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Hydrostatic

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john2189 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Topic: Hydrostatic
    Posted: 13 Dec 2018 at 10:40am
My simplicity sunstars hyd is very erratic when cold. steering,trans and lift. Whines a little bit. Don’t rember being that way in the past. Looks like it’s about an inch hi in the plastic line. .what could be wrong with it? Seems to be better when warmed up, but still not as good as it was. Does it have a belt that drives the hyd pump?
John

Edited by john2189 - 13 Dec 2018 at 10:49am
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Alvin M View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alvin M Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 2018 at 3:48pm
change filter and oil first if it don't help need to know model #
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Post Options Post Options   Thanks (0) Thanks(0)   Quote talntedmrgreen Quote  Post ReplyReply Direct Link To This Post Posted: 18 Dec 2018 at 6:53am
No, there are no belts in the driveline.  How does your powersteering feel?  The old sunstrands all have a whine to them, some more than others.  I agree, fluid and filter and give it another shot.  
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john2189 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2018 at 10:24pm
sorry, havnt had a chance to change the oil yet.  when its cold noting works right,or at all  steering, lift or trans until it warms up.  it does whine a little. 
 Is there an online manual for this?
 
John


Edited by john2189 - 19 Dec 2018 at 10:26pm
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john2189 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jan 2019 at 1:53pm
Is type F transmission fluid ok for the hydrostatic, or universal hydraulic oil?
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DaveKamp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 20 Feb 2019 at 6:58pm
If the hydrostatic level is high, that's because there's water in the bottom pushing it up.

Do you like hydrostatic drive?  if so, empty that stuff out immediately, and refill it with fresh new... it doesn't take much water through a hydrostatic pump to ruin it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ac720nut Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 2019 at 5:21am
T would assume you have moisture in the oil same thing happens on a snowplow. change oil and filter and it should be good to go, Just my $.02
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john2189 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2019 at 9:08pm
Thanks, been cold and not much time to work on it. supposed to get warmer soon will change oil then
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DaveKamp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2019 at 12:08am
When it's really cold, it's always better to leave water in the hydrostat system, particularly inside the pump, so when it freezes, it can expand in the passageways and close-fitment parts, and break castings and internal parts... Unhappy

Would be best if you could drag it into a heated shop, and drain it ASAP... I've replaced too many broken up hydrostats
Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john2189 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2019 at 3:29pm
OK changed the oil with type F trans fluid and filter.  No water. The oil was still reddish, not dirty and no burnt smell to it.  The filter was very, very loose.  Could it have sucking air?  Everything, hyd, steering and trans works like new, no hesitation at all.

John 
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