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badun
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 Posted - September 22 2007 : 11:50:51 AM
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Forgive my improper use of terminology and please educate me! My Bachmann GWR Castle class locomotive has trouble negotiating elevated curves. It appears the front truck, which is suspended by a spring and has a good deal of side-to-side float, becomes unloaded in the curve (I've also noticed this in non-elevated curves). I bought the locomotive used and it's my first steam engine so I don't know the proper front end setup. The spring can be adjusted by a screw, but it has little effect on the resistance and rebound rate. It appears to my untrained eye that the spring doesn't do enough to maintain wheel contact on the track, leading to derailment. Is there a schematic or tuning guide available that will help me get this right?
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 Posted - September 22 2007 : 12:22:02 PM
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Here is a website that might help with your front "truck" on the Bachmann GWR
http://www.gwr.org.uk/pro94xx.html
roger brown
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Posted - September 23 2007 : 05:40:31 AM
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hi badun is that the castle you got with the harry potter set,by the way they are called pony trucks?here in uk ken
Edited by - catfordken on September 23 2007 05:41:50 AM
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Posted - September 23 2007 : 07:45:46 AM
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Ken:
I've seen the term "pony" truck used on the Sunny side of the Atlantic too.
-G
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badun
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Posted - September 23 2007 : 12:25:15 PM
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Yes, that's the one. I thought I might get more sympathy and responses if I didn't let on that it's a kid's train. [:0)]
I will try and get a picture of it posted today showing the degree of movement, it just doesn't seem right to me.
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Posted - September 23 2007 : 1:17:43 PM
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| hi bachmann locos are very flimsey on front ponies i would try weighteng it,after all its only plastic (100%) try replacing wheels with metal insulated ones,ken
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badun
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Posted - September 23 2007 : 2:10:49 PM
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| Can't get a clear image, but I will try to find a heavier weight spring and play around with adding ballast to the pony. Thanks for the advice and for educating me. [^]
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Posted - September 23 2007 : 4:15:11 PM
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| here in uk when those locos were in use did not have slanted/tilted/banked turns as we tried where possible to go as straight as possible,and can only presume that they scaled down the locos to run as per original,but they should take normal curves ken
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badun
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Posted - September 23 2007 : 10:15:40 PM
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| Yes, it did occur to me that I may be asking the engine to do something for which it wasn't intended. I'll still explore making the pony truck more stable since it has a tendency to derail even on flat curves.
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midmo1
Little Six
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Posted - December 20 2007 : 7:44:24 PM
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Hi Guys
A friend asked me to fix his Harry Potter steamer...I cleaned the wheels...ran it for a few seconds....then it registered a dead short on the power pack....can you guys direct me to a diagram/scematic...or offer any tips...
Thanx
Ted
mid-mo
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Posted - December 20 2007 : 8:26:40 PM
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| Look to see that all insulated wheelsets are on one side, usually with a plastic insert on one axle. Sometimes the pilot, trailing and/or tender trucks will get turned around.
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midmo1
Little Six
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Posted - December 21 2007 : 06:21:32 AM
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Mornin
I havnt taken it apart yet....and I doubt anyone else has either...its been in the closet for while....I'll tear into today
Thanx
Midmo
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obtrey
Little Six
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Posted - December 21 2007 : 12:29:39 PM
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I've had some luck on other manufacturers locos with a similar problem by removing the screw that holds the truck spring in place and carefully stretching the spring a little ( I mean just a little) it helped on some to keep more downward pressure on the truck and keep it in contact with the rails. It sometimes helps also to be sure the wheels are clean ( not pitted). Not having the loco you describe I am only relating my experiences with a similar problem. It didn't always work but when it did work the loco ran well (better). AHM Generals come to mind along with some Tyco ( Pacifics if I remember correctly) and a few others that use the front trucks as power pick ups. Just don't stretch the spring too much just enough to help keep the downward pressure for the truck and keep it in contact with the rails. May or may not work as I have had varying luck. Not having or seeing the loco you have it is only a suggestion.
Bob
In Malfunction Junction:
When all else fails get a bigger hammer.
Edited by - obtrey on December 21 2007 12:55:17 PM
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