Weak SCV

Hi All,

Hoping everyone in the midwest got their hay in before all this weather! Nothing better than racking small squares when it's 100F and 90% humidity to beat a coming storm! We racked 200 bales and then rounded the rest.

I've got a 3020 with a 48 loader. While shuttling big rounds with a bucket bale tine yesterday I noticed the FEL was really lacking. Bucket curl will lift tractor, no problem, though.

Got up this morning after thinking about it, and, decided to swap which set of SCV's the loader is going into--went from the right set (from rear of tractor) to the left hand side--massive improvement. No problems.

So; more details.

3020 Diesel, powerjerk, while troubleshooting this: https://forums.yesterdaystractors.com/viewtopic.php?t=1436581&highlight=

I drained the hydraulic fluid, replaced both filters and checke the screen (no material in screen, filters looked fine, hyd oil looked fine--replaced with new hydraulic fluid).

My boot fix on the steering cylinder line is still in place (if it's 100F outside, inside the barn is much warmer..waiting for fall to replace the hard line.)

Where should I start checking to see why just one set of SCV's are NFG?
I don't have a flow meter, but, I can, and intend to build an pressure gauge today or tomorrow.

Thanks all,

Joe

If it were mine I would simply plumb the loader direct and not use either scv to operate it. You already must have an independent valve if you could still use the loader by changing sides. It has been posted on here before what fitting to get and where to tap into the tractor hyd's to not use the scv's. Tom

I agree with Tom for better hyd flow. Next thing I'd do is get a dedicated bale spear attachment & discard the bucket spear so The bale would be easier to lift & bale visibility would be much better.

On subject of 1 scv hyd pressure vs other scv the hyd pressures should be equal but due to difference in wear of rockers//rollers of each scv the poppet valves probably aren't opening up the same amount on both scv's

As previously stated . Connect the loader direct for speed and drive .
Oil must be returned one way or another to the area between the transmission pump outlet and the oil filter inlet .
Do not return the loader oil direct into the transmission case like some amateurs attempt to do .

I would concur with others, much quicker and better just to plumb direct.

Good fall project.

(quoted from post at 09:46:05 07/19/20)
I agree with Tom for better hyd flow. Next thing I'd do is get a dedicated bale spear attachment & discard the bucket spear so The bale would be easier to lift & bale visibility would be much better.

On subject of 1 scv hyd pressure vs other scv the hyd pressures should be equal but due to difference in wear of rockers//rollers of each scv the poppet valves probably aren't opening up the same amount on both scv's

Click to expand...

Thanks guys; I actually tend to take the loader off for long periods as I don't always need it, so having it on the SCV's is kinda handy that way. Spear is only for either stacking rounds, or, getting them on my bale trailer, which I also do pretty infrequently; normally I just use a 3pt bale mover. Yesterday I was trying to get everything in before rain and the 3pt had a post driver on it so it was quicker to just put the spear on.

This is a new occurrence, had previously been OK; so is this a rebuild of the breakaways or of the SCV? From searching the forums, the SCV rebuild and adjust appears to be better done by somebody who has done it before, correct?

Thanks,

J

The direct connection of the hydraulics still uses the quick connect fittings .
This Dubuque/Mannheim image is the same but different as the direct connection on your Waterloo 3020 .
Somebody will post the Waterloo connection images soon .
Connect and disconnect are just as quick as hoses on the SCV .

Start by reading the manual and and the powershift transmission so it
doesn’t jerk

Adjust the shift valve for smother shifting

You are likely needing to overhaul the SCV. To test, adapt a 3000 psi gauge to a hose tip and insert into coupler of suspect SCV.
Move your control lever to get about 1500 psi on the gauge. Without touching the control watch the gauge for change. within one
minute. A difference in pressure (up or down) indicates a leak in the valve. They are not a terrible thing to repair with the
right tools and some experience. I estimate I have done 4-500 over the years

(quoted from post at 11:49:43 07/19/20)
The direct connection of the hydraulics still uses the quick connect fittings .
This Dubuque/Mannheim image is the same but different as the direct connection on your Waterloo 3020 .
Somebody will post the Waterloo connection images soon .
Connect and disconnect are just as quick as hoses on the SCV .

Click to expand...

This appears to capture the points for something like mine:
https://www.instructables.com/id/Early-John-Deere-3020-Powershift-Front-End-Loader-/

I don't see that he QD's them, but, I would.

Appears this is a good series of photos from Jim on where to tap, too.

https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=jd&th=475508

(quoted from post at 07:22:55 07/21/20)
Appears this is a good series of photos from Jim on where to tap, too.

https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=jd&th=475508

Click to expand...

Yes you're correct I've posted those photos so many times my submit button has no printing left on it. LOL