Mine had a growling noise in the ADC also. The front diff looked perfect and the fluid. The dealer said they get that way with very little use. He said to use it more often and the noise should get less.

Just what I was told. Not sure how much truth there is to that. I rarely use the ADC myself.

 

Some things do have problems with non-usage,but non-usage of the ADC system itself wouldn't be one of them IMO. Maybe non usage of the machine could allow moisture build up in the diff...but then the fluid wouldn't look good.
If that theory were correct it would be real noisey when new
The ADC clutches ride in the diff fluid...that is my understanding of what gets dirty and causes the chattering...the clutches are turning when you ride...they just don't have pressure on them from the ADC system. Once the ADC coil is engaged a cam turns the ADC pump and puts pressure on the clutches efectively braking the front diff.

Like I said in the thread you had...top 2 reasons I have heard are air and fluid condition.
Hard to believe the fluid ldiff ooked good...the inital fluid gets nasty quick during break in...
I wonder if they even attempted to bleed the ADC system or checked the fluid?

JMO..
I rarely used mine on the 800 or the 850. The 800 never made a peep and the 850 only groaned a littl when I turned it on for the heck of it while pulling a heavy trailer down a hill...due to the extreme load on the ADC clutches I imagine.
But maybe there is a hint of truth to it...if the fluid condition or air causes the ADC clutches to chatter and you use it the clutches might eventually wear down enough to quieten? But that wouldn't be my preferred method of quietening the noise.

 

Ya, not quite sure. That is what the mechanic said. He noticed it on quite a few Polaris's. First question he asked is, do you use it often. I used it just a few times to try it out.

I looked at the fluid myself to check the level and to see how it looked. The fluid looked and felt like new, and was at the correct level.

I didn't know the ADC unit uses the front diff fluid. Why would there be a reservoir for the ADC?

 

I'm wondering why you guys are riding around with your ADC on in the first place?

It's my belief that you would only use ADC when going down a VERY steep hill and you don't want the rear-end to slide-out.

 

It uses the ADC fluid to compress the clutches against the diff,but the clutches themselves are in the diff fluid. Basically,from the way I understand it the ADC system(pump) provides hydraulic pressure forcing a piston or something simlar into the clutch packs forcing them up against the diff providing braking to the diff. So the ADC fluid doesn't come in contact with the clutches themselves.
I may have mis spoke about the clutches always rotating...they may be slpined to the case..and pressed up against the diff ..not sure exaclty,but in any case they are in the diff fluid. And I don't see how non-use would effect the system,unless we were talking a long long time...but hey I could be wrong...maybe that is the case. Generally any type of clutch submerged in diff fluid requires a friciton modifier...maybe the old Polaris diff fluid's friction modifier just doesn't last? I know I heard rumor there is a new fluid which seems to work better and eliminates the groan...

Here is a general cutaway,you can see the ADC clutches(one side,there is a clutch pack on both sides)


When you checked your fluid had the machine been ran recently? And how did you check it for cleanliness,through the fill hole? If it hadn't been ran recently and/or you just got a little on your finger you might be suprised at what it would look like when drained.
And there is always the possibility of air in the ADC system..again it is a hydraulic system and I ASSume that air in the system could cause weak clutch pressure which might let the clutch chatter instead.

Who is just riding around with the ADC on? I must have missed that post.
I rarely used mine...basically understanding how it works leads me to believe,like anything else with a fiber type clutch,slipping means wear...I doubt the ADC is any different...but it is designed to slip(if it is on and engaged it is slipping clutches so to speak) so I imagine it's clutch material is suitable for that but still..has to wear it more that being turned off IMO.

 

Not to wander too far off the ADC issue, but back on the axle topic....how many of you guys had both rear axles replaced only to have the clicking continue? I've had both rears swaped out, and then the right rear a second time (the dealer thought the original swap must have been one of the older mis-machined ones sent by accident). Anyway the clicking continues!

I've got it back at the dealer and I'm trying to press the issue a bit harder to see if it can be fixed. I know they say it's only noise and not a function issue...however it REALLY annoys me and I just can't stand the fact that this machine cost this much and clicks along.

-mark

 

Who want's to ride a 10k machine that sound's like that. Mines been in the shop for 2 week's, nitwit's sent one wrong length axle! Ought to have it back this Saturday hopefully. They also did the recall on the front balljoint's, or so they say. I'm going to check for the noise before I put it back on my trailer..

 

They change my 2 rear axle the bushing in the back and 1 set of bushing at the front .when they do my recall for the front steering ,mine don't have any slack in the ball joint so they just replace the bolt and torque it whit the new spec.

 

Mine was fixed immediately within 1/2 hour of bringing it into the shop. It took the tech like 10 minutes to replace one axle. They only replaced one side, and I could still hear the noise, although faintly after taking it for a test ride, so they ordered another without blinking. Great service and an awesome machine so far.

I'm told by the Polaris tech that the axles were machined slightly too long, which causes the clicking from pressure.

For those in the northern tier of the USA, they replaced a valve that is said to freeze under very cold conditions. I'm glad they replaced the valve, but nothing ever froze on mine last year plowing or riding the trails.

 

I dont' believe it's in the manual as part of the initial fluid change. My ADC fluid is perfect after close to 700 miles. I used it a couple of times with no noises, but no more than that. The engine braking on the 850 seems to be enough is most cases. I'd keep an eye on it going forward. Will keep an eye on my own as well.