Lincoln Electric CLASSIC I SVM134-A Service Manual page 69

F-25
ENGINE THROTTLE ADJUSTMENT TEST (continued)
IDLER
ROD
Adjust Low Idle
a. Make sure there is no load on the machine.
b. Set the Idler switch to AUTO and wait for the
engine to change to low idle speed.
c. Check the alignment of the idler rod so that
the plunger can move freely.
d. Using the 7/16" wrench, loosen the idler rod
locking nut. This is located on the idler rod
between the carburetor ball joint and the
idler solenoid. See Figure F.9.
e. Adjust the idler rod stickout from the ball
joint to set the low idle speed to the bottom
of the range (1000 RPM). The flattened por-
tion of the idler rod must be vertical. This
ensures free pivoting of the idler rod in the
idler solenoid plunger. To achieve this, turn
the idler rod into the ball joint (no more than
one-half turn).
TROUBLESHOOTING & REPAIR
FIGURE F.9 – LOW IDLE ADJUSTMENT
LOCKING
NUT
CLASSIC I
SPEED
ADJUSTMENT
SCREW
f. Tighten the locking nut to the ball joint. The
low idle RPM should now be slightly less
than the bottom value of the range.
g. Using the speed adjustment screw on the
carburetor, set the low RPM to within the
range (1000 - 1050 RPM). See Figure F.9.
F-25