Ditch Witch AT Air Hammer - Manual (Page 5)

CMW
®
All Terrain Air Hammer
Attachment Operator’s Manual
Publication number: ID0273478; page 5 of 11
4. To join, scribe
straight line across
joint on both sides
of separating line
(A).
5. To join, scribe
second line (B) on
moveable side of
joint in the opposite
direction of
tightening action.
Refer to table for
correct dimension.
6. Connect Hydratong
power pack.
• Attach hoses
from power
pack to
cylinder.
• Attach leads (4)
to 12V battery.
7. To tighten or loosen
joint, move shuttle valve handle (2) toward gauge (3)
and press power switch (1).
8. To reposition chain tongs and continue tightening or
loosening joint, move handle away from gauge, then
back toward gauge, and then press power switch.
9. Monitor gauge and refer to decal to achieve
approximately 4000 ft•lb (5420 N•m) of torque. Then
tighten joint until second line (B) meets first (A).
10. Move handle to center (neutral) position to relieve
pressure.
11. Disconnect hoses and remove Hydratong
components.
Operate Air Hammer
To start hammering, turn on the drill fluid pump. Air will
enter the drill string.
Monitor Gauges
Drill Fluid
Maintain drill fluid flow at 2-10 gpm (7.5-38 L/min)
depending on the hole size, rate of penetration, and type
of material being drilled. The ideal drill fluid flow produces
a thin foam that allows cuttings to be cleared from the
hole without sticking to drill pipe.
Rotation
The correct rotation speed produces the best penetration
rate, the longest drill bit life, and smooth operation.
1. For a 6.5” (165 mm) bit with spherical inserts, begin
with inner rotation of 25 rpm.
2. Adjust rotation until penetration is approximately
3/8-5/8” (9.5-116 mm) per revolution.
Thrust
Maintain thrust at about 3200 lbf (14 kN) when operating
at maximum power. This is theoretically 600-800 psi (40-
55 bar) as measured by the thrust pressure gauge on the
drilling unit.
Note: Some operators increase thrust until rotation
pressure begins to pulse, then reduce thrust slightly until
rotation is smooth.
IMPORTANT: Gauge gives an estimate of
torque. Use scribe line to get exact torque.
j07om071h.eps
A
A A
A
B B
Wear hearing and eye
protection when operating air
hammer.
IMPORTANT: The air hammer requires resistance to
fire. If the bit is not next to hard rock air will simply flow
through the hammer without triggering percussion.