Kobelco sk300 1997, hidraulic trouble

[rugalde_cr]

Hi, I need some help , three troubles:
1- Both PUMP are 700 psi loaded at neutral in FC, S and H modes, but perfect at D mode.
2- ANY combined movements between BUCKET and BOOM can be performed.
3- RL TRAVEL is a little slow only in a single travel operation.

In D mode, both pumps work fine, and in neutral is 0 PSI **

Questions:

There is a relation between these troubles?
There is a procedure to check and Adjust the pressures of the different relief valves at control valve . I have the shop manual, but all I can find is a table of the pressure of the different circuits to be adjusted at the regulator but not about relief pressures.
Comments are welcome and very appreciate.

Regards

Tiko

 

[rugalde_cr]

First Thing, somebody know what is happening about 700 psi at H, S & FC modes? I thing is about main relief valve or something with the negative control pressure.