Combines Testing shaft speed sensors

[tbran]

I do not know if it is proper or not but in the field I simply change one that is working for one that is not. Also check for proper setting of actuator and make sure it is actually spinning. The main reason for sensor failure is the breakage of the wire right at the place it enters the sealed housing. The vibration of the wires breaks them at the logical place. We have this problem on spreader shafts. We add a larger diameter sprocket or tabbed collar to 'fool' the monitor into thinking the shaft is spinning up to speed if the problem proves to bein the overhead module. On more than one occasion we have given up on harness tracing and ran separate wires from the sender to the overhead on older units.

 

[DAB]

Thanks! I'll see what I can find.

 

[tbran]

also shaft speed sensors are actually small 'generators'. If one will install a VOM set to milliamps, hooking up leads and take a object like a scewdriver and pass it rapidly in front of the pick up the VOM will read slightly. This is not an exact science because some folks strokes are better_faster than others. Some of us can't even make it read upscale anymore