Troubleshooting & repair – Lincoln Electric WELDANPOWER SVM 113-A User Manual

Page 66

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ENGINE THROTTLE ADJUSTMENT TEST

(continued)

FIGURE F.12 - IDLE SPEED ADJUSTMENT SCREW LOCATIONS

5. ADJUST HIGH IDLE: With the Idler Switch

set on HIGH, the tach should read between
3700 and 3800 RPM.

a. If the engine speed is above 3800

RPM, turn the High Idle Increase
Speed screw counter-clockwise sev-
eral turns. Turn the High Idle
Decrease Speed screw clockwise until
the engine speed is between 3700 and
3800 RPM. See Figure F.12.

Next, turn the High Idle Increase
Speed screw clockwise until the
screw contacts the tab on the
Governor Control Lever. Do NOT
tighten the screw any further, as this
may cause the tab to bend. See Figure
F.12.

b. If the engine speed is below 3700

RPM, turn the High Idle Decrease
Speed screw counter-clockwise sev-
eral turns. Turn the High Idle Increase
Speed screw clockwise until the
engine speed is between 3700 and
3800 RPM. See Figure F.12.

Next, turn the High Idle Decrease
Speed screw clockwise until the
screw contacts the tab on the
Governor Control Lever. Do NOT
tighten the screw any further, as this
may cause the tab to bend. See Figure
F.12.

c. After the adjustments are made,

try to move the Governor Control
Lever. There should be no move-
ment. The two high idle speed
screws are designed to work
against opposite sides of the
Governor Control Lever tab so that
no movement (and therefore no
increase in speed) is possible.

6. ADJUST LOW IDLE: Using a piece of dowel

rod or a long screw driver, push the gover-
nor arm back until the Carburetor Throttle
Lever rests against the Low Idle Speed
screw. See Figure F.12. You can also push
the arm back with your hand, but this is not
recommended because you could be
burned by the hot muffler. Adjust the Low
Idle Speed screw until the engine speed is
2075 + 75 RPM.

Set the Idler Switch on AUTO. The engine
should go to low idle in about 12 seconds.

Use the 3/8" wrench to turn the adjustment
nut on the idler solenoid plunger, which
changes the amount of throw in the gover-
nor arm. See Figure F.13. for location of
the adjustment nut. Adjust the nut until the
tach reads between 2250 and 2500 RPM.

TROUBLESHOOTING & REPAIR

F-28

WELDANPOWER 125