The 196-7973 is a Revolution Speed Sensor (also known as an RPM or
Magnetic Sensor) used in Caterpillar (CAT) heavy machinery. It monitors
engine and transmission speed to ensure the machine operates at optimal
performance levels.
Common Vehicle Fitment
This sensor is a standard component for many "Dash B" and "Dash C" series
Caterpillar excavators and engines:
Excavators: E320, E200B, 312B, 315C, 317B, 318B, 320B, and 320C.
Engines: Caterpillar 3046 and 3066 diesel engines.
Key Specifications
Part Numbers: 196-7973, 1967973 (Interchangeable with 125-2966 and
178-6540).
Sensor Type: Magnetic revolution speed sensor.
Operating Temp: Rated for high-temperature resistance up to 120°C.
Terminal Type: Typically features a ring-style terminal or 2-pin connector
depending on the specific harness.
Installation & Troubleshooting
Direct Fit: Designed to match original factory specifications for a
"plug-and-play" installation.
Mounting: Usually located on the engine bell housing or flywheel housing to
pick up the speed signal from the ring gear.
Signs of Failure: Erratic RPM readings on the monitor, engine stalling, or
"limp mode" activation often indicate a faulty sensor.
Calibration: Aftermarket units
