Hydraulic pressure check

[bobsphotos]

Morning,
After a piston pump rebuild I would like to check how much pressure it is putting out. Where in the system can I check it? My plan was to plump a gauge into the plug on the side of the pump but I am not sure that will show full pressure.
Thanks, and happy new year.
Bob W

 

[pmsmechanic]

Make sure you check it after the pressure relief valve. Just the voice of experience here.

 

[J_J]

Morning,
After a piston pump rebuild I would like to check how much pressure it is putting out. Where in the system can I check it? My plan was to plump a gauge into the plug on the side of the pump but I am not sure that will show full pressure.
Thanks, and happy new year.
Bob W

You plumb your gage in a tee in the IN port of the first valve, and it will show the pressure developed by the cyl or motor.

If you know the rating of the hyd pump, you can do or have done, a flow and pressure test where they use a pressure gage, a flow meter and a needle valve.

You need to know pumps max pressure so you can set the relief valve slightly below that pressure.

 

[J_J]

Make sure you check it after the pressure relief valve. Just the voice of experience here.

You check the pressure before the relief valve. The relief valve is what sets the relief pressure.

You can check pressure for any valve by using any of the QD on the machine using a plug in gage and using the levers briefly.

 

[pmsmechanic]

What happened and I was really green I just installed a pressure gauge to the outlet port if the hydraulic pump. After all that should tell me the pressure that it develops right? We ended up going and getting a new pump.

 

[bobsphotos]

Hi guys,
I should have mentioned that this is on a 1959 Ford 641. There are no QD's. This tractor only has a 3 pt hitch and no external hyd plumbing.
Bob W

 

[pmsmechanic]

Do you have an I&T or some other type of service manual for the tractor? They usually show where to check pressure. Maybe someone who has one can let you know.

 

[bobsphotos]

I have 2 different manuals but did not think to check them. Thanks for the idea.
Bob W

 

[bobsphotos]

Thanks pmsmechanic for the idea. One of my manuals talks about where to check it.
Bob

 

[Soundguy]

Hi guys,
I should have mentioned that this is on a 1959 Ford 641. There are no QD's. This tractor only has a 3 pt hitch and no external hyd plumbing.
Bob W

I was waiting till you finally told us what tractor this was.

As for no hyd plumbing, sure it does.

2 options that are easy.

Have a 3000 psi gauge, and either put it into the port on the pump body with a plug, or , my favorite, in the plugged port on the 3x5 cover under the right front of the seat.

Then chain the upper lift arm, either side, thru the knuckle, and to the axle.

Next exercise the 3pt lift and observe the gauge. You should see hyd cracking pressure, make sure rpm is at least at mid throttle. Engine will bog when forcingnhyds past relief.

 

[J_J]

Use a tee at the pump OUT port and a 3000 psi hyd gage.

The gage will show any hyd pressure and can be used for setting relief valves and trouble shooting.

1959 Ford 641

Hydraulics:
Capacity: 2 gal [7.6 L]
Total flow: 4 gpm [15.1 lpm]

 

[Soundguy]

Please lookup the application before giving advice.

Out and in 'ports' on a 00/01/000 4 cyl machine, as well as the naa, are hard connected via a plumping manifold and flange connection. The user has absolutely NO access to the ports!

A valve can be left in under the seat or on the pump to observe working pressures and relief, if the lift is loaded or stalled.

AND, the relief is not user set able, is tamper sealed shut, and is it installed an inaccessible above a cover on the underside of the tractor at the center section near the oil plumbing lines.

Other than replacement, the relief is not a user serviceable part for all intents and purposes.

 

[Soundguy]

https://www.google.com/search?q=for...RD%2BNAA%2BJUBILEE%2BHYDRAULIC%2BPUMP;225;169


Pump

Then manifold

 

[Soundguy]

ford 600 hydraulic manifold - Google Search






The manifold

 

[MitchellB]

Recently on my 861D I was able to install an Ebay hydraulic pump gauge (goes to 5000 lbs) elbowed from the plug in the top of my Hydraulic pump and left it there permanently. I haven't tried to test the relief valve by chaining the lift arms to the axle, but when lifting my 6' scrape blade the pressure ran up to about 400-500 lbs and dropped down to almost 0 when the lift stopped moving. I figure that is about the weight of the blade. When I do run into something heavy or unmovable, I plan to just keep an eye on the gauge from the tractor seat and observe how much pressure it really will lift and when the relief valve kicks in. I'm not sure what pressure the relief valve opens, but I know it is supposed to be under 3000 lbs. for mine tractor.

 

[Soundguy]

Most at pressures for tractors are under 2500 psi, which is why I reccomended a 3000 psi gauge to show good resolution.

With no book in front of me I'd guess open is around 2250 and cracking a bit less.

 

[bobsphotos]

Thanks for all the advice. I will try to get it checked this weekend.
Bob W