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broken rear casting on tractor

O

oj

Member
I was baling hay a couple of days ago when my gearbox oil pressure light flashed at me (never seen it on except for startup), anyway, got out to investigate, and oil is pouring out of the rear end, from above the hitch area... Shut everything down, and once the oil was all out i could see a chunk of cast approx 1 inch square sitting on the drawbar hitch frame, sure enough there is a hole in the base of the casting (on the mid line). I'm not certain for sure (not got it home and tore apart yet) but i figure something (a bearing maybe) has let go and the pto gears have grabbed it and forced it into the casting, braking a chunk off.

Anybody had any luck welding the broken chunk back in?? Or should i start looking for a casking from a wrecker.

Tractor is a 1994 MF 3670 (160hp) with approx 5500 hrs on the clock. It is my main tractor, does all the hard work.

Any other ideas?? Thanks guys.
 
You might want to look for a complete unit that you can swap out. It could be quicker and cheaper that fixing what went wrong. I would not want a welded casting on equipment that has to make a living.
 
The cast iron on a tractor is some very good stuff and is not hard to weld if you know what you're doing.
Follow the link below for a slide show of a transmission repair I helped my pal Kenny do on a Ford 5000 a couple of years ago.
click here
 
If it is as you figure, and is a non-load-bearing (not a drawbar attaching point), broken by a damaged PTO drive gear, I would consider getting it good and clean (totally free of oil) and epoxying the chunk back in.

Making a lasting weld in the casting would require complete dis-assembly so it can be properly pre-heated, welded, then cooled slowly, and I"m gonna GUESS that would be a heck of a job.

Depending upon how accessible the broken area is and other details, perhaps it could be "stitched", for strength, then epoxied to prevent oil seepage.
Stitch it
 
The real issue is what caused the chunk to break out. If the chunk is in a none important area I have seen guys just make a flat metal patch and drill and tap screws to hold a "cover" over the hole.

If it is in a bearing area than getting it welded where the bearing is setting correctly would be hard.

It might be better to replace the housing. You should be able to find a donor tractor easy enough. That model of MF is know for having issues in the rear end and transmission. I would replace the housing since it is your main tractor.

Would it just be cheaper in the long run to just up date now to a better tractor????

Maybe try to find one like yours with a bad motor and switch it.
 
If something punched the hole out from the inside I would find out what it will need to fix the insides. On a 20 year old machine, you may be ahead to find another tractor with a bad engine and make one good one out of the two.

The guys on the MF forum below might know if this is common on your model and what are the best fixes.
 
Finding one in a salvage at a reasonable price might be hard. Even ones that have gone thru a fire go for more than I would pay.
Not sure what type cast is in the "newer Massey's. I use 99% nickel rod for cast. Have welded on Whites and Olivers with good luck. John Deere not so good, Case-IH had good luck.
I would be tempted to try it with preheat, weld, hammer, postheat a couple times method. Runs a crack forget it.
I agree with JDseller about patching if it is in a low stress area. The only thing I would do different is either make a gasket or use silicone between the patch and housing.
 
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