By Spencer Marks
I just finished replacing my front and rear drive shafts. I drained and put new dif fluid in the rear dif. I went to the local dealer and they told me the fill capacity of the front and the transmission as I want to replcae that as well but they could not tell me how to access the fill. One how do I access the fill for front dif and 2 is the transmission fill the same as the rear dif? I don't see a dip stick or fill for the transmission but all in same area.
Also, anyone can suggest a good shop/service manual for this bike?
I'll start by saying i'm learning as i go & have come a long way, but there are some maintenance issues on my mule sx that must be addressed & i've got nobody around with experience & cannot bring it to a shop.
I've got rolling resistance when i jack up the front wheels. Months ago i thought i was possibly a brake issue but didn't yet have the equip. to pull the wheel hubs or press them back on... but the noise/friction seemed to resolve itself. I just checked up on it because i've got the tools for dealing with the brake system now and i noticed the wheels dont really spin... theres a lot of resistance and i can hear it coming from the front diff. I can't remember if it used to do that before, but i dont think it did. Its not the drive shaft or u-joints, but i've yet to pull them to be certain. it really sounds like its in the front diff. just where the drive shaft connects.
Should the front wheels - when in neutral and in 2wd and no diff. lock - spin freely? Theres too much drag for mine to even go once around. Can anyone point me in a direction? Otherwise its trial and error with cv axles, ball joints, brakes, etc. and i dont have the $ or time for that.
I'm in over my head and really hoping someone can help. I'll try to make a video of whats happening, hopefully the sound will come through well. Maybe that will help diagnose it. Thanks.
If you pay any attention to your UT400, you have probably noticed that the right front wheel tips in at the top a LOT. The left fronts seem to be about right from what I've seen. I look at them all when I'm at different stores just to see if they're all that way, and yes, they all seem to be that way.
There "should" be adjustments on either the ball joints or the inner pivot points, but these are solid, not way to adjust them.
I have the UT400 up on my 2-post lift and the right spindle seems to be around 3-deg tipped in at the top and the left spindle is about straight or maybe half a degree tipped in. This is at full suspension drop, not ride height. I took the shocks off and rotated the spindles from bottom travel to full max up travel, way more than the shocks will allow. The higher the spindle lift, the more tip in there is on both spindles. This is true because of the unequal upper and lower A-arms. It's just the nature of of the dual A-arms and them being unequal in length.
I took the inner pivot 8mm bolts out and inserted a lot smaller 1/4" bolts and pushed the lower A-arm inward and the angle on the spindle decreased. I then took the top inner bolts out and did the same thing, but pulled out instead. This got the spindle equal to angle of camber on the left side. I used the offset in the holes to see how much I need to go on the lower alone. I was also concerned about bottoming out the axle assembly because the spindle centerline will not be a bit closer to the front diff. But as it all turned out, it was not close to bottoming out.
I cut about 1/4" out of the two 1" A-arm tubes as they were welded to the lower ball joint mount casting. I tack welded them back together and trial fit it all together. That seemed to be about right. I took it all back apart and welded it up solid. Now it all looks to match the left side quite well.
Also want to use this in our yard and the stock tires are NOT turf friendly, especially with the solid "spool" rear differential. I found these on Amazon, 25x12-12" and 25x8-12" hard pack race tires as they're called. They're 6-ply and tubeless. The initial probably I had was that the size rating was not even close to the actual size. They said, install and then recheck the diameters and I did. They did get larger, but the rears are more than 1" smaller in diameter than the side wall stamping. Instead of 25", they're 23.75" tall. What I DON'T WANT are shorter tires. I had already purchased the used wheels at 12" to match the original factory diameter, but in hindsight I would now opt for 14" wheels with 4x110mm bolt pattern and would have been able to find a tire in the 27" diameter range a lot easier and cheaper. Live and learn they say.
Here are some pictures of before and after.
I've searched the forum but don't think I found a solution.
I just bought a used 2022 UT 400 with only 31 miles on it. Often I have to rev the motor just a little to get it to shift into forward or reverse. The original owner told me about this and said it needed the cable adjustment that you so often read about. It also jumped out of gear a few times and did grind a little but not very often and only under heavy load like going up a steep dirt road. After reading lots of posts I figured it must be the short shifter throw so I did the shifter extension modification. It didn't help at all. I thought, should I increase the idle speed? The tach reads about 1600 rpm at idle but it doesn't sound that fast to me. It doesn't seem like cable adjustment because it clicks right in gear with just a few more revs. Any ideas?
Thanks for any wisdom.