Maintenance procedure for sensor failing to detects shifts
Gear sensor model: GSD5-12V 16.13-00019 but this will likely work with other models as well
The most likely source of issues is going to be lack of friction between the gear sensor cable and the internal wheel that rotates when the cable moves, or too much friction where the wheel rotates on the spindle caused by mud or debris preventing movement of the wheel.
Basics of maintenance
Loosen the shift cable bolt on your derailleur so there is play in the cable.
Unscrew the 2 silver screws that hold the cover on the shift sensor.
The cover has a tiny spindle on it, with a wheel attached to it. Theres a groove in that wheel that the cable rides in, and when you shift up or down the wheel moves. Im guessing there is a magnet in that wheel and a hall sensor in the body of the gear sensor that tells it when to cut power. The wheel is on the only exposed component under the cover. If the wheel gets gummed up, or the spindle gets sticky the cable will slide in the wheel groove rather than spin the wheel, and thats the problem.
All you need to do is pull the wheel off the spindle. Clean the groove on the edge of the wheel out with an old toothbrush, and put a tiny dab of grease into the hole of the wheel where it slides onto the spindle.
Slide the wheel back on the spindle with the grease and spin it around a few times. It should move pretty freely now. Then just snap the cover and wheel back onto the gear sensor body, making sure the shift cable sits in the wheel groove. Screw the cover back on.
Tighten up your derailleur cable holding bolt and you're good to go.
Below is a summary on how a customer cleaned and degreased the cable after using too much grease on the cable, thus preventing the cable from rotating the wheel.
Gear sensor model: GSD5-12V 16.13-00019 but this will likely work with other models as well
The most likely source of issues is going to be lack of friction between the gear sensor cable and the internal wheel that rotates when the cable moves, or too much friction where the wheel rotates on the spindle caused by mud or debris preventing movement of the wheel.
Basics of maintenance
Loosen the shift cable bolt on your derailleur so there is play in the cable.
Unscrew the 2 silver screws that hold the cover on the shift sensor.
The cover has a tiny spindle on it, with a wheel attached to it. Theres a groove in that wheel that the cable rides in, and when you shift up or down the wheel moves. Im guessing there is a magnet in that wheel and a hall sensor in the body of the gear sensor that tells it when to cut power. The wheel is on the only exposed component under the cover. If the wheel gets gummed up, or the spindle gets sticky the cable will slide in the wheel groove rather than spin the wheel, and thats the problem.
All you need to do is pull the wheel off the spindle. Clean the groove on the edge of the wheel out with an old toothbrush, and put a tiny dab of grease into the hole of the wheel where it slides onto the spindle.
Slide the wheel back on the spindle with the grease and spin it around a few times. It should move pretty freely now. Then just snap the cover and wheel back onto the gear sensor body, making sure the shift cable sits in the wheel groove. Screw the cover back on.
Tighten up your derailleur cable holding bolt and you're good to go.
Below is a summary on how a customer cleaned and degreased the cable after using too much grease on the cable, thus preventing the cable from rotating the wheel.
I took apart the gear sensor and cleaned out dried silicone cement and grease. I cleaned grease off the cable and centered the hub on the gear sensor wheel. Everything is working fine now.
I also added a section of bicycle tubing to cover and protect the gear sensor from water and mud.
There was no sign of water and mud in the gear sensor.
The grease I used (and completely cleaned out of the gearsensor) is fancy low-viscosity white grease I have for plastic-on-metal contact points on ski bindings. Seemed like it would be perfect gear cable grease, especially in Winter! Maybe too perfect for the gearsensor. The last thing was just making sure the hub on the wheel is
centered. That makes inserting the cable easier.
I also added a section of bicycle tubing to cover and protect the gear sensor from water and mud.
There was no sign of water and mud in the gear sensor.
The grease I used (and completely cleaned out of the gearsensor) is fancy low-viscosity white grease I have for plastic-on-metal contact points on ski bindings. Seemed like it would be perfect gear cable grease, especially in Winter! Maybe too perfect for the gearsensor. The last thing was just making sure the hub on the wheel is
centered. That makes inserting the cable easier.
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