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TROUBLESHOOTING AND REPAIR | ||
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ENGINE RPM ADJUSTMENT PROCEDURE (continued)
FIGURE F.3 – VIBRATACH METHOD
HIGH IDLE ADJUSTMENT
LOW IDLE ADJUSTMENT
TOP VIEW OF ENGINE
Vibratach Method
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A Vibratach is used to measure the vibrations caused by the running engine. It can be positioned anywhere where the engine vibration is reasonably strong.
1.Read and understand the manufacturer’s instructions for the Vibratach.
2.Start the engine and place the idle switch in the “HIGH IDLE” position. Make sure there is no load on the machine.
3.Position and adjust the Vibratach; is should read between 3700 and 3800 RPM.
4.Move the idle switch to the “AUTO IDLE” posi- tion and wait for the idle solenoid to energize, and the engine RPM to drop and stabilize at the low idle RPM.
5.Position and adjust the Vibratach; it should read between 2250 and 2500 RPM.
6.If either of the readings is incorrect, proceed to the Throttle Adjustment Procedure later in this section.