38XX (R2918) rough running problem.

Discuss Hornby Model Railway products and related topics here. This includes (Lima, Rivarossi, Jouef, Electrotren).
Dad-1
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Location: Dorset - A mile from West Bay.

38XX (R2918) rough running problem.

Postby Dad-1 » Tue Jul 11, 2017 12:20 pm

I've had it quite a long time and can't really remember using it since we moved
south in December 2013. In testing for those that run on 1st radius track she was
dusted off and run.
MMM funny noise and stopped. After that each time power was applied I had a noise,
but no motion, either forward, or reverse.
Took apart, nothing obvious. Wheels and motion turned easily enough when the motor
was disengaged, but before that when still in place power to wheels not causing any
response, or movement. Found a loose/broken wire, but that may have been during
taking apart.

When the motor was checked on a DC feed into stubs of wire from the brushes it ran,
but lumpy like a 4 cylinder engine with one bad plug lead. I have seen this before with a
couple of Bachmann motors.

I reassembled and it works, but has a rubbing sound and jerks at the slower speeds that I use.
As the sound is not at a constant place in the wheel rotations it can only be the motor, or
the drive gears. Is it going to have to be a £16 motor from Peters Spares ?
Certainly the chassis with wheels and gears in place was loose and smooth. Anyone else
had motor problems like this ?

Geoff T.
Remember ... I know nothing about railways.
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Bufferstop
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Re: 38XX (R2918) rough running problem.

Postby Bufferstop » Tue Jul 11, 2017 4:17 pm

Is it a can motor, or can you see whats going on? One of the end bearings shifting in the housing?
Growing old, can't avoid it. Growing up, forget it!
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Dad-1
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Joined: Sun Aug 24, 2008 8:05 pm
Location: Dorset - A mile from West Bay.

Re: 38XX (R2918) rough running problem.

Postby Dad-1 » Tue Jul 11, 2017 5:18 pm

Found it !!
NEVER assume anything.
I wondered where a small screw came from on the workbench.
I have a few in the box with my now magnetized miniature screwdrivers and assumed
it had come from there.
I again stripped back to a chassis and tender 'cos the decoder is in the tender.
There was a definite noise at the hesitation point, but I couldn't really see well enough.
I loosened the motor locating screw and drove slowly.
I could see the motor lift at the tight spot.
Under my best magnifiers I could just see one damaged tooth.
That screw must have gotten into the gears from the open under boiler space at some time, odd as it's usually packed away correctly.
Then it had jammed between the worm and plastic cog - something had to give ?
Fell out when loosened ......
New gears already ordered from Peters Spares.

I'm going to look and see if I can add some protection to prevent it ever happening again.
Under load the motor is just about usable, not worth the £16 to change it.

Geoff T.
Remember ... I know nothing about railways.
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Peterm
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Re: 38XX (R2918) rough running problem.

Postby Peterm » Wed Jul 12, 2017 1:02 am

It's time that people like us went to gauge 1, we might be able to find things like that first time round then.
Pete.

Dad-1
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Joined: Sun Aug 24, 2008 8:05 pm
Location: Dorset - A mile from West Bay.

Re: 38XX (R2918) rough running problem.

Postby Dad-1 » Thu Jul 13, 2017 7:43 pm

Peter, I have looked a '0', but too late to change !!
Thank heavens I kept away from 'N'.

Peters Spares are expensive for P&P when just one very small packet
held everything, the P&P cost more than the pack of parts !!
Having said that it was a very nice box clearly addressed and arrived
post haste, first class mail. The old story you get what you pay for ?

It was interesting that Peters Spares only had 3 drive gear sets left, Oh
down to 2 now. I wonder if this is indicative of the open access into the
gear box from the nice open gap under the boiler. You can't really look
into it, but small screws or other debris can find it's way in.

I now have to have a big strip-down to change the damaged part.

Quickly noticed a 38XX for sale in the local toy shop for £89 .... Double
checked today, but it's 38003 that I have .... Now if only it had been
early BR .......

Geoff T.
Remember ... I know nothing about railways.
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Bufferstop
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Re: 38XX (R2918) rough running problem.

Postby Bufferstop » Thu Jul 13, 2017 8:56 pm

I reckon that screw got in there when you packed it away. The Bachmann white grease would have glued it in place firmly enough not to fall out when you unpacked it. I agree some protection for those gears would be a good idea.

Mod Edit : Predictive key board giving 'years' in place of the required 'gears' ?
Or was it the 'pinkies' as one old buddy used to say regarding typographical errors.
GT.
Growing old, can't avoid it. Growing up, forget it!
My Layout, My Workbench Blog and My Opinions

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Peterm
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Re: 38XX (R2918) rough running problem.

Postby Peterm » Fri Jul 14, 2017 12:31 am

Old banana fingers John. :)
Pete.

GWR_fan
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Re: 38XX (R2918) rough running problem.

Postby GWR_fan » Fri Jul 14, 2017 12:51 am

Peterm wrote:Old banana fingers John. :)


Not just John. With my porkies I am regularly hitting all the surrounding keys rather than the one intended. I have to proof read everything prior posting as I type looking at the keyboard and not the screen.

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Bufferstop
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Re: 38XX (R2918) rough running problem.

Postby Bufferstop » Fri Jul 14, 2017 10:09 am

It's not just predictive, Google's AI driven keyboard continues to review the words after you have moved on. Some of it's substitutions seem rather dubious to me, substituting words that sound alike but have different spellings and meanings. Changes seem to be liable to happen right up to the point the editor closes the file, that's after it has gone from the screen. I know that their voice command system passes the task onto a bunch of zombies paid to work out what you said when the computers can't cope, does the same thing happen with your text? It's definitely Google keyboard, as it doesn't happen when I'm using the PC.
Growing old, can't avoid it. Growing up, forget it!
My Layout, My Workbench Blog and My Opinions

Dad-1
Posts: 5082
Joined: Sun Aug 24, 2008 8:05 pm
Location: Dorset - A mile from West Bay.

Re: 38XX (R2918) rough running problem.

Postby Dad-1 » Fri Jul 14, 2017 7:16 pm

GWR_fan, You're not the only one who feels he HAS to proof read because of either
the errant finger, or just spelling incorrectly, AND I still miss things !!

Back to the 38XX, all running well and if you're bored and want to see a small video of
it working around some 1st radius curves look in the FAQ section.

Geoff T.
Remember ... I know nothing about railways.
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