Amerequip 8600 Backhoe - Manual (Page 17)

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24.Relief valve setting in backhoe control valve too
low or defective - relief pressure will have to be
checked and corrections made. Backhoe system
pressure is 2400 psi. Relief valve may need
cleaning and overhauling, or entire cartridge must
be replaced. See item 30 at the end.
25.Overload relief valve in the control valve stuck
open or malfunctioning - clean relief carefully but
do not disturb its pressure setting as it cannot be
field calibrated, or replace cartridge. See item 30
at the end.
26.Worn control valve - replace the control valve.