Operation and maintenance manual

Section 250-0045
3
SM 2162 8-02
connections, as described in Section 250-0000,
BRAKING SYSTEM SCHEMATIC. Renew all 'O' rings
where used.
1. Secure motor/triple pump (1) assembly to brackets
with mounting hardware as removed at 'Removal'.
2. Remove blanking caps from hydraulic lines and
install lines to motor/triple pump as identified during
'Removal'.
3. Fill brake coolant tank with oil as specified in
Section 300-0020, LUBRICATION SYSTEM. Refer to
Section 250-0025, BRAKE COOLANT TANK, for oil
levels. Install filler cap on brake coolant tank filler
neck.
4. Fill hydraulic tank with hydraulic oil as specified in
Section 300-0020, LUBRICATION SYSTEM. Refer to
Section 230-0040, HYDRAULIC TANK, for 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 motor/triple pump (1) and hydraulic line
connections for leaks and tighten as required.
Braking System - Motor/Triple Pump Assembly
7. Remove all blocking from road wheels and place
steering lock bar in the 'Stowed' position.
FAULT DIAGNOSIS
Numbers in parenthesis refer to Fig. 1.
Refer to following fault diagnosis chart. As stated
previously, it is not recommended that the relief valve
(2) cartridge assembly is disassembled for
maintenance purposes. Ensure that motor/triple pump
(1) 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 relief valve (2) is in
good clean condition and fit for use, the seals should
be replaced prior to re-assembly. Any damage to the
motor section or any of the pump elements would
necessitate a new motor/triple pump (1) 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.
FAULT DIAGNOSIS
CONDITION REASON ACTION
Non rotation of shaft No oil supply. Check pressure at rear section of triple gear pump.
Pressure should be 110 bar (1600 psi) at 2200 rpm,
when oil is at operating temperature.
Internal relief valve (2) sticking. Clean/replace relief valve.
Relief valve faulty. Check - refer to Section 250-0120, RELIEF VALVE.
Brake packs overheating No brake cooling oil supply. Check oil level in brake cooling tank.
Pump elements damaged. Replace motor/triple pump.
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