Table H-6. Operator's Preventive Maintenance Checks and Services (PMCS) (Continued)
B Before Operation
A After Operation
D During Operation
Item to be Inspected
Exercise the impact hammer once by performing the
Impact Hammer Exercise
following procedure with the weight of the impact
hammer fully resting on a pile or a pile adapter:
The lifting pawl of the hammer trip
assembly will not be able to engage with
the lifting collar of the piston unless the
weight of impact hammer is fully resting on
a pile or pile adapter.
a. With no pressure indicated on the pressure
gauge of the remote throttle, pull and hold
the trip safety lever cord to engage the trip
engage lug (allows the impact hammer
piston to be raised by the hammer line (main
b. Using the hammer line (main hoist), raise
the piston and let it free fall.
c. Ensure all mechanisms operate properly
and without binding.
d. Ensure all excessive lubricant and moisture
has been blown from inside the cylinder. If
excessive lubricant or moisture was present,
repeat the Impact Hammer Exercise until the
cylinder chamber is clear.
Periodically inspect the piston as it rises out of the
top of the upper cylinder. If it appears shiny, the
impact hammer is lubricated properly. If the piston
appears dull, stop the impact hammer, fill the
lubricating oil tank, and prime the system. Also
ensure that the oil tank plug/vent valve and oil pump
feed shutoff valve are fully open.
Impact hammer and
Stop the impact hammer operation every twenty
spotter slide greasing
minutes or after 1,000 blows and perform the
The full weight of the impact hammer must
be on a pile or on a pile adapter (square
or sheet) to distribute the grease properly.
a. Using the grease gun charged with MIL-G-
10924 grease, grease the four lower cylinder
(impact block) lubrication fittings (ten shots
b. Using the oil gun charged with MIL-L-2105
oil, apply three shots of oil to the fuel pump
lubrication fitting and oil pump lubrication
c. Inspect the impact hammer gibs, hammer
trip track rails, and spotter slide for adequate
lubrication. If necessary, using the grease
gun charged with MIL-G-10924 grease,
grease the fittings.
H-58 Change 1