Jinma 284/Backhoe pressure test question

[TheSheriff]

This is really more of a backhoe/hydraulic question, but the BH is on a Jinma 284.

Where in the circuit would I plumb a pressure gauge to test the pressure relief setting on the BH? My set up uses tractor hydraulics, not a PTO pump.

I thought I could install the gauge between pressure line QD's between tractor and BH, but when I curl and hold my BH bucket, I get no reading.
Brad

 

[mrmikey]

That should be the spot, any chance you're on the return side of the circuit rather than the pressure side?
Not sure of your setup, ie power beyond, splitter or?/ bu be advised the gauge could show the lowest system pressure not the pressure setting of the actual loader valve......Mike

 

[erj]

Brad,
Which backhoe do you have?
RonJ

 

[TheSheriff]

Thanks Mike.

I thought it might be reversed and since my Gauge "T" fitting has QD's on both ends, it was simple to check the other line. Still no movement on the needle.

I'm using a Ranch Hand full flow kit, which sends pressure to the BH through the diverter valve.

 

[TheSheriff]

Ron,
I have an Ansung BH660

 

[mrmikey]

Not knowing your level of hydraulic experience Brad so forgive me if this sounds like an odd question.
You are dead heading a function to cause the pressure to go up, is the bh functioning at all and you just want to check the settings?.....Mike

 

[TheSheriff]

Mike, my knowledge of hydraulics is limited.

The BH is working. I'm just trying to confirm when the pressure relief valve kicks in.

I would suspect a faulty gauge, but it is new and was working fine when I removed it from the FEL circuit (I was checking the same thing on the FEL PRV).
Brad

 

[mrmikey]

I would suspect a faulty gauge

It sure sounds like it, if the bh is working and you're in the pressure circuit it'll have to read something.....Mike

 

[erj]

I also recently acquired the BH660. The input line is the one that enters the Control Valve on the side nearest the Boom control lever. If you tap into that line somewhere, you should be able to measure pressure of the hydraulic system.
RonJ

 

[Bob Rooks]

I also recently acquired the BH660. The input line is the one that enters the Control Valve on the side nearest the Boom control lever. If you tap into that line somewhere, you should be able to measure pressure of the hydraulic system.
RonJ

Ron J is correct, however, you won't get a reading unless you are actuating the valves. having a gauge in that location will not only tell you how much pressure is required to overcome the normal static state, and aside from telling you the relief valve pop pressure, will help in diagnosing cylinder problems.

 

[erj]

Bob,
Won't there be a slight indication on the gauge without activating a lever because of the open circuit nature of the system?
RonJ

 

[Bob Rooks]

Bob,
Won't there be a slight indication on the gauge without activating a lever because of the open circuit nature of the system?
RonJ

Actually yes, but just the laminar flow resistance of the valves and hoses and/or the resistance of a return line filter, wich will be just a few pounds with warm oil. Probably won't show up on a 3,000 lb. gauge, which I assume he is using. I hope. And all of the fittings are minimum schedule 80.

 

[TheSheriff]

Bob, I have a 5000 PSI gauge.

There is something I need to check, but couldn't get to it today. Thanks to all for the info.

 

[TheSheriff]

Ron,

So you are saying the pressure side goes to the left side of the valve block if you're sitting in the BH seat looking back?

 

[erj]

Ron,

So you are saying the pressure side goes to the left side of the valve block if you're sitting in the BH seat looking back?

Yes, you should be able to see this on the Hydraulic page of the exploded parts manual that you should have received with the backhoe.
RonJ

 

[TheSheriff]

Ron,

Thanks, that just confirms what I thought. Mine was hooked up the same.

Manual? That would be nice, but no, I didn't get one. Is yours available in a PDF? I would sure like to get a copy. I have been looking at the New Holland version on Ansung's site.

Ansung USA - Support - Parts Manuals - New Holland Parts Manuals.

That version is confusing because it shows the valve block orientation facing the operator as opposed to, which is how it's installed. To be more specific, the hoses are shown connected to the valve block facing towards the operator, when in fact, on my BH, the hoses connect on the back, away from the tractor. This leaves you guessing which is correct, and which side is truly left or right.

I checked things again tonight and the gauge worked using the same plumbing... no idea what the issue was... gauge stuck maybe?

Thanks all for the help. I am having an issue and when I get it resolved, I will give you all an update.