Transmission and Primary Oil Change
Thread Starter
|
Cruiser
Joined: May 2006
Posts: 210
Likes: 0
From: Shelbyville, KY
Transmission and Primary Oil Change
Before everybody tells me to get a service manual, i already have one. I have \\; been unable to find how to change the transmission and primary fluid in my Heritage. I know how to change the transmission but my question is does the bike need to be cold? Also what kind of fluid do you run in your transmission. I was told to run gear oil. I'm not sure on how to change the primary fluid. Any help would be great. Thanks in advance
 \\;
 \\;
Ultimate HDF Member
Joined: Feb 2008
Posts: 5,615
Likes: 9
From: Escondido, CA
RE: Transmission and Primary Oil Change
See that big round cover with about five bolts in it on the left side of the primary? Drain bolt should be under that. Take it off to fill it back up again. Check your manual to see whether the bike needs to be on the stand or straight up. For the primary use a quality motor oil, 30w or such. Nothing fancy is needed there. For the tranny I use Mobil 1 synthetic gear oil, 75w/90 or 75w/140. Just my personal choice, others use amsoil, redline, purple stuff, pick one but synthetic makes the shifting much smoother.
Outstanding HDF Member
Joined: Jun 2006
Posts: 3,432
Likes: 0
From: SW Ohio
It is between the shocks.... You almost have to do it by feel. Hard to see. I belive it takes a 5/8 soocket,and a long extension. Caution. It is very easy to strip the threads putting it back in !!!!!!!!!!!!!!!!!! Don't ask me how I know .
Trending Topics
Seasoned HDF Member
Joined: May 2008
Posts: 21,144
Likes: 12,708
From: South Carolina
It is not between the shocks, it is a small plug on the right side of the transmission, just below the cover that the clutch cable go into.
It is a torx, be careful when you re install the plug, it is a tapered pipe plug, and overtightening can cause damage.
It is a torx, be careful when you re install the plug, it is a tapered pipe plug, and overtightening can cause damage.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Road Warrior
Joined: Dec 2011
Posts: 1,805
Likes: 47
From: Lake Tahoe California
Guys, not everyone has a twin cam.
The OP has an EVO engine, the tranny drain is NOT where our twin cam's tranny drain is. Dan89 is correct....