Cub Cadet 8354, Руководство по обслуживанию, Страница: 251 / 289

HYDRAULIC SYSTEM
9-17
D615-W02 May-2003
When roller 4 (11) meets the inclined plane of the draw-
bar pull cam (12), it permits the counterclockwise rota-
tion of lever (7) which by means of shock absorbers (8)
will rotate transmission arm (9) in a clockwise manner
thus releasing the distributor shaft (21) to move into
neutral position “N”.
In discharge position “S”, the lever (2) will continue its
downward movement and cause the arms to lower. In
fact, during the initial part of the downward movement
of the drawbar pull control lever (2), no lowering of the
cam arms can be noticed.
The force of traction at the hitch point (20) acts on ten-
sion rod (18) in the direction indicated by arrow “RP”
causing the flywheel (19) to rotate clockwise together
with the drawer pull cam (12) which is fastened to the
same stud.
When the inclined plane of the drawbar pull cam (12)
meets roller 4 (11), clockwise rotation of the lever (7) is
achieved. By means of the shock absorber (8) it causes
the transmission arm (9) to rotate counterclockwise
thereby brining the distributor shaft (21) into neutral
position “N” and stopping all movement of the arms.
As the force of traction is increased, the drawbar pull
cam (12) will further move roller 4 (11) incrementing
the movement as described above.
Distributor shaft (21) will move from the neutral posi-
tion “N” toward delivery position “C” causing the arms
to be lifted.
When the force of traction diminishes, it will cause an
inverted action of the leverage system as previously
explained.
C. Combined Operation of Positioning and
Drawbar Pull
(Fig. 615W918A,615W919A)
To utilize the lifting device in this condition, it is neces-
sary to observe the following instructions; Move the
positioning control lever (1) upwards (in relation to the
lower backstop on the sector) until the maximum work-
ing depth has been attained. Determine the desired
minimum working depth by operating the drawbar pull
control lever and raising it from zero position so that
roller 4 (11) by acting on drawbar pull cam (12) will get
distributor shaft (21) into lifting position “C”, and cam
(12) should also cause a further upward movement of
the lifting arms.
Due to the position previously established by the posi-
tion control lever (1), the lever (7), arm (4) and position
cam 1 (6) will prevent the distributor shaft (21) from
entering the lowering position “S” and therefore the
arms cannot sink, even though the force of traction act-
ing on the hitch point (20) will tend to diminish by stress-
ing tension rod (18) in the direction of arrow “N”.
Such condition will not keep the lifting device from op-
erating under drawbar pull control, providing the work
is carried on in reasonably consistent soil. The trac-
tion force acting on hitch point (20) will then tend to
increase exerting stress on tension rod (18) in the di-
rection of arrow “RP”.
Consequently the combined operation of the position
control and drawbar pull control will limit variations in
height toward the ground as they intervene during use
of controlled drawbar pull, at the same time ensuring
the maximum possible depth desirable.
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