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Greg S. 
Bronze Level
Joined: 23 Jul 2017
Location: Saskatchewan Ca
Points: 9
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 Topic: 720 Brakes seized
Posted: 04 Dec 2020 at 9:26am |
I bought a 720 2 years ago that had been sitting for many years due to a seized brake, when I took it apart I found the spring rusted off and an abundance of rust. In the meantime the other side has seized as well. Is this a common problem? Does anyone have a solution to keep the water out of the brakes-keep them from rusting?
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AC720Man
Orange Level
Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 5070
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Posted: 04 Dec 2020 at 8:17pm |
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Keeping them in a shed, not being a smarty pants, but its true. Or at least keep it very well covered up. A lot of equipment sits outside and unfortunately weather such as rain is hard on them. It gets in to moving parts and causes things to rust up. I know everyone may not have a building to put them in so double tarp them making sure water runs off away from the tractor. I have 2-720’ s that have been shedded and having good brakes were never a strong point. But the excellent hydro makes up for it.
Edited by AC720Man - 04 Dec 2020 at 8:21pm
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Bird76Mojo
Silver Level
Joined: 12 Mar 2015
Location: Illinois
Points: 221
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Posted: 06 Dec 2020 at 3:19am |
The way these were built, the rear brake system is directly open to the elements from the top. A very poor design. I used some closed cell foam and sprayed it with several coats of Plasti-Dip in an attempt to keep excess water out of them. I'm just hoping it sheds water off to the front or rear instead of letting it go right in to the brake area... I also rebuilt both drop housings and installed new brake springs after thoroughly bead blasting all parts. John Deere still has the exact same brake springs available for these tractors. They're also on Ebay. M831T is the Deere part number. Do yourself a favor and replace them all while you're in there..
Edited by Bird76Mojo - 06 Dec 2020 at 3:24am
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AC720Man
Orange Level
Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 5070
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Posted: 07 Dec 2020 at 8:44pm |
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Cutting a piece of large inner tube and laying across the trans so it lays over each frame edge may help. Just cut out the holes where the seat bolts down. Would act as an isolator where the seat bolts down as well. Just a suggestion to help the water to run off.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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DSeries4
Orange Level
Joined: 12 Sep 2009
Location: Ontario, Canada
Points: 7391
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Posted: 07 Dec 2020 at 9:24pm |
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Never heard of them rusting. Most have the same problem that mine did - leaking axle seals soaked my brake pads in oil! At least they did not rust :)
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '61 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Greg S.
Bronze Level
Joined: 23 Jul 2017
Location: Saskatchewan Ca
Points: 9
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Posted: 09 Dec 2020 at 9:25am |
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Turned out the second brake was not seized, the gear case had water, no oil, in it and was froze. I should not have assumed that brake was seized.
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Greg S.
Bronze Level
Joined: 23 Jul 2017
Location: Saskatchewan Ca
Points: 9
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Posted: 11 Dec 2020 at 9:00pm |
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Thank you for the tips
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