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IBWD MIke 
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Joined: 08 Apr 2012
Location: Newton Ia.
Points: 3868
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 Topic: Powermax Hydro Rebuild
Posted: 06 Jan 2018 at 5:35pm |
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I've got a line on a Simplicity Powermax not sure which model exactly, but it's the same as a 720. It has a bad hydro in it, how much would it cost roughly to get this thing overhauled?
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ac720nut
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Joined: 09 Feb 2016
Location: Dexter Mi
Points: 1217
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Posted: 07 Jan 2018 at 5:38pm |
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I don't know the exact cost but finding the parts would be the big thing. A gentleman from Canada just recently did one and has it documented on here.
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IBWD MIke
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Joined: 08 Apr 2012
Location: Newton Ia.
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Posted: 07 Jan 2018 at 7:02pm |
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I seem to remember that thread. Thanks for the reply.
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orangeman
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Joined: 12 Sep 2009
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Posted: 08 Jan 2018 at 10:28am |
IBWD Mike: I think if you do a search using Rustydollar that will bring you a wealth of information on the hydro rebuild that he tackled.
Lots of good information and much can be learned through the work that he did and was kind enough to post.
Orangeman
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IBWD MIke
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Joined: 08 Apr 2012
Location: Newton Ia.
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Posted: 08 Jan 2018 at 11:09am |
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Ok, next question. I have done business with the potential seller a couple of times already, great guy. I don't want to insult him on an offer but don't want to overpay for this thing either. What's a fair price for a good running (original Onan) Powermax with a bad hydro? Has great tires on the back fronts aren't much.
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Brian S(NY)
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Joined: 13 Sep 2009
Location: CherryValley,NY
Points: 3377
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Posted: 08 Jan 2018 at 1:41pm |
is it complete with front and rear pto? does it have the three point hitch? any attachments?
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God made man.Sam colt made man equal.
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 5072
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Posted: 08 Jan 2018 at 5:10pm |
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Before you assume hydro is bad I would at least verify oil level by unscrewing the stick to check. How fresh of a filter and oil? My 720 would barely move when I first ran it as it had been setting for awhile before I purchased it. New oil and filter resolved it. Those things are fairly bullet proof if proper care is given. Has it been professionally diagnosed?
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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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IBWD MIke
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Joined: 08 Apr 2012
Location: Newton Ia.
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Posted: 09 Jan 2018 at 10:06am |
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I will have to get back with the seller in the spring as he has went South for the winter. I'm pretty sure the oil level and filter are good. He is a good AC man. If it was something simple I think he would have caught it.
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injpumpEd
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Joined: 13 Sep 2009
Location: Walnut IL
Points: 4987
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Posted: 13 Jan 2018 at 9:47am |
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I had the hydro "go out" on my 720 about 10 years ago. I pulled it out and apart, and all that was wrong was the roll pin that connects the shift lever to the swash plate had sheared off from years of back and forth use. I was able to get all the seals, gaskets and needle bearings, and pins from a Simplicity dealer. The pump group looked really nice and clean still, though the charge pump was a little rough, and it was very expensive, so I just re-used mine. When using it hard, it does get slow to lift when really hot, but it still moves and raises the deck ok. The charge pump provides the hydraulics for the lift.I run Dexron in mine, just like called for in owner's manual.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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IBWD MIke
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Location: Newton Ia.
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Posted: 13 Jan 2018 at 11:41am |
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Thanks Ed, I hope I can get this thing bought. After getting my 720 last year and using the front blade I would like to have one tractor for that and one for the mower deck.
Edited by IBWD MIke - 13 Jan 2018 at 12:07pm
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rustydollar
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Location: Manitoba
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Posted: 13 Jan 2018 at 8:40pm |
Edited by rustydollar - 16 Jan 2018 at 3:10am
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IBWD MIke
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Posted: 14 Jan 2018 at 9:23am |
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Thanks, if I get this thing bought in the spring it will be interesting to see what's actually wrong with it.
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rustydollar
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Posted: 14 Jan 2018 at 11:09am |
Deleted by author
Edited by rustydollar - 16 Jan 2018 at 3:10am
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IBWD MIke
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Posted: 15 Jan 2018 at 11:02am |
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Good info, thanks.
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bill(soh)
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Joined: 13 Sep 2009
Location: waverly ohio
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Posted: 24 Jan 2018 at 9:57am |
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I have 620 mower that just stopped moving, figured hydro went out. To make a long story short finely figured out all splines on stub axel were worn clear off one side.
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D-15,CA,I-400,C,180 2-620's,2-110's,112,718,716,
5015, agco 1718
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