Tracker LS2 2020, Руководство по ремонту и обслуживанию

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B
SPEED CONTROL
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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Repair and Service Manual
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SPEED CONTROL
Fig. 1 Accelerator and Speed Control System
NOTICE: The linkages that control the accelerator
mechanism and governor 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. In the follow-
ing text, there are references to removing and
installing bolts and other fasteners. Additional hard-
ware (nuts, washers, etc.) that are removed must
always be installed in their original positions unless
otherwise specified. Non-specified torques are
shown in the table in the General Information and
Routine Maintenance section.
To prevent possible injury or death,
follow the lifting procedure in the
SAFETY section of this manual.
Place wheel chocks in front and behind the rear
wheels. Check the stability of the vehicle on the jack
stands before starting any repair procedure. Never
work on a vehicle that is supported by a jack alone.
SYSTEM OPERATION
Pedal Box Operation
As the accelerator pedal is pressed, the accelerator rod
moves towards the rear of the vehicle by overcoming the
resistance of the accelerator return spring (Ref. Fig. 1).
As the accelerator pedal moves, the parking brake is
released, the micro switch closes and activates the
starter-generator.
The rear end of the accelerator rod is joined to the micro
switch cam which connects to the accelerator cable.
As the micro switch cam moves to the rear it pulls the
accelerator cable, which pulls against the governor
spring.
When the accelerator cable pulls against the accelerator
cable/governor spring, the spring extends until it over-
comes the resistance exerted by the governor mecha-
nism. As the governor spring overcomes these forces, the
governor arm moves and the motion is transferred
through linkage rod to the throttle plate.
Governor Operation
Until the vehicle reaches its governed speed, the it will
continue to accelerate in relation to the accelerator pedal
position. When governed speed is reached, the ground
speed governor in the rear axle assembly operates
against the governor spring and closes the throttle plate
until the correct governed speed is achieved (Ref. Fig. 1).
It is the force of the governor spring in response to accel-
erator pedal and governor arm position which controls the
position of the throttle plate. This spring cushions sudden
changes in throttle linkage position to provide smooth
power transmission.
Governor Lever - Upper
Governor Lever - Lower
Accelerator Cable
Accelerator
Compression
Spring
Governor
Spring