Touring Models Road King, Road King Custom, Road King Classic, Road Glide, Street Glide, Electra Glide, Electra Glide Classic, and Electra Glide Ultra Classic bikes.
Sponsored by:
Sponsored by:

Checking tranny fluid

Thread Tools
 
Search this Thread
 
Old Aug 5, 2012 | 10:46 PM
  #1  
P51Driver's Avatar
P51Driver
Thread Starter
|
Road Warrior
10 Year Member
Liked
Loved
Community Favorite
Joined: Jul 2012
Posts: 1,307
Likes: 195
From: Ohio
Default Checking tranny fluid

OK I read the manual and it doesn't say whether one should check the tranny fluid when the engine is hot or cold for a 2012 SG 103.
So should the tranny fluid be checked when hot or cold, or doesn't it matter?
 
Reply
Old Aug 5, 2012 | 11:00 PM
  #2  
ChristoHD's Avatar
ChristoHD
Road Warrior
Joined: Jul 2010
Posts: 1,812
Likes: 26
From: South Bend, IN
Smile

Originally Posted by P51Driver
OK I read the manual and it doesn't say whether one should check the tranny fluid when the engine is hot or cold for a 2012 SG 103.
So should the tranny fluid be checked when hot or cold, or doesn't it matter?
Doesn't really matter.
 
Reply
Old Aug 5, 2012 | 11:13 PM
  #3  
jcb1975@yahoo.com's Avatar
jcb1975@yahoo.com
Tourer
Joined: May 2010
Posts: 450
Likes: 2
Default

Check when hot. When fluids heat up, they expand, AKA thermal expansion. Overfill and it will come out of the breather, or somewheres else. Underfill and lack of proper lubrication.
 
Reply
Old Aug 5, 2012 | 11:45 PM
  #4  
Fishrrman's Avatar
Fishrrman
Road Warrior
Joined: Aug 2011
Posts: 1,510
Likes: 23
From: Connecticut
Default

After owning several bikes over the past 21 years, I never bother to "check" the transmission oil between changes.

The only time you might need to do this is if you have evidence of a leak, and about the only place you really have to worry about a leak is on the primary side where the front belt pulley is. The pulley can work itself loose and the seal will give out, but if that happens, you've got more problems than low transmission oil.

I've been using Mobil1 75w/90 synthetic for years, and find that it pretty much comes out looking the same as when it went into the transmission.

The new 6-speed trannies are easy to fill, too -- just take a 1qt. bottle and pour the whole thing in, then put the filler plug back in...
 
Reply
Old Aug 6, 2012 | 12:03 AM
  #5  
09FLHT's Avatar
09FLHT
Banned
Joined: Dec 2011
Posts: 2,323
Likes: 1
From: Arizona
Default

Do you have a leak? If not its still in there.
 
Reply
Old Aug 7, 2012 | 06:16 PM
  #6  
P51Driver's Avatar
P51Driver
Thread Starter
|
Road Warrior
10 Year Member
Liked
Loved
Community Favorite
Joined: Jul 2012
Posts: 1,307
Likes: 195
From: Ohio
Default

Originally Posted by jcb1975@yahoo.com
Check when hot. When fluids heat up, they expand, AKA thermal expansion. Overfill and it will come out of the breather, or somewheres else. Underfill and lack of proper lubrication.
Formula + is a oil I don't think oils really expand like atf when hot.
So like christo said I don't think it really matters if the bike is hot or cold.
The only thing that matters is letting the bike sit for a bit if you are checking it hot to let all the tranny fluid settle (run) down from the top of the inside of the tranny case.
 
Reply
Old Aug 7, 2012 | 06:52 PM
  #7  
Notgrownup's Avatar
Notgrownup
Seasoned HDF Member
15 Year Member
Loved
Top Answer: 1
Top Answer: 3
Joined: Mar 2009
Posts: 24,709
Likes: 9,209
From: Snow Hill, NC
Default

Doesn't matter, just make sure there is some in there...
 
Reply
Old Aug 7, 2012 | 07:04 PM
  #8  
TWIN CAM 96's Avatar
TWIN CAM 96
Outstanding HDF Member
Joined: Apr 2011
Posts: 2,555
Likes: 6
From: East of the USS Midway
Default

If you don't check your fluids something may not work the next time you need it.
 
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Aug 7, 2012 | 07:46 PM
  #9  
timbo141's Avatar
timbo141
Road Warrior
15 Year Member
Liked
Loved
Community Favorite
Joined: Mar 2010
Posts: 1,421
Likes: 277
From: USA
Default

Remember checking the trans fluid you wipe off the dipstick and put back in hole and do not thread it in like the engine oil dip stick. (At least on a 6 speed trans)
 
Reply
Old Aug 7, 2012 | 08:41 PM
  #10  
EdwardK's Avatar
EdwardK
Road Warrior
Joined: Nov 2007
Posts: 1,800
Likes: 307
From: Houston, Texas
Default

I agree with the others that say you don't need to worry about it unless there is evidence of a leak. There's no where else for it to go and it doesn't have the possibility of getting burned off like engine oil.

That's one of the best things they did when they made the capacity exactly 1 qt. Drain it, pour in a full quart and then put the dipstick back in. Done until next time.
 
Reply



All times are GMT -5. The time now is 10:18 AM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE