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Diesel shunter 3132 (Henschel DHG 700)... in reverse.
 Joined: 09/02/2025(UTC) Posts: 17 Location: Liege
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Hello
I own a Loco Diesel shunter 3132 (Henschel DHG 700) (used), pure analog model.
If I have no problem in forward motion, on the other hand, in reverse, it is slow (< 1/2 forward speed) and reaches a plateau very quickly in speed.
My other classic locos don't have this problem.
New motor brushes, greasing and tires.
Any ideas?
Thanks
Phil
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 Joined: 02/02/2017(UTC) Posts: 694 Location: England, South Coast
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I have 3142, it is the same loco but in brown for FS.
It is not very satisfactory (for me anyway), makes a lot of noise and sounds rough even though I have changed brushes, adjusted brush tension, cleaned commutator, cleaned and lubricated gears etc etc.
Part of the problem seems to be resonance from the body, it is much quieter without (obviously).
So Phil, I cannot help but I sympathise!
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 Joined: 01/05/2016(UTC) Posts: 623 Location: Athens
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Originally Posted by: philippe99  Hello
I own a Loco Diesel shunter 3132 (Henschel DHG 700) (used), pure analog model.
If I have no problem in forward motion, on the other hand, in reverse, it is slow (< 1/2 forward speed) and reaches a plateau very quickly in speed.
My other classic locos don't have this problem.
New motor brushes, greasing and tires.
Any ideas?
Thanks
Phil Hi Check the field magnet
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Joined: 09/02/2025(UTC) Posts: 17 Location: Liege
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Originally Posted by: ktsolias [
Hi
Check the field magnet
Ok. But check what ? Stator/rotor misalignement ? Dirt in the rotor/stator gap ? Sorry but I never worked on such parts. Thx Phil
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Joined: 09/02/2025(UTC) Posts: 17 Location: Liege
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Originally Posted by: Michael4 resonance from the body, it is much quieter without (obviously). Agree. During my test procedure, I remove the body (and the side parts) and it was quieter. And , yes, this machine is slowly becoming a nightmare to my eyes. For instance, this is the only loco I have for which I have to remove the body to ensure a proper install of the adhesive tire. Phil
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 Joined: 28/01/2024(UTC) Posts: 60 Location: Nordrhein-Westfalen, Aachen
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Puzzling conundrum. Small differences in forward / reverse speed are normal, but a factor of two?
Can you hear a difference when motor is spinning in either direction with same controller position, without any load, no track contact?
Thoughts:
- damaged reverse stator coil. Check / compare resistance of the two coil parts.
- bad contact on reverser relay
- misaligned armature and commutator - rather improbable. Can you exchange with another loco? |
Regards,
Rüdiger (Rudi)
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Joined: 02/02/2017(UTC) Posts: 694 Location: England, South Coast
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Phil,
I would try playing with the tension of the springs that hold the brushes. Don't bend them yet, just see if any increased or reduced pressure has any effect. If not leave them alone!
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Joined: 09/02/2025(UTC) Posts: 17 Location: Liege
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Originally Posted by: RudiC Can you hear a difference when motor is spinning in either direction with same controller position, without any load, no track contact?
The sound is indeed more shrill in reverse than in forward gear. But I will now inspect the electric wrokflow, especially the @michael4 advises below Thx Phil
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Joined: 25/08/2012(UTC) Posts: 254 Location: South East
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I would go with Rudi on this and suggest that the alignment of the commutator (collector) and armature poles is not quite right. If this is not exactly right the timing will be advanced in one direction and retarded in the other.
I would suggest running it with a multimeter in circuit to measure the current draw and see if it is drawing more current in reverse.
Another test is to run it forward for ten minutes and see how warm the motor gets. Then let it cool and do the same in reverse and see if it is getting hotter.
It may be that you just have to live with it since I wouldn't recommend trying to move the commutator - the wires are very fine and it is very easy to mess it up completely (I know this.... no need to ask how.... :-)
I have a couple of locos that differ in running forwards and backwards - my 3047 BR 44 runs quite slowly backwards - I guess there may have been slight tollerances when the armatures were made.
As regards the noise - I have found a few locos that are noisy when running with the bodies on (e.g. 3000) can be improved a bit by keeping the body securing screw slightly loose. |
Marklin HO using M track. Now reverted to analogue as I find it has more character and is more fun...... and I understand it! |
 1 user liked this useful post by Paul59
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