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john2189 
Silver Level
Joined: 11 Sep 2009
Location: Minerva,Ohio
Points: 304
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 Topic: Hydrostatic
Posted: 13 Dec 2018 at 10:40am |
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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
Orange Level
Joined: 24 Jun 2018
Location: PA
Points: 762
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Posted: 13 Dec 2018 at 3:48pm |
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change filter and oil first if it don't help need to know model #
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talntedmrgreen
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Joined: 25 Jun 2013
Location: Caledonia, MI
Points: 477
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Posted: 18 Dec 2018 at 6:53am |
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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
Silver Level
Joined: 11 Sep 2009
Location: Minerva,Ohio
Points: 304
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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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'41 Allis B
'45 Allis B
'49 Farmall Cub
'72 IH Cub
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john2189
Silver Level
Joined: 11 Sep 2009
Location: Minerva,Ohio
Points: 304
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Posted: 21 Jan 2019 at 1:53pm |
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Is type F transmission fluid ok for the hydrostatic, or universal hydraulic oil?
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'41 Allis B
'45 Allis B
'49 Farmall Cub
'72 IH Cub
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DaveKamp
Orange Level Access
Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5745
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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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ac720nut
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Joined: 09 Feb 2016
Location: Dexter Mi
Points: 1217
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Posted: 21 Feb 2019 at 5:21am |
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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
Silver Level
Joined: 11 Sep 2009
Location: Minerva,Ohio
Points: 304
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Posted: 25 Feb 2019 at 9:08pm |
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Thanks, been cold and not much time to work on it. supposed to get warmer soon will change oil then
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'41 Allis B
'45 Allis B
'49 Farmall Cub
'72 IH Cub
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DaveKamp
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Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5745
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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... 
Would be best if you could drag it into a heated shop, and drain it ASAP... I've replaced too many broken up hydrostats
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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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john2189
Silver Level
Joined: 11 Sep 2009
Location: Minerva,Ohio
Points: 304
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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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'41 Allis B
'45 Allis B
'49 Farmall Cub
'72 IH Cub
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