Miller Electric Big 40 Diesel Owner's Manual download pdf (Page 35)

OM-477 Page 31

7-11. Adjusting Optional High Altitude Carburetor

Ref. ST-159 727-B / Ref. ST-115 155-A

 A too lean air-fuel mixture

can damage valves. Do not

adjust main adjustment

screw so air-fuel mixture is

too lean.

Carburetor can be equipped with an

adjustable main jet for operation

above 4000 ft (1219 m). Adjust car-

buretor as follows:

Start engine and apply nearly full

load to welding generator.

1 Main Adjustment Screw

2 Lock Nut

Loosen nut. Turn screw in until en-

gine falters (lean air-fuel mixture).

Turn screw out until engine runs

smoothly, then turn screw out an

additional 1/4 turn. Tighten nut.

 Stop engine.

Close door.

Tools Needed:

1/2 in

7-12. Troubleshooting

A. Welding

Trouble Remedy

No weld output. Check control settings.

Place optional Output (Electrode) Control switch in On (Hot) position, or move switch to Remote posi-

tion and connect remote contactor to Remote 14 receptacle RC3 or terminal strip 3T (see Sections

4-7, 4-8, and 5-1).

Check and secure connections to optional Remote 14 receptacle RC3 or terminal strip 3T (see Sec-

tions 4-7 and 4-8).

Disconnect equipment from 120 volt ac receptacles during start-up.

Have Factory Authorized Service Agent check brushes and slip rings, and field current regulator board

PC1.

Erratic weld output. Check and tighten connections inside and outside unit.

Use dry, properly-stored electrodes.

Remove excessive coils from weld cables.

Be sure connection to work piece is clean and tight.

Have Factory Authorized Service Agent check brushes and slip rings.

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Miller Electric Big 40 Diesel Owner's Manual Page 35