loader problems

[willis123]

Hey guys!

I just installed a JM-ZL-20 front loader on my Case 255. I got a really good deal on the loader as it was still new in the crate. I had to fab up all of the mounting brackets though what a pain!! Anyhow the installation is complete and looks great. The bad thing is though the loader doesn't want to go up like at all. Seems like it wants to and sometimes it does a few inches or so.. Sounds like a drain on the motor. Like when your bucket is rolled back all the way and you continue to depress your control lever. All of the other functions work the roll back, dump, and down. The three point hitch also works. Any ideas? I'm a welder and fabricator don't know much about the hydraulic part of it. The tractor is 4x4 with power steering any help would be greatly appreciated!

 

[dex3361]

With the tractor off and the hydraulic pressure relieved take the quick connect fittings loose and reconnect them sometimes when you snap them in they will go on but not open.

 

[Diamondpilot]

How is your fluid level? Did you add any fluid when putting on the loader because as the cylinders fill it will take a good gallon or two out of the sump.

If the curl and dump work fine and the fluid level is fine you may have a couple hoses bass akwards on the lift function. Check it over good. If that is not it the only thing left is the valve itself. Also get rid of the Quick Connects. Especially if you have the Jinma ones on one side and Case on the other. Get swivel fittings and put them in their place. These QC account for about 90% of the hydraulic problems on Chinese tractors.

I have a feeling its something simple you are overlooking or missing. Have a mechanical buddy look it over.



Chris

 

[J_J]

How did you break into the hyd circuit to feed the loader?

Check and make sure that the line from the pump is going to the loader P port, and the PB out is going to the next valve, and the return/OUT is going to tank.

No tee's on the pressure line.

Double check the QD fittings and make sure there is flow through the QD's.



Does the 3pt work normally.

 

[willis123]

The Three point does seem to work fine.... I'm pretty sure its plumb right but with the power steering it kind of makes me wonder.

There is pressure line that comes off the pump to some sort of tee or two way split under the fuel tank. From there one line goes to the power steering and back out to the back of the tractor. The other line coming from the same tee or two way split under the tank runs on the right side of the tractor (loader control side) to the back of the tractor. That's the side I taped in to from the tee to the pressure side of the control valve. Then the three point from the loader valve to the other end of the cut tube. Did I make sense? What do you think?

 

[willis123]

The fluid level seems fine... The loader came full of fluid... Is that typical? Should I have drained every cylinder and them refilled them?

 

[Affordable]

You should have installed like this ,off the pump directly into the inlet of the loader valve,out of the loader valve to the diverter/priority valve valve that feeds the 3-point and steering

Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

 

[J_J]

Affordable,

I don't believe that is correct. You can not go to the FEL valve first, for this reason. If you are using the FEL, it could take all the fluid and none left for the steering. You never want the fluid diverted from the steering. It should have priority at all times. Flow should go from pump to divider valve which splits one line to the steering, and the other line to the FEL. Might be something like a 30/70 ratio of the total flow.

 

[J_J]

The Three point does seem to work fine.... I'm pretty sure its plumb right but with the power steering it kind of makes me wonder.

There is pressure line that comes off the pump to some sort of tee or two way split under the fuel tank. From there one line goes to the power steering and back out to the back of the tractor. The other line coming from the same tee or two way split under the tank runs on the right side of the tractor (loader control side) to the back of the tractor. That's the side I taped in to from the tee to the pressure side of the control valve. Then the three point from the loader valve to the other end of the cut tube. Did I make sense? What do you think?

If you have power steering, it is or should be fed from the pump, via a priority valve with relief. If no loader, the second outlet from the divider valve would go back to the 3pt. If you cut this line and fed it to the FEL valve P/pressure port, and then the PB to the other cut piece going to the back you should be good to go. If no PB on the FEL valve, , those valves feed the 3pt from the tank port. However most tank ports go to tank/sump.

 

[Diamondpilot]

Affordable,

I don't believe that is correct. You can not go to the FEL valve first, for this reason. If you are using the FEL, it could take all the fluid and none left for the steering. You never want the fluid diverted from the steering. It should have priority at all times. Flow should go from pump to divider valve which splits one line to the steering, and the other line to the FEL. Might be something like a 30/70 ratio of the total flow.

JJ, I know you know hydros but you are wrong. Every Jinma I have ever seen, 100's are plumbed this way. Mine is this way since 2003 with no issues. There is plenty of flow with its pump.

Mine goes sump, filter/screen, pump, FEL, Remotes (I installed), priority valve to feed steering and 3 point, then back to the sump.

No power beyond port, just input and output on the FEL valve.

Works great with no loss of steering even running my plow off the remotes in the avatar and log splitter and other implements off my custom installed remotes.

Tommy is 100% correct. He knows these tractors inside and out.

Chris