ARM AS-SUPPORT 3833376 - Caterpillar

Illustration 1 g00760464Fixed head sensors (if equipped)
Illustration 2 g00293337The fixed head sensor has a threaded end, and screws directly into the flywheel housing.
Remove the speed sensor (1) from the housing. Check the condition of the plastic end of the speed sensors for wear and/or contaminants.
Clean the metal shavings and other debris from the face of the speed sensors.
Install the engine speed/timing sensor. Slip head sensors (if equipped)
Remove engine speed/timing sensor (1). Inspect the condition of the end of the magnet. Look for signs of wear and contaminants.
Clean any debris from the face of the magnet.
Illustration 3 g01115363
Check the tension of the slip head. Gently extend the slip head (2) for a minimum of 4 mm (0.16 inch). Then push back the slip head. When the slip head has the correct tension, at least 22 N (5 lb) of force is required to push in the slip head from the extended position.
The sliphead must be fully extended when the speed/timing sensor is installed so that the sensor maintains the correct clearance with the speed-timing wheel. If the correct clearance is not maintained, the signal from the sensor will not be generated.Do not install the sensor between the teeth of the speed-timing wheel. Damage to the sensor would result. Before installing the sensor, ensure that a tooth of the wheel is visible in the mounting hole for the sensor.
Install the engine speed/timing sensor.
Ensure that a tooth on the speed-timing wheel is visible in the mounting hole for the sensor.
Extend the slip head (2) by a minimum of 4 mm (0.16 inch).
Coat the threads of the sensor with 4C-5597 Anti-Seize Compound. Note: The slip head is designed to contact a tooth during the first revolution of the speed-timing wheel. For the maximum allowable clearance between the slip head and the tooth, refer to the engine's Specifications manual.
Install the sensor. Tighten the locknut to 40 5 N m (30 4 lb ft).