Miller Electric 250 C. Making Engine Speed Adjustments

.A complete Parts List is available at www.MillerWelds.com
OM-217 455 Page 37
C. Making Engine Speed Adjustments
Ref. 804 250-A / 801 963
.Before adjusting engine speed, verify
throttle solenoid is installed properly
(see Section B on previous page).
Check engine speeds with a tachometer
(see table). If necessary, adjust speeds as
follows:
Start engine and run until warm. Turn V/A
control to max.
Adjusting Idle Speed
Turn Engine Control switch to Run/Idle
position.
1 Throttle Solenoid
2 Idle Speed Jam Nut
3 Plunger
4 Throttle Link
5 Throttle Lever
Loosen jam nut. While holding throttle link
with a 3/8 in wrench, turn plunger clock-
wise to increase idle speed or counter-
clockwise to decrease idle speed.
.After adjusting idle speed, verify the
throttle link is parallel with the throttle
lever. If necessary, loosen the idle
speed jam nut and reposition the
throttle link.
.Do not twist solenoid boot while ad-
justing engine speed.
Tighten jam nut.
Adjusting Weld/Power Speed
Start engine and run until warm. Turn V/A
control to max.
6 Weld Speed Jam Nut
7 Adjustment Screw
Turn Engine Control switch to Run posi-
tion. Loosen nut and turn screw counter-
clockwise to increase speed. Turn screw
clockwise to decrease speed. Tighten nut.
2375−2450 rpm
39.6−40.8 Hz
3675−3750 rpm
61.3−62.5 Hz
3/8, 7/16 in
10, 14 mm
Tools Needed:
2
3
67
1
Be sure throttle link
is parallel with
throttle lever.
Do not twist
solenoid boot
while adjusting
engine speed.
45
Idle
Weld/Power