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440 Hydraulic System
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Midwest Farmer 7153 View Drop Down
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Joined: 16 Apr 2024
Location: Ohio
Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Midwest Farmer 7153 Quote  Post ReplyReply Direct Link To This Post Topic: 440 Hydraulic System
    Posted: 16 Apr 2024 at 7:13pm
New to the forum.  Just bought a 1975 440.  I plan to restore the unit and use it on the farm.  The hydraulic fluid has water in it, most likely due to the tank cap being damaged and allowing water in.  Can anybody walk me though flushing the hydraulic system? Also, can I use universal sae 10-30 hydraulic fluid in the system?  The owner's manual calls for straight 10.  Thank you in advance.
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ac fleet View Drop Down
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Joined: 12 Jan 2014
Location: Arrowsmith, ILL
Points: 2320 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac fleet Quote  Post ReplyReply Direct Link To This Post Posted: 16 Apr 2024 at 10:17pm
Dont know what my two 440's have in them. I never had to add or change it. Mine are # 1576 and # 1577 ---- what is your #?  I could have had 1578 but didnt have the money to get it.
http://machinebuildersnetwork.com/
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Midwest Farmer 7153 View Drop Down
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Joined: 16 Apr 2024
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Midwest Farmer 7153 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2024 at 5:46am
#1694
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Ray54 View Drop Down
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Joined: 22 Nov 2009
Location: Paso Robles, Ca
Points: 4552 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Ray54 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2024 at 1:04pm
Welcome 
Since nobody seems to know I will stick my neck out to be chopped off when I am wrong. As I have never been on a 440. With the book saying 10# oil, I would guess the hydraulic system is not part of any other thing like the transmission, as most tractors are. So at least as a flushing fluid use cheap yellow bucket oil.

I have farmed with old crawler tractors for 50 years. All add on hydraulic systems so I have been using the cheapest possible yellow bucket oil. I did have a failure with it 2 years ago. It had a wax like substance completely choke off the screen on my suction side of pump. It had been sitting for several months. Upon use after a hour I had less and less hydraulic pressure to lift remote equipment, so I stopped. Once clean everything worked, with more yellow bucket that was on hand.  But have not bought any more since then. 
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8247 		Post Options Post Options   Thanks (1) Thanks(1)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2024 at 2:16pm
They just use an Eaton truck trans so i'm sure the hyd system is an add on of some kind. Any good hyd oil should work. Just an opinion.....
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ac fleet View Drop Down
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Joined: 12 Jan 2014
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Points: 2320 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac fleet Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2024 at 8:28pm
Hyd system is by itself!! NOT part of the trans.!  
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