TM 5-3895-363-13&P
5.1 LIFTING CAM
The lifting cam is a part of the tripping device, and
it can be manually engaged to raise or lower the
hammer on the lead. A rope connected to the cam
lever and controlled by a member of the hammer
crew must be pulled downward to rotate the lifting
cam so the tripping device can pass between the
lifting blocks. Once the trip is below the lifting
blocks, the rope is released and the cam rotates by
spring action to the horizontal position (see Fig. 3).
The lifting cam also prevents accidental engage-
ment of the trip into the machine while operating.
Figure 3
WARNING:
NEVER TIE OR WIRE DOWN THE LIFTING CAM
LEVER. USE 1/4" NYLON ROPE OR EQUAL TO
OPERATE THE LIFTING CAM LEVER. KEEP THE
TRIP ROPE CLEAR AT ALL TIMES.
5.2 PISTON LIFTING PAWL
Once the tripping device is lowered past the lifting
blocks, the trip cam lever contacts the trip activa-
tor plate and the pawl rotates to engage in the
pick-up groove of the piston.
5.3 STARTING EXPLANATION
WARNING:
This paragraph is for explanation ONLY –
DO NOT ATTEMPT TO START THE HAMMER
WITHOUT FIRST READING SECTION 9.
6
5.3.1
5.3.2
5.3.3
5.3.4
The tripping device should be lowered past
the lifting block so the trip cam lever strikes
the trip activator plate, engaging the pawl in
the pick-up groove of the piston.
The trip rope should be pulled all the way
downward to rotate the lifting cam to a verti-
cal position so that it can pass freely between
the lifting blocks.
Signal the crane operator to raise the tripping
device. Once the trip is above the lifting
blocks, release the trip rope.
As the tripping device continues to move
upward, it will strike the trip release plate,
disengaging the pawl and allowing the
piston to fall.
WARNING:
It is good practice to check out the tripping
device before mounting it on the lead.
Check to see that:
A.) The lifting cam rotates freely and has
sufficient spring action to automatically
return to the horizontal position.
B.) The trip cam rotates freely and has suf-
ficient spring and locking action.
6.1 INSTALLING CUSHION AND ANVIL
6.1.1 First install 1/2" aluminum plate with chamfer
down into primary helmet.
6.1.2 Install 1 1/2" conbest into primary helmet.
6.1.3 Install 1/2" aluminum plate without chamfer
into primary helmet.
6.1.4 Install 1 1/2" conbest into primary helmet.
6.1.5 Install 1/2" aluminum pate without chamfer
into primary helmet.
6.1.6 Install anvil on top of previously installed cu-
shion and cable to primary helmet.
6.2 RIGGING PRIMARY DRIVE CAP
6.2.1 When rigging the drive cap, make sure that
all drive cap cables are of the same length, so
that the drive cap is suspended evenly and
does not bind on the lead.
6.2.2 Once the drive cap cables are tight, a gap of
1" to 2" should remain between the anvil
plate and the fully dropped out impact block
(Fig. 4).
