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3.4.2 CLUTCH ADJUSTMENT
In addition to the reverse sensitivity adjustment, this operator is equipped with a mechanical slip
clutch to further reduce the possibility of injury should an entrapment occur. Do not over tighten the
clutch in this gate operator to compensate for a damaged or poorly constructed gate, or to
compensate for a gate that is too heavy or that has damaged wheels or rollers. Doing this can create
a hazard which can result in serious injury or death to persons who may become entrapped.
1. Be sure power to the operator is turned OFF whenever adjustments to the clutch
are made. Loosen the center hex lock screw to "un-lock" the jamb nut (an allen wrench is
provided in the operator), and then loosen the jamb nut. You may have to hold the large
pulley to loosen this nut.
2. Tighten the jamb nut so that it is finger tight, and then tighten it one turn with a wrench.
Tighten the center hex lock screw to lock the jamb nut in place.
3. Apply power to the gate operator and cycle it to allow the operator to adjust its limit
settings as described in section 3.3.
4. Activate the gate operator by momentarily shorting across terminals 4 and 18 with a 1-
foot 18 AWG wire. When the gate begins to open, determine if the clutch is slipping. If the
clutch is slipping, turn power OFF and tighten the jamb nut one more turn as described in
step 2, then repeat steps 3 and 4 (This process may have to be repeated several times to
get the right clutch adjustment).
5. After adjusting the clutch so that the gate opens and closes without it slipping, place an
immobile object along the path of the gate so that the gate will strike it while in the open
cycle. The clutch should slip and the gate must reverse direction after striking the object.
If it does not, repeat steps 1-3 and 5 to readjust the clutch. NOTE: After the gate has
reversed, the operator will assume a "soft shutdown" making it necessary to initiate the
cycle again by momentarily shorting across terminals 4 and 18.
6. Place an immobile object along the path of the gate so that the gate will strike it while in
the close cycle. The gate must reverse direction after striking the object. If it does not,
repeat steps 1-3 and 6 to readjust the clutch. NOTE: After the gate has reversed, the
operator will assume a "soft shutdown" making it necessary to initiate the cycle again by
momentarily shorting across terminals 4 and 18 to initiate the auto close timer.
7. The ideal clutch adjustment will allow the operator to move the gate through its entire
travel cycle without slipping, but will slip upon contact with an obstruction with no more
than 75 Lbs of force. This force can be measured with a gate scale, DoorKing P/N 2600-
225.
Jamb Nut
Tighten
Clutch
Loosen
Clutch
Lock
Unlock
Center Hex
Lock Screw
Figure 36
30