Operation and maintenance manual

Section 210-0045
Cooling System - Low Temperature Unloader Valve
SM 2152 6-02
4
2. Check port threads and make sure they are not
damaged or stripped.
3. Check solenoid valve (1) seat and control spool.
Ensure they are not worn, nicked, cracked or scored.
4. Check relief valve (2) for damage. Ensure relief
valve (2) seat is not worn, nicked, cracked or scored.
5. Examine check valve assembly (3) for any wear or
scoring.
It is not recommended that cartridge assemblies are
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 all seals on cartridge assemblies housed in
low temperature unloader valve prior to re-assembly.
2. Install check valve cartridge (3) into low temperature
unloader valve body and tighten assembly to 85 Nm
(63 lbf ft).
3. Install relief valve cartridge (2) into low temperature
unloader valve body and tighten assembly to 75 Nm
(55 lbf ft).
4. Install solenoid cartridge valve (1) into low
temperature unloader valve body and tighten
assembly to 30 Nm (22 lbf ft).
5. Install hydraulic connectors and adaptors to correct
ports and orientation.
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 low temperature unloader valve to hydraulic
cradle with bolts and lockwashers.
2. Remove blanking caps from hydraulic lines and
install lines to the low temperature unloader valve as
identified during 'Removal'.
3. Re-connect electrical harness connector to solenoid
valve (1).
4. 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.
5. Place the battery master switch in the 'On' position,
start the engine and bring hydraulic oil to operating
temperature.
6. Check low temperature unloader valve and
hydraulic line connections for leaks and tighten as
required.
7. Remove all blocking from road wheels and place
steering lock bar in the 'Stowed' position.
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.
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