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JD 630

M

Marlettj

Member
Engine used to run great. It has sat 10 years. It looks like the last time it was run the crankcase was full of gasoline and cleaned everything up. It will only turn over with excessive help with wheel and clutch bolt with bar. Removed Pistons. Still almost impossible to tun the crank over. Seems bearings are dry, I see no rust.
Do any of you have any ideas that would help free the crank shaft up. Every thing inside is very clean and dry No Rust.
Thanks :D
 
When you turn the crank, there are gears and bearing in the first reduction cover that turn also. May want to have a look inside of that, and you could pour some oil on the mains and let it soak into the bearing.
 
Thanks, I didn't think of the reduction gears, I see the governor gears are dry. Do you think just pouring oil on the mains it will get into the bearing?
 
Get a squirt can and pump oil on everything that turns, go easy and turn the crank slow, unless you've a big rust problem, it will free up, make sure oil gets into oil pump too.
 
Been several past postings even with good pictures of how the rubber packing swells up and blocks oil off to the mains of these tractors. Yours may have this issue ? Guys have been adding a little pipe nipple from a light fixture to support the packing from collapsing again.
 
(quoted from post at 13:08:25 05/01/16) Been several past postings even with good pictures of how the rubber packing swells up and blocks oil off to the mains of these tractors. Yours may have this issue ? Guys have been adding a little pipe nipple from a light fixture to support the packing from collapsing again.
Click to expand...
I what subject would I have the best search results from. I don't understand your nipple recommendation.
Thanks for your imput. All is appreciated. That goes for all you guys on here!
 
I am willing to bet that at least one bearing is scored. I would not try to turn it at this point and do more damage. if you take crank bearings out now maybe you can get by by polishing the crank and replacing the main bearings. I have a 630 and have been thru this. Mine cracked the piece that the bearing is pressed into costing me more money!
 
Here's the nipple that Mike mentioned.

It's ordinary threaded lamp tubing found in any hardware store.
a225494.jpg

a225495.jpg

Example of lamp tubing
 
Update on 630 if interested.
We broke it free with a Hyd hose from the 530 to the spark plug hole #1.
Opened head up left side rusted and a bunch of crud. Pulled Pistons rt. Looked good. Left had 2 stuck rings. Nothing broke.
Crank still turned hard.
What we ended up finding was the right main oil line (packing) had plugged up and the outside of that bearing was all crudded up and making it hard to turn over.
We cleaned everything back up (no new parts other than pipe nipples and gaskets) Got it to fire up today sounds good, no smoke. Need to do some carb work. Sitting did it no good either.
Root cause appears to have been gas degraded the fuel filter diaphragm and all the gas went to the crankcase.
Thanks to those of you who helped me with ideas and suggestions. This forum is a great asset to people to share knowledge.
Thanks again and have a great summer
Jim
 
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