7-9. Adjusting Engine Idle Speed

 

 

 

 

 

 

Start engine. Place Engine Control

 

 

 

Switch in Run/Idle position.

 

 

 

1

Solenoid Bracket Screws

2

5

 

2

Throttle Arm

 

 

1250 rpm

3

Idle Speed Screw

 

 

4

Throttle Stop

 

 

 

 

 

 

Loosen bracket screws and move

 

 

 

arm so screw touches stop. Do not

 

 

 

release arm. Turn idle speed screw

 

 

 

to obtain 550 rpm.

 

 

 

5

Idle Mixture Screw

 

 

 

Turn mixture screw counterclock-

 

 

 

wise until engine falters, then turn

 

 

 

screw clockwise until engine runs

 

 

 

smoothly.

 

1

 

Turn idle speed screw to obtain

 

 

 

1250 rpm.

 

 

 

6

Solenoid

 

 

 

7

Plunger

 

6

 

Slide solenoid inside bracket so

 

 

 

plunger bottoms in solenoid. If nec-

3

7

 

essary, shim solenoid/bracket to

 

 

prevent linkage from binding. Do

 

 

 

 

 

 

not readjust idle speed screw when

 

Right Side

 

adjusting solenoid.

 

 

 

 

 

 

 

Tighten bracket screws. Release

 

 

 

throttle arm. Recheck idle speed

 

Tools Needed:

 

and readjust if necessary.

 

 

Y Stop engine.

 

 

 

 

 

 

Close door.

4

1/4 in

 

 

Ref. ST-115 155-A

 

 

 

 

7-10. Adjusting Governor Sensitivity

3

2

1

Tools Needed:

1/2 in

.Governor sensitivity may re- quire readjustment if weld speed is adjusted. Weld speed must be readjusted if sensitivity is adjusted.

Be sure carburetor and link- ages are adjusted properly be- fore adjusting sensitivity.

Start engine. Apply and remove load.

1Locking Nuts

2Sensitivity Adjustment Screw

3Governor Spring

If engine is slow to pick up load or rpm drops under load, adjust spring tension as follows:

Loosen top nut and tighten bottom nut to move screw down. Tighten nuts.

If engine hunts with or without load, adjust spring tension as follows:

Loosen bottom nut and tighten top nut to move screw up. Tighten nuts.

YStop engine.

Close door.

Ref. ST-115 155-A / Ref. ST-159 728-A

OM-477 Page 30

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Hobart Welding Products OM-477 manual Adjusting Engine Idle Speed, Adjusting Governor Sensitivity

OM-477 specifications

Hobart Welding Products has long been recognized for delivering high-quality welding equipment tailored to the needs of both professionals and DIY enthusiasts. Among its distinguished offerings is the OM-477, a versatile multi-process welder designed to excel in a variety of welding applications. This machine integrates an array of features and technologies that cater to both novice and experienced welders.

One of the defining characteristics of the OM-477 is its multi-process capability, which allows users to perform MIG, TIG, and stick welding with ease. This flexibility makes it an ideal choice for a wide range of projects, from automotive repair to light fabrication tasks. The seamless transition between processes is facilitated by a user-friendly interface that simplifies the selection and adjustment of settings, ensuring a smoother workflow.

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