Manual

justment
Step 16
ADJUST OPENER LtMITS: Run the opener through a com-
ptete up and clown cycle. Adjustments are not needed when
door opens and closes completely.
if door does not close completely, lengthen door arm as
required,
A,. Run door in UP direction. If it does not open enough, limit
nut adjustments are necessary. Proceed as follows:
CAUTION: Disconnect power before cover is removed,.
Bo Remove 4 cover screws as illustrated and slide cover for-
ward from chassis.
C. Adjustments are made by turning large plastic limit nuts up
or' down a threaded shaft just behind the motor (see illustra-
tion),, The limit nut retaining bracket which holds the nuts
in place must be loosened before nuts can be turned.
CAUTION: Do not run opener before limit nut bracket is
secured in original positiom
1. The top nut controls closing limits_
2. The bottom nut controls opening limits..
3. One turn of the limit nut equals 3 inches of trolley travel.
4. All adjustments require complete turns.
D,. TO MAKE ADJUSTMENTS: Loosen limit nut bracket screw..
Slide bracket to the left
1. To increase UP limits-turn bottom nut upward.
2. To decrease UP limits-turn bottom nut downward
3. To increase DOWN limits-turn top nut downward°
4_ To decrease DOWN limits-turn top nut upward..
5. These procedures may require repetition before adjust-
ment is complete..
E. When adjustments are complete, slide bracket to its original
position and TIGHTEN SCREW SECURELY before apply-
ing power'.
F.. Replace cover and 4 cover screws. Reconnect power_
CAUTION: After an adjustment, the motor will run when
power is turned on.
If door reverses at end of downward travel, the door arm is
too long. Shorten it one set of holes _ a time until reversing
ceases.
During limit nut adjustment procedure, if door reverses before
completing travel cycle in either direction, also check:
1.. Excessive binding of door (check manually and correct)..
2. Force adjustments are too light_ Refer to Step 17..
/
_/TO REMOVE
COVER
SCREW_-20
TURN NUT ONE COMPLETE
REVOLUTION FOR 3 _ OF
TROLLEY TRAVEL
LIMIT
NUT PLASTIC
_ RETAINER NUT SHAFT
\ \ \ ! [ _1_\ DOWN
LIMIT
-:;--
CAUTION: If the door opener is installed on a door
with a height greater than 6 feet, the "UP'"
limit must be adjusted.
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