sgtboz
New member
Thanks for the heads up, Kenny. McMaster can be a beast to navigate so it looks like a quick order on your site might be considerably easier.
Bump up lift capacity of L3400/LA463 Loader
- Thread starter Goog
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Thanks for the heads up, Kenny. McMaster can be a beast to navigate so it looks like a quick order on your site might be considerably easier.
Here is a picture of the wet gauge I installed today. BTW it was set at about 2275 and plan on bumping it up to 2650. I have a 4 in 1 that has been the best thing I could have ever put on, and I think it will really help the grab capacity.
sgtboz
New member
I just put mine on for purposes of evaluating the b4 and after pressure.
Thought I would give a update on my L3700 after the pressure was kicked up. Yesterday morning I used the machine to rip out a granite curbed island. It was concreted in with aspalt on one side and processed gravel on the inside that had mulch over it. The hoe definitely had more power and actually tossed the tractor around quite a bit. I had a set of Cat forks on the front that weigh aprox 300 pounds. I was still able to lift 3 pieces of granite curbing 5-6 feet long at once. The weight with those pieces on the forks was very noticeable when steering. IMO , I would not have been able to rip out the concrete with the original psi setting.
Just did mine today went up to 2650 psi. Can't wait to try it out although I can tell a difference in a few little things I did today. BTW it took a full 15 minutes to complete and the vacuum trick worked great I didn't lose a drop of fluid.
Drewdaman
New member
OK, I just received my test gauge from Kenny's Bolt On Hooks and it seems like a very nice quality setup. Given the high quality and quick shipping time, I'm very pleased with this purchase and looking forward to testing my new-to-me tractor tomorrow.
And because I'm new to tractors, I want to make sure that my plan for testing and adjusting the psi on my tractor is correct, as follows.
Background: I found this thread because I was searching for guidance regarding correcting a problem with the tractor - the FEL is not operating properly, that is, I have to really increase the RPM's to get the boom to lift, and then when it finally gets up, it immediately wants to come back down, it won't hold in one position. And to confirm, the 3 point hitch seems to work great, it very easily lifted the backhoe and held it at any height I wanted.
Recently, I had a hydraulic repair company come out and take a look at the FEL, and the guy tested it and concluded that all 4 cylinders have to be rebuilt. I'm not convinced that that is the (only) problem, I'm concerned that the FEL control valve may not be operating properly, however given that the tractor is 30 years old, it seems prudent to rebuild the cylinders so I have purchased the Kubota seal kits and am awaiting their delivery.
Question: can someone please confirm that it is okay for me to test the system "as-is", and adjust the PCV based on my test results, even though the rest of the system is not operating properly?
In case it is helpful, this is on a Kubota M4950DT and the WSM indicates that the "Relief valve setting pressure" is 2560 to 2631 psi, so I'm shooting for 105% of the top end of the factory spec, or 2760 psi.
Thanks in advance for any input.
Drew
And because I'm new to tractors, I want to make sure that my plan for testing and adjusting the psi on my tractor is correct, as follows.
Background: I found this thread because I was searching for guidance regarding correcting a problem with the tractor - the FEL is not operating properly, that is, I have to really increase the RPM's to get the boom to lift, and then when it finally gets up, it immediately wants to come back down, it won't hold in one position. And to confirm, the 3 point hitch seems to work great, it very easily lifted the backhoe and held it at any height I wanted.
Recently, I had a hydraulic repair company come out and take a look at the FEL, and the guy tested it and concluded that all 4 cylinders have to be rebuilt. I'm not convinced that that is the (only) problem, I'm concerned that the FEL control valve may not be operating properly, however given that the tractor is 30 years old, it seems prudent to rebuild the cylinders so I have purchased the Kubota seal kits and am awaiting their delivery.
Question: can someone please confirm that it is okay for me to test the system "as-is", and adjust the PCV based on my test results, even though the rest of the system is not operating properly?
In case it is helpful, this is on a Kubota M4950DT and the WSM indicates that the "Relief valve setting pressure" is 2560 to 2631 psi, so I'm shooting for 105% of the top end of the factory spec, or 2760 psi.
Thanks in advance for any input.
Drew
LD1
Epic Contributor
Test it as is, and if it is at or near spec, I wouldn't adjust until the loader is taken care of.
Sounds to me like you need a new valve. Cylinder seals will not cause a cylinder to leak down with a tandem center loader spool. Just ain't gonna happen unless you are leaking oil (equal to the displacement of the rod entering the cylinder) all over the ground.
The high rpm to get it to raise could be a sign of cylinder seals. Oil leaking by and returning thru the rod port back to tank. But so could the valve.
With the fast leakdown also, you have valve issues or a massive leak
Sounds to me like you need a new valve. Cylinder seals will not cause a cylinder to leak down with a tandem center loader spool. Just ain't gonna happen unless you are leaking oil (equal to the displacement of the rod entering the cylinder) all over the ground.
The high rpm to get it to raise could be a sign of cylinder seals. Oil leaking by and returning thru the rod port back to tank. But so could the valve.
With the fast leakdown also, you have valve issues or a massive leak
First, you really should to start a new thread, since this thread is from a different model (and issue)...
...as for if you should test the FEL with a leaky valve and/or cylinders, I personally don't see a reason to do it. You don't know how much hydraulic oil is actually dead heading into the gauge giving you an accurate reading vs. how much pressure will be leaking around the valve. I don't think you will know if it's an accurate reading or not.
Doing it to know what the reading is, yea fine. But I would not try to adjust the pressure based on what readings you get... I can easily be wrong about this but seem to me, rebuild the the cylinders and/or valve, first to make sure that was your problem. Adjust the pressure as the last step.
...as for if you should test the FEL with a leaky valve and/or cylinders, I personally don't see a reason to do it. You don't know how much hydraulic oil is actually dead heading into the gauge giving you an accurate reading vs. how much pressure will be leaking around the valve. I don't think you will know if it's an accurate reading or not.
Doing it to know what the reading is, yea fine. But I would not try to adjust the pressure based on what readings you get... I can easily be wrong about this but seem to me, rebuild the the cylinders and/or valve, first to make sure that was your problem. Adjust the pressure as the last step.
