John Deere 310 A hydraulics quit!

[medic0648]

It took me a while before we figured it out. We were about to split the tractor when for some reason we decided to pull the return line and start the tractor. It could also be the bh valves also. Mine failed when I was driving. Another easy way to test is pull the line out on the priority valve and put a pressure gauge on its place and test the steering/shifting. If it works reconnect the loader/backhoe seperately and see which causes the symptoms. If still having issues it's likely the charge pump and you need a service manual to verify with testing procedures.

 

[Tx Jim]

The 301 and 310 are based on the jd 1020 ag tractor and share most of the test procedures and psi ranges.

At dealership that I worked at when 1020's were sold new very few 1020's had the same hyd options as their industrial counterparts(IE no hyd reverser or backhoe connections) therefore the diagnostics are different for most ag vs ind models.

 

[medic0648]

That's why I limited it to MOST test procedures and psi ranges. Like testing the charge and main pump is amost identical. The best way is with the correct service manual for the exact testing procedures provided people haven't changed things on the equipment.

 

[Tx Jim]

No pto , it has a permanent backhoe

Then you'll need to ascertain if traction clutch is holding. The only way I know of is to remove the shift cover I referred to in my earlier post. If a hyd control valve is causing the problem you can disconnect the return hose of each control valve(FEL & BH),start engine and if oil flows out return hose with all control levers in neutral then that valve is the problem.

 

[Tx Jim]

That's why I limited it to MOST test procedures and psi ranges. Like testing the charge and main pump is amost identical. The best way is with the correct service manual for the exact testing procedures provided people haven't changed things on the equipment.

I agree that a JD tech manual is needed. I disagree that testing the charge & main pump is almost identical.

 

[Johnpaul]

I sure appreciate all of you for this info. I'm not able to work on the ol' girl all day because I work full time and we are building a house. Terrible time for her to quit on me but I do have some people to help me with all this pressure checking. Again , thank you so much...will y'all posted with the progress.

 

[Jerry capobianco]

I'm a new member and have 310b john deere and have the same problem no HYD. I was wondering what you did to repair yours.

 

[Tx Jim]

I'm a new member and have 310b john deere and have the same problem no HYD. I was wondering what you did to repair yours.

How long since hyd filters were changed and sump screen cleaned? Also check to be sure frt hyd coupler isn't stripped out.

 

[Jerry capobianco]

The filters have been changed and a new main pump has been installed by some one other than myself. I don't know if that spline was checked when the new pump was installed. Is there a way to check that spline with out taking the pump off?
Thank you for responding so quickly

 

[J_J]

Remove the other end ofpump hose and place in a bucket and turn the engine over for a few seconds.

If no flow, either the shaft coupler is messed up or you have lost prime.

 

[Tx Jim]

Jerry capobianco
Since the pump has been recently replaced I doubt the drive coupler is the culprit. A high % of pumps are unnecessarily replaced. If sump screen(parts key #9) hasn't been cleaned lately I'd highly recommend it. Filter relief valve(parts key #3) could also not be seating. Have you tried checking stand-by psi?

 

[Jerry capobianco]

No I haven't checked any pressures yet. The machine is in the woods while we were digging a hole it died with the bucket in the hole and it getting cold up so I think we're going to have to wait for spring.we got it all covered up for the winter

 

[Jerry capobianco]

What kind of Gages and fitting would I need to do this pressure test. I could locate them over the winter.

 

[Tx Jim]

You'll need a 3000 & 300 psi gauges available from Surplus Center for under $25.

 

[J_J]

Make up something like these and for a permanent installation, just install the hyd gage in a tee in the IN port of the first valve and mount where you can see it. Then use it for monitoring and troubleshoting.

 

[Jerry capobianco]

I don't think I mentioned that when it was running no hyd and it would not go forward or reverse.
Is there a web site to bring up the hyd system or do I have to buy a manual for a 310B JD. I am greatful for all the info. I'm some what mechanical but not to much on heavy equip but I'm going to give it a shot the machine is in to good a shape
Thanks jerry

 

[Tx Jim]

No forward or reverse indicates trans pump pressure &/or flow because the reverser operates from trans pump output.

 

[Jerry capobianco]

Does that mean that machine has to be split? To get to that pump?

 

[Tx Jim]

1st thing to do is diagnose to determine why trans pump psi isn't getting to reverser BUT yes tractor must be split to R&R trans pump.

 

[Willie B]

It has been a while, memory is somewhat foggy. I sold the manuals with the 410. John deer has a closed center system. If no valve is open asking anything to work oil should not flow at all. pressure builds to a point where pump piston springs aren't strong enough to move pistons back to center in the radial pump. Pistons go "out of stroke" keeping pressure constant. There is no engine disconnect clutch, the "Cam" in the pump continues to rotate, but since pistons don't return to center, they aren't pushed outboard by the cam.

In my case oil leaked past the backhoe valve relieving pressure. There is a priority valve. If pressure falls below a certain level, other functions turn off directing all flow to steering.

Forward uses pump pressure for a clutch reverse uses it for a brake on a gear providing reverse.

Low oil, foamy oil, (the wrong hydraulic fluid), closed center valves leaking oil to the reservois or other pump failures could cause your symptoms. Can you steer?

Those of us who own older yellow Deeres with hydraulic issues won't suffer much shock when we get to ****.