Doosan DX60R Shop Manual page 655

Main Relief Valve (P1, P2, P3)
1. Read value of the pressure gauge in the end of the
cylinder stroke by replacing the spool of the control valve
as 1).
2. Turn adjuster clockwise until required pressure will be
obtained.
17.7MPa/rotation of adjuster rises.
3. When reaching to the specified pressure, press the
adjuster so that it should not rotate and tighten the lock
nut.
Tightening torque: 27.5 ~ 31.4 N•m
4. Increase pressure again and then check that it becomes
specified pressure.
Overload Relief Valve
If set pressure is higher than main relief valve, do not
adjust the overload relief valve but replace both relief
valve and assembly whose setting is completed.
1. Read value of the pressure gauge in the end of the
cylinder stroke by replacing the spool of the control valve
as 1).
2. Turn adjuster clockwise until required pressure will be
obtained.
28.4MPa/rotation of adjuster rises.
3. When reaching to the specified pressure, press the
adjuster so that it should not rotate and tighten the lock
nut.
Tightening torque: 27.5 ~ 31.4 N•m
4. Increase pressure again and then check that it becomes
specified pressure.
Main Control Valve
CAUTION
SP001639
Page 23