Thread: rear maxidrive problems

where did the steel shavings go? Is that a 10, 24 0r 28 spline? Maybe you should upgrade or get a new one to be safe, but first check whether somthing else is out off alignment inside the diff to cause it to burr.

It's a 24 spline the photo shows the diff end.
The burrs could just be from when the locking dog slides in, i'm not really sure.
The oil was pretty clean.

The splines are bent, meaning they've been pushed hard at some stage and were close to letting go alltogether. Definately one for the trophy cabinet. Out of curiosity, what size tyres are you running & do you drive it hard when locked?

Cheers

Bojan

The axles are twisted from the torsional load exceeding the material elastic limit.

It couldn't twist much in the section that fits inside the side gear (because the side gear offers some support and the torque starts to diminish from the outside face of the side gear to the inner end of the axle). You will find that there is a large twist in the axle between the ends but unless you draw a reference line along the length (before the axle is used) you probably can't see it.

Hi-tuff (the material Maxi-drive axles are made from) axles will twist a lot and spring back to normal when the torque is removed, but additional twist exceeding the elastic limit can not be recovered.

The elastic limit is between the endurance (fatigue) limit and the ultimate strength. So the axle will get permanent twist without failing (for low number of load cycles), but it will have suffered fatigue damage that has severely shortened it's fatigue life. It will not be able to survive a large number of load cycles such as it has endured. You can keep using it but don't be surprised (like many are) if it fails when there is little load on it (that is the nature of fatigue).

This is not uncommon and results from using large diameter tyres on small diameter axles.

Yep i've got the excact same twist in my rear 10 spline short side axle, i might get a pic of it..

TIM.

Bush65 is correct.

In addition, the burring of the locking dog collar is normal.

You must ensure you dont engage the Diff Lock with large cross Axle wheel spin, if you do this a lot then the locking dog will burr up at the entrance and prevent engagement. You can engage the diff lock will under load just not high wheel spin between wheels on the same axle.


I'm only guessing but I'd say the Axle,Axles have been over stressed with the Diff Lock disengaged and the now permanent twist on the short Axle is why the locking dog wont engage. The fact that the long Axle is also twisted means you have either stressed it on more than one occasion or you've had air time with both wheels then come back to terra firmer on a hard surface with heaps of right foot. If the stress was caused while the Diff Lock is engaged the axle twist should be outboard of the locking collar, and hence the Diff Locking operation should still work. Would have loved to have actually seen you in action while you did this, I bet it would have made a lot of people cringe....LOL..

I know lots of people with broken centre Diff's because they have forgotten to engage the centre diff lock while playing hard.
2 of them are in my family!

You must really get into it....Good on ya bloke give it 60!

Buzz66 you must have been at vic winch 07.
I planted the right foot launched up a hill, launched off the top, landed with power still in.
Damage - rear prop shaft twisted in two.
-4 teeth of the crown wheel @12 o'clock, 3 o'clock, 6 o'clock and 9 o'clock as the rear axle was at full droop and the tail shaft uni's could not cope.
-spun a bearing on the diff carrier
-chewed out side gears on the short axle side
- chewed out splines on short axle at diff end.
The long axle looked o.k and is the one in the photo.
New hemisphere (old one repaired and built up as a spare)
New short side axle.
The long axle has put up with a bit of abuse and it looks like it will be forced in retirement.
The short axle looks good.
82 2dr inj 4.6 35 simex.

Love your work!

Did you get it on video....Would be priceless i reckon

Wish i was there.

I'm a definate to go and watch the next Extreme Buggy or Crawlers or comp...whatever....just wanna watch.....would be great.

I only thing I have seen comp wise was Monster Trucks in Cairns some years ago. That was pretty cool....OH....and the hill climb at Crusier park.