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Hydraulic Pump Help Please - Allis 7000
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Play Farmer View Drop Down
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Joined: 13 Jan 2016
Location: NNY
Points: 732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Play Farmer Quote  Post ReplyReply Direct Link To This Post Topic: Hydraulic Pump Help Please - Allis 7000
    Posted: 17 Jun 2019 at 7:14am
Good morning. 

I need some help and/or your opinions. Take a look at the attached picture. This is on my 7000 Maroon belly. It started leaking hydraulic fluid so I took the pump off and found what you see in the picture. The o-ring was also a little brittle so I assumed this was the smoking gun. I replaced the o-ring, put it back together and went back to work. 

I mowed some hay yesterday afternoon, it worked well for about 2 hours - now it's leaking again. I haven't taken it off yet but it's leaking from the same spot so I expect to find the same issue. I'm using a nitrile o-ring in a petro-based hydraulic fluid so I don't think chemical attacked is the issue. 

Other than the leak it's working awesome. Any ideas on why the failure so soon after the repair? Bad luck, coincidence, cap loosened up, or an internal issue over pressurizing the pump? Any comments, suggestions, ideas? 

Thank you in advance.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20994 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jun 2019 at 7:27am
First failure old age and a loosened up plug. Second failure is from a cheap o-ring.
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Joe(TX) View Drop Down
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Joined: 11 Sep 2009
Location: Weatherford. TX
Points: 1682 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe(TX) Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jun 2019 at 4:10pm
Did you use a standard o ring or one made for a hydraulic fitting? They ar not the same.
1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A
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Joined: 13 Jan 2016
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Points: 732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Play Farmer Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jun 2019 at 9:14am
Following up on this one - you guys were, as usual, 100% spot on. 

I picked up the proper "boss O-Ring" at our local hydraulic shop and put it back together. I worked it all day yesterday without an issue. I'll call this one fixed. 

Thanks for the help. 

On a side note, a buddy of mine is a hydraulics engineer by trade, he gave a more in-depth description/answer too;

The very first thing that came to mind when I looked at the picture was, are you using the correct size o-ring in there? Those fittings require BOSS O-RINGS (See the attached chart and illustration). Standard industrial O-rings (i.e. -100, -200 etc. series’) won’t work well on those fittings. They must be BOSS O-RINGS. BOSS O-RINGS are typically made from 90 durometer Nitrile and therefore more resistant to extrusion, whereas standard everyday industrial Nitrile O-Rings are typically made from 70 durometer material.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20994 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jun 2019 at 9:22am
Like comparing a grade 5 bolt to a grade 8 bolt. They look alike but they ain't the same...……….
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Joined: 13 Jan 2016
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Points: 732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Play Farmer Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jun 2019 at 9:52am
Yup! 

When the original came out it was hard and somewhat brittle. In my real job a harder o-ring is a bad deal. I knew brittle was bad, the harder part was something I'm not used to seeing. 

I'm chalking this one up to "I'm never too old to learn" and "I won't make that mistake again"!  
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
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Points: 8369 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jun 2019 at 12:55pm
Boss eh? That's interesting. I recently replaced some o-rings on the pump head of a cheap 7hp pressure washer. Got em at the local welding,hydraulic cyl repair, you name it they fix it shop. He gave me "boss" orings as they were what seemed to fit best. Good choice and maybe by chance. Anyway,doing the job and lesser  may have failed. I wrote the part number on the washer.

Edited by SteveM C/IL - 24 Jun 2019 at 12:56pm
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