Operation and maintenance manual

Section 250-0065
3
SM 2159 7-02
open lines.
7. Remove electrical harness connector from solenoid
(1).
8. Remove bolts (6) and washers (4 & 5) securing two
speed control valve to disc brake oil cooler casing.
Remove two speed control valve from casing.
DISASSEMBLY
Numbers in parentheses refer to Fig. 1.
1. Note location of all hydraulic connectors and
adaptors and remove from valve body (3).
2. Remove knurled nut from end of the centre shaft of
the solenoid. Slide off solenoid coil.
3. Unscrew solenoid cartridge valve (1) from valve
body (3). Extract cartridge valve (1).
4. Remove flow regulator cartridge (2) from valve body
(3).
INSPECTION
Numbers in parentheses refer to Fig. 1.
1. Clean all parts with a suitable solvent and dry with
compressed air.
2. Check ports threads and make sure they are not
damaged or stripped.
3. Check solenoid cartridge valve (1) seat and control
spool. Ensure they are not worn, nicked, cracked or
scored.
4. Check flow regulator cartridge (2) for damage.
Ensure valve seat is not worn, scored or cracked.
It is not recommended that any of the 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 solenoid cartridge (1) and flow
Braking System - Two Speed Control Valve
regulator cartridge (2) valves prior to re-assembly.
2. Install flow regulator cartridge (2) into valve body (3)
and torque to 75 Nm (55 lbf ft).
3. Install solenoid cartridge (1) into valve body (3) and
torque to 30 Nm (22 lbf ft).
4. Install solenoid over cartridge valve (1) centre shaft
and re-tighten knurled nut.
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 two speed control valve to disc brake oil
cooler casing with bolts (6), washers (4) and
lockwashers (5).
2. Remove blanking caps from hydraulic lines and
install lines to the two speed control valve as identified
during 'Removal'.
3. Reconnect electrical harness connector to solenoid
(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 two speed control 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.