1650 rear end thread cracked at diff cover bolt :(

[prskier17]

So I've been going thru the new-to-my 1650.... and today I thought I'd pick up some Hytran, filter, and new gasket. I noticed that one of the bolts that holds on the diff cover was actually a stud with a nut on it. Well I got the cover off and out gushed a bunch of 10w30 looking oil and then I noticed that to PO must have done something to crack the casting of the top-left hole. The casting is cracked at the inside and just the corner of the hole is missing. I don't think this would affect the gasket. The PO had installed a threaded stud and it appears most of the threads are still intact. Do you guys think I should remove the stud and inspect to determine a plan or would you just leave the stud in place? The PO had used a bunch of RTV but there is torn gasket there as well so I'm guessing they half-a$$'d it when they thought it'd be smart to replace the hytran with motor oil. Anyway, your advice would be great. Also... I picked up a 1450 because it has dual hydraulics that I was planning to pick parts from and then sell whatever is left. My 1650 is a 78 with internal brake and the 1450 is older with dual disks. I was planning to sell the rear end and ported hydro from the 1450 but now I'm wondering if I should swap assuming the 1450 is in good condition. Decisions..... ok, time to enjoy my Friday night. Cheers! Chris

[prskier17]

Oh crap.... I just realized the obvious..... that the Hytran will be able to leak out around the stud. Well I guess it might be a good thing that I picked up the 1450. Does anybody know of problems with swapping out a newer (internal brake) rear end with on older (disk brake) rear end??? Should I do a complete swap? What about the hydros? One newer one has the automatic relief valves.

Thanks,
Chris

[maddog784]

The hydro pumps are a direct swap - you shouldn't have any problems switching between. I know that using motor oil when you should use hydraulic fluid is a big no-no. I would be skeptical about whether any damage occurred to the hydraulic pump. The swap-out should not be hard, I believe that all of the connections are the same. Should be 6 bolts, hydro linkage, and brake linkage, and you'll be done Nice find on the 1450 with dual hydros!

[cub1450]

You said it was the top left bolt right?
The Hytran doesn`t get that high.

[jbrewer]

Yes, you should be fine... unless you roll the cub, in which case you'll have bigger problems!

[ol'George]

If it were me,I would not worry about hydro damage using non hytran oil.
They were put in many different brands of equipment and of course "their" oil was better than the other guys oil. We really don't know what type of Hyd oil was used.
Here is an interesting read from the people that make Sundstrand hydros:

http://www.cushmantrackster.com/pay-pdfs/sundstrand.pdf
prolly' more here than you really want to know.

[Jeff in Pa]

Originally Posted by cub1450

You said it was the top left bolt right?
The Hytran doesn`t get that high.

edit-- grabbed wrong picture in the original post ( Thanks Matt )

Here's pictures of narrow frame gear drive and hydro covers

[Matt G.]

That's a gear drive cover...the rear cover for a hydro has the fill hole up much higher, and it would get high enough to splash out of that bolt.

[Jeff in Pa]

Originally Posted by Matt G.

That's a gear drive cover...the rear cover for a hydro has the fill hole up much higher, and it would get high enough to splash out of that bolt.

I edited my post and put up both covers ( I grabbed the wrong picture )

[Sam Mac]

Just use a sealing washer on the outside
http://www.mcmaster.com/#standard-se...ashers/=hsvtyz