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gary singleton
02-20-2021 07:58:40
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put new o rings on top piston lift works good with engine sped up, will leak down when i trottle down speed up it will lift, what is the problem?
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JMOR
02-21-2021 09:22:23
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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In the interest of accuracy, I want to retract this part of my previous post, "A leak down when pump not running is not going to be the overpressure relief valve, but rather the check valve, ...". A leak in either will let it leak down when not running.
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JMOR
02-21-2021 08:56:51
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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Quoting Removed, click Modern View to seeThanks, I try.
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Btzj02
02-21-2021 07:54:21
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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Great info. A picture is worth a .........
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Caryc
02-21-2021 07:50:03
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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Quoting Removed, click Modern View to see
I can't figure why you had to drop the pump to replace the relief valve. I removed mine with a regular box end wrench. Of course I had the top cover off but also the round dipstick side plate. I reached in through that side plate hole with the wrench just fine.
The check valve did not come out with it. I reached down there with a pair of tweezers and pulled it out.
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JMOR
02-20-2021 14:13:56
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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A leak down when pump not running is not going to be the overpressure relief valve, but rather the check valve, if it is in fact a problem with the combination check/overpressure valve assembly. People always say overpressure, not always realizing that the unit referred to as overpressure valve actually contains both an overpressure and a check valve.
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JMOR
02-20-2021 14:00:20
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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Quoting Removed, click Modern View to seeyou still have a leak somewhere. Here are nine possible leak points.
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Gary Singleton
02-20-2021 13:48:57
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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[is that the one thats on the rear bottom i replaced the one there had to drop pump to get to it???thanks for your help, guy in another post ask why i replaced o rings it quit lifting period thats why
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Den N Ms
02-20-2021 09:21:30
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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Gart,Check for a stuck open or leaking pressure relief valve.
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John Deere D
02-20-2021 08:02:46
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Re: 8n ford hydraulic lift in reply to gary singleton, 02-20-2021 07:58:40
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What was the Hydraulics doing / how were they operating to cause you to do the work on the hydraulic lift ???? Bob
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Gary singleton
02-20-2021 16:34:11
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Re: 8n ford hydraulic lift in reply to John Deere D, 02-20-2021 08:02:46
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The lift just wouldn't do anything would not lift
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Gary singleton
02-20-2021 16:35:39
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Re: 8n ford hydraulic lift in reply to Gary singleton, 02-20-2021 16:34:11
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