Re: Torsion Level Problem

Posted by HH56 On 2012/10/12 22:50:13

It was my understanding that they were more reliable than the 55.

The switch mechanisms are virtually the same 55-6. The difference is external. The 55 had 3 screw type terminals exposed and subject to corrosion. On the 56 box those 3 terminals were a different type and enclosed in a weather tight compartment. There were two additional tie point terminals for the revised limit switch connections also in the enclosure. When 55 switch stock ran out, there was a kit consisting of a short wire harness to splice on the old loom to adapt the 55 cars to 56 switches with the different terminals.

The different weatherproofed limit switches and relocated solenoids so very little of the electrical was exposed to the elements is the major difference in reliability between 55-6. One problem with the 56 arrangement was the limit switch near the driveshaft was subject to damage from road debris and the wiring where it solders into the switches can be a bit delicate and break from vibration. The switch plungers have also been known to stick when actuated.