Miller Electric OM-227 398D - Manual (Page 20)

OM-227 398 Page 16
5-6. Replacing Head Tube Liner In XR-Aluma-Pro Guns
Ref. 804 544-B
.
Turn OFF coolant supply before
removing head tube on
water-cooled gun.
The standard head tube liner will ac-
commodate wire diameters from
.030-.035 wire size.
When changing wire size, change
control box drive roll, idler and head
tube liner with appropriate sized lin-
er.
1
Head Tube
2 Head Tube Nut
Loosen head tube nut and remove
head tube from gun.
3
Head Tube Liner
Pull liner out of head tube.
Insert new liner into head tube (install
tapered end first) and reinstall head
tube onto gun.
.
A twisting motion may be need-
ed to feed liner thru head tube.
.
Be sure head tube is seated and
head tube nut is securely tight-
ened before operating gun. If
head tube nut is not adequately
tightened, unwanted arcing may
occur between head tube and
gun housing.
1
2
3
Tapered end
5-7. Changing Gun Contact Tip
Ref. 804 709-A
2
1
Remove nozzle
1
Nozzle
2 FasTip
Unscrew FasTip.
Install new FasTip.
.
Make sure correct size con-
tact tip is being used. Incor-
rect size may cause arcing in-
side tip, poor feedability and
poor arc starting characteris-
tics(see Section 9).
Reinstall nozzle.