I have a JD 4310 EHydro with steering, movement and PTO issues. I have replace the fluid and filter and cleaned the screen. Replaced the manifold on the pump. Lifts work but the three things operated by pump LVA11451 are not working. Is there any way to check to see if the pump is working or should it just be replaced. I do not have any gauges to check pressure.
John Deere Hydraulics
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rScotty
Super Member
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- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
Often when nothing works it is because the pump is not getting pure fluid. It has to suck the fluid from the sump, and if there is the slightest air leak in the hose from sump to filter to pump then the fluid gets frothy and nothing works right..
You might want to renew all those suction hose connections between sump and pump..
It is very rare for a pump not to work, but running a pump with air mixed in with the hydraulc fluid will eventually do it.
I'm curious why replace the manifold on the pump? Did it accomplish anything?
Amazon sells pressure testing kits with gauges.
You might want to renew all those suction hose connections between sump and pump..
It is very rare for a pump not to work, but running a pump with air mixed in with the hydraulc fluid will eventually do it.
I'm curious why replace the manifold on the pump? Did it accomplish anything?
Amazon sells pressure testing kits with gauges.
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I replaced the manifold because that is where I was told most leaks occur. This is the F manifold that connects to both pumps.
I loosened the connections on the bottom of the pump but it did not leak fluid when I started the tractor I loosened the connection on top where the manifold connects and fluid does come out of the manifold. Still not sure it is getting into the pump though.
I loosened the connections on the bottom of the pump but it did not leak fluid when I started the tractor I loosened the connection on top where the manifold connects and fluid does come out of the manifold. Still not sure it is getting into the pump though.
rScotty
Super Member
- Joined
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- Messages
- 9,450
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- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
The common manifold problem is probably an air leak. Without gauges to test the output of the pump, we can only work on the suction to the pump.... and without gauges we don't know if we are getting anywhere. About all we can do is loosen a fitting and see if oil comes out.
It will be slow picking at it without a pressure gauge. The pressure gauge kits have the adapters in the kit so all you have to do is taie a fittng off insert the adapter and plug in the gauge. Prices on the kits run 50 to 200 bucks. Less than a mechanic charges.
But we can try to guess. Which lift is working? What 3 things are not? What is the history - how did this all start? Is the HST working?
Do you have a shop manual with a hydraulic flow schematics.
BTW, most hydraulic problems are easy to fix once you find them. I wouldn't start throwing parts at it.
rScotty
I will see what I can find as far as gauges are concerned.
The front lift and the back lift be both work. The power steering, PTO and the ehydro pedals won’t move forward or reverse. The only code I get is a long, short, short, long
The front lift and the back lift be both work. The power steering, PTO and the ehydro pedals won’t move forward or reverse. The only code I get is a long, short, short, long
Harry in Ky
Veteran Member
I'm no authority on that tractor but what you described says only one of the two pumps is working. The lift and hydraulics will be one pump. The other pump will supply steering, transmission (charge) and PTO clutch operating pressure. You need to look and see which pump is which, and determine if the steering pump is working at all. You don't need gauges just figure out that a pump isn't moving any oil. Loosen the line nut on the steering pump, start the tractor, and see if any oil is spilling out of the loose fitting. Simple starting point.
kennyd
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We sell gauges that are built and ready to use.
What did the old oil look like when you removed it?
What did the old oil look like when you removed it?
oldnslo
Super Member
What type of drive coupling or connection is between the front and rear pump. Just curious if that could have failed so the rear pump is not turning.
Harry in Ky
Veteran Member
Exactly. What I would do next is simply remove the steering pump completely for further examination. Either the pump is completely toast or something's broken and the pump isn't even turning.
