Low Hydraulic Pressure

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Low Hydraulic Pressure

Postby Turner85 » Thu Dec 13, 2018 3:04 am

I only have about 7-800lbs on my remotes and I can’t pick up my grader blade with the 3 point hitch. Installed a used hydraulic pump and the pressure remained the same. I have searched the forum and read past posts. The O-rings on the tube between the pump and cover were good. I shimmed the unloading valve and the pressure is still low. I appear to have the early style valve; I am unable to find a part number for the original or any replacement. Any other ideas?
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Re: Low Hydraulic Pressure

Postby mathias1 » Thu Dec 13, 2018 10:53 pm

Did you check the pressure on the tipping pipe?
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Re: Low Hydraulic Pressure

Postby Emiel » Fri Dec 14, 2018 11:26 am

Hi,

What oil do you use and did you check on the intake filter?

I'm not quite sure on the design of the control valve, which one is fitted? Single lever, dual lever or do you have the super major cover?
Can you place some pictures?

rgds

Emiel
Best regards

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Re: Low Hydraulic Pressure

Postby Turner85 » Mon Dec 17, 2018 4:58 am

SAE 30. I did clean the filter in the bottom of the differential when I changed the old oil. I have one set of remote hydraulics. I bought a complete unit from a junkyard. I will try and get some pics next time I'm at the farm.
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Re: Low Hydraulic Pressure

Postby Turner85 » Thu Jan 10, 2019 2:38 am

Sorry for the delay, work has kept me away from the shop. As far as the valve I have style A:
Image
Image

Here is the top of the differential before I added the aux valve
Image
And the finished product before I installed it on the tractor.
Image
The gauge, reads about 700psi with lever depressed
Image

I replaced the spring tonight, added more shims and the pressure stayed the same. I'm about to pull out my hair. Any help would be appreciated
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Re: Low Hydraulic Pressure

Postby henk » Thu Jan 10, 2019 8:02 pm

Have you checked the inside of the pump?
Two time I had lost of pressure doe to a broken O-ring thats around the butterfly inside the pump. Broke two times because of play on the gear wheels. Simmed the gear wheels and had no trouble so far.

Image

Image
Kind regards, Henk

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Re: Low Hydraulic Pressure

Postby Turner85 » Fri Jan 11, 2019 12:19 am

I havn't looked in either pump, since the pressure stayed the same after I switched them I dismissed that but I'll tear it apart first chance I get
Thanks.
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Re: Low Hydraulic Pressure

Postby Emiel » Sat Jan 12, 2019 9:16 am

Hi Turner,

If pressure remains the same when shimming the valve, the pump does not supply more pressure it seems. Open up the pump, and you'll likely find something similar to what Henk found.

Rgds Emiel
Best regards

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Re: Low Hydraulic Pressure

Postby Turner85 » Sat Jan 12, 2019 9:15 pm

I disassembled the original pump I removed earlier. I could find nothing wrong with it.
Image
Image
Image

Also the diagram on New Holland's part website shows a different pump, looks like a super major pump. Does anyone have a diagram for a Major pump?
Image

I have two friends who are tractor mechanics by trade, unfortunately no one around here knows anything about British Fords. :( I got some funny looks last time I went to the local dealership
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Re: Low Hydraulic Pressure

Postby oehrick » Sun Jan 13, 2019 1:11 am

Have you checked the sides of the two gears and the equivalent rubbing surfaces either end of the housing ? if there are two circular wearmarks each side of where the gears rotate this might be a release/ escape path for the oil under pressure. any detectable gap here is not good news.

A decent hydraulic pump repairer out to be able to rig this up to test pressure and flow characteristics

Meanwhile, if you do not have them already, you can download free copies of the E1A Parts book which covers the main variants and the repair manual in 6 sections from here

http://www.smallholderservices.co.uk/id25.html whuch might assit you

Good luck
Best regards
Rick - Bogside on Bure


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Re: Low Hydraulic Pressure

Postby Turner85 » Sun Jan 13, 2019 2:44 am

You can see where the gears run, I can feel it with my fingernail. Its not exactly rough but there is a difference
Thanks
Image
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Re: Low Hydraulic Pressure

Postby henk » Sun Jan 13, 2019 7:32 pm

O-ring at the butterfly seems ok. I advise to put all new o-rings in the pump at assembly.
Kind regards, Henk

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Re: Low Hydraulic Pressure

Postby Turner85 » Mon Jan 14, 2019 5:12 am

Decided to disassemble everything, thought maybe I'd see something I had missed before, when I pulled of the hydraulic valve I found some of the gasket maker had covered this hole.
Image
I doubt that it is the cause of my problem but it did stand out.

Also what is this?
Image


https://dextamatt.imgur.com/all
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Re: Low Hydraulic Pressure

Postby Emiel » Sun Jan 20, 2019 1:18 pm

Hi,

I'm affraid I can't help you in detail here. Never worked on those valves. To the what's this question, can't identify the part exactly. Give a little more info's.

Otherwise, just clean everything thoroughle. Use liquid gasket very little and assemble very neat. then you should see improvement, or have overlooked something I can't find in the photos.
Best regards

Emiel

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Re: Low Hydraulic Pressure

Postby oehrick » Mon Jan 21, 2019 12:08 am

It is possible to fit a second valve for say a loader or hedge slasher drive, this may be a port for such a valve so blanked if only one valve fitted ?
Best regards
Rick - Bogside on Bure


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Re: Low Hydraulic Pressure

Postby Old Hywel » Mon Jan 21, 2019 11:19 am

If the pressure remained the same after fitting a different pump, then the problem must lie elsewhere.
Can you fit a pressure gauge into the linkage lift tapping? If that showed better pressure, it should narrow your search.
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