Using the hammer line (main hoist), raise the hammer trip assembly (with piston)
upwards along the hammer trip track rails until the piston falls (the lever and shaft
of the hammer trip assembly has encountered the trip disengage lug and the lifting
pawl disengages with the piston). Stop raising and then lower the hammer line
(main hoist) to lower the hammer trip assembly.
The impact hammer should start operating to drive the pile into the ground.
If the impact hammer does not start after five attempts, troubleshoot
the impact hammer by ensuring all Preventive Maintenance Checks
and Services (PMCS) identified as "Before Operation (B)" have been
If necessary, adjust the remote throttle pressure to increase or decrease the stroke
rate. Pressure can be reduced (reduce blow rate) by turning the pressure relief
valve counter clockwise until the desired pressure is indicated on the pressure
gauge (or stroke rate is achieved), then turn clockwise to close the valve. Pressure
is increased (increase stroke rate) by increasing the pressure with the handle.
If the pile line (aux. hoist) remains connected to components during
pile driving operations (i.e. ground-release shackles are not used),
simultaneously pay out the pile line (aux. hoist) cable as load lowers.
Do not allow tension to develop on pile line (aux. hoist) during pile
While driving the pile, the impact hammer will travel down the lead tower. Use the
hammer line (main hoist) to lower the hammer trip assembly as the impact hammer
descends. The hammer trip assembly should be maintained near the middle
portion of the hammer trip track rails during operation. Perform all Preventive
Maintenance Checks and Services (PMCS) identified as "During Operation (D)".
Ground-release shackles should be released when the pile has
penetrated at least three feet (91 cm).
When the pile has been driven to the proper length, the impact hammer should be
Shutdown the impact hammer by opening the pressure release valve on the
remote throttle (0 psi). The drop in pressure opens the throttle valve (needle block)
to allow the fuel being delivered by the fuel pump to be returned to the fuel tank.
This starves the fuel injectors and stops combustion, there-by stopping the piston.
When pile driving operation is suspended/completed, perform all Preventive
Maintenance Checks and Services (PMCS) identified as "After Operation (A)".
If pile driving operation will be suspended for a short period of time, for example,
overnight, the catch ring weather cap, intake/exhaust port weather cap, and piston
transportation pin should be reinstalled. If pile driving operation is complete and
the system will be removed, disassembled, and stowed, it is not necessary to
install the weather caps, and piston transportation pin at this time.
H-64 Change 1