PRODEM PRB 030 - Anti-Blank-Blow (Auto-Stop) Function Operation

- 27 -
5.10. Anti-Blank-Blow (Auto-Stop) function
For PRB200 and bigger model
1
2
3
1. Plug
2. O-ring
3. Shut-off valve
The PRB200 ~ PRB700 hydraulic hammers are equipped with Anti-Blank-Blow (Auto-Stop) function as
standard for easier operation and longer product life. The Anti-Blank-Blow function prevent the hammer
operating in no-load condition, i.e., when the chisel is not properly pre-loaded by contact with the object to be
broken.
Blank blows –in other word, idle blows– which apply impact on the chisel without contact with the object, are
very harmful for the hammer. Therefore, without the Anti-Blank-Blow function, the hammer always should be
pressed down onto the object before starting the hammer and should be stopped immediately as soon as the
object is broken. When operated without pre-load or operated furthermore after that the object is broken
completely, blank blows could result in excessive wear, deformation or breakage to major components such
as chisel, chisel pins, stop pins and front head.
With the Anti-Blank-Blow function, the hammer does not start operating unless the chisel is pre-loaded by
contact with the object, and the hammer stop operating automatically when the chisel does not contact with
the object according as the object is completely broken even though the operator keep operating switch
pressed ‘on’.
The Anti-Blank-Blow function is constructed with a by-pass line and a Shut-off Valve in the cylinder. The
Shut-off Valve is a switching valve to disable the Anti-Blank-Blow function for special application.


 Disabling the Anti-Blank-Blow function
For special working condition, e.g. breaking over-size boulders or non-rigid object, the Anti-Blank-Blow
function can be disabled by inserting the Shut-off valve as shown in the figure above.
To disable the Anti-Blank-Blow function,
1. Stop the carrier, and close the stop valves
2. Remove the plug (1) (which include O-ring).
3. Insert the shut-off valve (3) using a M10 bolt.
4. Tighten the plug (1) again with the specified torque.
To enable the Anti-Blank-Blow function again, remove the shut-off valve in the same way above.
Important! When operating the hammer with the Anti-Blank-Blow function disabled, be sure to not operating
the hammer in blank blowing condition.