Miller Electric Big Blue 500 X, Big Blue 400P manual Adjusting Engine Speed, Engine Speed No Load

9-6. Adjusting Engine Speed

.To prevent solenoid damage,

be sure a 1/8 in (3 mm) gap exists between the engine low speed screw and throttle lever when the solenoid is

held in the energized position.

4

5

Engine Speed

(No Load)

1850 rpm max

(61.6 Hz)

1250 rpm

(41.6 Hz)

1

2

3

After tuning engine, check engine speed with tachometer or frequency meter. See table for proper no load speed.

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 − Weld Terminals Always On position.

1Low Speed Adjustment Screw

2Lock Nut

Standard Model Idle Speed Ad- justment

Loosen lock nut. Turn screw until engine runs at idle speed. Tighten nut.

Models With Automatic Idle Op- tion

3Throttle Rod Lock Nut

4Throttle Rod / Plunger

5Rubber Boot

Adjustment screw is not used to ad- just engine speed when automatic 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 sole- noid housing but leave connected to plunger.

Loosen lock nut. Place Engine Con- trol Switch in Auto position.

Turn throttle rod and plunger until engine runs at idle speed. Tighten lock nut.

Hook rubber boot back onto sole- noid housing.

.Be sure solenoid plunger pulls

all the way in (“bottoms”) when energized.

Weld/Power Speed Adjustment

.Weld/power speed adjustment

must be done by the engine manufacturer’s factory autho- rized service agent.

Tampering with adjustments other than shown may affect en- gine warranty.

YStop engine.

803 606-C

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