JD generators

[Steve Swan]

i'm a bit reluctant to get involved in this conversation, but i will say the 22-26, 22-27 and 22-28 books do have that paragraph which does not clarify what models D and D1 are fitted to, in the case of any version of these books only states "...D and D1 are fitted to 1926 models." Depending if you're looking at '27 or '28 books then states "...D and D1 are fitted to 1927 (or 1928) models." (i don't have a 25-29 book, just 27-31). In the case of each of these books, if one scans down past "the paragraph" the parts number listing and description, the 22-26 book for example, page 23 explicitly lists verbatim pn "1502-26 (model D1)...... Singles..............42.00"

the line above pn 1502-26 lists pn 1501-26 for ""1926 twins"

Tommo, good luck with your foot surgery! Nice to see you back and hope you get the forum dropping your information while you're typing it. (lucky me hasn't had that problem).

[aumick10]

Cheers Tommo, hope the foot gets better.

I have a survivor 26 that has a badged "D" on it with a fixed third brush.
One of my 29's has a "D" generator with no tag and an adjustable third brush.
The other 29 has a tagged "D" without the adjustable third brush, not correct for 29.

The parts books show the adjustable third brush holder as for 1929 only. No mention of models so I assume all 1929 generators had the adjustable third brush, twins and singles.
If we use Perry's document as true, he says that the tag was discontinued in 28.

I cannot explain how you have so many "D1"'s over there with adjustable third brushes.
If they have tags, and take a twin lobe timer gear, they should be 26-27 tagged, but without adjustable third brush, or untagged 29 only with the adjustable third brush.
Maybe an export issue, or somebody was drunk at work when they were assembled.
Maybe the singles weren't selling well, and they had surplus, so they changed the timer drive gear to a twin gear (4 teeth) to use them up.

The ongoing game of trying to confirm 100 year old information.

Cheers,
Mick

[aumick10]

Apologies to all. When i cleaned up what I thought was a B1, it turned out to be a BF generator. It looks to me like the F has been added later maybe.
Both generatos also had the same distributor drive gear, so probably not for a single.

[ATTACH=CONFIG]27524[/ATTACH][ATTACH=CONFIG]27525[/ATTACH]

Bump.
back to an earlier question, has anybody come across a "BF" tagged generator?
Cheers

[Steve Swan]

unless i'm misinterpreting what you wrote about 3rd brush holders i will say 3rd brush holder's pn's are listed in 22-26, 22-27 and 22-28 parts books. 3rd brush holders were fitted to all generators as far as i can tell, 1920-onwards. i can't think of any logical reason why a single cylinder model generator would not have a 3rd brush.

(not to change the subject adding to confusion, 3 brush generators used a relay (cutout) to try to control generator output. Wouldn't 2 brush require a regulator? Were regulators fitted to ANY H-D model before 1930...? i would think not, since parts book only lists "relay" (aka cutout) but i don't have any evidence to say regulators were or were not used before 1930).

The 27-31 parts book lists two different pn's: 1) 1662-26 for 1926-1928 -and- 1662-29 for 1929. Of the 26-29 J model series, 1929 is unique in that the 1929 year introduced the adjustable 3rd brush, hence the two different pn

[aumick10]

Steve,
My bad, I mean adjustable third brush when referring to a 29 generator.
I will edit my post.

[Steve Swan]

Steve,
My bad, I mean adjustable third brush when referring to a 29 generator.
I will edit my post.

u bad boy u.

[aumick10]

Head runs faster than the fingers

[Steve Swan]

Head runs faster than the fingers

wear mittens then! (: (: (:

[RichO]

d generators

Tommo, I believe that other hole in the base of the d's was for mounting them on the sport model instead of the single. I have one with grease in it too. I hope this doesn't cloud the issue but we forgot the sport model.

[MMasa]

Sorry I missed out on this thread. I’ve been away with limited internet access.
With regard to the number of tagged earlier D generators with the externally adjustable third brush.....
Perhaps it was a period retrofit done by owners since it’s a butt ton easier than;
stopping the bike, taking the end cover off, loosening screws, making the adjustment (hopefully correctly), tightening the screws, reattaching the cover, and finally restarting the bike to see if you moved the brush holder the right amount.
It’s just a few parts involved to add the feature to a 26-28 model D.
Just a WAG but I probably would have done it back then for the relatively small cost.
Mark Masa