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srukke's avatar
srukke
Explorer
Jun 06, 2014

Rear seal leak on Cummins and need to pull Allison MD3060

I'll start by saying I am very mechanical, rebuild engines pull and install engines, trannies etc.
But my RV has an Allison MD3060 behind, rather in front of, a Cummins 230hp on a Winnebago pusher. 1993. Great running rig with a rear seal that leaks on the Cummins. The MD3060 is big. Anyone know the weight? Is this doable with a couple guys and a tranny jack? The job seems simple enough it's just the sheer size that gives me pause. Anyone done it and have advise? If I do trannies I usually replace the front tranny seal while it's out. Is that something I would want to do here too? Any specialized equipment other than a heavy tranny lift that's needed?

12 Replies

  • Here is the link to get into the Allison Source Documents. The will likely have all the info you might want.

    FWIW you will be working under, not on, your MH. This equipment is killer big. Do you have air bag suspension? You will need to block the travel so a sudden air loss doesn't crush you. Pick up sized equipment is too small for the most part. I use a 22ton air/hydraulic jack and 12ton jack stands on a concrete pad.

    Be Safe!
  • The transmission weighs in around 500-600 pounds, you will need a large jack. Replacing the front seal on an Allison is not like smaller transmissions, it does not slide out like the little ones.