Figure 12-2. Actuator Test Circuit
shaft towards maximum fuel and counterclockwise to
move it towards minimum fuel.
Set test circuit to CENTER. Observe and note
direction and position of terminal shaft
If terminal shaft moves to another
position set test circuit to OFF.
For a clockwise
movement turn pilot valve plunger
screw (63) slightly
For a counterclockwise
movement turn screw (63) slightly
Note the new position for
reference in case more adjustment
Repeat steps 8(a)1. and 3. or
8 (a) 2. and 3. until no movement of the
terminal shaft occurs when the test circuit is
moved from OFF to ENTER. Continue on
to step (9) and calibrate terminal shaft.
If terminal shaft did not move
from its original position, the pilot valve
plunger is centered. Continue to step (9)
and calibrate terminal shaft.
(9) Turn test circuit to OFF and set potentiometer to zero
remainder of test to prevent damage to
the magnetic properties of the magnet.
Set test circuit switch to NORMAL.
Adjust potentiometer to 20 ma.
Turn spring seat (56) counterclockwise until
actuator terminal shaft