Hyd. Pressure

[J_J]

JJ,
I can curl the load when I am unable to lift it vertically. It seems that a combination of the two functions (curl then lift) will get the bale in the air.
Where should I begin to troubleshoot if it is bypassing.
Thank you all for the great advice.

You can do this because you have shifted the load closer to the lift pins. Also, some hyd machines will have a better force rating on the curl function.

Install the gage, and tell us the max pressure that you see by fully extending the cyl.

Look in your manual or call the dealer and determine the pump pressure.

Compare the pump pressure to what you read on the gage.

Did you ever take the relief valve out and inspect or clean it?

 

[mwb]

The hyd test gage goes on the input side of the valve. Just tee in to the IN port and leave the gage in place, and then any hyd operation will be reflected on the gage.

To adjust, remove the cap on the relief valve. and there should be a bolt/screw to turn down, or shims/washers have to be installed. Easy to do. If you need shims, ask your dealer what size shim will produce the effect you want.

Install gage, start engine, and read hyd pressure by fully extending the cyl. If screw type, adjust for correct pressure.

Turn off engine, to install shims as necessary.

Start engine, and fully extend and read the pressure.

J_J, why wouldn't you install the gauge one of the OUT ports. I realize that the pressure will be close but to me measuring the pressure after the pressure relief would offer the most accurate result. I would think the pressure at the IN port would appear higher than the OUT because of fluid dynamics, etc. Not starting an argument but you did correct me and recommend to put the gauge somewhere else. I would definitely put the gauge on the OUT port of the lift circuit. That is the only way to isolate if there is a problem with the spool valve and/or the relief.

 

[J_J]

The pressure relief doesn't come into play until you provide the resistance such as a fully extended cyl, or a heavy load, etc.

There is really no need to install the pressure gage other than the input to the valve. Whenever you activate any valve, the pressure will be reflected at the gage. All the fluid flows by the gage, and any pressure will be reflected on the gage.

If you only activate the 3pt, and lift a load, the pressure is reflected. If you raise the bucket with a full load, the pressure required will be on the gage. I would say that the FEL valve leaks less than any other part in the hyd system.

You can plug the gage into any part of the system and read the pressure.

You would be surprised at the pressure required to accomplish some task.

To raise an empty bucket, about 200 to500 maybe less.

The relief is there primary to protect the pump.

A QD on the gage can plug into all the QD's you have on the machine.

If you are using PB, then the pressure on the tank port will be the expended fluid from the cyl, and will be very low If you tee into the PB outlet, you will be reading pressure caused by a valve downstream activating.

 

[mwb]

You are recommending is to installing a permanent gauge on the system? For the purposes of diagnostics it would be far easier and faster to simply click the gauge onto on the of loader quick-connects, do the test, adjust if necessary and remove. What you are recommending is to modify the plumbing to install a test port which is not that difficult but does require parts and more time.

I don't think the QD's are the same between the rear remotes and the loader - mine certainly are not.

 

[J_J]

Then it would be more practical to install a tee and gage at the IN port, for monitoring and trouble shooting. Hyd 3000 psi gage, hyd tee, and adapter from gage to tee. You could also install test points anywhere on the tractor.

 

[pontiacman]

I was able to get a pressure reading off of the rear remotes, and it was approx. 2250 PSI, which is right at what is speced. I need to round up additional fittings to get a reading from the lines to the loader. Thanks for all your help, and I will let you know what I find.

 

[pontiacman]

Got a reading off of the quick connects for the loader, and they are also right where they should be (2250 psi). I guess my expectation may have been set alittle high on the loader capacity. Thanks again guys for all your help.:thumbsup:

 

[J_J]

mwb, said your tractor should lift 2500 lbs, and you say that it can barely lift a bale weighing about 1500 lbs. Something is not right.

Does this look about right?

Montana 5740C S#:2174C4AF0295 4-cyl diesel engine, 57hp, 148hrs. Synchro Shuttle 16x16 transmission 4x4, R4 tires, tilt steering wheel CAB: A/C & heat, radio, 12V power port Dual rear remotes, Cat.1 3pt with QA loader, joystick control 70" SS Bkt, Lift Capacity = 2,385lbs.

 

[pontiacman]

JJ,
What you have listed is the same make and model and specs and I have. What is the next item you would check.
Scott

 

[J_J]

Maybe those bales weigh more that 1500 lbs. Are they dry bales? Did you ever state if the relief was relieving. I believe I would put a test load in the bucket and check exactly what you can lift.

 

[pontiacman]

I have a 55 gallon drum that I converted into a counterweight (filled with concrete) that should be approx 1100 lbs with all the metal in it. I can get that without a problem, but I am unable to lift a pallet of wood pellets (2400#'s). I need to get a couple of items with know weights from 1500 to 2000 lbs and see where I am maxing out at.

 

[J_J]

pontiacman,

When you try to pick up a pallet of wood pellets, how far away is the back edge of the pallet, from the pin line. Are you lifting the pallet with forks only, or bucket mounted forks?

 

[pontiacman]

I am using pallet forks (SS style quick attach), so the pins are as close to the load as is physically possible.

 

[mwb]

Where did you measure the pressure? I realize that pressure is pressure but if you have a restriction after the valve (in the qc's for example) that might cause some problems. This might be reaching but something has too be wrong - or as J_J stated - you are expecting too much from it.

Do you have a gravel or sand pile? you might be able to create a known test load from that based on volume.

 

[J_J]

Where did you measure the pressure? I realize that pressure is pressure but if you have a restriction after the valve (in the qc's for example) that might cause some problems. This might be reaching but something has too be wrong - or as J_J stated - you are expecting too much from it.

Do you have a gravel or sand pile? you might be able to create a known test load from that based on volume.

It is not what he expect, is the loss of ability to lift the limit stated by Montana. His machine has a lift Capacity = 2,385lbs at the set relief pressure. .

 

[pontiacman]

I measured the pressure at the quick connects for the loader(under the cab).
I do have a couple of dirt piles, but I will not be able to get into them until spring. During past dirt moving, the loader will handle a heaping load of dirt, but I can get into a pile where I am unable to lift or curl. With a heaping pile of dirt, the back end is very light without some ballast.

 

[SPYDERLK]

Your 2500 lift is probably rated at the pins. Id think your forks weigh 3-400lbs and their center of mass is at least a foot from the pins. Then add the 1500lbs with CM about 3 or more feet from the pins and the accumulated 1800+ lbs is just over the limit. Im not surprised. ... I would raise the relief pressure to 2500. Most tractors are set around that.
larry