8070 2wd: Weak/No steering below 1500 RPM

Hey all,

Looking to buy a 8070 2wd Allis that seems to run and drive good... as long as you are above 1500 RPM. Below that it will not steer.

What is the worst case scenario?

Best case scenario?

The price is under 10K by a decent margin, hence the interest. :)

Its a powershiftif that affects the diagnosis.

Any info appreciated,
Thanks!

Gleaner: the properly engineered and built combine.

If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help.

Left hand differential filter and screen would be an easy check and fix if there was something wrong. The gear pump for the steering would probably be the most expensive, although it's not that hard to replace. Always be sure that the front end is not binding in the spindles.

Lynn Marshall wrote:

Left hand differential filter and screen would be an easy check and fix if there was something wrong. The gear pump for the steering would probably be the most expensive, although it's not that hard to replace. Always be sure that the front end is not binding in the spindles.

Gear pump is in the main pump stack, correct? If its same as 7000 series shouldnt be terrible to find a used one.

Gleaner: the properly engineered and built combine.

If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help.

Th gear pump is in the pump stack as you call it. You have to remove the piston pump first and then take out the gear pump with the gerotor pump attached. Once you have the gerotor section removed , then you can disassemble the gear pump. The 7000 series pumps would work although there have been improvements to them over the years ,so a later model would be best. Like Mack says, getting a good one is a bit of a crap shoot. If I get one from salvage, I always take it apart before I leave to make sure that it's better than what I have. 8000 series pumps for me have been pretty trouble free for me. I would try and be sure that other areas are problem free before I suspected the pump.

Edited by Lynn Marshall - 05 Oct 2020 at 10:06pm

I don't care how "good" the hydraulic shop is....if they can't get the parts to repair it, it remains junk. That dual pump is an OEM spec'd pump that fits nothing else.

I had a pump for the 540 wheel loader, which is proprietory to AC, done by Precision in OKC. Price was reasonable.

Curt Anderson
HD3, HD5B, HD6AG,HD6B dozer, I-400,615, 616,620,720,ACP25 lift truck, 1956 D Grader, AC 540 loader, AC #84 plow, Simplicity tractors, Agco MT225, Agco 2025,

Tell me where it is. I'll buy it and get it fixed. Then, maybe I can sell it to you >> Sounds like a plan to me...

If you don’t bite on it give me contact info I might.

8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760

That pump not only provides oil for steering, the excess volume is used to LUBRICATE the driveline. Get it fixed. Not telling you twice.

Hey guys,

I'm finally opening Pandoras box here, Tractor has sat since I bought it, me fearing the worst about potential damage.

Pulled the cap off and Mack was right, no orfice. I assume that is quite important? :)

According to the Agco parts book site, I am missing both #34 PN 70265406 (orfice) and #35 PN 70269666 washer both go on either end of the spring. how important is that washer?

I assume the orfice is the same diameter as the spring and fits inside the spool?

Spring looks good. cap has two shims in it.

Since we might be dealing with a sloppy mechanic from years ago, I better ask, is the long end of the spool supposed to go down or up? Currently long end down.

As far as the spool, there is zero roughness, feels smooth as glass. it did want to fight coming out though, I had to hook a center hole with an o-ring pick and pull. I think what fought was there was a few chunks of hard plastic wedged in 2 of the 4 holes. any ideas what the plastic might be?

Once the spool is in there, you can turn it with a finger. Do I need to sand it, or is it fine?

Also, the only time i drove it since buying it was 500 feet from where it was unloaded to where I am working on it, and it did sound like a pump was straining a little, is that from the missing orfice? Regardless I think I better drop out the left filter to see what everything looks like.

Any info appreciated,
Thanks!

Gleaner: the properly engineered and built combine.

If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help.

Thanks for the pics Lynn, very helpful!

So just to confirm, the 70269666 Washer is identical in every dimension to 70265391 Shim, except for thickness? If yes, then you have Qty 1) 70269666 Washer and Qty 2) 70265391 shims in your pic, correct?

What would be the reasoning to add an extra? what about taking it away entirely?

My 8070 has 2 thin shims, the 7040 that donated the orfice has two thick and 5 thin under the cap. I doubt either is correct.

The 7020 I checked had 2 thick 1 thin, the 7050 has 2 thick 2 thin.

Would it be best to default to the 1 thick 2 thin and see how it operates?

Thanks for the help!

Edited by GM Guy - 14 Jun 2022 at 9:19pm

Gleaner: the properly engineered and built combine.

If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help.

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