JD 1530 _ FEL & 3pt issue

[cjburke42]

I have a JD 1530 that was inherited. It had a 48 series FEL [front end loader], but has never worked.
I am trying to get it functional before hay season arrives in TN.
Currently the 3pt works great no matter how heavy the attachment is. When I connect the lines to the FEL (supply line tees into line after the pressure control valve, return is plumbed into transmission housing top right above ankle.) The FEL shutters to raise and if any attachment is on the 3pt it fails to raise unless I max out a cylinder on the FEL and hold it (bucket or arms).
I also have a ported filter cover coming next week to see if this helps any at all. Just having a hard time processing what could be causing the 3pt issues after the FEL is attached.
I will 1st try removing the FEL valve return hose from tractor & with both FEL hyd control levers in neutral and see if any fluid comes out.

 

[Zebrafive]

Does the loader have any quick couplers? If so check they are properly coupled.
Other things to check:
Oil level
Sump screen
Transmission filter
Filter bypass valve (might be stuck open)

 

[rScotty]

I have a JD 1530 that was inherited. It had a 48 series FEL [front end loader], but has never worked.
I am trying to get it functional before hay season arrives in TN.
Currently the 3pt works great no matter how heavy the attachment is. When I connect the lines to the FEL (supply line tees into line after the pressure control valve, return is plumbed into transmission housing top right above ankle.) The FEL shutters to raise and if any attachment is on the 3pt it fails to raise unless I max out a cylinder on the FEL and hold it (bucket or arms).
I also have a ported filter cover coming next week to see if this helps any at all. Just having a hard time processing what could be causing the 3pt issues after the FEL is attached.
I will 1st try removing the FEL valve return hose from tractor & with both FEL hyd control levers in neutral and see if any fluid comes out.

How do you know that the 48 loader and control valves all work? Did it ever work with your 1530? Or is it untested?
If hooking it up like you describe causes the 3pt not to work unless the loader is stalled, that's a pretty good clue.

My best guess from what you are saying is that the 48 loader control valve isn't set up with the proper internal plug for use with a closed center hydraulic system like the 1530s have. You may be able to buy a plug, but if not you may have to buy a 2 spool loader control valve that has the convertible plug for closed center operation. That would be the first place I would look. Especially if the 48 loader came off another tractor that might have had open center hydraulics.

You can get an idea of 2 spool directional control valve prices at surpluscenter.com/hydraulics/

Good luck with the haying. Does your 1530 have the optional power steering - I hope?

rScotty

 

[cjburke42]

It does have PS. Before I got this deep into it, I took the valve off to the local hydraulic shop and told them something was not right so they applied 3000psi and tested it and said it is functional maybe my lines were hooked up backwards. From there went back home and double checked line connections and still have an issue. Guess I could have told them it is closed center if I knew tht back then

 

[cjburke42]

Does the loader have any quick couplers? If so check they are properly coupled.
Other things to check:
Oil level
Sump screen
Transmission filter
Filter bypass valve (might be stuck open)

Ok I'll check the bypass valve tomorrow

 

[rScotty]

It does have PS. Before I got this deep into it, I took the valve off to the local hydraulic shop and told them something was not right so they applied 3000psi and tested it and said it is functional maybe my lines were hooked up backwards. From there went back home and double checked line connections and still have an issue. Guess I could have told them it is closed center if I knew tht back then

They would have known if the valve was open or closed center type when they put it on their flow stand. But they might not have said anything because the way flow stands work the valve is going to test the same either way.

"Open" versus "Closed" systems mean just what they say, i.e, in neutral center position the Open system control valve is normally open to allow flow directly back to the reservoir because the constant displacement hydraulic pump is always putting out the same flow and pressure and the constant flow just goes around in a circle from pump to valve to reservoir back to the pump until you block the flow and divert some of the blocked flow to do something like work a cylinder.

Or in the case of a closed center system the control valve blocks the flow when it is positioned in the neutral center position. In that case the return goes to the accumulator rather than back to the reservoir. As the accumulator becomes charged up, it sends a signal to the variable displacement hydraulic pump to reduce flow and pressure. The closed system only pumps more fluid when it sees a drop in the pressure of the stored fluid in the accumulator.

Are you sure that when your loader valve is plumbed right internally and hooked up to allow the accumulator circuit to build pressure? And not just returning straight back to the reservoir?
rScotty

 

[cjburke42]

Fluid does come out of the return hose when I start the tractor with the control valves in neutral position. Looks like I am set up on open center

 

[rScotty]

Fluid does come out of the return hose when I start the tractor with the control valves in neutral position. Looks like I am set up on open center

OK, either that or else the accumulator isn't charged up. You may want to check your plumbing against a hydraulic schematic.

But with any luck you have now found the problem. It will be nice if the fix turns out to be as simple as making a change to the FEL control valve.
Next step is to determine the manufacturer of the FEL control valve and see if they make a closed center conversion plug for it.
rScotty

 

[Tx Jim]

Fluid does come out of the return hose when I start the tractor with the control valves in neutral position. Looks like I am set up on open center

If your control valve resembles valve in photo check for failed seal(item 10).

I still remember locating that same seal that had failed on a tractor with a model 48 loader that I was attempting to diagnose a hyd problem about 50 yrs ago

 

[Tx Jim]

OK, either that or else the accumulator isn't charged up. You may want to check your plumbing against a hydraulic schematic.
rScotty

There is no factory hyd oil accumulator on a JD 1530 hyd system to become discharged.