished from the shaft side, while standing in the cab and
positioning the platform 2' - 3' above floor level, at the top landing the access will be from the
car top.
Once inserted into position C, fasten the 1/4" x 2" FH screw into place to hold the arm in
position.
NOTE
If the screw is not inserted, it is possible that the drive pins in the door arm may shear off when
the arm is rotated manually and spring tension increases. The pins are also ‘shear pins’
designed to protect the gear unit in the event of a shock load to the door while in the open
position.
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