Front-End Loader Kubota TL 720 4-in-1 bucket issue

[irontrack]

Just finished reassembling a TL 720 Loader to the L35, which has a WR Long 4-in1 bucket. Never had it operating. Resealed cylinders and attempted to open-close but only shudders a little. Increased throttle, and opens a little more. WR Long said they did not sell the single spool valve that was installed in this unit, so a dealer most likely put it in. Flow seems good, but do not know how to check pressure on the circuit. Is there a separate relief valve for this auxiliary circuit?

 

[J_J]

Each valve in an open center system should have a relief if it is a lever valve.

If the control for the 4in1 is 3rd function , you probably do not have a relief valve for that circuit. and then it would rely on the loader relief valve.

Install a hyd gage in a tee in the IN port of the loader valve.

If the loader valve is fully operated, you will have no fluid for the other circuit.

Either operate the loader or the 4in1, or use only half lever for the loader and that will allow half flow to the 4in1.

If using 4in1 only, then you will read the pressure developed by the 4in1 valve cyl.

Set all relief valves the same.

This kind of valve can be used with grapple or a 4 in1, and has a relief.

Show pic of your 4in1 valve.