Adjusting Engine Speed - Miller Electric Big Blue 602P Owner's Manual

9-5. Adjusting Engine Speed

Engine Speed
(No Load)
1850 rpm
Weld/Power
(61.6 Hz)
1500 rpm
Idle
(50 Hz)
Standard Models
1 2
Models With Automatic Idle (Optional)
4 5
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3
1
2
Y Stop engine and let cool.
Engine speed is factory set and
should not require adjustment. Af-
ter 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.
Standard Models
1 Adjustment Screw
2 Lock Nut
Loosen nuts. Turn screws out sev-
eral turns.
3 Speed Lever
Start engine and move lever until
engine runs at weld/power speed.
Tighten adjustment screws and
lock nuts.
.
Do not set engine speed higher
than specified.
Models With Automatic Idle
(Optional)
Idle Speed Adjustment
4 Throttle Rod/Plunger
5 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.
Weld/Power Speed Adjustment
6 Engine Weld/Power Speed
Adjustment Screw
7 Locknut
Place Engine Control switch in Run
position.
6
Loosen locknut. Turn screw until
engine runs at weld/power speed.
Tighten locknut.
.
Do not set engine speed higher
than specified.
Y Stop engine.
7
Close door.
Tools Needed:
802 168-C / 802 229-A / Ref. 202 705
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