Koyker 110 Loader

[PAB_OH]

I recently purchased a grey market Kubota that has a "new" Koyker 110 loader on it.

The other day I went to move some dirt from a hillside I've been chipping away at and when I pushed into the pile and went to curl the bucket back it momentarily started to come up and then dropped.

I played around for a minute or two and figured out if I only slightly pushed the lever it would curl fine but if I pushed the lever all the way to the left it acted like the valve opened all the way up back to tank. Curling the bucket down is no problem as is lifting and lowering the main arms.

So now I have to kind of feather the lever in order to get the bucket to curl. Anyone ever experience this type of "failure"? I can tear into it (the valve) but before I do I wanted to check and see if this is a known problem (I couldn't find anything doing a search) or at least get an idea for some of you might think.

I'm pretty handy with industrial hydraulics as i used to work on monster hydraulic presses so I'm okay with working on it. I'm just trying to make sure I'm not overlooking anything obvious.

I've never had one of these types of manual valves apart so I'm not sure what the mechanism inside looks like or how they operate. I also have not seen a schematic of the valve anywhere.

Anyone have any suggestions before I pull this thing apart?

 

[dubba]

does the float beyond the down position work?

When I first got my kioti 3054 with 110 koyker on it they had switched the lines so that left/right raised & lowered, up/down curled the bucket...

Sounds hard to do but my hydraulic valves were mounted so that they could be turned in the bracket easily. I simply turned the valve & handle to the proper orientation then put the lines in the right places.

 

[PAB_OH]

I'm not sure what you mean by "Does the float beyond the down position work".

My float position is UP all the way and it does work. Pretty much everything works correctly except the curl operation in the UP direction.

Just for clarification, moving the handle up lowers the arms, pulling down moves the arms up, moving to the left curls the bucket up and moving the handle to the right curls the bucket down. This is the correct operation, right?

Thanks for the advice.

 

[Dirthog]

the only thing float does is open the ports in the valve between the two cylinder ends to connect up & down. By the way most of the valves are set up until you get to larger and newer machine is you can only do one function at a time either up or curl

 

[MadReferee]

</font><font color="blue" class="small">( By the way most of the valves are set up until you get to larger and newer machine is you can only do one function at a time either up or curl )</font>

Not sure what you are trying to say here but the rate at which multiple functions will work is totally dependent on internal valve design. Just about every CUT and subCUT will allow multiple functions except those functions in the 7 o'clock position (raise/curl). That is because in that position gravity is not a factor and pump flow/pressure and valve priority take over which restricts usability of that combination.

 

[PAB_OH]

okay, found the problem.

There is a Socket Head Cap Screw connected to the spool for the curl operation that sticks out the back side (toward the front of the tractor) of the valve body. Apparently that SHCS can be adjusted in and out to control the speed of the curl operation. If it is backed out too far it seems to allow that spool to travle too far and the circuit to dump back to tank.

Cranking the screw in about 2-3 turns limits how far you can shift the spool in that direction and prevents the circuit from opening up bact to tank.

Funny thing is I see no way to lock the screw once the desired speed of operation is attained. There is a "housing" that screws down over the SHCS used for this adjustment though and I didn't pull it off yet to see if there might be a locking nut inside there.

Unfortunately I don't have much time to fiddle with it this weekend but I will try post a picture of what I'm talking about.

Thanks for the help.