Bachman 2-6-6-2 gear train slip

I see no early responses.  I had a similar issue on a 4-4-6-4 (Westside brass).  The rear driver gears wore down due to "high stresses" from trying to get the engine through 33" radius curves...it needs closer to 40".  It would have made it if I had been able to eliminate the tender-engine shorting on the too tight radii..but I think the strain damaged the gears...it is now on the "to service" line. 

Bachmann 2-6-6-2 gear train slip

Hi,

Yes, I had a similar problem - twice. The first time one of the gears in the front gear train lost a tooth, causing the gear train to bind. I contacted Bachmann, who supplied me with two assembled gear trains front and rear, including the wheels (I had numerous emails with Bachmann in convincing them to send me parts). I opted to open the new assemblies and remove the gears that I needed. I ended up replacing two gears. About 8 months later, the same happened to the rear gear train, and I had to replace three gears!. Luckily I still had enough spares. I must say, the new batch of gears seem to be of a better quality plastic, as the first run seems more brittle and prone to breakage.

But I am taking no chances with the loco anymore, and it does helper services at the rear of a 22 car coal train, with a LifeLike 2-8-8-2 at the point. I have set the Bachmann (I installed a Tsunami at the time) to a very low BEMF, so as not to put too much strain on the gears, but still makes the difference in getting the train up 2.5% grades. I live in Cape Town, South Africa, so getting spare parts is not so easy

Xander

Early or Later Model?

Being that he installed the sound system I wonder if this was an early edition of this loco, or a later addition that came with DCC and sound installed.??

Sounds like a broken gear or

Sounds like a broken gear or a drive shaft yoke that came unhooked depending on where the motor is located

Only 2 persons had such problems?

So only 2 people on this forum have experienced this slipping problem with the Bachmann 2-6-6-2?

That's pretty encouraging.

Bachmann

They do have a web site with forums, diagrams, parts lists and reps online. Google Bachmann forums. I watch the forums quite a lot.

Rich

Another gentleman's

Another gentleman's experiences with Bachmann 2-6-6-2

https://bigbluetrains.com/showthread.php?tid=8229

You've been Bachmanned!

4-8-4 northern's

@Scott,

Does this hold true for the later versions of their 4-8-4 northern's?

I have several of their Santa Fe northerns that seem to be very good runners, and pullers. They appear to be well detailed, and should look really good after weathering.

Bump. Sorry, I know it's a

Bump. Sorry, I know it's a little early for Halloween undead threads, but I'm actually having this issue with our club's 2-6-6-2. I believe it's the USRA model, not the later C&O.

If you all remember Back in May, I had a thread asking about swapping in an oil burning Vandy to make it more of a west coast unit...much as the OP in this thread did. Well, in one of our club donations, we got 2 complete Bachmann DCC ready oil burning Vandy tenders. So I thought now was the time. I pulled the loco out of storage and put it on the test track.

First thing I noticed is a lurch in the rear drive set. This is either out of quarter (I hope) or a bad gear.

But then, running it a bit more, the front drive set started slipping and while examining it, the rear lurching set also occasionally slipped.

I'm at a bit of a loss now. The club doesn't want a bunch of science projects sitting in the round house. we want runners. And while the $100 it would cost to buy a pair of bachmann drive lines (assuming they are right for this model and not exclusive to the C&O version) is much less than the cost of a new one, it would still be more money than we'd want to spend.

So, I'm wondering, in the ensuing 2 years has anyone figured out what gear to replace in these and is it something a mid-level modeller could accomplish? Given some of the links previously in this thread indicate NWSL was of no help, I'm at a loss. 

H-4/H-5 2-6-6-2's

I have several of them, and while I find that they're a bit light and not the greatest pullers out of the box, they have been very reliable for me. The mechanisms are the same between the C&O H-4 and the nominally USRA model (which the C&O rostered as H-5). They run smoothly and my guess is that yours is as you suspect slightly out of quarter. You should also look carefully at the valve gear. I had a very slightly bent eccentric link cause a hitch. It was on another H-4, but a brass one. The brass model's tolerances are tighter, so it took almost no bend to create the problem, but slightly more bend in some of the Bachmanns could cause similar effects.