JD 4300 SCV rebuild???

[Egon]

Have you checked the joystick connections or lubed them??

Could there be debris in the control valve?

 

[paulcapasso]

Does the tech manual show how to troubleshoot the problem?

Unfortunately No....

 

[beenthere]

Unfortunately No....

Try the SYSTEM PRESSURE/FLOW TEST
Reason:
To ensure that hydraulic pump pressure and flow are
maintained at sufficient levels for rockshaft and SCV
attachment operation, and to determine if hydraulic
pump is worn.

It is a quote from the tech manual.

 

[beenthere]

Hello Everyone!
So my 430 FEL has been acting weird, not holding height with or without load, and if I have a load in the bucket and pull back about 10-20 percent on the control, the loader drops. Also dumping the bucket sometimes the bucket stops then 3 seconds later it completes the cycle. The tractor has not lost lifting or curling power with the FEL. No weird noises or pulsations, everything else operates smoothly. Has this happened before to anyone? I really doubt the pistons are at fault and no air in the lines... Ideas??

The problem dumping the bucket is typical error of operator due to the regenerative circuit. Causes me fits once in awhile when I dump the bucket wrong.
But don't get the loader arm drop that you mention.
Check your pump out with having the right pressures. Then maybe an adjustment by the book to the SCV relief valves.

 

[DLTTrekkers]

SOUNDS TO ME THAT YOU HAVE A LOOSE SCREW IN THAT CONTROLVALVE . .......REMOVE THE BACK-END AND CHECK .

 

[paulcapasso]

Try the SYSTEM PRESSURE/FLOW TEST
Reason:
To ensure that hydraulic pump pressure and flow are
maintained at sufficient levels for rockshaft and SCV
attachment operation, and to determine if hydraulic
pump is worn.

It is a quote from the tech manual.

I guess I better get a pressure gauge. I didn't see that In the manual but I will go look again.