John Deere 4200 loader slow

[Duff]

Hi Dmatt

Im unfamilier with the John Deere 4200 tractor, however most tractors hydraulic systems are a gear driven pump, with a open port valve ( the valve in the neutal position the oil will flow from Pressure port to Tank port ).

So the very 1st thing I would do, is check your linkage on your tilt/ lift valve and make sure you get full travel of your valve. If your not getting full travel of your valve then oil will be bypassing back to tank.
So check that there is no build up of dirt or linkage is worn etc.

Check your Q.Ds are fully connected !
Personally Im not a big fan of Q.Ds. If you disconnect very rarely or not at all, then take them off. Just join your hose to the fitting. You will get a better flow of oil to your implements.

When you lift/ tilt can you hear any "squeling" noises at high revs?
You may have some crap in your relief valve. Try extending your cylinders to the end and the rev the **** out of your machine while holding open the lift/ tilt valve. This has worked for me in clearing away some crap in the relief valve.

Get a gauge and check your pressure.
If you dont wish to buy a guage, remove, strip and clean the relief valve. Make sure you measure the adjustment of the needle on the relief valve before disassembling. The most accurate way is with a gauge when checking/setting up the pressure again.

Still no good, remove pump and inspect.

Best of luck

Duff

 

[arrabil]

Thanks for the links Kenny!!! Those are not the pieces I found on my own.

 

[beenthere]

Duff
Welcome to the Forum.


Will look forward to more good information that you can share.

 

[USMC.27]

I had the same problem with my 4200 with 420 FEL. the service center said that the diverter valve was sticking. They said that the cleaned it and it has worked fine ever since.

 

[Egon]

the service center said that the diverter valve was sticking.

I would tend to agree with that.

I have the same tractor and loader with attached backhoe. Just recently I got the manual for the tractor.

There are two ports on the underside beside the hydro filter for checking pump pressure. There are also two relief valve's located in the same area. These are non adjustable. It does state that for checking pressures at these locations a pressure gauge of at least 6000psi??? be used??

Just from looking at the manual removing the pumps is not a ten minute job but serious dismantling.

If you wish I could scan and send some pictures.

 

[Dmatt1222]

I appreicate the warm welcome to the forum. and the great response to my hydro problem from some very knowageable persons.

Considering all the advice given I think my first step will be to
1. Recheck all suction lines
2. Extend the cylinders fully and rev the engine hoping the relief valve
blows through some junk, cleaning itself out.
3. Remove the relief valves inspecting for junk.
4. Check system pressure
5. Inspect and clean SCV

EGON, If you have some info on the diverter/ relief valve, a scan would truley be helpful. I do have a owners manual but have no access to a service
manual.

Thank you guys, I'll let everyone know what I find.

Dan.

 

[Egon]

I only have the service manual for the tractor but not the loader. Ill try and get something scanned for you later today.

I`m assuming you have checked the manual linkages for proper action and oiled them as well.

 

[dcyrilc]

Dmatt1222 & Duff... Welcome to TBN.

 

[kennyd]

I had the same problem with my 4200 with 420 FEL. the service center said that the diverter valve was sticking. They said that the cleaned it and it has worked fine ever since.

What diverter valve? Where is this diverter valve? We may be talking different terminology-but there is no "diverter" valve that I am aware of.

 

[mjncad]

I only have the service manual for the tractor but not the loader. Ill try and get something scanned for you later today.

I`m assuming you have checked the manual linkages for proper action and oiled them as well.

I don't think the loader has a shop manual per se; just the owners manual, and an installation manual. Here is where to get manuals for your Deere. John Deere Technical Information Bookstore - Home Page I got my shop manual on CD as it was half the cost of hardcopy, and I can print out replacement pages at will to replace greasy ones.

What diverter valve? Where is this diverter valve? We may be talking different terminology-but there is no "diverter" valve that I am aware of.

I think the "service center" meant SCV valve.