Egon
Epic Contributor
Look at you cylinders. Does the ram still have room for movement
New vs Old
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Slowpoke Slim
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- Husqvarna YTH24V48 riding mower, Branson 3725CH
Can you go up to something solid, like a hay bale, set the loader bucket on top of that, and then try to lift the front of the tractor? It would show you if it's a travel limit issue, or a hyd pressure/control issue.
So I finally got around to checking my loader with a round bale. No luck lifting the tractor even while pushing down on the top of a round bale. I know I am not pushing the stick to float and I can feel a little vibration in the stick when it contacts the bale or ground. Is that a relief valve opening?
Xfaxman
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The best way to see if the relief valve is opening is to put a pressure gauge, were you can see it from the seat, in the line from from the pump.
Use the Google Custom Search box at the top of the page, there are several threads about it here on TBN.
I put a gauge in the alternate pressure in port on the loader valve:
The pressure in ports are on the right side:
Valve mounted, with pressure hose and return to reservoir hose:
It is next to the seat on the left side, just look down to see the pressure reading :thumbsup:
Use the Google Custom Search box at the top of the page, there are several threads about it here on TBN.
I put a gauge in the alternate pressure in port on the loader valve:
The pressure in ports are on the right side:
Valve mounted, with pressure hose and return to reservoir hose:
It is next to the seat on the left side, just look down to see the pressure reading :thumbsup:
Last edited:
Fallon
Super Member
Under hydraulic specs. Sometimes it's in the loader manual for some reason. It may just be listed as max hydraulic pressure or operating pressure.
Texasmark
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0-5000 psi, glycerine filled are available online, ebay for one, for a pence. Relief valves are in the range of 2500-3000#, usually 500+# above the output limit of your hyd pump. How much does your tractor and loader weigh? I'd figure about half for your lifting requirement or more figuring the loader. Half the loader weight is already on the ground so you can subtract that.
Curl and dump functions come off one cylinder and it has no float (usually). Lift comes off a separate cylinder and it has float.
Why not just swap hydraulic connections.....if like mine, QDs are at the joystick, or may be close at hand. That way you can run your lift function off the hydraulic circuit that you used for curl and dump and got satisfactory results. If things work when swapped, then look at the side that failed. Spring could have gotten weak on relief valve attached to control, or cylinder (inside the control) is leaking on that side. If you swap and it still doesn't work, time to renew the packing (seals) in your lift cylinders would be my first guess.
On ability to lift your machine, your hydraulic system should put out about 2500 PSIG at PTO rpms, a lot less at low rpms. If you had one square inch of piston area you would have 2500# of lift capacity at the cylinders on the loader. With usually 2 cylinders and 2" or so diameters, you have a lot more force available than that.......Force = PSIG x area of piston....(diamerer/2 squared x 3.14). There is an efficiency number associated with that which reduces the effective/usable force at the lift point, depending on the condition of, and design of your FEL.
Also is the foot-lbs part of the equation.....how far is your load from your lift point...pivots on FEL arms? Spec sheets on new loaders usually specify if rating is at lift arm pivot or usually 24" distant which doubles the lifting requirement for a given weight of load......and they go farther to specify if at full lifting height (because of FEL efficiency at different angles).
Curl and dump functions come off one cylinder and it has no float (usually). Lift comes off a separate cylinder and it has float.
Why not just swap hydraulic connections.....if like mine, QDs are at the joystick, or may be close at hand. That way you can run your lift function off the hydraulic circuit that you used for curl and dump and got satisfactory results. If things work when swapped, then look at the side that failed. Spring could have gotten weak on relief valve attached to control, or cylinder (inside the control) is leaking on that side. If you swap and it still doesn't work, time to renew the packing (seals) in your lift cylinders would be my first guess.
On ability to lift your machine, your hydraulic system should put out about 2500 PSIG at PTO rpms, a lot less at low rpms. If you had one square inch of piston area you would have 2500# of lift capacity at the cylinders on the loader. With usually 2 cylinders and 2" or so diameters, you have a lot more force available than that.......Force = PSIG x area of piston....(diamerer/2 squared x 3.14). There is an efficiency number associated with that which reduces the effective/usable force at the lift point, depending on the condition of, and design of your FEL.
Also is the foot-lbs part of the equation.....how far is your load from your lift point...pivots on FEL arms? Spec sheets on new loaders usually specify if rating is at lift arm pivot or usually 24" distant which doubles the lifting requirement for a given weight of load......and they go farther to specify if at full lifting height (because of FEL efficiency at different angles).
