Miller Electric Big 40 CAT - Manual (Page 52)

OM-4406 Page 46 Return To Table Of Contents
9-6. Adjusting Engine Speed
802 490 / 802 538-A
After tuning engine, check engine
speed with tachometer or frequen-
cy meter. See table for proper no
load speed. If necessary, adjust
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.
Idle Speed Adjustment
1
Throttle Rod/Plunger
2 Locknut
Loosen locknut. Place Engine Con-
trol switch in Run/Idle position.
Turn throttle rod and plunger until
engine runs at idle speed. Tighten
locknut.
.
Be sure solenoid plunger pulls
all the way in (“bottoms”) when
energized.
.
If necessary, move linkage to
other hole in bracket or move
cotter pin to other hole in throttle
arm to set idle speed correctly.
Weld/Power Speed Adjustment
3
Engine Weld/Power Speed
Adjustment Screw
4 Locknut
Place Engine Control switch in Run
position.
Loosen locknut. Turn screw until
engine runs at weld/power speed.
Tighten locknut.
.
Do not set engine speed higher
than specified.
Y Stop engine.
1850 rpm max
(61.6 Hz)
1250 rpm
(41.6 Hz)
2
1
4
3
Engine Speed
(No Load)
If necessary, move
linkage to other hole in
bracket or move cotter
pin to other hole in
throttle arm to set idle
speed correctly.