7-14 SHB 28Z3 EN – Edition 2.0 * 28z3s710.fm
Options
Safe load indicator FR (up to serial no. AG02443)
Function
A hose burst valve is mounted directly on the base-side port of the boom ram, the other
valve is mounted on the rod-side port of the stick ram.
Extending the boom ram
• The ram can be extended as usual (always “free flow” towards the ram).
In the event of a hose rupture, the load is safely held in base position by means of the non-
return valve.
Retracting the boom ram
• Pilot control pressure moves valve (2) to work position (free oil return from the base
side).
• The valve moves back to home position if the pilot control pressure drops.
2
3
1
4
5
7
6
8
Pos.
Designation
1
Boom segment pilot control port
2
Joystick stick port
3
Joystick boom port
4
Stick pressure line port
5
Leak oil strip port
6
Pressure switch
7
Hose burst valve
8
Boom pressure line port
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