Loader speed adjustment

[TractorGuy1]

Is there any way to adjust the speed that the loader lowers.
The loader on my 224 works good with the exception of the lowering rate. It drops to quickly and I am concerned that something will break when the joystick is returned to neutral and the loader comes to a dead stop.

I have flushed the entire hydraulic system with diesel and replaced it with AW32. The 3pt and steering work great but the drop speed of the loader concerns me and would like to adjust this if possible. Is it possible that the fluid is to lite.

Has anyone experienced this problem. Thanks in advance for all your help.

 

[RonMar]

Don't push the joystick as far?

What loader and valve do you have? Most joysticks have a rubber boot covering the linkages that actuate the valves. Have you removed this boot to examine the mechanism? You may be able to limit the linkage travel and control how much the lever moves the spool valve when lowering.

You could put restrictors in the working ports of the lifting circuit, but that would limit the lifting speed also.

 

[TractorGuy1]

I have the factory jinma loader that has a single joystick. Interesting you mentioned the rubber boot, as my loader never came with one.

I looked at the joystick valve but am not sure what to adjust. There is the linkages attached to each spool on the valve body but I think this may only adjust travel and not speed, but I have probably overlooked something.

 

[Soundguy]

Remember. .. if the spool uses linkage/valve travel to open orifices.. then if you limit the travel to limit max orifice opening.. then you have limited speed. I've never seen that perticular valve and am unsue if you can limit 'exhaust' without limiting 'extend'

Soundguy

 

[TractorGuy1]

The problem is I replied before thinking.
I will need to look at the assembly closer to see if the stick movement can be reduced then the valve piston will also move less resulting in slower loader drop. Seems like it should work as long as the linkage will allow this adjustment. I was hoping there was an easy way to reduce total flow through the spool controlling the drop.
I will check it out and let you know.

 

[ToolManRick]

I have to mention something that's out of my instruction manual, but I don't agree with it. Under the front of the seat there's a knob that controls the drop speed of the 3 point hitch. My manual says that it also controls the drop of the FEL. It sure doesn't on mine, but I don't have a Jinma loader either. After some experience you'll get used to how far to push the valve control lever. Sometimes speed is everything and getting that empty bucket on the ground is important, but fully loaded you have to just "tickle" it down.

Post a reply if the needle valve for the 3 point also controls your FEL. Just curious.

 

[RonMar]

Rick
Thats gotta be an error in the manual. The speed regulating valve you are refering to is bolted right onto the front of the 3PH lift cylinder. That is the only thing it is in series with and the only cylinder it could possibly control.

 

[ToolManRick]

Ya, that's what I figured too. An error.

 

[TractorGuy1]

There is a linkage from the joystick to each spool plunger, but there is no adjustment to limit its travel.
I will take a picture of the assembly and post it for suggestions.

 

[minidozer]

You could consider a variable one-way flow restrictor.
http://www.allstar.fiu.edu/aerojava/Hydr16.htm

 

[Soundguy]

Any chance you can add a bushing.. or locking bushing tot he spool rod to limit travel?

Soundguy

 

[TruChaos]

I fixed this problem by replacing the Jinma Joystick control with a three spool control. I only needed a two spool but, I installed a three spool so I would have a control for a bucket grapple.

Replacing the control with an American made unit worked wonders.

Now I have full control of the FEL speed.

By the way, don't mess with that little adjuster on the bottom of the Jinma joystick. It controls the lifting force and has a propensity for leaking once you mess with it.

 

[TractorGuy1]

I have attached one bottom photo of the joystick and control. Hopefully from the photos someone has a suggestion what if anything can be adjusted to control the drop speed of the loader.
How do I attach multiple photos

 

[TractorGuy1]

Another pic

 

[JohnS]

The Jinma controls, both FEL and Hoe, are hard to feather. I have the two-lever control, which I believe are easier to feather than the joystick control. Outside of the real fix, that TruChaos did, you might try mounting the control closer toward your body, easier to control. I did it here: web page But not sure if the same aplies to joystick. The fine line between too little and too much, would require some type of set-screw modification to the controls.

 

[RonMar]

Good Pics. From the looks of it, the block that the hand lever attaches to(the portion that tilts up and down) might be able to be limited in it's travel by drilling and tapping a hole in the top of the outer frame(part that rocks left and right, near the leading edge) and installing a setscrew. When screwed in, this would limit the amount the block tilts forward and stop the lever from pulling the plunger out as far thus limiting it's lowering speed. Not having the component in front of me though, I am not sure how much this would weaken the structure. You could experiment to see how this would work using a screwdriver blade or chisel head held in the gap above the up/down block to see how an obstruction there limits the lever travel/lowering speed. Another option that might be easier would be to attach a plate to the existing mount using the two mounting bolts that hold the valve to it's mount. The lever would run into this plate and limit how far the stick moves forward. By changing the position/shape of this plate, you could possibly limit the lowering speed.

Does this valve have "Float" capability? Limiting the lowering travel would prevent it from going into floating mode.

I grew up using 2 lever spools and have only used a joystick on a few occasions. If you are not into some light machine work, you could probably get a local machine shop to modify this part for you pretty quickly. A blocking plate could be made pretty easilly with a drill, grinder and jigsaw.

Replacing the valve with another might be a better option. Northern tool has a 2 spool loader valve with float on sale for $159 right now. My current loader valve dosn't have float and I really miss having it for fine gradeing, so I have been looking at this myself. My personal preference would be to install a 3 spool valve($234 at northern) as mentioned above for future expansion to control a grappel or front mounted trencher bucket. I have never owned a Chinese loader so don't know if there would be a confict with the hydraulic hose threads vis the standard threaded fittings found on a domestic valve.