Chapter D
Chapter D
Adjustment mode
167
W301-0411E
3.2 Swing Output Adjustment (Offset Method)
By the adjustment of swing output (current) Ao1, Ao2, (CN6-pin1, pin3), the stop point is adjusted.
The current value to the proportional solenoid valve that controls the pilot pressure given to the swing control
valve’s spool is increased by the F2 key. The speed of the swing table decreases as the amount of oil supplied
from the swing control valve to swing motor is gradually decreases (opening / clearance between the swing
control valve body and spool decreases). Finally, hydraulic oil is not supplied to the swing motor any more
(the clearance between the valve body and spool becomes none), and the swing table stops. The deceleration
condition varies depending on the crane serial No. Adjustment is necessary depending on every serial No.
In the valve adjustment item selection screen shown in Fig. 3.1.1, select "Swing right" or "Swing left," and then
press the <
> key to display the swing output adjustment display shown in Fig. 3.2.1.
Fig. 3.2.1 Swing output adjustment display
Perform the adjustment according to the procedure below.
- In the specified condition (boom fully retracted, jib stowed), set the engine speed to the maximum, and
change a full lever stroke to the subjected swing direction. (Confirm the level with O/R max. extended)
- In the swing operation status, while increasing the D/A value by pressing the < > key (+), search the position
where the value stops.
- Once the position where D/A value stops, press the <
> key to store the data. The screen automatically
returns to the valve adjustment menu shown in Fig. 3.1.1.
- To go back to the valve adjustment menu of Fig. 3.1.1 without storing the adjustment value, press the < >
key.
Table 3.2.1 Swing right output adjusting (Offset Method)
