Draft Control - Kubota M8540 Workshop Manual

M8540, M9540, WSM

(2) Draft Control

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 excessively.
The setting traction load can be adjusted by changing the position of the draft control lever (5).
The draft control system uses the same control valve as the position control system. The traction load applied to
the tractor is sensed and is fed back to the control valve by means of the other linkage mechanism.
With this type of draft control, operation is as
described below according to the position of the draft
control lever.
1. When the draft control lever is positioned in the
floating range (1), the implement lowers to the
ground.
2. When the draft control lever is positioned in the draft
control range (3), work is performed as follows.
- As the traction load applied to the tractor from the
implement increases, the implement is raised.
- As the traction load decreases, the implement
lowers to the position at which it matches the setting
traction load.
3. When the implement is raised as described in 2
above, the force to raise the implement is applied to
the rear wheels so that the ground pressure of the
wheels is momentarily increased to prevent slippage.
(Reference)
• When the draft control is used, the position control
lever should be set at "FLOATING" range.
• If the position control lever is set at working range,
both control systems operate performing mix control
system. (Refer to "(3) Mixed Control".)
(1) Floating Range
(2) Deep
(3) Draft Control Range
8-M11
HYDRAULIC SYSTEM
(4) Shallow
(5) Draft Control Lever
W1016418
KiSC issued 09, 2008 A