30
!
NOTE :
When operating in Draft Control, the Position Control Lever, (Figure. 3.2) should normally
be at the bottom of the quadrant. However, the Position Control Lever may be used in
conjunction with Draft Control to limit the maximum depth of correction to achieve a more
even depth of cultivation in fields with widely varying soil conditions.
When grading and backfilling with light equipment, such as a rear blade, it may be
desirable to prevent the blade from "diving". This is accomplished by using the Position
Control Lever in conjunction with the Draft Control Lever.
Position Control Operation
Set the required implement height/depth using the Position Control Lever (Figure. 3.2). Pull the Lever
back to raise the implement height
/
depth using the Position Control Lever. Pull the Lever back to raise
the implement, push forward to lower. Implement height
/
depth is relative to the position of the Lever
in the quadrant.
!
NOTE:
When operating in Position Control the Draft Control Lever should be pushed down to the
bottom of the quadrant
When the required implement working height
/
depth has been established, set the adjustable stop
adjacent to the Position Control Lever to locate the position for repeated use. The Lever may be
eased sideways when it is required to by pass the adjustable stop.
The adjustable stop is reversible after loosening the central clamp screw so that it may also be used
when operating in Draft Control.
When operating in Position Control it is of no advantage to restrict the oil flow in the hydraulic system.
However, the manual flow control valve (where fitted) may be used to reduce the rate of lift of the
three-point linkage, if required. To reduce the rate of lift, tilt the Flow Control Valve lever / knob, (18 -
Fig. 3.2).
,
forward. Tilt the Rocker rearward to increase the rate of lift.
!
NOTE:
When transporting equipment on the three-point linkage set the adjustable stop to maintain
the Position Control Lever in the raised position. This will prevent accidental movement of
the Lever which could result in attached equipment lowering and becoming damaged or
damaging the road surface.
Draft Control operation with Position Control
Position Control may be used together with the Draft Control as follows
:
Set the Position Control Lever at the maximum desired implement depth. The hydraulic system will
not lower the implement below this depth. This will also prevent "diving" which may be encountered
with light equipment, such as a rear blade, when grading or backfilling.
Adjust the Draft Control Lever for the maximum required draft load (pull).
The hydraulic lift system will now provide normal draft response within the range set by the Position
Control. This adjustment provides a more uniform depth while maintaining an even pull in widely
varying soil conditions.
!
WARNING
:
Do not transport or attach equipment when the hydraulic system is in Draft Control. Use
Position Control for these operations. Always lower hydraulic equipment to the ground
before stopping the tractor.
