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720 Hydro oil

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AC720Man View Drop Down
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    Posted: 14 Sep 2020 at 8:14pm
Been a few years since I changed my hydro oil(less than a 100 hrs ago). So I decided to change the oil and filter since this one sets outside under cover. Drained the fluid over night, picked up 6 quarts and filter. After 5 quarts I checked the level and it was way above the full mark. I started it, ran it around a little bit, let it set for 15 minutes and rechecked the level again. It is still above the mark. What am I missing here? Hood clearly says 6 quarts. No way the lines to the front and oil cooler could have more than a quart in them? Wouldn’t that have drained out?
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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Brad in WA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brad in WA Quote  Post ReplyReply Direct Link To This Post Posted: 15 Sep 2020 at 4:29am
Did you take both plugs out when you drained it? I think the temp sensor has to be removed to get all the oil out.
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AC720Man View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC720Man Quote  Post ReplyReply Direct Link To This Post Posted: 15 Sep 2020 at 10:15am
I removed the the temp sensor to drain as it is the lowest point. Guess I need to pull my book out.
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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Steve in NJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2020 at 8:20am
Rob, I think both plugs need to be out to drain the tranny completely.  Don't remember myself now. Sheesh! A mind is a terrible thing to waste...  LOL!
Steve@B&B
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Bird76Mojo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bird76Mojo Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2020 at 1:57am
I took out the sending unit today, let it drain for quite a while, then removed the suction tube and a BUNCH more fluid came out. I'd say removing both is the best route to take..

I guarantee that there's a quart in the hydro lines, cooler, pump, front circuit, rear circuit, etc..
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AC720Man View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC720Man Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2020 at 7:39pm
Thanks Mojo, I do now remember doing that the last time. There is a procedure in the book describing how to bleed the system afterwards. I think I stuck a female fitting upfront and shot it in a 5 gallon bucket. It will make a mess even though it does take much to clear the air. A lot of pressure there.
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bird76Mojo Quote  Post ReplyReply Direct Link To This Post Posted: 28 Sep 2020 at 7:25pm
It should flow around 2.5 gallons per minute at 500psi.


Not enough flow to run a hydraulic chainsaw unfortunately..
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