Lincoln Electric CLASSIC III SVM 137-A Service Manual page 86

F-26
ENGINE THROTTLE ADJUSTMENT TEST (continued)
TEST PROCEDURE
Strobe Tach Method
1. Turn the engine welder OFF.
2. Unlatch, lift and secure the left side door.
Note that there are latches at both ends of
the door.
3. With a white or red marking pencil, place a
mark on one of the blower paddles. See
Figure F.8 for location.
4. Connect the strobe-tach according to the
manufacturer's instructions.
TROUBLESHOOTING & REPAIR
FIGURE F.8 - STROBE MARK LOCATION
STROBE
MARK
Classic III and IIID
5. Start the engine and direct the strobe-tach
light on the blower paddle. Synchronize it to
the rotating mark.
With the machine at HIGH IDLE the tach
should read between 1780 and 1810 RPM.
With the machine at LOW IDLE the tach
should read between 1325 and 1475 RPM.
F-26