3-Point Hitch F235 3pt not operating

[vietvetharry]

I recently replaced the hydraulic pump due to cracked housing. I also replaced the filter obtained from Hoye.
Now the 3pt will not operate in either direction. While the tractor is running I can manual lift the 3pt with no resistance.
The UFO is not connected other then the small joystick for controlling the 3pt. It operated correctly until now.
Other than the filter I don't believe there is a screen to clean for this model.

Since I can lift the 3pt manually does anyone think the problem is mechanical vs. hydraulic?

I openned the Relief Valve & removed the Stop Valve. In both cases hydraulic fluid flowed.

Any suggestions?

BTW: Has anyone ever translated the Japanese on the UFO unit?
vietvetharry Posts: 3 Joined: Sun Aug 22, 2010 11:26 am

 

[normde2001]

"I openned the Relief Valve & removed the Stop Valve. In both cases hydraulic fluid flowed."

Did it flow, or did it spew, under 2500 psi pressure? I believe all Yanmars have a hydraulic pickup screen.

 

[vietvetharry]

It came out with high pressure from the relief valve. I had to catch the internal part in a cup. From the stop valve it just ran out, I didn't have the tractor turned on.
The only wiring active from the UFO are the wires from the joystick to the control valve solenoid that is attached to the hydraulic clyinder case.

 

[normde2001]

It came out with high pressure from the relief valve. I had to catch the internal part in a cup. From the stop valve it just ran out, I didn't have the tractor turned on.
The only wiring active from the UFO are the wires from the joystick to the control valve solenoid that is attached to the hydraulic clyinder case.

So you still don't know if the pump is pumping.

 

[vietvetharry]

Sorry I didn't respond very clearly. After I removed the pressure relief valve I did start the tractor and the hydoil squirted out under pressure.
I openned the stop valve after I turned the tractor off and since oil flowed out I didn't think to try it turned on.
I do believe the new pump is working.

 

[John47]

Can you drive it??? ie I had a similar problem, only the clutches weren't operating either. I found a ten amp glass fuse blown. The fuse is an inline fuse holder type under the metal covers beneath the drivers seat.
Still to this day haven't found why mine blew, but the fuse is in line with the hydraulic solenoid circuits.

 

[1danny]

I recently replaced the hydraulic pump due to cracked housing. I also replaced the filter obtained from Hoye.
Now the 3pt will not operate in either direction. While the tractor is running I can manual lift the 3pt with no resistance.
The UFO is not connected other then the small joystick for controlling the 3pt. It operated correctly until now.
Other than the filter I don't believe there is a screen to clean for this model.

Since I can lift the 3pt manually does anyone think the problem is mechanical vs. hydraulic?

I openned the Relief Valve & removed the Stop Valve. In both cases hydraulic fluid flowed.

Any suggestions?

BTW: Has anyone ever translated the Japanese on the UFO unit?
vietvetharry Posts: 3 Joined: Sun Aug 22, 2010 11:26 am

There is a hydraulic screen in the transmission of your F235.

Danny

 

[vietvetharry]

Thanks John & Danny,

I will check for an in-line fuse between the joystick & solenoid wiring.

I found in the Hoye parts catalog a screen they had referenced as an oil screen. It showed as being in the transmission case so I guess I was wrong in assuming it was for motor oil , my bad! I will be checking it tonight.

 

[YanmarFever]

Harry,
Check the ground wire that comes from the control wires to the solenoid,
it bolts on the fender, make sure it has a good connection.

Also you can manually push a button on the ends of the solenoid, they are covered by rubber caps, there is one on each end of it.

Sometimes it will help the 3 point to purge , and start working again.

There is an internal fuse to the unit, but you have to remove the metal inner side plate to see it, or remove a black plastic cover on the end of the control panel, toward the rear.

There are 2 kinds of ufo controls for the F235.

 

[vietvetharry]

Thanks Ernie, it looks like you were up late last night on TractorByNet; don't you have a life or something better to do?

My UFO was never connected other than the 3pt joystick. I think I would like to use the leveling function. Can you sell me an intact UFO control unit? How can I determine which setup my tractor has?

 

[YanmarFever]

Harry, my wife lets me stay up until 10 pm sometimes
we are a couple of hours behind you, (pacific time).

The 2 different ufo controls do the same thing, they only look different.

We do have a bunch of controller's and hydraulic cylinders for the 3 point,
however you should try to fix the one you have there (cheaper).

Have you checked the ground wire yet ?

Harry, whenever I remove a hydraulic filter from an F model, I fill the new filter with hydraulic oil, then I screw it on, yes its messy, but it sure eliminates the problems.

 

[vietvetharry]

Sure glad you have an understanding wife, but you were pushing it at 9:40 last night.

No, I'm a working guy during the day so I won't be able to hook everything back up and check for the hyd screen until this evening. I only had a chance last night to glance at it, but the screen cover did not jump out at me. It looks like I might need to remove a cover. Any suggestions for an F235? I believe you have one or two.

I've seen those rubber caps on the solenoid and will try pushing the plunger.

Good suggestion on the filter, but a little late. Will definitely do next time.

 

[YanmarFever]

Harry, before you remove the filter cap door, remove the hyd oil filter because im willing to bet that its dry inside.
Fill it with hydraulic fluid,(messy) and screw it back on,it might make the 3 point work up & down.

 

[vietvetharry]

Sorry Ernie, too late, I didn't read this until I finished with the tractor. Now let me tell you all want I found.

I pulled the screen and found it remarkably clean. I replaced it and put back approx. 3 gallons of the drained hydfluid. I plan on adding more fresh fluid tomorrow.

After starting the tractor I tried the 3pt with the joystick control. It would not operate. I tried your suggestion with the solenoid buttons and it worked. The top cylinder raised the 3pt & the bottom one lowered it. I moved it up & down probably 10 times and tried the joystick every few, but the joystick never worked. I disconnected the wires between the joystick & the solenoid and was still able to raise & lower the 3pt. from the solenoid buttons.

I then tried pushing the buttons on the swing solenoid that had no wiring attached & found hydfluid leaking down the back of the casing. Each time i pressed the buttons more flowed. I will need to remove some brackets & framing to see where it is leaking. Since I do not use the swing is it possible to disable or discconnect it from the hydraulic lines?

The ground was secure from the control valve. Do you have any idea why the joystick would not operate? Would it possibly work after I finish filling with fluid? I don't see any broken wires, but I'm thinking of re-wiring since the current setup has a number of spliced sections.

 

[YanmarFever]

Harry, since it works manually:thumbsup: (push button) I still think its your ground wire,
The one that grounds on the fender.
Remove the wire, scrape it clean, and see what happens.....

 

[clemsonfor]

If you caught that fluid in a clean container (what i would have done) put it back in the tractor, its prolly cleaner than the inside of the tractor.

If not filled when you were working with it that may have not helped the problem.

 

[vietvetharry]

Discussion continued on new thread "UFO joystick wiring F235"