Harley Davidson Forums banner
21 - 40 of 51 Posts
Geez that must have suked. I want to buy a M8 but ????????????. My son picked up 2017 SG just lately with 2500 miles. Told him about it, hope he listens.
In the M8's defense, not all that many have problems, but mine sure as hell did! The MoCo was trying to say it was the way I ride, but after the 1st 10,000 miles on my 14 Rushmore, not one drop of tranny fluid left the gearbox, soooooooooooooo..........yeah, that ain't it. And my 03 RK never loses any either.

Thread theft over......
 
Nope

But is there something in the photo I'm not seeing that shows the problem?
I didn't see anything! but with my eyes ain't what they used to be, looks like just another Primary to me
 

Attachments

  • Like
Reactions: SoftailBilly
I checked my 2018 Ultra Classic at 20,000 miles and there was no indication of a leak over or transfer of oils but did speak with 2 members of my HOG chapter with 2017 and 2018's and they said they were having that problem as it was draining their transmission fluid and had a factory rep drill a hole in the 2 cases to relieve pressure and did not have a problem after that.
 
My 2019 Electro Glide standard had the same problem which was discovered when I took it in for the 1,000 mile service. Apparently not uncommon and Harley has a fix. Mine would have been covered under warranty. The fix involves venting the crankcase. that's the way it was to me and also included other parts. I got a good trade at the dealership so I left it there not wanting a ride with the modification and worrying about checking the tranny every time you turned around. Hoping the new bike (same engine) escaped this flaw or i'm in a real deep hole.
 
not wanting a ride with the modification and worrying about checking the tranny every time you turned around.
If the mod cures the problem, why would you worry?
 
My 2019 Electro Glide standard had the same problem which was discovered when I took it in for the 1,000 mile service. Apparently not uncommon and Harley has a fix. Mine would have been covered under warranty. The fix involves venting the crankcase. that's the way it was to me and also included other parts. I got a good trade at the dealership so I left it there not wanting a ride with the modification and worrying about checking the tranny every time you turned around. Hoping the new bike (same engine) escaped this flaw or i'm in a real deep hole.
I must be confused or just not thinking about this correctly. How does venting the crankcase stop tranny fluid from migrating into the primary?
 
I must be confused or just not thinking about this correctly. How does venting the crankcase stop tranny fluid from migrating into the primary?
May have meant the tranny or primary. Sometimes service writers/sales repeat incorrect facts with propaganda. The trans is vented on the M8's is it not? This whole problem might be entirely a design issue expensive for HD to fix IMHO.
 
The trans top cover has the vent hose. Maybe the OP should verify the hose isn't plugged up. I would remove the hose to check, do not blow compressed air into the vent or the seals will pop out.
 
  • Like
Reactions: SoftailBilly
I believe the OP is talking about this......

https://serviceinfo.harley-davidson.com/sip/service/document/1240689332062248053

This is MoCo's fix, (read: Band-Aid), to stopping the transfer of tranny fluid thru the clutch pushrod from the tranny into the primary caused by a lower pressure, "vacuum", in the primary pulling the fluid into it. In March of 2017, I volunteered to vent my primary as a test to see if that was causing my transfer on my brand new 2017 RK in an effort to help the MoCo troubleshoot this issue. The West Coast HD Guru said , "No, we already tried that and it didn't work". But yet, a few months ago this is now the "Fix" per MoCo. Again......... a Band-Aid. I let them attempt 5 different "Fixes" on my 1st bike, and 2 more on the 2nd one that they replaced my 1st one with, until I gave up and went backwards onto my Rushmore SGS. Something is different in these new tranny/primary combos on the new M8's causing this phenomenon and venting the primary is only covering that issue up. We never needed a vent on the primary before. What else is wrong in there? Who knows........for now. Other issues may show up later, or maybe not. I'll stick with my TC and ride with noooooo worries thank you very much.
 
Put some gauges on trans and primary. Is there positive pressure or vacuum ???
 
Some history on oil transfer thru the years with Harley's
 
  • Like
Reactions: DRVMN
Oh well there was message before I hit button of a prior post do you want to read it. I didn't.
 
21 - 40 of 51 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top