3020 syncro hydraulics

[boberjagel]

Can I run a PTO hydraulic pump off of the front PTO and tee it into the supply line going to the main pump up front so that I can have live hydraulics at the SCV's with the clutch pedal pushed in.

 

[tim s]

Yes,, I have done that on a couple 2440's to keep the loader working

 

[super99]

3020 should have live hydraulics, clutch in or out shouldn't make any difference

 

[Dieseltech]

3020 should have live hydraulics, clutch in or out shouldn't make any difference

Yes it does make a difference on SYNCHRO trans tractors as the rear hydraulic charging pump stops with the clutch pedal pushed down. If tractor is a POWER shift the charging pump does not stop and hydraulic system will keep working.

 

[wore out]

Can I run a PTO hydraulic pump off of the front PTO and tee it into the supply line going to the main pump up front so that I can have live hydraulics at the SCV's with the clutch pedal pushed in.

What's "the Rest of the Story", what are you doing?

If the tractor hydraulics are in good shape with no "internal leaks to sump" and return oil from the loader or whatever accessory you are using is correctly directed to the "front pump charge circuit" the hydraulic system should operate normally for several minutes or more with the clutch depressed

Something must be wrong with the things I mentioned or you are needing the hydraulics to work for a LONG time with the clutch depressed.

More info as to your needs/expectations would be helpful..

 

[boberjagel]

Yes loader work loading manure and snow . We had Deere dealership overhaul transmission pump and flow test front pump and all is well. They suggested run a PTO pump for loader specific on the rear PTO but we want that open for mowers and snow blower. they say this is a very common complaint. I was caught off guard on this having only powershift tractors for 50 years. My bad.

 

[used red MN]

What type of loader is it, are the main frame cylinders double or single acting? Single acting cylinders would definitely aggravate this problem.

 

[Tx Jim]

If you're using scv's to control frt end loader valve then install an ind hyd FEL control valve with return oil routed to rockshaft return oil circuit. Then if FEL boom cylinders are double acting then your problems should be alleviated while traction clutch is disengaged.

 

[Bob Bancroft]

Can I run a PTO hydraulic pump off of the front PTO and tee it into the supply line going to the main pump up front so that I can have live hydraulics at the SCV's with the clutch pedal pushed in.

The front pump in my 2520 synchro is from a 4010, if I remember correctly. This tractor has been retired for a couple of years and I'm tired of it setting around, so it will be sold this coming year. I tried to back in a wagon with it this fall and had an awful time. I was doing a lot of steering, and kept running out of steering! I had to keep stopping, putting it in neutral, and letting it catch up. I don't remember it ever being that bad before.

 

[super99]

Yes it does make a difference on SYNCHRO trans tractors as the rear hydraulic charging pump stops with the clutch pedal pushed down. If tractor is a POWER shift the charging pump does not stop and hydraulic system will keep working.

I guess I'm not too old to learn something new! I've ran a lot of 10 and 2 series Deere's, just not with a loader. For field work, the hydraulics worked whether the clutch was in or out, don't remember ever having to shift to neutral to make the scv work.

 

[Tx Jim]

The front pump in my 2520 synchro is from a 4010, if I remember correctly. This tractor has been retired for a couple of years and I'm tired of it setting around, so it will be sold this coming year. I tried to back in a wagon with it this fall and had an awful time. I was doing a lot of steering, and kept running out of steering! I had to keep stopping, putting it in neutral, and letting it catch up. I don't remember it ever being that bad before.

I'll guess your 2520 has developed a large internal hyd leak which the internal leak causes front pump to not have enough supply oil once clutch pedal is depressed over any extended period of time. Locate & repair the internal leak will help for better power steering.

 

[used red MN]

I guess I'm not too old to learn something new! I've ran a lot of 10 and 2 series Deere's, just not with a loader. For field work, the hydraulics worked whether the clutch was in or out, don't remember ever having to shift to neutral to make the scv work.

On a synchro the transmission pump maintains a reserve of oil in a reservoir above the pump in front of the radiator. The transmission pump stops when you push in the clutch. If enough time passes with that pump stopped that reservoir will empty. This time is shorten by the amount of hydraulic usage and internal leaks that may be present in the system. Generally during normal use and if the tractors hydraulic system is up to par this rarely is encountered.

 

[wore out]

Yes loader work loading manure and snow . We had Deere dealership overhaul transmission pump and flow test front pump and all is well. They suggested run a PTO pump for loader specific on the rear PTO but we want that open for mowers and snow blower. they say this is a very common complaint. I was caught off guard on this having only powershift tractors for 50 years. My bad.

"We had Deere dealership overhaul transmission pump and flow test front pump and all is well." There's a lot more to it for "all to be well", internal leaks to sump from other components can aggravate the problem you are having.

 

[boberjagel]

So yes thanks to all here replying. My loader is a JD 148 so its double acting lift cylinders. And now that its been mentioned I also struggle hooking up my bush hog to the 3 point. By the time I get close to lining up to the quick hitch I run out of steering and 3 point lift and have to shift to neutral as you've stated above and recharge system. Why didn't Deere just use the same setup in the rearend as the powershift tractors??

 

[Scott 730]

So yes thanks to all here replying. My loader is a JD 148 so its double acting lift cylinders. And now that its been mentioned I also struggle hooking up my bush hog to the 3 point. By the time I get close to lining up to the quick hitch I run out of steering and 3 point lift and have to shift to neutral as you've stated above and recharge system. Why didn't Deere just use the same setup in the rearend as the powershift tractors??

You likely have a large leak to sump somewhere in the system as has been stated above. No amount of McGyvering added on pumps is going to solve that. Band aid fix at best.

 

[wore out]

So yes thanks to all here replying. My loader is a JD 148 so its double acting lift cylinders. And now that its been mentioned I also struggle hooking up my bush hog to the 3 point. By the time I get close to lining up to the quick hitch I run out of steering and 3 point lift and have to shift to neutral as you've stated above and recharge system. Why didn't Deere just use the same setup in the rearend as the powershift tractors??

Something is wrong with your tractor, while the hydraulic system is not as good as the powershift version it should be working much better than it is.

Ex-poster here, svCummins, chased an issue like yours for a long time and it turned out to be an O-ring sealing a cover in the return circuit, under the 3-point cover had blown out.

I suspect you have some sort of internal "leak to sump", as well.

 

[Scott 730]

Something is wrong with your tractor, while the hydraulic system is not as good as the powershift version it should be working much better than it is.

Ex-poster here, svCummins, chased an issue like yours for a long time and it turned out to be an O-ring sealing a cover in the return circuit, under the 3-point cover had blown out.

I suspect you have some sort of internal "leak to sump", as well.

I believe SV actually had a cracked cover IIRC.

 

[matthies]

I would check the pto valve, they have a lot of age on them and develop an internal leak causing your issue also. So slide the clutch side lower cowl back and feel the temp of the valve after a few minutes of run time if it is warmer than your scv's or 3 pt housing, or if the other valves feel warmer they can also be your problem. The pto would have to be replaced and a lot of $$.

 

[Tx Jim]

I would check the pto valve,

If this 3020 serial # happens to be below 123,000 it will not have a pto control valve

 

[boberjagel]

Yep tractor is a late 72 serial number and Deere addressed the PTO concern by replacement of several parts and transmission supply pump... $ 18000 later all I got was no more loader chatter. Shop foreman said even with this bill he massaged a lot off. I tried for more but he was between a rock and hard spot too... They hear the same story everyday.