Pressure releif valve - front loader - Iseki 1240

[Marcle]

Hi guy's,

I'm the new owner of an Iseki 2140, so trying to workout where everything is.

I'm looking for the locations of the pressure relief valves on the hydraulics for my front loader. I've found the PRV on the control spool valve, however there must be another on the tractor somewhere, can anyone advise please?

Thanks in advance of any help.

 

[J_J]

Hi guy's,

I'm the new owner of an Iseki 2140, so trying to workout where everything is.

I'm looking for the locations of the pressure relief valves on the hydraulics for my front loader. I've found the PRV on the control spool valve, however there must be another on the tractor somewhere, can anyone advise please?

Thanks in advance of any help.

There should be a relief valve for the 3pt and one for the FEL valve.

On the FEL valve, it is usually close to the IN port.

 

[Marcle]

There should be a relief valve for the 3pt and one for the FEL valve.

On the FEL valve, it is usually close to the IN port.

Hi,

If you mean the one on the up/down levers (spool valve), I've already found that one, but there must be another somewhere on the tractor it self, or have I miss-understood you?

 

[J_J]

Hi,

If you mean the one on the up/down levers (spool valve), I've already found that one, but there must be another somewhere on the tractor it self, or have I miss-understood you?

If you have a FEL or loader, that valve will have a relief valve.

The 3pt always has a relief valve.

If you have a remote valve, it will have a relief valve.

 

[Marcle]

Here's a photo of the one on the frame of the front loader

 

[J_J]

Here's a photo of the one on the frame of the front loader
View attachment 269336

There should be another relief valve in the 3pt area. You should obtain a parts manual for your tractor.

Hold your 3pt handle up to raise and you should hear it scream, and it will be relieving fluid to the tank, and if you install a hyd gage in the hyd system, you can see and perhaps set the relief pressure.

 

[Marcle]

I have previously put out a request for manuals.

There is no sounds of any prv's blowing off when the 3 point linkage is raise to max, nor change in engine tone.

 

[J_J]

I have previously put out a request for manuals.

There is no sounds of any prv's blowing off when the 3 point linkage is raise to max, nor change in engine tone.

All reliefs don't make sound, but most do.

Install a hyd 3000 psi gage in a tee at the IN port of the FEL valve and you can see the pressure of any hyd component using the hyd.

 

[Marcle]

Well.... finally got a pressure gauge set up, and the result was disappointing, but plenty of room for improving as the max pressure was a touch over 1500psi. I've not done any further investigation yet, but hoping the PRV is the problem as the tractor has only done 208 hours.

 

[J_J]

If you have a manual, what pressure is the relief setting.

This chart may tell you what year you have.

http://www.tractordatainfo.com/Massey-Ferguson-farm-tractors/Massey Ferguson-1240-farm-tractor.html

If the FEL cyl's or the FEL valve is bypassing, you may not see any pressure higher than that.

 

[JerryG]

There should be a hydraulic manifold under the platform on the side of transmission housing. The PRV will be behind that manifold. This is the system relief valve. This will be right if it is like the mid size MFs that are built by Iseki.

 

[Marcle]

In the workshop manual I have, there's loads of torque settings for everything, but absolutely nothing on pressures!

 

[J_J]

I am not saying your are wrong, but most workshop manuals would have all the instructions for trouble shooting and setting the relief pressure.

Where did you put the gage to test pressure.

If you put it in a tee in the IN port of the FEL valve, it will show the pressure for any hyd component in the system.

What was the pressure with the FEL valve with the lever in the full up position?

What was the pressure with the 3pt in the full up position?

If you had your own flow meter and gage, you could test the pump flow and pressure.

You still have to know your pumps max pressure, and set any relief about 50 to 100 psi below that.

 

[Marcle]

I am not saying your are wrong, but most workshop manuals would have all the instructions for trouble shooting and setting the relief pressure.

Where did you put the gage to test pressure.

If you put it in a tee in the IN port of the FEL valve, it will show the pressure for any hyd component in the system.

What was the pressure with the FEL valve with the lever in the full up position?

What was the pressure with the 3pt in the full up position?

If you had your own flow meter and gage, you could test the pump flow and pressure.

You still have to know your pumps max pressure, and set any relief about 50 to 100 psi below that.

I hear what your saying about the manual, however I've been right through it and nothing. The trouble shooting page (not pages) is very basic.

The easiest place to put the gauge was the feed line to the fel up/lift line. The loader was under a heavy truck, so not at the end of stroke and the fel spool valve prv has been wound right down.

Moving the 3pt hyd lever to various positions made no difference. With regards to the other points, I'd need more written info to move forward.

A good point is that I've got a specialist comming this evening to have a look, but he admits he's more used to much larger machinery.

 

[Marcle]

There should be a hydraulic manifold under the platform on the side of transmission housing. The PRV will be behind that manifold. This is the system relief valve. This will be right if it is like the mid size MFs that are built by Iseki.

Below is a photo I took some time a go. I've taken 'D' out which is a prv, however now that I've got a manual (very basic on hydraulic info) it appears this may be a safety valve at the end of the hydraulic cylinder for the 3 pt linkage. 'A' controls the rate at which the 3 pt linkage raises and lowers.

'B' and 'C' are the flow and return pipe to the fel. Theses are plumbed to a manifold block. Are you saying there may be prv's under this block cover?

The unmarked arrow is to a shut off valve that feeds a quick release coupling on the wing.

 

[J_J]

Does your manual have a specifications page?

From the pictures, you have found both relief valves.

Can you provide flow path for your hyd?

The first relief valve in line will be the master relief, and the other relief can be set the same or lower.

Did the 3pt indicate the same pressure as the FEL.

Where was the gage when you did the 3pt pressure test?

The loader should be at the end of stroke, because the load will dictate the pressure. If you are only lifting half the potential weight, then you will read less pressure. The cyl must be at the end of stroke for max psi testing.

 

[Marcle]

I've now established the 'specified' pressures as being...
Pressure:1800 psi [124.1 bar]
Total flow:2.7 GPM [10.2 LPM]

However I'd still like help in knowing where the prv's are located please?

 

[J_J]

The relief valve should be located close by the IN port of any valve.

On the 3pt, it could be under a hex head screw.

 

[Marcle]

Thanks JJ,

I'm going to have to do some stripping down to see what I can find. Seems strange there's not a clear exploded diagram of the section of the system.

 

[Marcle]

Well... I've stripped hydraulic manifold off the side of the gearbox as shown in the photo below



Well the block is just a manifold, nothing more. looking down the holes on the side of the gearbox, there are no screws, all you can see is a port drilled off to the side and the bottom of a drilled hole. I even removed the bolt holding the pressure line from the pump to see if there was any screw within the threaded hole. nothing...

In another vain attempt to find a hidden adjustment screw or what ever, I took the pressed steel seat bracket off the top of the gearbox, but nothing.


Well I'm stuck again....