2055 Runs then stops!!

[Curmudgeon]

I have seen enough side rod bolts (hold the long rods that connect the wheels together on one side into the wheel) on the front driver back out, and because of load, coriolis effect, and curvature, often forward the drivers move to one side, reverse the other, you can have a loose bolt jam against the back of the crosshead (crosshead being the black part the silver main rod attaches to, and has as part of it the piston rod which goes into the cylinders, and I think on a 2055 the clapper arm for the smoke unit strikes). So, run it until it stops. Then, check main rods for looseness. Then, check crossheads for looseness. Find a tight crosshead, look behind it (should be able to see through the bits with a good light), see if a crankpin bolt is near the crosshead, if so, carefully, so as not to dislodge the jam, lift engine and turn over, and inspect carefully.

On the armature, remove the brushplate and brushes, look carefully for anything adrift in armature poles or field, but my bets are crankpin bolt.

[srguy]

I have a sense that your comment about crud in the armature could be the culprit. I'll have to break it down and inspect it. I did look at the drivers and everything seems to be in order. I does seem a little perplexing that it runs in reverse and doesn't jam at all in that direction. You would think that if crud was in the armature that it would jam in either direction.

thanks Jim

[EIS2]

Check the side linkage ad see if it is jammed or loose.  You could also remove the side linkage, one piece at a time, and see if the engine eventually frees up.  If removing the linkage does not correct the problem, the most likely problem is a foreign object in the gears. 

Additionally, the 2055 has Magnetraction and may have picked up a metal object that is jamming the mechanism.

Good Luck...

Earl

[Curmudgeon]

First off, stop running it until you know for sure.

It could be a screw, washer chunk of crud, floating around in the armature occasionally jamming in the field pieces.

Being only one direction, I'd still carefully go over all the gear teeth, use an Xacto blade and probe each gear all the way around, just to make sure.

Since you say it stopped, jammed, but moved freely in reverse, I don't think smoke flapper, but when this happens, see if the main rods are tight......rattle them.

I have seen, in some models, the crankpin bolt on #1 driver come loose, and in one direction jam on the back of the crosshead.

Might look there, too.

Dave

 

[srguy]

I was running my 2055 PW steamer last eveing and admiring how it performs so well after all these years until it came to a halt with a loud buzz. I shut down the power and and found that the drive wheels jammed however I was able to move them freely in reverse. I removed the shell and didn't find anything obstructing the drivers. As I moved the wheels forward they would jam ... again no obvious obstructions. I put the unit back on the tracks and ran it in reverse no problems. Would occaisionally jam in forward but eventually it seemed to fee up and ran without issues. I reinstalled the shell and ran it around a few times apparently fixed but then it jammed again. At that point I left it .... I have no clue what's causing this jamming. Would appreciate any suggestions to troubleshoot.