Changing The Liner - Bernard Q20 Series Owner's Manual

Btb mig guns
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5-2 Changing the Liner

Page 11
A. Changing Universal Conventional Liner
1. Remove nozzle, contact tip, and gas diffuser/
retaining head and lay cable straight. Using a 10
mm wrench, turn liner lock counterclockwise until
it is free from the power pin. Remove liner from
gun assembly.
2. With cable laying straight, insert new liner into
power pin and feed through gun using short
strokes to prevent kinking. Twist liner clockwise
if necessary. Use a 10 mm wrench to turn liner
lock clockwise to tighten into power pin.
3. Trim to dimensions shown in the liner chart
below. Remove all burrs from end of liner and
replace gas diffuser/retaining head, contact tip
and nozzle.
New Liner Trim Lengths
Centerfire
Diffuser Part Number
D-1
D-1T
D-1T-5
DS-1
DS-1T
DW-1
Quik Tip
Diffuser Part Number
D114
D114Q
D118
D118Q
D118QLL
D1FQ
D218
TOUGH LOCK
Retaining Head
Part Number
ALL
1 1/2"
5/16"
1 1/4"
1"
7/8"
13/16"
3/4"
5/8"
9/16"
1/2"
1/4"
0
in.
Liner Trim Length
9/16"
14.3 mm
13/16"
20.6 mm
13/16"
20.6 mm
9/16"
14.3 mm
5/8"
15.9 mm
1/4"
6.4 mm
Liner Trim Length
5/8"
15.9 mm
9/16"
14.3 mm
3/4"
19.1 mm
3/4"
19.1 mm
1-5/16"
33.3 mm
7/8"
22.2 mm
7/8"
22.2 mm
Liner Trim Length
3/4"
19.1 mm
38.1
33.3
31.75
25.4
22.2
20.6
19.05
15.9
14.3
12.7
6.35
0
mm

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