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July 2021
HE18 | User manual
Switching on the extra circuit function
The extra circuit has been designed for the use of hydraulic attachments such as, for example, a hydraulic hammer.
The flow volume may be set prior to using the extra circuit.
Switching the extra circuit on is done with the extra circuit switch. The switch is active is the left control console is
lowered and the starter switch is in the RUN position. If the extra circuit is switched on, the extra circuit indicator
light will be lit up or flash.
The operating setting can also be execute with the switch.
The proportional steering makes the proportionate speed regulation of an
attachment possible. For example: if the rocker switch is moved halfway to
the left, the attachment will move at about half speed.
•
If you move the extra circuit rocker switch (
1
) in direction (
A
), the oil
will flow to the connection (
A
) on the right side of the arm.
•
If you move the extra circuit rocker switch (
1
) in direction (
B
), the oil
will flow to the connection (
B
) on the left side of the arm.
Direct return changeover valve
The changeover valve (
1
) has two switch positions.
In the “direct return” position, there is a return from the attachment
directly via the return filter to the reservoir for hydraulic oil. The return only
takes place via the right extra circuit connection on the left side of the arm.
In the “in direct return” position, the return is from the attachment via the
valve block to the return filter and then to the to the reservoir for hydraulic
oil. In this case, the return can take place via the left or right connection
(according to the position of the extra circuit pedal or the extra circuit
rocker switch) on the arm.
Depending on the operation of the installed attachment (rotating or hammering), turn the changeover valve into
the required position in accordance with the diagram.
CAUTION
If the changeover valve is in the “direct return” position even though an attachment with indirect return has been
installed, the return to the hydraulic oil tank will remain open! This could lead to sudden movements or falling down
of the attachment even if the machine has been switched off.
Make sure the changeover valve has been set consistent with the attachment.
Summary of Contents for HE18
Page 128: ...Page 128 131 July 2021 HE18 User manual ELECTRICAL DIAGRAMS 1 Electrical diagram 1 ...
Page 129: ...Page 129 131 July 2021 HE18 User manual 2 Electrical diagram 2 ...
Page 130: ...Page 130 131 July 2021 HE18 User manual 3 Electrical diagram 3 ...
Page 131: ...Page 131 131 July 2021 HE18 User manual 4 Electrical diagram 4 ...
