Rear Axle Failure, Max 28, Service Manual Pages?

[mike69440]

Is anyone able to post .pdfs of the service manual pages related to removal and service of the real axle assembly?
Parts list, exploded views etc.?


I drove through into a hole, nothing huge, something hung up a bit,, and right after axle is loose and leaking oil. I hear something broke internally.

I really would like to do repair myself, as tractor service is incredibly expensive, and I do not trust the quality and and skill of the service.
Much appreciated.

Thanks

 

[doneill127]

Don’t have a service manual but here’s a link to mahindra exploded parts manual for the drivetrain.

https://parts.mahindrausa.com/dealerview/Category.aspx?Type=Figure#

 

[mike69440]

Worse!!
I'd consider buying an insurance claim, (fire etc.) on a Max 28 or 28 for the parts.

 

[mike69440]

https://parts.mahindrausa.com/dealerview/Category.aspx?Type=Figure#

Link does not work, I think you have to gave a username and password.
In any case i figured it out

 

[arto98607]

Worse!!
I'd consider buying an insurance claim, (fire etc.) on a Max 28 or 28 for the parts.

Ouch, that looks like an expensive piece of casting.

Hopefully you can get one this year?
I would sell the tractor soon after.

 

[doneill127]

I saw that the link didn’t work. Try this. If it gets you there, there are 18 pages of diagrams on the drive train.

https://parts.mahindrausa.com/dealerview/illustration.aspx

 

[mike69440]

I saw that the link didn’t work. Try this. If it gets you there, there are 18 pages of diagrams on the drive train.

https://parts.mahindrausa.com/dealerview/illustration.aspx[/URT

Thanks, I found the Part, Ouch, $$$$

 

[mike69440]

Ouch, that looks like an expensive piece of casting.

Hopefully you can get one this year?
I would sell the tractor soon after.

Too many mods and accessories to sell.
A bit more Iron thickness around the bearing housing would have prevented this.

If I owned an aerospace NC machine shop, I could sleeve it with a very complicated sleeve I could design using SW so it would be stronger than a new Housing.
The programing and set-up would be a killer. $$$$

The Axle lock dog is just cast iron crap. Should be hardened steel. No wonder, it was so piss poor to engage. May repair it by welding up some hard facing build up and hand grind.

I'll replace the bearing that go a bit of metal in it.

Damn, this is going to be a project.

 

[s219]

Wow, that is unfortunate. I tell you, after seeing all the problems my neighbor has had with his Max 28, I would never recommend that model series to anyone. Since they are Mitsubishi made I had expected them to be good, but they are just not well made compared to other models and brands. Wiring and hydraulics have been the typical failure points for people, so seeing this is a new one for me.

 

[s219]

By the way, any theories as to how the load transferred to that spot to break there? Seems like the outer case didn't really provide any support to the axle at all? Was it a side load that maybe put a "thrust" on the inner bearing?

 

[arto98607]

Not really trying to defend the brand because I believe they all have issues. But I believe the OP has modified the tractor with larger cylinders on the FEL and tweaked the relief valve for a little more pressure. Maybe increased loads higher then design may have contributed to the failure.

Been following this forum for about 9 years and first failure of this type that I can recall.

Wouldn't that affect the front axle longevity rather than rear axle?

 

[doneill127]

Deleted my post not my business

 

[mike69440]

What you see is what you get.

the casting designers newer spoke to the casting engineer.

The other weak point is that the Axle lock dog in made from most likely 12L14 mild steel, So if you use it ,be very gentle and use only in an emergency, otherwise at best you are grinding metal chips in your hydraulic oil reservoir.

Thank you Mitsubishi/ Mahindra.

 

[mike69440]

Wouldn't that affect the front axle longevity rather than rear axle?

Did same to my Kubota L39 with 4X the hours. L39 now has a leaky diverter valve but otherwise for a wimpy front axle and only 40 hp, incredible machine ( This was fixed in the L45 & L47) What a beast, as they should be for $70K

 

[mike69440]

Well I have a fix, will post info. If it works, the other side will same get reinforcement.

IF MITSUBUSHI Fixed the Axle lock, beefed up the bearing support of the casting and use roller bearings vs ball bearings in the axle and as far as i can see the Max26-Max28 would last forever. Shame the F__ed up a basically stout design. The axle housing is also too narrow as bearing spacing should be increased.

If you were pulling a plow and caught a root or a rock, this could happen to you.

 

[mike69440]

At the Point I start to put it all back together.

Mitsubishi Max26/28 you need to go into it eyes wide open.
Max is 99% really heavy & well built. It is that 1% that gets you.
Heavier built and higher capacity than most tractors it size. if you can get it for thousands less, worth considering if only if you have need for a little beast, as the Max26/28 has some deficiencies.

Engineered with buy out spec'd generic parts, as opposed to Kubota vertical integration where they build everything in house, causes lapses in quality and engineering.

Shows up in electrical and hydraulics, fitting plastic paint, etc.

No excuse of the following either.

The differential casting is inherently weak in axle bearing support area, Phots show this.

Also the dog of the axle lock is made of mush metal.
Metal chips can get in the bearing. A shielded bearing or a bearing slinger would help.

I realize the Max28 is made by Mitsubishi and sold as a Mahindra and Cub Cadet.
Kind of explains why Toyota/Kubota is better car than Mitsubishi Auto or Tractor.
Not that Kubota doesn't screw up, but less likely given the company culture.
Note in photo what is tossing around the Max28.

 

[mike69440]

More Pics

 

[SHdrinker]

Looks like the max28xl rear end is almost identical to my 2415 that broke in almost the exact same spot.. How is this fix holding up for you? I just bought this tractor and did not know it was broken, I'm curious what caused it. You said you just hit a hole?

Mine also has the same axle lock as yours. How did you modify it so it won't act as a metal shaving dispenser?

 

[mike69440]

That sucks you got stuck with a broken tractor. Bet the bill of sale said "As Is"
Regarding my repair, using 3 Lbs. of epoxy I suspect repair is stronger than original Cast Iron. Plus 10,000 psi compressive strength.
I added epoxy to both sides.
Tractor is not back together yet. It is going to tale a while. Heart surgery due on the 8th of September & parts not in yet.
Repair is a real pain.
In any case I polished the activation arm on the diff lock so it will not tear up the bearing surface and will try one of the following between the arm and the Dog sleeve.
(Part 13 and Part 20 of Fig 511)

McMaster-Carr

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or

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

However.

If you engage the diff lock, try to do it at a stop or rock it gently to lock.

Me bad. I was engaging in motion, and letting it grind till it engaged. This is not an Eaton locker by any means.

 

[mike69440]

There is a drain plug on the Diff housing to drain the oil from the Axle housing area. Suggest everyone drain the the side where the axle Lock is to see if there is metal in there?

Magnetic drain plug would not hurt here also.

The axle housing is cast aluminum. I would have thought this was the weak point, but not so. Still, as aluminum housing makes sense manufacturing and machining wise, maybe beef the casting up maybe 25-30%?

Spherical Roller bearings in the axle would be a last forever improvement over ball bearings.
Mahindra should pay me for my engineering knowledge.