8-M7
L4400 , WSM
HYDRAULIC SYSTEM
[2] POSITION CONTROL WITH DRAFT OPERATION (IF EQUIPPED)
Draft control is a system which maintains a constant traction load, and is suited for the work which needs heavy
traction load such as plowing.
The implement is automatically raised when its traction load is increased, and lowers when the traction load is
decreased. By maintaining a constant load level, it prevents the tractor from slipping and being loaded excessibly.
The setting traction load can adjusted by changing the position of the draft control lever.
The draft control system uses the same control valves as the position control system. Therefore it is possible to
use the mixed control. The traction load applied to the tractor is sensed and is fed back to the control valve by means
of the other linkage mechanism.
■
Position Control Operation
W1019618
• Lift
1. When the position control lever (2) is moved to the LIFT side, the position control link (1) is also rotated and pushes
the arm 1 (5).
2. At the same time, the arm 2 (3) is moved, the connected position control valve becomes the lift circuit, and the lift
arm goes up.
• Down
1. When the position control lever (2) is moved to the DOWN side, the position control link (1) is also rotated.
2. By the action, the arm 2 (3) and the arm 1 (5) are returned by the return spring (4).
3. The position control valve becomes the down circuit and the lift arm is lowered.
(Reference)
• For the feedback mechanism of the position control, refer to "[1] POSITION CONTROL".
(1) Position Control Link
(2) Position Control Lever
(3) Arm 2
(4) Return Spring
(5) Arm1
A : Lift
B : Down
KiSC issued 07, 2007 A
Tractor Manuals Scotland - Please Do Not Copy
Tractor Manuals Scotland
