Miller Electric Big 40 WG, Owner'S Manual

Page: 42 / 80

OM-4405 Page 38
8-6. Adjusting Engine Idle Speed
802 731 / Ref. 115 155-A
Stop engine and let cool.
Engine idle speed is factory set and
normally should not require adjust-
ment. After tuning engine, check
engine speed with tachometer or
frequency meter. See table for
proper no load speed. If necessary,
adjust idle speed as follows:
Start engine and run until warm.
On CC Models, place Stick/TIG
switch in Stick position.
On CC/CV models, turn Process/
Contactor switch to Stick – Elec-
trode Hot position.
1 Solenoid Bracket Screws
2 Throttle Arm
3 Idle Speed Screw
4 Throttle Stop
Loosen bracket screws and move
arm so screw touches stop. Do not
release arm. Turn idle speed screw
to obtain 550 rpm.
5 Idle Mixture Screw
Turn mixture screw counterclock-
wise until engine falters, then turn
screw clockwise until engine runs
smoothly.
Turn idle speed screw to obtain
1250 rpm.
6 Solenoid
7 Plunger
Slide solenoid inside bracket so
plunger bottoms in solenoid. If nec-
essary, shim solenoid/bracket to
prevent linkage from binding. Do
not readjust idle speed screw when
adjusting solenoid.
Tighten bracket screws. Release
throttle arm. Recheck idle speed
and readjust if necessary.
Stop engine.
Close door.
Tools Needed:
1
2
3
4
5
6
7
1/4 in
1850 rpm max
(61.6 Hz)
1250 rpm
(41.6 Hz)
Engine Speed
(No Load)