Atlas Copco Secoroc YT29A Manual de instrucciones del operador - Página 7
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4. Air/water pressure and hose dimensions
Air pressure
Ensure that the compressor can deliver the required air pressure of 5 bar at the tool.
High pressure (>6.3 bar) causes rough operation and damage.
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Low pressure (<4 bar) results in a slow drilling speed.
Water pressure
Make sure that the water pressure is set to around 3 bar.
Note! Maximum water pressure is 1 bar less than the working pressure. For
example if the air pressure is 5 bar, the water pressure must be below 4 bar
to prevent water entering the impact mechanism.
Note! Dry drilling is strictly prohibited. Operation without air- and water tubes is not
allowed as it will result in poor drilling performance.
Hose dimensions
The air hose diameter must be no less than 25mm. Inner diameter of connection
nipple and hose must be no less than 19mm. The ideal overall air hose length is
less than 15m.
Fitting and removing the tool
Before fitting the working tool
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Check that the tool shank is of the correct size and length for the chuck used.
The shank must be clean and the tool must be in good condition.
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The suitable quenching hardness of the shank is HRC48-53. Harder end face will
cause piston damaged and breakage of the end face of the piston. If the shank
face is too soft, it will be easily deformed by the piston, which will result in
difficulty in removing the working tool.
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Shank end face shall be flat and perpendicular to the axis.
Remove sharp edges from the shank's end face. Rough shank surface will cause
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premature piston failure.
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Inspect the bits: Dull bits will slow down the drilling speed and overstrain the drill
mechanism. When changing bits make sure that the new bit is the correct size to
follow your previous bore.
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Before drilling check that the flushing hole in the working tool is not blocked.
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