26727 Motor problem

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klarinettmeister		#1 Posted : 05 June 2010 16:29:44(UTC) Retweet
Joined: 13/02/2008(UTC) Posts: 812		Hi! I have a lots of Märklin engines and I´ve only had problem with one loco. Namely the swedish RC loco from 26727. I´ve been having it for alot of years and have been experiencing problems since I bought it. The problems were not so bad in the beginning but it´s been worse, much worse. When the first problems appeared (jerky driving, stopped suddenly) I checked the motor. It was full with oil and I cleaned it. The problems disappeared for a while and I put in the box. Later I wanted to drive it and the same things happened. The motor is really cleaned and now there´s another situation. There´s smoke comming from the motor. Still it´s very clean and I´ve put oil on all the recommended places. When I´m turning the speed knob the motor will accelerate for a few seconds and stops and smoke comes from the motor. After a few seconds it will accelerate again and stop and smoke comes from it again. The tab on the holder for the decoder shows signs of some heat. What could cause the problems? The motor? The decoder? Or everything together? And what should I do? Picture on the motor /David
		37624 F7, my first review My layout in construction. /David


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TimR		#2 Posted : 05 June 2010 16:58:16(UTC) Retweet
Joined: 16/08/2007(UTC) Posts: 1,752 Location: Jakarta		I would think it's the motor and not the decoder.. Have you completely disassemble all the motor parts again? It's a pain, but I always found complete disassembly and putting them back on always solve most of the problems. Also, check all the cables and the brush contact (hope it's free of oil)...
		Now collecting C-Sine models.


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klarinettmeister		#3 Posted : 05 June 2010 17:08:32(UTC) Retweet
Joined: 13/02/2008(UTC) Posts: 812		TimR wrote: I would think it's the motor and not the decoder.. Have you completely disassemble all the motor parts again? It's a pain, but I always found complete disassembly and putting them back on always solve most of the problems. Also, check all the cables and the brush contact (hope it's free of oil)... I have disassembled the motor a lot of times and cleaned it. I´ve also cleaned the brushes and their holders. The brushes are oily and I´ve cleaned them several times and also the holders.
		37624 F7, my first review My layout in construction. /David


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klarinettmeister		#4 Posted : 05 June 2010 17:56:01(UTC) Retweet
Joined: 13/02/2008(UTC) Posts: 812		Problem is solved! (part of it) As I have 11 other RC-locomotives I took my 33411 which I´ve installed a 60760 into and experimented. It resulted into locating which part was faulty. I guess a copper wire has broken. Now the other part is: which loco is going to be broken till I order the spareparts? Thanks for the help Tim!
		37624 F7, my first review My layout in construction. /David


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H0		#5 Posted : 06 June 2010 11:18:43(UTC) Retweet
Joined: 16/02/2004(UTC) Posts: 15,495 Location: DE-NW		Hi, Tim, Did you clean the collector? Carbon dust in the gaps between the collector fields can lead to decoder overload and finally decoder switching off. That's the main reason why oil should never reach the brushes or the collector. Dry carbon dust is more likely to fly off. I once had an analogue loco with a 3-pole rotor where a wire was off - it was still running (with constant speed) and smoke came out when running on high voltages. One wire was off the soldering point and I was able to fix it. There's a generation of "soft" carbon brushes from Märklin. Replacing the brushes could help to prevent future trouble (if the collector is the problem).
		Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS


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gachar001		#6 Posted : 07 June 2010 21:51:12(UTC) Retweet
Joined: 29/04/2008(UTC) Posts: 1,391 Location: Chennai		As Tom mentioned, it could be carbon on the commutator. I had the same symptoms on one of my locos. It turned out to be the carbon. I cleaned the rotor in Ronson lighter fluid and then used a small, sharp screw driver to get the carbon deposits out of the narrow gaps in the commutator. I had to do this around 3 - 4 times untill the loco finally started running fine.
		Gautham Atlanta, GA USA


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klarinettmeister		#7 Posted : 08 June 2010 14:59:10(UTC) Retweet
Joined: 13/02/2008(UTC) Posts: 812		gachar001 wrote: As Tom mentioned, it could be carbon on the commutator. I had the same symptoms on one of my locos. It turned out to be the carbon. I cleaned the rotor in Ronson lighter fluid and then used a small, sharp screw driver to get the carbon deposits out of the narrow gaps in the commutator. I had to do this around 3 - 4 times untill the loco finally started running fine. It´s possible that´s the problem. I remember the first time I opened the motor. It was really oily and dirty. I will try cleaning the rotor.
		37624 F7, my first review My layout in construction. /David


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RayF		#8 Posted : 08 June 2010 15:08:47(UTC) Retweet
Joined: 14/03/2005(UTC) Posts: 15,874 Location: Gibraltar, Europe		I agree with Tom and Gautham. I've also had this problem. I used a toothpick to clean the carbon deposits out of the gaps in the commutator.
		Ray Mostly Marklin.Selection of different eras and European railways Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.


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