Operator`s manual

8.10.2 Calibrating the Limit Switches
The position of the Limit Switch Activating Cams can be adjusted by loosening the set screws and sliding
the Cam, left or right, on the Indicator Assembly Screw (see Figure 8-9, numbers 1, 2, 6 and 9). One
cam has a lug which activates the limit switch controlling the ladder deceleration during extension. The
same cam then trips the limit switch controlling maximum ladder extension (8). To set this cam extend
the ladder until it is approximately 8" from maximum extension. Loosen the set screw on the controlling
cam (6) and slide the cam until its lug trips the Extension Deceleration Limit Switch and just trips the
Extension Control Switch. Tighten the set screw.
CAUTION
Do not adjust the cam to activate the Extension Limit Switch at maximum extension. This
action could result in the ladder being locked in the fully extended position by the Locking
Pawls.
To set the ladder Retraction Limit Switch, elevate the ladder to approximately 45 degrees and extend the
ladder until the rear of Section 2 is 1" from the retraction stop on Section 1. Loosen the set screw on the
controlling cam and move the cam until the Retraction Limit Switch is just activated.
CAUTION
Do not set the Retraction Limit Switch with the Ladder at 0 degrees. Without the weight of
the ladder hanging in the cables at the time the switch is adjusted, the 1" separation may
not be sufficient to prevent the ladder from slamming into the rear stop.
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