Page M-1
Repair and Service Manual
B
B
ELECTRONIC SPEED CONTROL
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Fig. 1 Accelerator and Speed Control System
ACCELERATOR, GOVERNOR AND
CARBURATOR LINKAGE
System Operation
Th
e
linkages that control the accelerator mechanism, gover-
nor and carburetor are designed to operate as an integrated
assembly. Any adjustment to one portion of the system will
have an effect on the other components within the system.
As the accelerator pedal is depressed, the accelerator
rod moves towards the rear of the vehicle by overcom-
ing the resistance of the accelerator return spring (Ref
Fig. 1 on page M-1).
When the accelerator pedal is depressed, the accelera-
tor rod moves towards the rear of the vehicle by over-
coming the resistance of the accelerator return spring
(Ref Fig. 1 on page M-1).
As the accelerator pedal moves, the micro switch closes
and activates the ignition circuit. The rear end of the
accelerator rod is joined to the control arm link, which in
turn is attached to the control arm with a pin which slides
within a slot in the control arm link.
As the accelerator rod moves to the rear of the vehicle,
the control arm rotates and pulls the accelerator cable.
When the accelerator cable pulls against the accelerator
cable/governor spring, the spring compresses until it
overcomes the resistance exerted by the governor
mechanism and its extension spring. As the accelerator
cable/ governor spring overcomes these forces, the gov-
ernor bell crank moves and the motion is transferred
through the governor cable to the throttle lever on the
carburetor.
Governor Operation
Until the vehicle reaches its governed speed, the vehicle
will continue to accelerate in relation to the accelerator
pedal position. When the governed speed is reached,
Accelerator Pedal
Accelerator Rod
Accelerator Cable
Accelerator Cable/
Governor Spring
Rear Bellcrank at Rear Axle
Governor Extension Spring
Accelerator
Return Spring
Micro Switch Cam
Micro Switch
Control Arm Link
Control Arm
Clevis
Throttle Lever
Connection
Governor Cable
NOTICE
Summary of Contents for 625619 2012
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