Miller Electric Big 40 CAT Adjusting Engine Speed, Engine Speed No Load, Idle Speed Adjustment

9-6. Adjusting Engine Speed

Engine Speed

(No Load)

1850 rpm max

(61.6 Hz)

1250 rpm

(41.6 Hz)

3

4

If necessary, move linkage to other hole in bracket or move cotter pin to other hole in throttle arm to set idle speed correctly.

2

1

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

1Throttle Rod/Plunger

2Locknut

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

3Engine Weld/Power Speed Adjustment Screw

4Locknut

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.

YStop engine.

802 490 / 802 538-A

OM-4406 Page 46 Return To Table Of Contents