Operation and maintenance manual

Section 250-0120
SM 2163 7-02
2
damaged or stripped.
3. Check relief valve cartridge (2) for damage. Ensure
valve seat is not worn, scored or cracked.
It is not recommended that the cartridge assembly is
disassembled for maintenance purposes. Ensure that
valve assembly is cleaned prior to removal of any
components and that no contaminant is allowed to
enter the internal galleries.
ASSEMBLY
Numbers in parentheses refer to Fig. 1.
1. Replace seals on relief valve cartridge (2).
2. Install relief valve cartridge (2) into valve body (1)
and torque to 59 Nm (44 lbf ft).
3. Install hydraulic connectors and adaptors to correct
ports and orientations.
INSTALLATION
Numbers in parentheses refer to Fig. 1.
Note: Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
Note: Tighten all hydraulic lines fitted with ORFS
connections, as described in Section 250-0000,
BRAKING SYSTEM SCHEMATIC. Renew all 'O' rings
where used.
1. Secure pressure relief valve to disc brake oil cooler
casing with bolts (5), washers (3) and lockwashers (4).
2. Remove blanking caps from hydraulic lines and
install lines to the pressure relief valve as identified
during removal.
3. Fill hydraulic oil tank with hydraulic oil as specified
in Section 300-0020, LUBRICATION SYSTEM. Refer
to Section 230-0040, HYDRAULIC TANK, for hydraulic
oil levels. Install filler cap on hydraulic tank filler neck.
4. Place the battery master switch in the 'On' position,
start the engine and bring hydraulic oil to operating
temperature.
5. Check pressure relief valve and hydraulic line
connections for leaks and tighten as required.
6. Remove all blocking from road wheels and place
steering lock bar in the 'Stowed' position.
FAULT DIAGNOSIS
Refer to following fault diagnosis chart. As stated
previously, it is not recommended that the cartridge
assembly is disassembled for maintenance purposes.
Ensure that valve assembly is cleaned off prior to
removal of any components and that no contaminant
is allowed to enter the internal galleries.
If investigation shows that the cartridge assembly is in
good clean condition and fit for use, the seals should
be replaced prior to re-assembly. Damage to the
cartridge assembly or valve body would necessitate a
new pressure relief valve assembly.
SPECIAL TOOLS
There are no special tools required for procedures
outlined in this section. Refer to Section 300-0070,
SERVICE TOOLS, for part numbers of general service
tools required. These tools are available from your
dealer.
Braking System - Pressure Relief Valve
FAULT DIAGNOSIS
CONDITION REASON ACTION
Cannot raise pressure. No oil supply. Check triple gear pump. Check hydraulic oil level.
Relief valve sticking. Clean relief valve.
Relief valve spring broken Replace relief valve cartridge.
Circuit pressure too high. Relief valve sticking. Clean relief valve.
Overheating. Relief valve worn. Replace relief valve cartridge.
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