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Implement Alley Discussion Forum

replacing oil seal in rotary cutter

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Tom R

04-20-2005 10:00:43




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I'm new to full sized tractors and implements. The Ford 600 tractor I bought came with a John Deere model 506 rotary cutter that is fairly rough. Oil pours right through the gear box. What's the easiest way to replace the bottom seal working by myself? Can I stand the mower on its side (leaning against a tree or fence post) to get at the bottom of the gear box?
I understand the working of the gear box--it's just the size and weight that has my worried.

Thanks in advance for any help!

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Jimin NC

04-20-2005 19:05:24




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 Re: replacing oil seal in rotary cutter in reply to Tom R, 04-20-2005 10:00:43  
I don't know what others may think of the way I have fixed 2 bushhogs with a similar problem, but here goes. My bearings were still good so I simply filled the gear boxes with grease. I took the fill plug out and used a grease gun. I check them a couple of times during the growing season and refill as needed. I have run one this way for 10-15 years and the other for 5-10 years. This was much easier for me than dealing with those big, rusty nuts and bolts. Very little grease is slung out. Good Luck!

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Jimin NC

04-20-2005 19:04:46




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 Re: replacing oil seal in rotary cutter in reply to Tom R, 04-20-2005 10:00:43  
I don't know what others may think of the way I have fixed 2 bushhogs with a similar problem, but here goes. My bearings were still good so I simply filled the gear boxes with grease. I took the fill plug out and used a grease gun. I check them a couple of times during the growing season and refill as needed. I have run one this way for 10-15 years and the other for 5-10 years. This was much easier for me than dealing with those big, rusty nuts and bolts. Very little grease is slung out. Good Luck!

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supergrumpy

04-20-2005 13:34:46




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 Re: replacing oil seal in rotary cutter in reply to Tom R, 04-20-2005 10:00:43  
if you tip it over right away, you can get to the underneath but might not be able to get big rusty bolts/nuts on driveline/rotor off

I leave my mower/driveline attached to tractor and lift it way up, block it up in the air with huge blocks so it cannot come down, getting crushed to death is no fun

soak nuts/bolts in your favorite loosener, to get driveline nuts loose, put pto in gear, engine should be off by the way unless you are polish

usually need 1 3/16 or so sockets and huge breaker bar, do not take them all the way off

after they are loose, then tip your mower on side, if you remove bottom of unit while it is right side up, lower center hub/spacers/bearings all drop in the dirt and you will never figure out right way to get them back together

if bearing is shot, new seal won't last long

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Tom R

04-20-2005 18:59:58




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 Re: replacing oil seal in rotary cutter in reply to supergrumpy, 04-20-2005 13:34:46  
Thanks for the advice. I'm not too keen about working under the mower even with blocks, but I can see your point about needing something to hold things steady. It takes a good sized breaker bar to do the job on a gravely deck half the size.

I just got a parts diagram from the Deere web site. It shows the bottom of the shaft being splined with a cap screw in the end. This might make a difference on the amount of force needed.

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supergrumpy

04-20-2005 13:32:38




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 Re: replacing oil seal in rotary cutter in reply to Tom R, 04-20-2005 10:00:43  
if you tip it over right away, you can get to the underneath but might not be able to get big rusty bolts/nuts on driveline/rotor off

I leave my mower/driveline attached to tractor and lift it way up, block it up in the air with huge blocks so it cannot come down, getting crushed to death is no fun

soak nuts/bolts in your favorite loosener, to get driveline nuts loose, put pto in gear, engine should be off by the way unless you are polish

usually need 1 3/16 or so sockets and huge breaker bar, do not take them all the way off

after they are loose, then tip your mower on side, if you remove bottom of unit while it is right side up, lower center hub/spacers/bearings all drop in the dirt and you will never figure out right way to get them back together

if bearing is shot, new seal won't last long

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