Ditch Witch AT Air Hammer - Manual (Page 10)

CMW
®
All Terrain Air Hammer
Attachment Operator’s Manual
Publication number: ID0273478; page 10 of 11
As Needed
Change Air Hammer Bits
Change air hammer bits whenever inserts are worn.
To remove:
1. Break joint at chuck and remove bit/chuck assembly.
2. Remove o-ring (4) from bit lock (3).
3. Remove bit (1) from chuck (2).
To install:
1. Slide bit (1) into chuck (2).
2. Assemble bit lock (3) over end of bit and secure with
o-ring (4).
3. Install bit/chuck assembly into casing (8) and tighten
to 6000 ft•lb (8124 N•m).
Specifications
1
2
3
4
8
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General U.S. Metric
Standard drill pipe connection 3.5 in API Reg Pin
Shank style QL 60
D Outside diameter 5.4 in 138,2 mm
L1 Length without bit shoulder to
shoulder 44.6 in 1131,8 mm
L2 Length with bit extended 49.5 in 1256,3 mm
L3 Length with bit retracted 48.1 in 1220,7 mm
Weight without bit 200 lb 90,9 kg
Backhead across flats 2x4 AF
Recommended air pressure 350 psi 24,1 bar
Make-up torque 6000 ft•lb 8124,0 N•m
Recommended fluid flow 3-4 gpm
Air volume 973 cfm 458 L/sec
Blows per minute 1770 1770
D
L
L2
L3
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