User Guide

25 Adjustments and Check Out
Doc 01-G0547
Rev D
Adjustments and Check Out
Clutch Adjustment
An adjustable friction type clutch is standard on the models
SL580 and SL590. It is important that you properly adjust
the clutch to obtain proper operator performance.
1 Loosen the 3 set screws on the clutch nut.
2 Back off the clutch nut until there is very little tension
on the clutch spring.
3 Tighten the clutch nut gradually until there is just
enough tension to permit the operator to move the
gate, but will allow the clutch to slip if the gate is
obstructed.
When the clutch is properly adjusted, it should
generally be possible to stop the gate by hand
during travel.
4 Re-tighten a set screw on the clutch nut that is
directly over a flat portion of the shaft.
CAUTION
The friction clutch is not an automatic reversing device. It
minimizes damage to the gate operator and gate. It can also
limit major vehicle damage, if adjusted properly. This
operator incorporates an internal obstruction sensor system,
but it is highly recommended that external obstruction
sensing devices such as gate edges or photo beams
systems be incorporated into the gate system to aid in the
protection of any possible pedestrian traffic. Periodic
inspection of the clutch system and all internal and external
sensor systems is required to ensure their proper operation.
01-G0547F23
Figure 24
MODEL: SL580
CLUTCH LOCATION
MODEL: SL590
01-G0547F24
Figure 25
Preliminary System Check Out
Before adding any options, accessories or adaptations, it is highly recommended that you check out
the system and its programs. If you have not already done so, temporarily connect a three button
station to the operator. Test for proper open, stop and closing of the gate. Test the internal
obstruction sensor system. Test for proper operation of all programs that were programmed into the
system. Once everything checks out okay, then proceed to adding on the accessory items for this job
site.
NOTE: LiftMaster recommends that if more than one accessory item is used, after each one is
attached, check it for proper operation before adding the next.
Important: Make sure that the two (2) gate warning signs are secured to the gate. One on the
inside and one on the outside. They must be easily seen.