Cam Removal :
Disconnect cam return spring. With a wrench carefully placed on the output shaft (if necessary), loosen and remove the
jam nut. Remove pressure from the span arm by pushing it away from the cam. Remove the cam.
Cam Installation:
1. Make sure shaft is properly aligned with coupler or actuator.
2. Push span arm away from shaft to avoid pressure on the cam.
3. Place cam over the shaft with the appropriate characteristic facing up and closest to the span arm roller. “D”
represents direct-acting and “R” represents reverse acting.
4. Make sure the round mark on the left hand side of the characteristic curve is lined up with the span arm roller bearing.
See Figure 3
5. Tighten jam nut making sure cam does not rotate. Use a flat screwdriver to prevent cam rotation and shaft flats to pre-
vent shaft rotation (if necessary)
6. Connect supply pressure to port marked ‘Supply.’stroke actuator/valve two or three times to align position with
actuator. With a 50 percent input signal, tighten all mounting bolts. Stroke actuator to verify proper alignment.
Position Calibration:
Introduction
APEX 8000 positioners are calibrated at the factory; however, due to shipping and handling, it may be necessary to check
the calibration before operating the valve. The APEX 8000 positioner can be calibrated to a range of 3-15; two-way split
range, 3-9, or 9-15; and three-way split ranging, 3-7, 7-11, 11-15 psi using the standard feedback spring.
WARNING: When stroking the actuator during calibration, keep hands, hair and clothing away from moving parts.
Failure to do so may cause serious personal injury.
Note: Positioners and I/Ps are calibrated at the factory. Use mechanical adjustments in positioner for calibration.
Zero and span on the I/P should not be used to calibrate the valve.
For calibration, refer to Figure 4 and proceed as follows:
