Adjusting Engine Speed On Models With Automatic Idle (Optional) - Miller Electric Big Blue 300 Owner's Manual

8-7. Adjusting Engine Speed On Models With Automatic Idle (Optional)

Engine Speed
(No Load)
1880 rpm max
(62.6 Hz)
1500 rpm
(50 Hz)
1
4
.
To prevent solenoid
damage, be sure a 1/8
in (3 mm) gap exists be-
tween the engine low
speed screw
throttle lever when the
solenoid is held in the
energized position.
2
3
Engine Speed Adjustment
After tuning engine, check en-
gine speed with tachometer or
frequency meter. See table for
proper no load speed. If neces-
sary, adjust speed as follows:
Start engine and run until warm.
Turn Process/Contactor switch
to Stick − Weld Terminals Al-
ways On position.
1 Throttle Rod / Plunger
2 Lock Nut
3 Rubber Boot
4 Adjustment Screw
Adjustment screw is not used to
adjust engine speed when auto-
matic idle option is installed.
However, it must be at least 1/8
in (3 mm) away from the throttle
arm when engine is running at
idle rpm.
Unhook rubber boot from the so-
lenoid housing but leave con-
nected to plunger.
Loosen lock nut. Place Engine
Control Switch in Auto position.
Turn throttle rod and plunger un-
til engine runs at idle speed.
Tighten lock nut.
Hook rubber boot back onto so-
lenoid housing.
.
Be sure solenoid plunger
pulls all the way in ("bot-
toms") when energized.
Weld/Power Speed
Adjustment
.
Weld/power speed adjust-
ment must be done by the
engine manufacturer's fac-
tory authorized
agent.
Tampering with adjustments
other than shown may affect
engine warranty.
!
Stop engine.
and
OM-4433 Page 39
service
803 563-G