Hydraulics don't work after bleeding

ms_ben

New User
I am having some some trouble with my hydraulics and I couldn't find quite the same situation in the archives. I have a ford 3400, but I think it might have had a 3000 rear switched in with a pto, since it has a pto when the serial said it shouldn't.

Anyway, I can't get the 3 pt to lift. It used to work until I ran low on fluid. Occasionally I had to rev it to get it the lift to work but then it would work great. Then I drained to replace some seals and now it wont lift.

When I hook a hose to the bleeder on the pump and send it back to the fill hole I get a bunch of fluid and no bubbles, so I think my suction side and pump is ok.

When I open the test port I get nothing. If I fill test port with fluid it fills quickly then drains. I see no visible leaks on the high pressure line.

Any ideas? I figure I need to pull the top cover but I have no idea what I am doing under there and was hoping my symptoms might point to something to somebody with more knowledge.

Thanks
 
"Replaced some seals"? What seals? How long since it last functioned properly? What are you calling the 'test port'? If you are referring to the top cover accessory connection port, that is not pump output.
 
Sorry for the confusion. I replaced the brake cross shaft seals and axle seals. That is what cause my fluid to run low in the first place.

It last functioned about a month ago.

By "test port" I mean the big bolt right on top between your legs if you look down while in the seat. I believe I read on this forum that is where you can check the pump pressure with a gauge.

It is number 14 on this diagram (part # 371433S36):
http://partstore.agriculture.newholland.com/us/parts-search.html#epc::mr67519ar322610bi1854080-14

If that isn't supposed to have any pressure, then I guess that part is unrelated.

Thanks
 
Sometimes it takes a while to get all the air out. If it looks like solid fluid in the hose shut the engine off and see what's in there when the flow stops.
 
(quoted from post at 23:01:27 07/06/18) Sorry for the confusion. I replaced the brake cross shaft seals and axle seals. That is what cause my fluid to run low in the first place.

It last functioned about a month ago.

By "test port" I mean the big bolt right on top between your legs if you look down while in the seat. I believe I read on this forum that is where you can check the pump pressure with a gauge.

It is number 14 on this diagram (part # 371433S36):
http://partstore.agriculture.newholland.com/us/parts-search.html#epc::mr67519ar322610bi1854080-14

If that isn't supposed to have any pressure, then I guess that part is unrelated.

Thanks
ressure there will only be the pressure in the lift cylinder, which will be relative to the weight being lifted. 300#=not much, 1200#= a lot more pressure. Nothing at all, but pump working sounds like the unloader valve stuck in the 'dump to sump' position. Sitting unused contributes to stuck problem. All too common in these Ford systems.
 
That makes sense about the "test port". I guess my next step is to take the cover off the rear end and see if I can unstick the unloader valve. Is it typical to just be able to break the valve free and then use the tractor enough that is doesn't stick, or do you normal need to replace the o-ring, or something more?

My old fluid seemed thicker than the new stuff, I imagine that cannot have helped.

Thanks,
Ben
 
I got it apart today. The unload valve felt like it was a little tight with the o-ring on and then slide a lot better with the o-ring off. It also was positioned toward the plug, which is the neutral position. When I slide it forward by hand then applied air to the high pressure side the cylinder raised, so I fell pretty confident that is the problem.

The part number is 9626944. Does anybody know if the kit from the store has that o-ring?

http://www.yesterdaystractors.com/Ford-3000_Hydraulic-Lift-Cover-Repair-Kit_LCRK65UP.html

Thanks,
Ben
 
I have a ford 3400, but I think it might have had a 3000 rear switched in with a pto, since it has a pto when the serial said it shouldn't.

The serial number doesn't tell you whether it has a PTO or not. What is the model number? Most Ford tractors can't just have PTO added by swapping the rear end. There are usually parts that need to be added inside the transmission as well.
 
(quoted from post at 19:15:34 07/08/18)

The serial number doesn't tell you whether it has a PTO or not. What is the model number?

It is C5011k. What I found was C=3k 50=Industrial 1=Diesel 1=no pto k=6/4 trans.

Everything seems right but the PTO.
 
C5011K is actually a 3500, not a 3400. C50 does equal 3000 series Industrial, which is a 3500 or in later years the 3550. The 3400 was actually a "Utility" model, not an Industrial. The rest of your interpretation of the model number is correct, it left the factory with a diesel engine, no PTO and a 6x4 manual reversing transmission.

Does it still have the 6x4 revering transmission? And also, where are you reading the model number from, is the number stamped into the flat spot on the bell housing or is it in the foil sticker on the under side of the right side hood panel, or both?

As I said, I am pretty sure that if a PTO was added later then more than just a rear end swap was done. There had to be additional pieces added inside the transmission itself.
 
(quoted from post at 21:30:46 07/08/18) C5011K is actually a 3500, not a 3400. C50 does equal 3000 series Industrial, which is a 3500 or in later years the 3550. The 3400 was actually a "Utility" model, not an Industrial. The rest of your interpretation of the model number is correct, it left the factory with a diesel engine, no PTO and a 6x4 manual reversing transmission.

Does it still have the 6x4 revering transmission? And also, where are you reading the model number from, is the number stamped into the flat spot on the bell housing or is it in the foil sticker on the under side of the right side hood panel, or both?

As I said, I am pretty sure that if a PTO was added later then more than just a rear end swap was done. There had to be additional pieces added inside the transmission itself.

The numbers match on the hood and bell housing and it still has 6x4. Good to know it is a 3500, I didn't realize there was a difference.

And I have no idea about the PTO. The rear end looks like a 3000 with no flow control and no diff lock. Maybe they swapped in a new rear and trans, and the trans just happened to be the same.
 
I believe that a 3000 rear end actually would have a flow control valve. I am pretty sure that it was only the 3 cylinder 2000's that did not have one. Maybe a 2000 rear end was swapped in along with the necessary parts inside the transmission to get the PTO, or maybe not. Does the PTO actually work?
 
(quoted from post at 11:14:36 07/09/18) I believe that a 3000 rear end actually would have a flow control valve. I am pretty sure that it was only the 3 cylinder 2000's that did not have one. Maybe a 2000 rear end was swapped in along with the necessary parts inside the transmission to get the PTO, or maybe not. Does the PTO actually work?

PTO works great, and it could be a 2000 rear, makes as much sense as anything else.
 

Got the parts in and put it back together, works great! I used a dealer o-ring. Thanks for the help, it would have taken me a lot longer to figure out if I didn't know to look at the unloader first.
 
(quoted from post at 09:21:36 07/13/18)
Got the parts in and put it back together, works great! I used a dealer o-ring. Thanks for the help, it would have taken me a lot longer to figure out if I didn't know to look at the unloader first.
ou are welcome. Glad I could be of help.
 

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