START-UP OPERATION
HAMMERS THAT ARE NEW, REBUILT, OR
HAVE BEEN INACTIVE
Before using a new hammer for the first time, the first time after rebuild, or a
hammer that has been inactive for a long period of time:
1. Check the nitrogen gas pressure.
The nitrogen gas pre-charge is factory checked before shipment. However, it is
recommended the pressure be checked before using the NPK HYDRAULIC
HAMMER for the first time. For the inspection procedure, see CHECKING THE
GAS PRESSURE, page 64.
2. At idle (THP1), raise the hammer off the ground. Place hammer vertical and
activate the hammer hydraulic circuit for 3 – 5 second intervals. Continue for an
additional 3 – 4 times to ensure that all the air has been purged from the hoses and
the hammer before first use. Failure to do this could result in damage to the
hammer’s internal components.
3. Place hammer firmly against the material to be broken (see “PRELOAD THE
TOOL BEFORE STARTING”). Operate the hammer in a vertical position for
approximately 10 minutes at one-half (THP2) engine speed. Increase engine speed
to three-quarters (THP3) and continue operating at this speed for another 10 to 20
minutes. Increase to full engine speed (THP4). Maintain vertical position for the
duration of the operation.
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