Allied 5500, Technical Manual, Page: 24 / 68

6.2.3 Prepare Entrance Pit
~
CAUTION
Prevent injury to personnel by
observing all shoring safety
precautions.
Excavate the entrance pit to the depth,
width and length required to properly align
the piercing tool and work comfortably.
Pit length should:
•
Allow the operator to press the Hole-Hog
into the pilot hole when piercing begins.
•
Permit a soft bend in the Whip Hose. Do
not crimp the air supply.
6.2.4 Prepare Exit Pit or Target
Excavate the exit pit. The length, width,
and depth of the exit pit should exceed the
entrance pit dimensions by 6 in. to 10
in./152mm to 254mm.
In cases where the exit pit length is limited
and for blind holes, the unit is reversed and
drives itself back out through the pierced
hole.
6.2.5 Prepare The Hole-Hog and Air Hose
1. Refer to Section 10.0 Maintenance and
perform Daily and Preventive Mainte-
nance.
2. Review all of Section 7.0 Lubrication.
Startup Lubrication, paragraph 7.1
must performed at the beginning of
piercing operations, paragraph 6.2.7
3. To monitor Hole-Hog travel along the
piercing path, mark the air hose in two
ways.
a. Place tape at two foot intervals along
the hose.
This provides an indication of how far
the Hole-Hog has traveled along the
path.
b. Measure the total length of the pierc-
ing path. Measure that length from
the piercing tip, back along the
Hole-Hog and hose. Make a special
tape mark at that point.
This provides an indication of when
the piercing tool should reach the exit
point. It will also indicate if the tool
has been deflected off course.
4. Connect air supply hose to compressed
air supply and purge air hose.
6.2.6 Position and Aim The Hole-Hog
1. Verify that the bottom of the entrance
pit is at the depth (elevation) deter-
mined in 6.2.2, step 3.
2. Set the Hole-Hog in the entrance pit
with the piercing tip just touching the
forward wall, the wall to be pierced.
3. Align the length of the Hole-Hog with
the center of the exit pit or target at the
other end of the piercing path.
4. The nose of the tool must be pitched
down to compensate for a tendency of
the tool to raise along the path.
The amount of pitch depends on the
length of travel and the soil type.
Normally one half a bubble on a con-
struction level is sufficient.
5. Block the Hole-Hog in this position.
A
LLIED Model 5500 Hole-Hog
14 08/25/00