Hisun Sector 450 (2021) - help diagnose rear diff issue (short video included)

[camojay]

When we first heard the noise, we immediately stopped driving it...at first we thought it might be a linkage issue, but after further inspection looks like the sound/jolting is coming from the rear diff. Took a video below...

Anyone know what is creating the diff to skip/jump like this? We drained the diff oil and didn't look terrible, no metal.

Other info that may be useful:

1400 miles on it

Recently tightened the E brake

P.s. never posted on this forum before, let me know if the video does not work

 

 

[Greg Kilgore]

Have you watched the driveshaft when this is happening. I have an Axis 500. And had the splines on the drive shaft bad and the cup on engine bad. Replaced both and have been great for almost a year.

If not the drive shaft/cup, then I going to guess it is something inside the rear differential.

As far as the video goes. It would be better to upload to YouTube. Set it to anyone with a link and post a link to it. I had to download and play with VLC to watch.

Were you on a hard pull, level or going uphill when it 1st happen?

[camojay]

Thank you for your response! We tore apart the rear diff and you are 100% correct. The splines inside the rear diff and drive shaft/coupler piece were stripped. Poor design... no zerts to grease it and it was pretty badly rusted out. This issue began by simply pulling out of the driveway after it had been sitting a few days. The use before that was also mellow, level ground, nothing difficult or torquey. Just rusty and hit it's limit. 

FYI for anyone with sinar issues, ee found good prices for the HiSUN Sector 450 parts via telephone from Yarborough Equipment in Strafford MO. 

 

[aefron88]

There have been several reports of this on various Hisun models. Seems to be more metalurgy or heat treating issue than corrosion since the threads seem to strip out. Should not be any real reason for additional grease past what it takes to assemble the splines initially, so I dont see it as a grease issue, just soft metal that strips out.

[Abbingdon]

I have a HiSun Sector 450 with a bad rear differential, I am wondering if one for a 500 would work 

thanks 

Dan

[Greg Kilgore]

Abbingdon,

You can probably go to Alpha-sports and search the parts diagrams and compare the part numbers.

You should also compare the part numbers for the front differential as well.

Because just like a 4x4 automobile, when the utv is in 4 wheel drive, if all 4 tires aren't pulling the same. Something else will brake.

FYI even different size tires on the front and back on a 4x4 automobile can cause damage to the 4x4's drive train.