8. removing safety collar and adjusting boom, 9. gun recommendation table – Miller Electric SS-75S12 User Manual
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OM-230 298 Page 13
4-8. Removing Safety Collar And Adjusting Boom
1
Locking Knob
Tighten knob to prevent boom
movement. Loosen knob to allow
boom movement. Change knob po-
sition to limit upward movement.
Pull boom down slightly and remove
safety collar. Boom should balance
in any position from horizontal to 60
degrees above horizontal. If neces-
sary, adjust boom as follows:
2
Threaded Rod
3
Jam Nut
Loosen jam nut and turn threaded
rod until boom balances. Tighten
jam nut. Be sure several full threads
are through yoke to prevent boom
falling.
4
Yoke
Retain safety collar for use in disas-
sembling or moving boom.
Ref. ST-152 380-A
1
2
3
4
Increasing Spring
Pressure For A
Heavy Gun
Decreasing Spring
Pressure For A
Light Gun
4
3
2
Tools Needed:
1-1/8 in
Rod
Rod
4-9. Gun Recommendation Table
Process
Gun
GMAW − Hard or Cored Wires
Q-Series Guns: 300, 400, 500, And 600 Amp.
FCAW − Self-Shielding Wires
FC-1260 Or FC-1150
4-10. Wire Type, Size, And Feed Speed Capability Table
Motor Speed
Wire Type
Wire Size
Feed Speed Capability
Standard
All
.023 To 5/64 in (0.6 To 2 mm)
50 To 1400 ipm (1.3 To 35.6 mpm)