Hyundai 35DS-7 Operation Manual page 160

3) MAIN RELIEF VALVE
(1) Pressure setting
A good pressure gauge must be installed in
the line which is in communication with the
work port relief. A load must be applied in a
manner to reach the set pressure of the relief
unit.
Procedure
Loosen lock nut.
Set adjusting nut to desired pressure
setting.
If desired pressure setting cannot be
achieved, add or remove shims as required.
Tighten lock nut.
Retest in similar manner as above.
(2) F F unction
As work port relief
The relief valve is in communication
between the high pressure port HP and
low pressure LP. Oil is admitted through
the hole in poppet C and because of the
differential area between diameters A
and B relief valve poppet D and check
valve poppet K are tightly seated as
shown.
The oil pressure in the high pressure port
HP has reached the setting of the pilot
poppet spring force and unseats the pilot
poppet E and oil flows around the poppet
through the cross drilled holes and to the
low pressure area LP.
6-16
D503HS99
D353HS18
D353HS19