3074 digital conversion issue

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3074 digital conversion issue - which armature to use, 7 tooth or 8 tooth

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Donb		#1 Posted : 31 December 2018 19:18:02(UTC) Retweet
Joined: 03/04/2013(UTC) Posts: 289 Location: Fraser Valley		Hi, I have converted a 3074 216-090-1 with a 60760 kit and a new drive bogie E415670. I am using the 7 tooth armature that came in the 60760 kit, however the motor makes buzzing noise at various speeds so I suspect I have the wrong armature? According to the parts diagram, the E 415670 takes either a 231440 , 245480 or 386820 armature . I cannot find where it tells how many teeth these armatures have. Also what is the part number of the armature I have (part of the 60760 kit)? it is no where on the box or documentation, AFAIK. Confused... Cheers, Don
		Best Regards, Don ___________________________________________________________________________________ CS3, ( Commander is now retired) , C track and Z scale, mostly DB/DR and SBB, SJ


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jvuye		#2 Posted : 01 January 2019 17:07:20(UTC) Retweet
Joined: 01/03/2008(UTC) Posts: 2,881 Location: South Western France		Originally Posted by: Donb Hi, I have converted a 3074 216-090-1 with a 60760 kit and a new drive bogie E415670. I am using the 7 tooth armature that came in the 60760 kit, however the motor makes buzzing noise at various speeds so I suspect I have the wrong armature? According to the parts diagram, the E 415670 takes either a 231440 , 245480 or 386820 armature . I cannot find where it tells how many teeth these armatures have. Also what is the part number of the armature I have (part of the 60760 kit)? it is no where on the box or documentation, AFAIK. Confused... Cheers, Don Things should be OK with the components you have However, the permanent magnet from that kit can be tricky to align properly and provide the proper spacing with the rotor You need (exactly!) 2 mm diameter pegs to insert in the holes to align everything before installing the screws. Then remove one peg, install the screw and tighten. Repeat at athe other side. The trick is to keeo a peg in the other hole while you tighten the first screw. Then there is a possible interference between one pf the screw and the gears on the transmission side. Try replacing the screw by a shorter one You can test for proper friction-free installation by removing the brushes and turning the wheels by hand. Good luck Cheers Jacques
		Jacques Vuye aka Dr.Eisenbahn Once a vandal, learned to be better and had great success!

1 user liked this useful post by jvuye		Donb
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