12
HAMMER OPERATION
Precautions
When used in water, any hammer is subjected to much more severe conditions
than when used on land. Therefore, the hammer must be handled more
carefully.
1) Never operate the hammer without air supply.
2) Never start to operate the hammer before the compressor tank pressure
reaches 85 PSI.
3) If the air supply is stopped during operation, stop operation
immediately and determine the cause.
4) If the carrier is on board a barge, the tool is more liable to break because the
force of the carrier and the sway of the barge from wave action will act
together on the tool.
5) Grease is blown off by supplied air. Grease the hammer generously and
more often than when used on land. If the unit is equipped with an autolube,
it is still recommended that the hammer is greased manually every hour.
Before start up
Grease the hammer per the instructions in NPK Hydraulic Hammer SERVICE
MANUAL.
Setting the air pressure
1) Start the compressor to supply air to the hammer before it is submerged in
the water.
2) Extend the carrier boom down to the maximum working depth used on the
job site and keep the hammer submerged in the water. Bubbles will be
generated from the tool area due to air supply.
3) While maintaining the above condition, reduce the air pressure gradually with
the pressure regulator, and set the supplied air pressure at the minimum
level required to produce bubbles.
1) Reduce the pressure of the compressed air with the regulator as instructed
above.
Do not supply unregulated high pressure compressed air (85 PSI) from the
compressor directly to the hammer. Excessive air pressure may be forced
into the hammer through the sealed area.
2) A compressor with higher capacity than shown in the table can be used, but
be sure to control the pressure as described above because the volume of
compressed air supplied is greater.
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