HD Clutch Recall 2018...Over 200,000 Affected!

[Free Bird]

Mea Culpa Maxima..... I thought it was a tranny door seal too.

BUT.... Did you see the design of the seal to clutch pushrod contact surface!?!.... Rubber/teflon/polymer-of-some-sort surface on metal?????

I am glad Harley's don't fly.....

I REALLY miss cables...... Just sayin.....

 

[Jack Klarich]

Mea Culpa Maxima..... I thought it was a tranny door seal too.

BUT.... Did you see the design of the seal to clutch pushrod contact surface!?!.... Rubber/teflon/polymer-of-some-sort surface on metal?????

I am glad Harley's don't fly.....

I REALLY miss cables...... Just sayin.....

Yeah, I would think Brembo would have a better design

What I want to know is what change did they make this time? This is the 3rd running change I believe. The outer dust boot/ gasket looks pretty cheesie to me, tho the quad ring seal on the piston seals the brake fluid internally, Over all i see more problems with more miles Hope i am wrong To note mine has had no problems in over 18K miles. I have bled mine 2 times now and re lubed the perch @ 5K intervals

 

[Free Bird]

Yeah, I would think Brembo would have a better design

Didn't know if you had seen the working end of the AIM unit MDO found...but I agree with him... this is looking better and better

 

[Jack Klarich]

Didn't know if you had seen the working end of the AIM unit MDO found...but I agree with him... this is looking better and better

View attachment 63911

That is a good looking unit, I have read good reports on this one

 

[MDO]

Didn't know if you had seen the working end of the AIM unit MDO found...but I agree with him... this is looking better and better

View attachment 63911

It seems that the AIM piston has a bigger surface area. I wonder if that, in combination with a different spring, makes the 40% reduced clutch pull possible .

If I have any problems at all with the new OEM parts, I'm dropping the $280 for that unit. It's too important to be messing around.

 

[Jack Klarich]

Side by side, HD one on the right

The AIM looks way better to me

 

[MDO]

What do you think would cause their part to reduce clutch pull ?

I would like to see the back side of theirs like John Maxwell showed on the recall repair in the video.

 

[Jack Klarich]

What do you think would cause their part to reduce clutch pull ?

Depth or length of piston, if you look close you will see the difference in the pocket that the push rod sits in

I am wondering what the bore of the cylinder is? I know it has a steel piston ( The HD Brembo looks to be aluminum)

I n my experience with hydraulics , cylinders with aluminum pistons distort faster than steel, ( they will flex or side load easier) my guess is the heat factor Aluminum pistons most often are anodized surfaces to reduce rust, tho I have seen pretty severe scoring from this also. Mostly from abuse when it comes to fluid changes. Like you I cannot stress how important it is to stay up on the fluid

 

[MDO]

Watching the video, I'm assuming the fluid hydraulic pressure moves the rod to engage the clutch & the spring moves it back???

HD charges $60 for their actuator & AIM $280

I wish I was a machinest, I would R & D the AIM cylinder.

That's ripoff & duplicate.

 

[Jack Klarich]

Watching the video, I'm assuming the fluid hydraulic pressure moves the rod to engage the clutch & the spring moves it back???

HD charges $60 for their actuator & AIM $280

I wish I was a machinest, I would R & D the AIM cylinder.

That's ripoff & duplicate.

The hydraulic pressure moves the piston in and out, the square cut seal seals the piston to the cylinder ( the seal not only seals the cylinder , like brakes it also retracts the piston) Brembo uses the spring to keep constant tension on the piston to push rod IMO

This is a strange design WE have seen this on split wheel cylinders years ago

 

[Jack Klarich]

Here is a look inside the AIM slave cylinder

I see multiple seals on the piston I like this

 

[Free Bird]

What was the story that went along with this picture? I see a chip on the parting surface.

 

[dannymax]

I'm gonna have to swim against the tide on this one as I prefer the HD slave. The AIM claimed 40% reduction in lever pressure is probly due, at least in part, to the reduced surface drag of the o-rings as opposed to a square cut seal and maybe a lighter spring.

Maybe me being 'old school' but I like the tried 'n true design much better and just don't trust round cut o-rings in this application.

 

[Jack Klarich]

What was the story that went along with this picture? I see a chip on the parting surface.

A guy on another Forum wanted to see the inside, so he took it apart

 

[MDO]

What was the story that went along with this picture? I see a chip on the parting surface.

I was curious what gave the AIM actuator 40% reduced pull, i.e. different spring

rate​

& or a bigger piston (more surface area). There is a big difference in price with the HD part at $60 & the AIM at $280:xzqxz:

 

[Jack Klarich]

I was curious what gave the AIM actuator 40% reduced pull, i.e. different spring

rate​

& or a bigger piston (more surface area). There is a big difference in price with the HD part at $60 & the AIM at $280:xzqxz:

Bigger piston, I also like that the piston appears to have 2 o ring seals

 

[Free Bird]

I'm gonna have to swim against the tide on this one as I prefer the HD slave. The AIM claimed 40% reduction in lever pressure is probly due, at least in part, to the reduced surface drag of the o-rings as opposed to a square cut seal and maybe a lighter spring. Maybe me being 'old school' but I like the tried 'n true design much better and just don't trust round cut o-rings in this application.

Interesting point. From an engineering standpoint, the elastomer square cut seals are generally used more in static sealing applications than dynamic ones. If the materials, compression and gland fill on the o-ring is right, it can provide the needed seal reliability. Quad rings would be an interesting test (assuming there is an opportunity to improve on the improvement :laugh

 

[Jack Klarich]

Interesting point. From an engineering standpoint, the elastomer square cut seals are generally used more in static sealing applications than dynamic ones. If the materials, compression and gland fill on the o-ring is right, it can provide the needed seal reliability. Quad rings would be an interesting test (assuming there is an opportunity to improve on the improvement :laugh

IMO an O ring type seal will stand up better than a conventional square cut seal

We are dealing with heat and constant pressure here to seal the fluid , A hostile work place if you will

 

[mrbob]

Recall

I got the call this morning and went to the Harley dealer, took 1 1/2 hour and out the door.

 

[MDO]

I got the call this morning and went to the Harley dealer, took 1 1/2 hour and out the door.

Good to hear. I'm getting my 1st. shakedown ride tomorrow to test it out.

Did you notice any difference in the operation?