7-5. Adjusting Engine Speed

Engine Speed

(No Load)

Weld/Power

Idle

7

2

 

 

1

6

 

8

3

5

4

Tools Needed:

5/16, 7/16 in

 

Engine speeds have been factory

 

set and should not require

RPM

adjustment.

 

 

 

Start engine and check engine

1850

speeds with a tachometer. See

table for proper no load speeds. If

1250

necessary, adjust speeds as

follows:

 

Weld/Power Speed Adjustment

 

Place engine control switch in Run

 

position.

 

1

Lock Nut

 

2

High Speed Adjustment

 

 

Screw

 

Loosen nut and turn screw until en-

 

gine runs at weld/power speed.

 

Tighten nut.

 

Y Stop engine.

 

3

Throttle Arm

 

4

Solenoid

 

5

Solenoid Plunger

 

Push arm towards solenoid so

 

plunger is fully bottomed in

 

solenoid.

 

6

Lock Nut

 

7

Low Speed Adjustment Screw

 

Loosen nut and back out screw if

 

screw hits stop before plunger is

 

fully bottomed. Tighten nut and

 

release arm.

 

Idle Speed Adjustment

 

Start engine. Place engine control

 

switch in Run/Idle position.

 

8

Lock Nut

 

Loosen nut and turn throttle arm un-

 

til engine runs at idle speed. Tighten

 

lock nut.

Be sure solenoid plunger is fully bottomed in solenoid at idle speed to avoid damaging solenoid.

Y Stop engine.

Close door.

Ref. ST-154 952-C / ST-091 065-A

OM-474 Page 28

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Hobart Welding Products OM-474 manual Adjusting Engine Speed, Engine Speed No Load, Idle Speed Adjustment