Hello, new to the forum and need some help. Have recently purchased a LA1353A loader that came off of a M9540 cab tractor and have put it on a M9540 open station tractor. Installation no problem, joystick function up and down fine, but the tilt on the bucket is backwards. Pull joystick toward you, bucket dumps, push away, bucket comes up. Logical thinking says switch the hoses, but when that is done all the bucket wants to do is dump, on both positions of joystick. We are buffaloed as is a couple of different Kubota dealers that I have contacted about the problem. It has to be a problem at the valve but no one seems to have heard about any issues with the valve. If anyone has seen this before or might know where the problem might be, any help would be greatly appreciated. All hose connections have been checked multiple times (as to insure their proper locations). Thanks, David
Problems with La1353 loader
- Thread starter kubota77hudd
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gpreuss
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After you swapped the hoses did the up-down still work OK? On the valve you are swapping the hoses on either the right side or left side, not the front two or back two, right?
Are you 100% positive you have valve attached to tractor hyd's correctly IE pressure to pressure & return to return & PBY to PBY???
Swapped the hoses on the quick connect dash, top two are the bucket controls. When swapped bucket action would only dump. Loader still raises and lowers fine.
North Idaho Wolfman
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Which valve do you have there are 2 different valves offered for that model loader.
I would say you have a bad disconnect, or blown seals on the lift cylinders.
Logic being if you swap the top two lines, roll, for the bottom 2 lines, lift, roll should work fine and lift should stop working.
Work with one set at a time and make sure lift will work on both sections of the valve (lift ports, and roll ports), that might eliminate a bad section.
If lift works on both sections swap out the quick disconnects on the hose side of the lines that goes to the cylinders.
I would say you have a bad disconnect, or blown seals on the lift cylinders.
Logic being if you swap the top two lines, roll, for the bottom 2 lines, lift, roll should work fine and lift should stop working.
Work with one set at a time and make sure lift will work on both sections of the valve (lift ports, and roll ports), that might eliminate a bad section.
If lift works on both sections swap out the quick disconnects on the hose side of the lines that goes to the cylinders.
Yes, have swapped lines, put lift in place of curl, same situation. Up/down works, if you swap the hoses all it will do is go up on both functions side to side. It appears that the problem is on one side of the valve.
Thank you all for your input.
Sorry, standard valve. not the self leveling.
Thank you all for your input.
Sorry, standard valve. not the self leveling.
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gpreuss
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Perhaps hoses were swapped around on the loader itself for some reason? Trace all of the hoses and make sure they are hooked up properly.
If they're all correct I'd have to say it's an internal seal on one of the dump cylinders, if not both. Previous owner could have hit something in the ground with the bucket in dump position. Doing so could create 15,000 PSI or more cylinder pressure depending on speed which is plenty force to break all kinds of things.
If they're all correct I'd have to say it's an internal seal on one of the dump cylinders, if not both. Previous owner could have hit something in the ground with the bucket in dump position. Doing so could create 15,000 PSI or more cylinder pressure depending on speed which is plenty force to break all kinds of things.
Yep, all hoses have been checked multiple times. Only thing we can figure is a defect in control valve. Loader is new, taken off of a cab tractor. Checking to see if might be some warranty.
gpreuss
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I cannot see how the valve can be bad if the dump works OK backwards! That sort of eliminates any problem I can think of with the hoses and cylinders. I keep thinking you are swapping one hose from dump and one from lift, but you've said lift still works OK. Stumped.
Did a pressure check on valve. When joystick was pulled over, both sides of valve had 2800# of pressure. One side should have been 0.
Per the 3rd post in this thread, you stated that you swapped around the quick connect lines and the issue was still present. If you did indeed remove the lift cylinder hoses and place the curl cylinder hoses in their place and the issue with the curl cylinders was still present, yet the lift cylinders still "worked properly" when hooked to the curl function of the FEL control, I think you didn't actually check to see if the functions were indeed working properly.
Did you verify that the Lift cylinders, when told to lower all the way down, would lift the front end off of the ground? I do not think you verified the proper functionality of the loader. If you input equal pressure to both ports on a cylinder, the extend function will always work as you have more volume and thus more force acting on the extend. Movement does not equal proper operation. Sounds like you're in for a full rebuild of the valve.
" If you input equal pressure to both ports on a cylinder, the extend function will always work as you have more volume and thus more force acting on the extend."
That info explains why the dump worked on the curl command. Both ports were at 2800# pressure at same time so the dump worked instead of the curl and if you switched the hoses dump was all that worked on both commands.
Do you know if these valves can be rebuilt and if so, where?
Thanks for the info!
That info explains why the dump worked on the curl command. Both ports were at 2800# pressure at same time so the dump worked instead of the curl and if you switched the hoses dump was all that worked on both commands.
Do you know if these valves can be rebuilt and if so, where?
Thanks for the info!
Minor point, but it's piston surface area, not volume. Pressure * area = force.
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Only thing that can be rebuilt on a spool valve is leaks on the ends of spools and rusty/dirty detents or broken springs. If there is wear between spool & housing then complete valve must be replaced to correct problem.
North Idaho Wolfman
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If your spool valve has O-rings and seals Internally then yes it can be rebuilt
and you could do it yourself with the parts fix.
Otherwise most hydraulic repair shops can do it.
and you could do it yourself with the parts fix.
Otherwise most hydraulic repair shops can do it.
however you mounted the joystick you have it 180 degrees tured from where it should be. It is normal on the midsize M Kubota loaders to supply oil to both ends of the cylinders for dumping the bucket. It allows for a much quicker dump function. Just turn the joystick 180 and you'll be fine!