My apologies to all for starting another thread on this subject, but a search of the threads didn't mention the specific problem I have come upon.

This kit was previously assembled by someone who really didn't know what they were doing. Nothing was broken, but parts were not tighened down, and some drive shaft gears were mounted improperly. I replaced all gears with NWSL parts and everything was going well during assembly. The gear box worked smoothly when I tested the motor on DC. The truck gears rotated smoothly when I tested them. I did remove all but one gear on the outer driveshaft. Nothing sticking or jamming, I was happy.

My next plan was to place each truck in turn on the frame and test the truck hooked up to the gearbox. This is where I found a little problem. The female end of the coupling that fits onto the truck worm shaft doesn't fit. The coupling has a hole diameter of 2.25mm and the truck worm shaft has a diameter of 2.15mm.

I must also mention that I have followed the advice of Garretfan at the following link: <!-- m --><a class="postlink" href="http://www.modelrailroading.nl/ProjectShay/ShayIndex.html">http://www.modelrailroading.nl/ProjectS ... Index.html</a><!-- m --> I do not have the book published by Oso. All aspects of the rebuild seem to be covered by Garretfan.

I have placed a call to NWSL to see if they have a solution to this problem, or have even encountered it before. No answer, so hopefully, they'll call me tomorrow. In the mean time, I thought I'd post this on the forums to see if anyone else had encountered this problem and had come up with a solution.

Again, my apologies for starting a new thread. Any suggestions will be gratefully received.

Roy

Is the worm shaft a MDC one, or a NWSL replacement? My advice is to replace the HUGE MDC universals with smaller ones from NWSL. I actually replaced the entire gearbox with a much smaller one from NWSL. The MDC one was almost so big that it scraped on turnout rails on my HOn3 version.

It's the MDC worm shafts that are in the trucks. I went to place the NWSL female cups on the end of the shaft and Lo and Behold, the hole in the NWSL cup was to large. Otherwise, everything has gone well with the conversion of MDC parts to NWSL parts.

Geared Wrote:It's the MDC worm shafts that are in the trucks. I went to place the NWSL female cups on the end of the shaft and Lo and Behold, the hole in the NWSL cup was to large. Otherwise, everything has gone well with the conversion of MDC parts to NWSL parts.

oh, i gotcha. Perhaps MDC changed the size of the shaft during production. I'd contact NWSL, because they make universals for many size shafts.