3-Point Hitch 3-point hitch not working

[JohnDeere4300]

That's the main screen in the bottom of the sump (#4 in the diagram)...if it's clogged then the loader would not work either-and the tranny would be having issues as well.


This is a simple problem...I just know it is!

The manual is showing a "rockshaft control valve filter"

Note: If changes in the operation of the 3-point hitch lift capacity are detected or the rockshaft control valve should begin to react slowly, erratic or fail to cycle properly, performance of this service procedure may be required.

Its showing in a picture to take the seat and the whole platform out, to get to the "Rockshaft Control Valve Filter"

 

[dlatzko]

I am now confident that all the hoses are connected properly. Kennyd is correct that the 3PH is bypassed hydraulically when the BH is attached, because the backhoe fluid goes to a return directly to the sump. When the BH is removed, the the return is connected to a line that goes somewhere under the seat and presumably to the 3PH valve. Mine is now and has been connected correctly since I started reporting here. I rechecked all connections

Last night I removed the return connection at the Power Beyond to check flow. I had great flow of the fluid, so no clog in the flexible lines to that point. Tonight I will try JD4300's idea that there is a filter at the point that the solid return line enters under the seat assembly.

BTY yesterday I called the service department at the local dealer to see if I could get some free technical advice. Let's just say that you guys are miles ahead in terms of specifics and helpfulness! I'm not giving up yet.

 

[dlatzko]

The manual is showing a "rockshaft control valve filter"

Note: If changes in the operation of the 3-point hitch lift capacity are detected or the rockshaft control valve should begin to react slowly, erratic or fail to cycle properly, performance of this service procedure may be required.

Its showing in a picture to take the seat and the whole platform out, to get to the "Rockshaft Control Valve Filter"

Are you looking at the Parts Manual , or Service Manual? I only have the simpler Operator's Manual. Also, since you and I have the same machine, what year did you buy it? I have a late 4300, purchased in March 2001. Some of my minor features do not exactly match those pitures in the Operators Manual, like the SCV lockout mechanism, etc.

 

[JohnDeere4300]

I only have the simpler Operator's Manual. Also, since you and I have the same machine, what year did you buy it? I have a late 4300, purchased in March 2001.

That is what I'm looking in_"Operator's Manual"__On page 66 & 67 "Checking the rockshaft control valve filter."

Mine is a 01 model...(these manuals are a joke,) and they are not all the same...Mine didn't tell about changing the wheels around for Width, But i found out on here that i could.

Like Kennyd said, it has to be a simple thing.

If your manual is the same look on that page 66 & 67__Or look in the index and look for" Rockshaft Control Valve Filter"___checking and cleaning.

 

[jenkinsph]

Having been around tractors for 45 years I would be very surprized if the rockshaft filter will be the problem. Normally you would get some movement even if it is slow and jerking with a filter problem. As I understand, you are not getting any change in movement or sounds. Also that is a fairly new tractor have you had any metal filings or other problems that would have caused this? If not I would keep looking.



Steve

 

[JohnDeere4300]

Service & Support : Troubleshooting乏ockshaft and 3-Point Hitch

Go down to where it say "hitch fails to lift or lifts slowly"

It tells the same thing in the regular operators manual.

 

[dlatzko]

OK, I have finally diagnosed the problem, but I have not fixed it yet. The problem was the limit control. (position control?) I removed the entire seat assembly. I could then see the two shafts coming out of the rockshaft area of the transmission , the higher shaft is the lever linkage and below it, the limit control shaft. I assume that this limit shaft is some sort of overflow valve that tells the rockshaft valve not to operate when it hits the limit point. So when the dealer installed my 447 BH two years ago, he failed to readjust the limit control. So the 3PH position with the BH mechanically mounted on the tractor was beyond the limit point, so no movement at all. I had to disconnect the limit linkage and move it by hand PRESTO!!! the rockshaft came to life! Now I am really annoyed because the nuts that require adjusting on the limit control linkage will require some fancy side load wrenches becasue it is really tight working in there. It got dark and I could not work on it any more tonight, but thanks you all for all of the ideas. I would not have had the patience without the daily help and ideas.

Kennyd, do you have the diagram of the limit control linkage? It is really hard to tell whether some of the threaded areas are seperate links or one piece, I'll need to figure it out to make the adjustment.

 

[jenkinsph]

Glad that worked out for you with no major expenses. I mentioned the linkage and position control because the old 20 series used to have similar issues years ago. Generally speaking when you have a flow restriction in a hydraulic line it is readily apparent, and will be noisy.



Steve

 

[kennyd]

Kennyd, do you have the diagram of the limit control linkage? It is really hard to tell whether some of the threaded areas are seperate links or one piece, I'll need to figure it out to make the adjustment.

The one I posted in post #26 should be the one you need...if not I will dig deeper later when I get home.

PS. I get them from www.jdparts.com, you can get them also for free...you just need to think like a parts guy

 

[JohnDeere4300]

Hope you finally got it fixed.