lionel vision line big boy derail vids

Looks like the right front driver is riding over the point rail instead of being guided along it's inside edge into the curve

can you shoot a video from the right side view then we should be able to see exactly where and what wheel hops off first!

alan

Does the front 8 wheel set move freely maybe binding or some screws loose in the frame. I would you your locomotive upside down and use your hand and see if the front assembly moves freely with out any binding left to right movement. either that or possible a switch problem, does it jump of the track on other switches making the exact same left hand turn?

Alan

Are your points on you switch tight and not being picked. Most switches should have their points tightly secured. As an employee of the New Hope & Ivyland R.R., specifically a fireman on # 40 consolidation,whenever you throw a switch manually, you always checked the points before signaling the engineer to advance. NO matter what direction. It's hard to tell what's going on by the angle of your pic. Look at or take a pic of the other side and post it. Your best bet is to get your nose right in there & observe.

                                  Steam Forever

                                      John

Are your switches 072?

            John

Here is a video of a guy fixing 072 lionel fastrack. 

Flip the locomotive over. look at the pilot wheels and the slot the screw slides in. the pivot maybe catching on a burr and not letting the boiler slide back and forth.

I ran a small file and took any burrs out, then added a SMALL amount of lithium white grease on the spring face and pivot guide . I also took the spring and double check to make sure it was applying enough force on the front pilots, and not binding up.

O72 is hard on this locomotive. My EM-1 does the same thing...

Get out the mics and measure the gauge on the inside of the front pilot wheels and compare to trailing truck gauge and/or the drivers.

I find that they set the pilot wheels a little narrow sometimes. This allows the flange to roll over the point.

Gently spread them, it's only a small amount that makes the difference.

Sandjam's switch check is also good.

Hard to tell from those poor videos, but after several viewings, I'm pretty sure the pilots are making the curve and the drivers are not.

I vote for making the point rails flush to the outside rail when they switch. I had several 072 Fastrack switches that needed adjustment as per the chessie1971 video.

I also think it's not the pilot truck, but the front engine that is going off.  The first driver axle is riding up the switch points.

I completely agree with Chessie1971.  Check all your fastrack switches, new and old as I've found this issue on many switches in number curvatures.  My "fix" approach is the same as in the video with the exception that I apply it in a different area.  I find where the point is making contact with the outside rail, then "un-curve" it from there which changes the angle so the end of the point makes contact.  I adjust a little at a time, which allows me to watch the point of contact move toward the end of the point.  QA/QC.

My switches have been adjusted.  I have the Challenger by Lionel vision line and it goes thru switches forward and backward without problems.  Engine has problems.