Miller Electric SS-74S12 - Manual (Page 17)

OM-1500−11 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 Roughneck C-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 780 ipm (1.3 To 19.8 mpm)
Standard All 3/32 To 7/64 in (2.4 To 2.8 mm) 50 To 700 ipm (1.3 To 17.8 mpm)
Standard All 1/8 in (3.2 mm) 50 To 300 ipm (1.3 To 7.6 mpm)
Optional High
Speed
All .023 To 5/64 in (0.6 To 2 mm) 92 To 1435 ipm (2.3 To 36.4 mpm)