Used BR89 running hot.........

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spinnerguy		#1 Posted : 22 January 2024 13:30:30(UTC) Retweet
Joined: 26/11/2023(UTC) Posts: 25 Location: England, Stafford		Just acquired this used .it runs ok,and I have given it a light oiling. The casing is becoming hot after 4-5 minutes running,with voltage half way on controller.I suppose this means motor brushes are on the way out ?

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marklinist5999		#2 Posted : 22 January 2024 13:38:06(UTC) Retweet
Joined: 10/02/2021(UTC) Posts: 3,158 Location: Michigan, Troy		Remove the body and run it to see if the heat is from the motor or the field coil if it is an older analog version. You can check the brushes for wear and replace them. Check the capacitors and condenser for heat and melting.


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kiwiAlan		#3 Posted : 22 January 2024 14:33:33(UTC) Retweet
Joined: 23/07/2014(UTC) Posts: 8,111 Location: ENGLAND, Didcot		Originally Posted by: marklinist5999 Remove the body and run it to see if the heat is from the motor or the field coil if it is an older analog version. You can check the brushes for wear and replace them. Check the capacitors and condenser for heat and melting. As the posting is in the "small scale" section I suspect it doesn't have a field coil, being a Z gauge item ...

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spinnerguy		#4 Posted : 22 January 2024 17:47:24(UTC) Retweet
Joined: 26/11/2023(UTC) Posts: 25 Location: England, Stafford		Correct,it is Z scale.I have no means of checking the elecricals,apart from visual .Body has been lifted off ,top bearing oiled on motor which has reduced the heat . There is wear left on brushes.The casing is a tight fit over motor,with not much air to cool it .Will monitor ....

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Poor Skeleton		#5 Posted : 22 January 2024 20:58:03(UTC) Retweet
Joined: 09/10/2015(UTC) Posts: 553 Location: England, Cambridge		Originally Posted by: spinnerguy Just acquired this used .it runs ok,and I have given it a light oiling. The casing is becoming hot after 4-5 minutes running,with voltage half way on controller.I suppose this means motor brushes are on the way out ? I don't think worn brushes would make the motor run hot, in fact I very much doubt it's an electrical issue, you'll be pleased to hear. More likely is that the mechanism isn't running freely and this is placing excess load on the motor. There has been a discussion on one of the other threads recently about freeing gunked up mechanisms so check that out for suggestions that don't involve disassembling the entire loco. Good luck! Chris

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spinnerguy		#6 Posted : 22 January 2024 22:01:38(UTC) Retweet
Joined: 26/11/2023(UTC) Posts: 25 Location: England, Stafford		Now the oil has worked through,I think the top motor bearing being dry was causing the problem.I dont think the loco has been oiled in a long time,if at all. Now running cooler and smoother.......

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Zme		#7 Posted : 26 January 2024 03:04:51(UTC) Retweet
Joined: 02/10/2013(UTC) Posts: 768 Location: West Texas		Hello, hope all is well. A while back, there was a discussion here that the brushes on these small locomotives could be causing excessive pressure. I expect this would makes sense also. Here is a video from one of our members, z scale hobo. Manipulate of the brushes could be something to consider if your problems continue. Check it out, take good care. Dwight


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Wheelflat		#8 Posted : 26 January 2024 19:35:56(UTC) Retweet
Joined: 26/03/2023(UTC) Posts: 9 Location: England		You must clean the gaps between the commutator plates using a sharpened wooden toothpick. If these are clogged the motor will draw about 0.3 amps and get hot. Also make sure the commutator is free from grease and the the loco is otherwise in free running, well serviced condition as others have said. Once you have cleaned the gaps, expect to see it draw about 0.18 amps maximum. These motors always get a little bit warm, but they should not get really hot. Carefully bending the brushes to reduce the tension will reduce the current consumption a bit, and make for smoother starts. If there is not enough tension however you will get excessive sparking and poor running. Only play with the brush tension if absolutely necessary. Hope this helps

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husafreak		#9 Posted : 02 February 2024 17:20:25(UTC) Retweet
Joined: 09/04/2019(UTC) Posts: 559 Location: California, Bay Area		I have an older BR89 (five pole) which has always gotten hot. It was one of my first locos. Oiling it would produce wisps of smoke! But it always ran and as I acquired more loco's I used it less and less. Maybe I'll try the tips listed above. I have never specifically cleaned the "gaps" on a commutator or adjusted brush tension.

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marklinist5999		#10 Posted : 02 February 2024 18:14:53(UTC) Retweet
Joined: 10/02/2021(UTC) Posts: 3,158 Location: Michigan, Troy		A tighter area inside the body for the motor.


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