replacing wheelsets in a hornby cl.71

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windcutter9f
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replacing wheelsets in a hornby cl.71

Postby windcutter9f » Sat Apr 18, 2020 12:03 pm

Hi guys,can any one tell me how to remove the wheelsets on a Hornby Cl.71?.There is a cross head screw in the retaining plate but i am a a bit loath just to unscrew it without being familiar with this loco.

Ray.

Bigmet
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Re: replacing wheelsets in a hornby cl.71

Postby Bigmet » Mon Apr 20, 2020 10:21 am

Looks like you have to pioneer the path! I know there is no diagram available, but have you tried looking for others from Hornby''s most recent BoBo types for any hints - I'd try the 87 first as it is another recent release.

(Not seen a screw under the bogie of a modern centre motor BoBo, and am no use at all, not only not owning this specific model, but not having any Hornby BoBo to look at as they have largely abdicated this field in favour of Bachmann, Heljan and Dapol! Pretty amazing that I have all the BoBo types I need with modern centre motor drives: 15, 16, 20, 21, 23, 24, 26; and zero involvment from Hornby.)

Personally I would just undo the screw and see what happens, it's only a kit that happened to be assembled in a factory, and it will go back together again.

windcutter9f
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Re: replacing wheelsets in a hornby cl.71

Postby windcutter9f » Fri Apr 24, 2020 3:48 am

Thanks,i havn`t got around to it yet.The reason i want to remove one of the keeper platesis to fit a Marklin skate to run on my Dublo 3 rail layout.There`s a serious shortage of SR locos in 3 rail,i have successfully converted a Hornby 2BIL & a 2HAL along with a Bachmann 4CEP.


Ray.

Bigmet
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Re: replacing wheelsets in a hornby cl.71

Postby Bigmet » Fri Apr 24, 2020 10:07 am

You are at something of a disadvantage when it comes to new three rail introductions. That you have successfully converted others is impressive, when it is considered that no design effort is given to providing for the possibility of a centre 3rd rail skate. Best of luck with the 71, and do post how you get on with it.

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Dalerailman
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Re: replacing wheelsets in a hornby cl.71

Postby Dalerailman » Fri Apr 24, 2020 8:15 pm

There is a screw on the underneath of each bogie as you mention, usually there is clips at either end of the bogie aswell be careful and should do no damage

windcutter9f
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Re: replacing wheelsets in a hornby cl.71

Postby windcutter9f » Sun Apr 26, 2020 12:06 am

Managed to remove the keeper plate,now the fun begins :) .

Ray

windcutter9f
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Re: replacing wheelsets in a hornby cl.71

Postby windcutter9f » Wed Apr 29, 2020 2:31 pm

Further to the Hornby E5000 conversion,progress so far.One more bogie & p/UP to make then to sort out the wiring.I`d like to keep the lights working.


20200429_122716.jpg



Ray

Bigmet
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Re: replacing wheelsets in a hornby cl.71

Postby Bigmet » Thu Apr 30, 2020 12:36 pm

Neat job. Once it has both skid pick ups and all eight wheels for current collection that should be a solid performer.

If I may, what exactly does the crosshead screw on the bogie underside secure? I have not previously seen a construction like this on any centre motor both bogies driven mechanism.

windcutter9f
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Re: replacing wheelsets in a hornby cl.71

Postby windcutter9f » Thu Apr 30, 2020 11:44 pm

The cross head screw held down the bogie frame,why i don`t know the plastic clips at at each end of the keeper plate held it tightly enough.

ray.

Bigmet
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Re: replacing wheelsets in a hornby cl.71

Postby Bigmet » Fri May 01, 2020 10:36 am

Thanks for that information. With every design of RTR OO centre motor with twin bogie drive model out of China I own or have seen, having all clip together assembly of the bogies and gear towers, (about 20 specimens from five manufacturers) that's something of an unexpected 'deviation'. Always useful to know what's out there against the day a friend appears with 'My class XX Bumbler isn't running very well'.

windcutter9f
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Re: replacing wheelsets in a hornby cl.71

Postby windcutter9f » Fri May 01, 2020 11:51 pm

Well,it works(sort of) ,it`s a bit stuttery at the moment because i havn`t got all the wheels connected together for the return path but the directional lighting works.One of the other annoyaces is that the moulded outside 3rd rail collectors slightly lift the loco off the rails on one or two 3 rail electric point motor covers.I have to admit that the standard of quality control as quite shocking,two of the wipers on the backs of the wheels didn`t even make contact,I may have to remove the keeper plate again.

Ray.

Bigmet
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Re: replacing wheelsets in a hornby cl.71

Postby Bigmet » Sat May 02, 2020 10:36 am

That's progress and you do know how to fix it all. Clearly the dummy 3rd rail collector assemblies will have to be cut back to provide clearance. (I have been surprised at how little trouble has been reported relating to these, from the several Southern 3rd rail models now available. I thought there would be significant numbers of fouling reports.)
windcutter9f wrote:...,two of the wipers on the backs of the wheels didn`t even make contact, I may have to remove the keeper plate again.

When we first started to get 'much better RTR OO' out of China from both Bachmann and Hornby now twenty years past, and then Heljan, this was a frequently reported complaint online. It took a few years, but by about 2006 the manufacturers had raised their game in this and other minor assembly related deficiencies, and the pick up wiper positioning was largely trouble free for several years.

But I have noticed it's now back, and suspect this is due to the various 'turbulences' that saw many of the skilled workforces disrupted, disbanded and redistributed into different organisations over the past half dozen years. I have resumed careful inspection of new purchases for positive pick up wiper contact maintained throughout the whole side to side movement of the wheelset, and have to adjust them to achieve this on most models. (I take the 'robust' attitude that provided the parts are properly designed and manufactured that's all the difficult work done for me, a little tweaking to optimise performance is acceptable: and in any case I usually dismantle the first example of any all new model that matters to the layout operation to assess design and assembly with respect to likely longevity. That's why it is handy to pick up information on new features in assembly that I haven't yet seen!)

What I see in some recent designs are attempts to simplify the assembly process by redesign to eliminate soldering and any need to adjust components. The result, several models with no pick up wipers but instead half axles and pick up through the bearings*, combined with more 'sprung contacts' for transmission of track supply from collector to decoder socket. While I can understand why this is done, it isn't what I want, and 'rearrangements' to restore pick up wipers (if required) and make all connections soldered are the plan.

*It isn't all downside, Bachmann's method of pick up via pinpoint bearings is the optimum method, pick up with no incremental friction, and I hope they will employ it more widely than just MU's, on steam loco tenders for example.

windcutter9f
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Re: replacing wheelsets in a hornby cl.71

Postby windcutter9f » Sat May 02, 2020 1:32 pm

Yes,bachmann seem to have got it right,here`s a (rather shaky,down to ageing i guess) video of my Bachmann 4CEP conversion.

https://www.youtube.com/watch?v=ZGk-0CGBahY


The E5000 is suffering teething problems,the collectors are too far apart & it stalls on a point leading on to a diamond crossing .Onwards i go!!!.

Ray.

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Re: replacing wheelsets in a hornby cl.71

Postby Bufferstop » Sat May 02, 2020 1:43 pm

(I have been surprised at how little trouble has been reported relating to these, from the several Southern 3rd rail models now available. I thought there would be significant numbers of fouling reports.)

The difference is the point motor covers on HD 3 rail track, they are substantial chunks of plastic. They may have been the reason that the shoes were made removable on HD's 3 rail Southern Region EMU.
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windcutter9f
Posts: 80
Joined: Fri Nov 20, 2015 3:37 pm
Location: Northampton

Re: replacing wheelsets in a hornby cl.71

Postby windcutter9f » Sat May 02, 2020 7:36 pm

The point motors on Dublo 3 rail electric points are actually die castings,in all fairness,i shouldn`t think for one moment that it crossed their minds that some of us would be running stock that was never intended on this track.The dublo EMUs of which i have at least five never suffered from hitting anything,the shoe beams were made as a seperate item soThat they could turn an SD suburban coach bogie for the driving trailer bogie.This is my hornby 2BIL that i converted about 2 years ago.

https://www.youtube.com/watch?v=B2mET69DGAM
Ray.


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