YM240 3point will only lift box blade 1/2 of its travel

[jb92563]

I attached my 4' Box blade this weekend and the arms only lift it about 12".

Unloaded Ive seen the 3 point arms move from the 8 oclock position to 11 oclock position but loaded with the blade they
only make it to the 9 oclock (horizontal) position.

I added more Hydraulic/transmission fluid thinking that may have something to do with it but there was no change.

It does not make any strange sounds or straining to reach that position, its like there is some kind of limit and it
just stops there.

Any ideas or suggestions on the cause/fix?

 

[winston1]

It should snatch up that 4' box blade. Questions RPMs of engine make any difference? Your side links should have 3 holes in the bottom yoke, which hole is your pins in? Yanmar Tractor Parts Fixed side link There is a feedback rod that limits upward movement but if you lift goes normal height without an implement then there would be no reason to suspect it being out of adjustment.

 

[clemsonfor]

Like winston said will it go higher if you rev it up to 1500+ rpms?

I bet you have worn parts in the system .

Bad piston O ring on the lift or worn valve allowing fluid to bypass internally instead of going into the piston cyl. THis is only apparent when the weight is on the arms.

But a Box blade is relitively light unless your trying to lift like a 6-7 footer with your tractor but i think you got a 4 footer if i remember right?

 

[careyo63]

"I added more Hydraulic/transmission fluid thinking that may have something to do with it but there was no change".

If it goes all the way up unloaded it's time to Service the Hyd. Sys.. Clean the Pickup screen and New JD303 spec. Fluid. Curious that there is no mention of any visable leaks? If the Hyd. Fluid is Low on the stick. Who knows how long it's been since it was Serv.
On my YM2000 the height of my Lift is controlled by how you set the Control Arm on the Left of the pick. "Blk. Handle" When the arms get to the highest point that is were it is set to start pulling and relieving the pressure to the control valve ".Stop The Lifting".

 

[jb92563]

Winston, the box blade is snatched up easily with no straining or sounds up to about a foot.
I used the lock valve to get it to stay there when not using it and it slowly comes back down in about 3-5 minutes,
so maybe the lift piston o-ring needs replacing?
My connecting rods are in the middle hole on the furthest out hole on the heavy bar that connects to the implement.
I think once I get the lift working properly I can use the regular ones, but since it only lifted 12" its the hole i needed to use.

Clemsonfor, I tried reving and no difference in the height achieved with the 4' box blade. After reading a bunch of other posts my symptons seem to be matching the o-ring problem
especially due to the slow drop when the locking valve is closed. No external leaks of fluid.

Careyo, I have used the JD303 from Walmart. I'll bet the screen needs cleaning and will take a look at it. No Leaks.
That control arm picture is revealing as I keep looking at mine wondering what it does, but then I noticed in your picture that the pin is located behind the little bar that
pushes on the control plunger, but on mine its on the front side and did not seem to do anything.

That may also be part of my problem as I was feeling that if I could push the plunger in further it would cause the lift to go higher.

I'll clean my pickup filter and see where I can get the o-ring for replacement as well. Does Hoye stock it?

 

[winston1]

If it takes 3-5 minutes to leak down the lift piston o-ring is not your problem. The linkage Carey has pictured is the feedback rod and must be adjusted properly to get correct lift height. You should be able to watch yours while operating and tell if it is stopping your lift. You do not want to adjust it to high so as your lift piston bottoms out and causes damage.

Having said all that I can't understand why yours would raise with nothing attached. That would indicate it is not an adjustment. :confused3:

 

[careyo63]

Your Lift hasn't reached the Max height. If it did the Tractor will Bog from the Arms not being able to move Further up. Your hear the Hyd. pump Whine also when it does. Check the Height Adj. and watch it's set to the top. I Top mine out and then Set the Adj.Nuts on the Rod to a good 1/8 of a inch to prevent from topping out. Make sure the Feedback Linkage isn't getting in a bind and changing the Height. Still does it clean the Hyd. Screen probably restricting or Lack of Fluid to the pump. IMO.

 

[clemsonfor]

"I added more Hydraulic/transmission fluid thinking that may have something to do with it but there was no change".

If it goes all the way up unloaded it's time to Service the Hyd. Sys.. Clean the Pickup screen and New JD303 spec. Fluid. Curious that there is no mention of any visable leaks? If the Hyd. Fluid is Low on the stick. Who knows how long it's been since it was Serv.
On my YM2000 the height of my Lift is controlled by how you set the Control Arm on the Left of the pick. "Blk. Handle" When the arms get to the highest point that is were it is set to start pulling and relieving the pressure to the control valve ".Stop The Lifting".

Forgot to mention cleaning the screen first. Good thing there are multiple members here

 

[clemsonfor]

The implement can leak down due to a worn valve as well, but when you shut the knob closed that will eliminate that.

the housing the spool rides in in my valve is worn and allows fluid to bypass. Mine still leaks down but i have replaced all the orings in the valve and the lift piston ring. Its just worn out, it bugs me but not enough to spend $600 on a new one. Steve at spalding when i was talking to him said "why fix it you have done all you can, just forget about it and live life". Its one of those things that i just want to be right. I may not have all new stuff but my stuff usually works as best as it can!

 

[jb92563]

Here are a couple pictures of my feedback linkage.

Note the "Pin" part is between the actuating bar and the plunger and NOT behind it.
It looks to me that at no point in the travel will it effect the plunger actuating bar, and it looks backwards compared to the picture Careyo posted.

My feedback VS Carey0

VS