Cam Adjustment - Fisher 4070 Instruction Manual

INDICATOR
COVER O-RING
FRONT
COVER
B2644 / IL
B2645 / IL

Cam Adjustment

Refer to figure 9. With the cover and indicator re-
moved, loosen the screw and turn the cam locking nut
counterclockwise until the cam loosens.
The cam has two lobes. The 30 degree lobe is used
for actuator travels of 3/4-inches (19.1 mm) or less.
The 60 degree lobe is used for actuator travels of
IDENTIFICATION
COVER
Figure 8. Front Cover and Indicator Cover
CAM LOCKING NUT
SCREW
CORRECT
CAM
INCORRECT
Figure 9. Cam Adjustment
Type 4060 & 4070
FRONT
COVER
O-RING
INDICATOR
NOTCH
COVER
FRONT COVER SHOWN WITH O-RING LOOPED
OVER NOTCHES TO PERMIT DRAINING
CAM POSITIONED FOR A FAIL-OPEN
ACTUATOR WITH 3/4-INCH (19.1 MM)
OR LESS TRAVEL
greater than 3/4-inch (19.1 mm). The cam also may be
turned over. Each lobe is stamped either direct (D) or
reverse (R). Refer to table 4 for cam installation infor-
mation.
Install the cam so that the follower will ride on the cor-
rect lobe listed in table 4. For fail-open actuators, the
follower will ride on the cam lobe to the right of the
follower. For fail-close actuators the follower will ride
on the cam lobe to the left of the follower.
CAM
1/16-INC H
FOLLOWER
(1–2 mm)
7