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Telma Retarder Rebuild

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(@gse_uk)
Posts: 15
Member
Topic starter
 
I have 2 Telma retarders from the Volvo B10 bus to rebuild for my hub dyno project. But unfortunately the first one I have stripped has broken external coil wires. Has anyone successfully been able to remove the coils without destroying them in the process? They seem pretty well stuck in place. I am hoping to be able to carry out a repair on the removed coil
 
Posted : 25/11/2020 8:19 pm
(@gse_uk)
Posts: 15
Member
Topic starter
 

I would attach a couple of photo's but I can't see the "choose file" to attach them. I have removed the pole shoes

 
Posted : 25/11/2020 8:33 pm
(@gse_uk)
Posts: 15
Member
Topic starter
 

Found the "Attach file"

 
Posted : 25/11/2020 9:05 pm
(@gse_uk)
Posts: 15
Member
Topic starter
 

2nd photo

 
Posted : 25/11/2020 9:07 pm
(@slider)
Posts: 16
Member
 

Yup, the coils are pretty stuck in old eddy brakes, i had to destroy them all to get removed 😄

 
Posted : 26/11/2020 8:55 pm
(@gse_uk)
Posts: 15
Member
Topic starter
 

What did you do for replacement coils?

 
Posted : 26/11/2020 10:29 pm
(@slider)
Posts: 16
Member
 

The insulation resistance of the coils were too low, so i had to replace them. I made new coils myself from a new aluminum coil wire.

I hope you have measured your all coils with insulation resistance meter...

 
Posted : 26/11/2020 10:40 pm
(@gse_uk)
Posts: 15
Member
Topic starter
 

Not got that far yet, think I will have to rewind all of them too, do you have more info on how you rewound your coils such as the spec of wire used and insulation materials etc.

 
Posted : 26/11/2020 11:17 pm
(@slider)
Posts: 16
Member
 

I used same diameter coil wire as the original coil wire was. I wind the wire about 240 loops (if i remember correct) to get same resistance as the original coils. I used 2mm rubber mat to insulate the inside and the ends of the coil, outside i just wrapped with electrical tape 😄 This might not been the right way to do it, but it has worked several years now 🙂

 
Posted : 27/11/2020 8:19 am
(@gse_uk)
Posts: 15
Member
Topic starter
 

Thanks for the info

 
Posted : 27/11/2020 7:11 pm
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