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SR040 turntable motor


50 posts

I have a rather elderly R040 turntable (looks generally similar to R070), and I have two questions regarding the motor used to motorize it.

1.  What is the part number for this motor, as it isn't working well (won't always start, etc), and where can I get a replacement?

2.  How can I reduce the noise that this motor/turntable makes when in operation?  The motor itself is fairly quiet in open air, but the transmitted noise echoes throughout the motor enclosure and to the mounting surface, and it's LOUD.

This turntable seems to work well, the gearing is OK, it registers properly at the exit tracks, etc.  So I would like to include it in my current layout, if I can resolve the motor issues.

Any help would be appreciated.  Thanks.



10995 posts

Community Moderator

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None in stock above at present but its a normal M7 motor so you could swap it out if you can’t find the full motor assy with wire harness, etc.

Peters Spares may have them.


Halton Brat - Running Win 10, 64-bit - RM (Pro-Pack) with Elite as Controller-A, Select as Walkabout and E-Link as Controller-B - Locos are mostly TTS. http://www.halton96th.org.uk/page21.html


2150 posts

Hi Paul,


May I ask how you control the turntable ? Do you have it connected to a 12v DC supply with an on/off switch, or do you use a controller where you can run it at a lower speed ?


If the former, it will sound like a dog with its leg caught in barbed wire !!



DCC Elite + Railmaster+ProPack, Windows 10 desktop


403 posts

are you sure it's an M7 motor not an X04 type? as the early turntables had an X04 .

could you post a picture of the motor ?

I do know what I’m doing most of the time


1375 posts

The original versions of this turntable (R.410 type) used an X.04 / X.03 (New Type) Type motor, but fitted with a Special Brass worm.


This is a single-start worm, of the type later used on the X.03 (New Type) locomotive motors.


So, a Locomoive X.04 motor would not work, as the worm would jam in the gears...


There are som photos of a later X.03 pattern motor fitted to an eraly R.410 Turntable in this thread...




More recently, the Hornby turntables have been re-motored with the "M" type motor....

I think the motor mountings may have been re-tooled?

Regards Sarah.


8680 posts

Community Moderator

Poor dog.

Perhaps 'stirring a bucket of bolts' would have been a less cruel description.

Chris........ Making the wood in the trees visible.


50 posts

Thanks for all the replies.


OK, so here is a photo of the motor I have - needless to say it is totally devoid of any identification.


I'm not sure from Sarahagain's post whether this is an X03 or an X04 - it has a single-start brass worm.  I think it is an X04, but would like confirmation before I buy.  And if I go to Peter's Spares and order an X04, how do I know which worm I will be getting?


In terms of noise, I concur with the graphic description as 'stirring a bucket of balls'.  I haven't actually installed this turntable yet, just doing some bench tests.  Running at a lower voltage reduces the noise to 'a half bucket of balls', but it's still pretty terrible.  

I was wondering whether anyone had attempted to muffle the noise - e.g. inserting sound deadening material on the inside of the motor/gear housing, or mounting the TT on some kind of insulating mat, or . . . . . . ?  Because the motor itself is quite quiet.

I was planning to use a 2-pole centre-off switch with a supply of suitable voltage, once I have got the motor in and tested to see what it needs.




1375 posts

The X.04 motors have felt pads around the bearings on the motor shaft.


The X.03 (Later Type) motors do not have the felt oil pads....and a shorter shaft.

Apart from the amature shaft length...that is the only differerence...

Very late X.04 locomotive motors were in fact the X.03 (Later Type) motor specification, but fitted with the Brass two-start worm...


If you ordered an X.04 motor, you would get a Locomotive X.04 motor, with a brass two-start worm.

If you ordered an X.03 motor, you would get a Locomotive X.03 motor, with a plastic single-start worm.

It seems that Peter's Spares also sell motors without worms....


The special worms are also available....just need a worm puller to remove existing worm....and a method of fitting new worm without damaging the motor....



It may be worth asking if Peter's Spares could supply a motor fitted with the Turntable worm?


It seems that that the turntable gear is the same as used in an X.03 powered loco, and that therefore the X.03 worm should work...if it has the length to reach the gear?


There was a kit, Turntable Motorising Unit, R.411, which was used to motorise the R.410 Hand-Operated Turntable...


 X.03 (Later Type) based Turntable Motor from the R.411 Kit, and other parts...


The problem with sound-proofing is that you could then cut the ventilation to the motor...which could then get a bit warm...


Really, apart from running the motor slowly, there is not much that can be done....


I am thinking of putting a building over the motor housing....possibly a 'sand house' with a chimney for ventilation...or a Water Tower with vents?

With some other parts, the turntable can be made to look pretty good...


BUT it will alway have the jerky "Geneva Gear" drive...and be a bit noisy in use!



A simpler idea, using girder bridge sides...(Temporary job...with Blue-Tac!)

Regards Sarah.


50 posts

Thanks, Sarah.


Bad news on worms.  There doesn't seem to be any way I can extract my existing worm without a special tool, which of course I don't have - and I have tried just pulling.  And the plastic worm on the X03 looks too short from Peter's illustration.


I will do as you suggest and ask Peter's Spares if they can supply me with an X03/X04 fitted with a turntable worm - they seem to have both motors and worms in stock.

Failing that, how feasible do you think it would be for me to fit the worm myself, using a mechanic's vice?  It looks like it is theoretically possible, but do you think there is too much risk of motor damage - bent shaft, etc.? I would still have to buy a new worm from Peter at the same time as a wormless motor, because my existing worm can't be freed from my current motor.  Definitely Plan B.


I will see how much noise a new motor makes at reduced voltage once I get one, and assess whether I can live with it.  Otherwise I will play with bits of flannelette in carefully selected spots inside (wouldn't want it to get into the gears or motor!).  Given the very low duty cycle of the motor, I wouldn't have thought heat build-up would be too much of an issue (but we'll see).




9798 posts

Seems to me your opening post shows you don’t need a new motor as you say it is operating and operating quietly when run on its own. These motors have a reputation for bullet-proofedness and the most they should need is light lubrication (including the bearing hidden behind the magnet - make sure you slide the magnet back only a little as it will lose magnetism if taken all the way out), check of the brushes and replacement if necessary, and cleaning out the slots in the armature if clogged with dust from the brushes. That will also solve your gear pulling problem.  Then follow the advice given on noise reduction including light lubrication of the gear train. 

and thanks for all the fish

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