NorAM 65E Turbo, Руководство по обслуживанию, Страница: 523 / 613

65E Turbo Motor Grader
Service Manual
Section 7
Hydraulics
Service 1.00_2006.03 7-42
If the check valve cartridge does not seem to be function-
ing properly, it is usually the result of foreign material
lodged between the piston, 11, and relief valve
poppets, 12, 15. It can be disassembled for cleaning.
Always clean the surrounding area before removing the
complete relief valve cartridge.
The pilot section, 1 through 10, can be removed from the
cartridge housing without disturbing the adjusting
screw, 2, and pressure setting. Once removed, separate
the parts and examine for foreign material. Examine O-
rings and back-up washers for damage. All seats and
seating surfaces should be smooth and free of nicks,
scratches or grooves.
After inspecting and cleaning, immerse all parts in
hydraulic oil and assemble.
If operating difficulties indicate a problem in the pilot pop-
pet, 5, it can be removed and cleaned. If the pilot poppet
is removed, the pressure will require adjustment when
reassembled. To adjust, refer to section on PRESSURE
SETTINGS, MAIN RELIEF VALVE.
To access the pilot poppet, 5, loosen lock nut, 1, and
unscrew the adjusting screw, 2.
When installing the check valve cartridge in the control
valve, torque to 40-50 Nm (30-37 Ib-ft).
* Part of Seal Kit
(1) Nut, Lock (9) O-Ring*
(2) Screw, Adjusting (10) Spring
(3) O-Ring* (11) Piston
(4) Spring (12) Poppet
(5) Poppet, Pilot (13) O-Ring*
(6) Housing, Pilot (14) Ring, Backup*
(7) O-Ring* (15) Poppet
(8) Ring, Backup (16) Cap
(17) O-Ring*