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Figure 3-8. Control relay assembly. exploded view.
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Figure 3-9. Speed control box assembly, sectional view
i.  Reassembly.
linkage to the shaft in the speed control box assembly.
Reassemble the parts in the
(fig. 3-9.) The action of the spring holds the arm in the
contactor box by installing the mounting hardware and
position shown when no pressure is applied to the pedal.
other parts removed. (fig. 3-3.) Be sure an insulator is
(2)  The arm determines the position of the
placed under each contactor when it is remounted to the
actuator, which is held by the set screw to the
control unit box.
potentiometer  shaft.
In  the  up  position,  the
3-6.  Speed Control
potentiometer provides a resistance of about 15.000
a. General.
ohms.
(1)  The  speed  control  consists  of  the
(3)  When the pedal is depressed, the actuator
accelerator pedal linkage and the speed control box
rotates clockwise, turning the potentiometer shaft and
assembly.
The box assembly includes the speed
releasing the microswitch plunger.
This rotation
interlock microswitch and the speed potentiometer. The
decreases the resistance of the potentiometer.
speed potentiometer should be adjusted prior to the
(4)  Maximum  depression  of  the  pedal  is
adjustment of the inching control on the control unit.
reached when the arm bears against the down stop. At
(2)  Before working on the speed control;
this point, the potentiometer provides a resistance of
disconnect battery and discharge capacitors (para 2-5).
about 40 ohms.
b. Description.
(1) The accelerator pedal is connected through
3-16

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