Hydraulic Screen and Chatter On 3020

Guys,

I feel like i should be able to get this but I am having a few issues. First Question: Where is my Hydraulic Screen in the photos below. I have removed the two smaller bolts and didn t look right. The big square bolt will not budge.

That all said, I said screw it and filled the fluid back up.

Well the chatter i had pre change out is still there up front and under steering wheel. If i move the 3 point up and down it will quiet out. The 3 point settles quickly when tractor shuts down. Power steering appears to be fine. In my research is says clean screen first! Well i know, i have to take fluid back out.

Thoughts on chatter. My service manual is on way!
 

Below is a photo with trans sump screen plug location for your tractor.

mvphoto48685.png
 
Thats where the screen is... smack it with a hammer a cople times...it will come right out.
 
Hard to describe chatter. Chirping is probably stroke control valve.
Goes away when using hydraulic function and comes back immediately.
Worn pump drive noise can come and go also.
 
Mine is an internal square yours Is an external
square . Could also hear it bit with a small propane
torch
cvphoto4107.jpg
 
learned some things today that may give me some direction on chatter with your help.

The chatter is coming from the left side of engine up high.

At high RPMs the chatter don t stop with working the 3 point hitch. But at about 1000 when work 3 point, the chatter stops momentarily.

Steering works fine, PTO appears to work fine.

Got that screen out finally, it was a little dirty but no ways near plugged.

thoughts?
 
The chatter is coming from the priority valve. It is opening and closing constantly. Can be a leaky component or a bad pump with a few broken valves.
 
they all somewhat chatter. That is way Deere installed a noise attenuator hydraulic accumulator on some models that had factory cab . 6030, 500c et.
 
(quoted from post at 01:39:52 02/08/20) The chatter is coming from the priority valve. It is opening and closing constantly. .

Having diagnosed closed center hyd malfunctions for many yrs IMHO stating ""priority valve is causing the chatter" is a broad statement that may or may not end up being true when the cause of chatter has been located.

Opinions are similar to "belly buttons" and we all have one. :lol:
 

Buick, got everything drained now so can t check that at moment. Do you mean the lever under the seat in the lowest position toward floor board?
 

Buick, got everything drained now so can t check that at moment. Do you mean the lever under the seat in the lowest position toward floor board?
 
(quoted from post at 22:22:14 02/08/20)
Buick, got everything drained now so can t check that at moment. Do you mean the lever under the seat in the lowest position toward floor board?

The actual rock shaft control valve. Trying to find out if the hydraulic problems continue when the rock shaft control lever is in it s lowest position .
 
(quoted from post at 21:22:44 02/08/20)
Do you mean the lever under the seat in the lowest position toward floor board?

For hyd diagnostics L/D lever under seat should be set in "D" which should lock out any automatic 3 pt hitch control capabilities of control mechanism.
 

All my testing, driving around, etc. the lever was in the L/D position.

Pulled the pump coupling apart today and found two things. #1 - one bushing was in pieces, and all the bushing didn t match. #2 - the mating coupling just slid right off pump shaft with no need to loosen bolts. Fingers crossed that was my noise, but really don t think so.

Really heard the noise loud at priority valve.
 
Be sure to inspect the condition of the internal splines of the pump coupler closely. If it has been allowed to operate loose for awhile there's a good chance that there is significant wear.


(quoted from post at 13:50:59 02/09/20)
#2 - the mating coupling just slid right off pump shaft with no need to loosen bolts. Fingers crossed that was my noise, but really don t think so.
 
(quoted from post at 20:14:54 02/07/20) learned some things today that may give me some direction on chatter with your help.

The chatter is coming from the left side of engine up high.

At high RPMs the chatter don t stop with working the 3 point hitch. But at about 1000 when work 3 point, the chatter stops momentarily.

Steering works fine, PTO appears to work fine.

Got that screen out finally, it was a little dirty but no ways near plugged.


Adding one more thing, although it appears everything works as it should, i remember the 3 point won t stay up more than 10 minutes once tractor is shut off.

Any ideas on what else i should do while i have all the fluid drained?

thoughts?
 

To check to determine if priority valve is the cause of chatter just remove spool from priority valve housing,reassemble & start engine. Hyd should operate only problem will be when turning, steering wheel can hesitate when other hyd functions are utilized simultaneously. 3 pt settling when engine isn't operating could be internal leaking control valves or faulty rockshaft piston seals which seals can be R&R by removing cover in photo below to access piston/seals.

mvphoto49119.png
 

Thanks Jim, looks like good direction. Can you help me identify the part keys for the spool in the PV? and the piston seals? i looked up drawings for both, but not completely evident to me.

Thanks
 

RS piston backup washer R26754
RS piston o-ring R26543
RS piston cover seal R34154

Have you ever checked hyd stand-by pressure which should be 2250 psi? I think hyd stand-by pressure if close to 1700 psi could cause priority valve to chatter.

To isolate priority valve remove all parts in photo then reconnect hyd line then start engine to see if chattering disappears..

mvphoto49123.png
 

Sorry for the poor photos, that didn't work like I expected.

I haven't checked pressure yet. Where do you check it at? I need to purchase a gauge, that is on the list.

Just trying to get done what I can while all the fluid is out. I am fine with replacing seals and orings, etc. Cheap and probably needs done any way why its in the garage.
 

Easiest location to check hyd stand-by pressure is by plugging a 5000# gauge in rear breakaway coupler then move lever correct direction to pressurize the gauge.
 

One more question if I may? I have the Hyd Cooler out of the tractor, going to have leak repaired. Should I rebuild or doing anything with the bypass valve? Was planning on changing hoses at a minimum.
 
(quoted from post at 10:25:28 02/11/20)
RS piston backup washer R26754
RS piston o-ring R26543
RS piston cover seal R34154

Jim,

I replaced those recommended rock shaft parts and the 3 point will stay up longer, but still falls overnight. Not really a big deal i don't guess. But, now the 3 point won't lower with the dash lever?? May be an adjustment somewhere?? Thoughts?
 
(quoted from post at 10:25:28 02/11/20)
RS piston backup washer R26754
RS piston o-ring R26543
RS piston cover seal R34154

Jim,

I replaced those recommended rock shaft parts and the 3 point will stay up longer, but still falls overnight. Not really a big deal i don't guess. But, now the 3 point won't lower with the dash lever?? May be an adjustment somewhere?? Thoughts?
 

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