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7157 Views 12 Replies 6 Participants Last post by  Ruffnut Thorston
Can anybody direct me to a site that shows how to do this?
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As I've no idea what a Hornby R751 is, all I can do is hope that this page on Bromsgrove Model's website has the information you need.

David
The R.751 is the Hornby Railways Class 37, or Type 3, Co-Co Diesel Electric Locomotive.

HTH
Thank you Sarah.
Regards, Mikem
The R.751 "Class 37" was fitted with two types of motor bogie.

The earlier (1967 - 1973(?)) is the "standard" Tri-ang 3 Pole "Open Frame" Motor bogie. The Later version is the "clip in" "Ringfield Motor" Bogie.

From my books, the earlier pattern looks to be a bit fiddly to convert to DCC.

As I understand it, you need to isolate the motor feed AND return from any connection to the track.

It looks like the one piece pick ups (copper?) actually touch the motor brushes. So, you would possibly need to cut a small section away, or otherwise stop the contact with the brushes.

Then, the pickups would need to be connected to the feed and return wires to a DCC Chip, The Chip motor Feed and return wires would need to be connected to "clips" (Standard Tri-ang "brush clips", as used for the feed wire on X.04 motored Steam Locos.) which fit between the brush and the brush retaining "spring" clip. The "return" side of this spring would require an insulating sleeve, the same as is fitted on the "Positive" side.

(All very "basic", but I don't have any DCC stuff. I have just read a bit!
)

The "Ringfield" motor pickups are different. (But the same "Isolate the Motor from the track" would apply.)

HTH
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Good Morning Sarah,
Thank you again and I am going to try what you have advised with great care. Have you got an picture of the motor? if so could you forward a copy to me?
Thanks again, MikeM
Thanks also to DWB
QUOTE (sarah) <{POST_SNAPBACK}>The R.751 "Class 37" was fitted with two types of motor bogie.

The earlier (1967 - 1973(?)) is the "standard" Tri-ang 3 Pole "Open Frame" Motor bogie. The Later version is the "clip in" "Ringfield Motor" Bogie.

HTH

The Tri-ang motor date up to 1977 (Running number D6830). Ringfield motor from 1978 onwards (Running number 37 130).

The last Tring motor in 1977 and replace with new Ringfield from 1978 such as Hymek.
03.02.2008
Thank you everybody for your help and I now know exactly what I have got.
All I need to do now is find an exploded diagram of the motor (Tri-ang 3 Pole) so I can get it running before I try to convert it or not! If any of you know where I would appreciate the gen.
MIKEM56
QUOTE The Tri-ang motor date up to 1977 (Running number D6830). Ringfield motor from 1978 onwards (Running number 37 130).

The last Triang Hornby R751 Class 37 model to use the old Tri-ang 3 pole motor was 37 130 in 1977. It was then re-released in 1978 fitted with the Ringfield motor and Class 47 bogies.

DCC'ing the old R751 isn't an easy job, but not impossible.
Which version of R751 do you have, the earlier version without the extra pick ups added to the rear bogie?
or the 1972 version with the extra pick ups added to the rear bogie?
If it's the 1972 version with the extra pick ups added to the rear bogie
Remove both phosphor bronze pick ups from the power bogie ad disgard.
Insulate both legs of the power clip that hold the brushes in place against the commutator.
take the two wires from the rear bogie and solder one to the red wire and the black wire to the other.
Then solder the orange and grey wires from the decoder to each brush and test for short circuits using a multi meter.
If everything's ok, place on the track and away you go.
If the motor is running slowly, set CV5 to 255 and CV2 to 50, and you should then see a improvment in the running of the motor.

MikeM56 PM me your email address and I'll email you back a copy of the Hornby service sheet for R751

K9-70
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Hi K9-70,
Thanks for the reply. The motor has got the extra pickups on the rear. My email is [email protected]
All the best Mike
MikeM56,
Email plus two images sent, forgot to add subject to email.

K9-70
Hi if you are looking for Hornby servicesheets for most models you can obtain a CD from gm modelrailways
or it can be obtain from E- Bay for about £4.5
regards Noel
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2
Hi all.

I'm glad the information has come out. I have temporarily mislaid my copy of the service sheets CD (as in Post above.)
I can also recommend the CD.
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