rick deere
Well-known Member
What are the different ways motor oil can get in transmission on two cylinders
- Thread starter rick deere
- Start date
rick deere
Well-known Member
number series 720-730
rick deere
Well-known Member
can this happen fast
rick deere
Well-known Member
friend has 620 doing same thing.
Yes it can happen fast.
My 630 went from not using any oil, to using a quart an hour in one day. I was lucky to catch it. Of course it wasn't burning it - it was running out the rear axle seals. I checked the rod and main bearings and changed the crankshaft seals, and it went back to rarely ever needing any oil added.
My 630 went from not using any oil, to using a quart an hour in one day. I was lucky to catch it. Of course it wasn't burning it - it was running out the rear axle seals. I checked the rod and main bearings and changed the crankshaft seals, and it went back to rarely ever needing any oil added.
Bob Harvey
Well-known Member
By pouring the stuff in the wrong hole ?
BushogPapa
Well-known Member
Have your friend check for Bearing Clearance of the Rt Main bearing..
Just use a Dial Indicator and lightly raise the Crank with the dial indicator in place..should be approx .005 to .006" Mine was .074"..
Engine oil pouring into the trans.. turned out to be the Rt Main AND rt Rod bearing were shot, due to a blockage in the rt Bearing Quill.
An "O-Ring" JD called a "Gasket" had deteriorated and Plugged the passage..
Engine never made any noise..but would have soon..!
BushogPapa
Well-known Member
The Letter series is different from the Number series..
rick deere
Well-known Member
Thank you that sounds about whats going on.
rick deere
Well-known Member
on my 730 that has a lot of blow buy needs rings, I'm going to replace rings, should I see if this stops it or just go ahead and replace and ck left and right seals and ck crank bearings.
I'm not a mechanic - there are many others on this forum who can give you knowledgeable advice. After disclosing that - if I was gonna open it up, I'd certainly check the seals and bearings. The little O-ring that Bushhog Papa mentions will sometimes swell on the 630. It restricts the oil supply to the right main and right connecting rod. I don't know if the 730 has the same design as the 630.
Bushhog Papa has a neat trick with lamp tubing to keep the o-ring from swelling. Here's his idea:
Bushhog Papa has a neat trick with lamp tubing to keep the o-ring from swelling. Here's his idea:
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