loud front diffs why ? - Page 21 - Polaris RZR Forum - RZR Forums.net
RZR XP 4 Turbo Discuss the Polaris RZR XP Turbo EPS 4-seater here!

View Poll Results: Is your 16 xpt4 front diff extremely loud or quiet over 30 mph?
loud 104 74.82%
quiet 35 25.18%
Voters: 139. You may not vote on this poll

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post #301 of 307 Old September 28th, 2018, 06:58 AM
 
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Re: loud front diffs why ?

OH NO,, not doing it, just curious. Thanks for the reply. I know people with the older 4x4 trucks would sometimes pull the front drive line and run them. As far as the weeds wrapping, seems it would do that with or without the shaft. In any case, again thanks for the reply. I have pulled the shaft on my old 2010 and not really wanting to do it again
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post #302 of 307 Old September 28th, 2018, 07:29 AM
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Re: loud front diffs why ?

With a name like Gunmaker, I couldn't 'not' reply. Black rifles are my other passion.
I bet if I used the term Fo, 87, beans, you would know my other favorite forum.
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post #303 of 307 Old September 28th, 2018, 07:41 AM
 
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Re: loud front diffs why ?

Polaris uses NET Forged straight bevel gears in the front drive(not a differential) in these units. They are net forged gears meaning there is no machining on the ring or pinion face(cost savings) they are strong but very, very, loud and they have a very high NVH. This is not a cut spiral bevel gear set like in a traditional front or rear differential in an automotive application that most people use as a benchmark for NVH.

It is what it is and they will be loud until Polaris changes to a cut gear set in the front drive. That will be more cost or more LCC parts.
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post #304 of 307 Old September 28th, 2018, 07:54 AM
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Re: loud front diffs why ?

Good point.
For those who have never split their diff to inspect or repair,
The entire ring and pinion have a 'cast/sand blast' type surface.

True automotive gear sets will be polished to a specific surface specification and then,
interference fit/shimmed for obvious reasons.

Knowing that, even if one were to disconnect either shaft or the diff magnet,
the front axles will still be spinning the ring and pinion under certain circumstances if not all the time.
Not enough to turn a wheel on its own, but under zero load 'I THINK' the gears would still spin.

Pros..... please verify or teach me otherwise as I am sincere in asking.

My engineering experience will get me a cup of coffe 'sometimes' and that's about all it's worth if your not experienced in the field you are currently discussing.
Kinda like going to a Gynecologist with 30 years of experience when you have a brain tumor.

As you may suspect I've run into many who's opinion begins with 'I'm an engineer, therefore I must be right).

Experienced (my term for Pros), many who do this 80 hrs a week for a living are appreciated by me on these forums.
Sorry for the rant...........
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post #305 of 307 Old September 28th, 2018, 08:16 AM
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Re: loud front diffs why ?

Some examples of my 2nd diff ring and pinion bear, in process of rebuild as parts arrive.
Notice the teeth on both gears. The contact surface is rough as is typical of a Garden Tractor application.

I'm throwing out a business opportunity to some of the excellent machinists on this forum.
If a jig could be constructed to ground and repolish the teeth at the correct angle, I think many would use this service (If it doesn't already exist).

Thanks VinnieMaxx as is usual I overlooked the common sense issue. I don't think I have read this obvious observation of at least one source (of many).

One day, a manufacturer will be designing a hydrostatic drive for these machines and all of this will be a bad memory.
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post #306 of 307 Old September 28th, 2018, 08:56 AM
 
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Re: loud front diffs why ?

Straight bevel gears are noisy period. That being said my 2016 XP1K is pretty quiet I cannot even hear it at all. You can remove the drive shaft to the front drive if you want no code will be generated. The front drive is a over running unit. All of the parts are moving all of the time but no torque is transmitted to the front tires unless the 4WD switch is active and rear tires slip or spin in mud, sand, snow or whatever now the back tires are spinning at the same over running speed (ratio) of the front drive and torque will now be transmitted through the front drive to the tires. Rinse repeat.
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post #307 of 307 Old September 28th, 2018, 09:12 AM
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Re: loud front diffs why ?

Cut and pasted from Straight cut gears vs helical | Automotive Thinker - Discussing the finer points of automobiles


So why are straight cut gears used in race transmissions? Well, there is only one real reason, and that is because straight gears donít produce any axial loads (thrust loads). Its very easy to build strong gears that are either straight cut or helical, so thatís not the problem. The problem is when you start putting a lot of torque through helical gears, the axial loads become so high that you need a very strong transmission case and shafts (axles) to contain the loads; this can add significant weight to the transmission. Straight cut gears simplifies the transmission case design and also the types of bearings used. This allows for a very light weight transmission to be designed Ė and we know that weight is everything in a race car. The one negative of straight cut gears, and its a big one, is that they produce a lot of noise.
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