Case 580SR Service Manual page 649

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SECTION 35 - HYDRAULIC SYSTEM 59
To adjust all relief valves with the exception of the
loader bucket relief valve remove the valve cap,
loosen locknut and turn adjuster to obtain correct
pressure.
NOTE: relief valves must not be set outside off the
specified range.
Loader bucket relief valve adjustment
NOTE: if the loader bucket circuit relief valve re-
quires adjustment, the special adjusting tool sup-
plied with the test kit is required as described below.
Hold relief valve in vice and using wrench supplied
with tool, unscrew the internal valve assembly from
the valve body.
Screw the internal valve assembly (2) into the body
of the adjusting tool (1).
Install valve into test block and operate hand pump
until valve is pressurized to 170 bar.
Using the special spanner supplied, loosen the lock-
nut on the end of the valve and adjust pressure set-
ting using Allen wrench.
Operate hand pump and recheck pressure.
When pressure setting is correct tighten locknut and
release pressure in circuit using the vent valve on
the hand pump.
Remove the valve and, using a 3/8" 16 UNC screw,
remove the insert. Reassemble the valve and install
it on the test block.
Operate hand pump and recheck pressure.
If pressure is now lower than that recorded with the
insert installed it is an indication that the anti-cavita-
tion feature of the valve is leaking and the valve re-
quires overhaul or replacement.
NOTE: the insert isolates the anti-cavitation feature
of the valve. When reassembling the insert into the
test block ensure it is installed correctly. When cor-
rectly installed the O-ring (3) on the face of the insert
should be visible.