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Old 04-20-2017, 03:07 PM   #1
pilot2fly
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new vs old couplers

Hi all,

I have an older bachmann SD40-2 with couplers that are attached to the trucks (i.e. meaning when the trucks move so do the couplers) that will serve as a dummy locomotive.

I just got a new Bachmann SD40-2 with DCC today. The couplers are not attached to the trucks and don't move with the trucks, which is good. However, when I attach the two couplers, it seems the newer SD40-2 (left side of the photo) has it's coupler all the way to the right.

Is this going to be a problem when going through left hand turns?

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Old 04-20-2017, 03:38 PM   #2
Old_Hobo
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You're going to have to replace the old "horn hook" coupler with a new knuckle style coupler......the 2 different kinds were never meant to hook together....

Or, cut the truck mounted coupler off the truck, and install a knuckler couple and box on the frame on the old SD40....
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Old 04-20-2017, 04:06 PM   #3
DonR
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Do both couplers quickly center themselves
after you flick them?

If not you might want to exercise the slow one
a bit and perhaps blow in some dry lube.

Bachmann couplers use a plastic 'whisker' for
centering. They're just not as good as Kadee.

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Old 04-20-2017, 04:19 PM   #4
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DonR; I don't think you noticed in the photo that he is trying to couple an old horn hook with a kadee style coupler.....?
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Old 04-20-2017, 09:54 PM   #5
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Yup. That hook horn (what you call the "old" coupler) has to go.

Pick up a pair of Kadee's (check their website for the correct #) or Walthers ProtoMAX couplers and swap them out. You MIGHT get lucky, and be able to drop one in. Of not, you'll have to perform surgery as Old Hobo described.
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Old 04-20-2017, 11:24 PM   #6
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That's the info I was looking for. Thanks so much guys. Ordered 8 (2 packs) of the Kadee #142 knuckle coupler kits. I plan to chop off the truck-mounted couplers to make room and glue the Kadee gearbox to the bottom of the frame. I have quite a few freight cars with the old horn hooks so I'll be replacing those as well.
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Old 04-21-2017, 09:22 AM   #7
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You are doing the right thig. You are better off with body mounted couplers instead of truck mounted couplers. You may want to also get a Kadee coupler height gauge to make sure that the couplers align properly. You may have to shim up the coupler pocket to match the Bachmann locomotive.
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Old 04-21-2017, 12:36 PM   #8
lajrmdlr
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Get a Kadee 2-56 tap & die set from Kadee for drilling the holes for their couplers:
https://kadee.com/htmbord/page246.htm
Then buy 2-56 screws in boxes of 100 from places like McMaster-Carr. They sell for the same money for only 10-12 at an LHS.
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Old 04-21-2017, 06:13 PM   #9
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If possible, get a bottoming tap...
Otherwise, carefully grind off the end of a taper tap.
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Old 04-21-2017, 07:49 PM   #10
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Mixing couplers

A few years ago I discovered that the two coupler types would indeed couple together. I ran a test train to see how long it would go before a problem developed. Not long.
The Virginian hopper hit the basement floor. (That's why I used Tycos etc.)
I also installed guards on the edge of board after that. Ah, the good old days...
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