Operation and maintenance manual

Section 250-0025
Braking System - Brake Coolant Tank
SM 2156 7-02
2
5
4
FROM HYDRAULIC
TANK
TO HYDRAULIC
TANK
TO HYDRAULIC
TANK
TO BRAKE PACKS
REAR
CENTRE
FRONT
FROM BRAKE PACKS
REAR
CENTRE
FRONT
1
6
2
3
7
SM - 2748
strainer (34) before it is pumped through the brake
cooling circuit.
The brake cooling oil is drawn from brake coolant tank
(1) by motor/triple pump (4, Fig. 2) and pumped through
the low pressure relief valve (6, Fig. 2) to supply each
brake pack. Refer to Section 250-0045, MOTOR/
TRIPLE PUMP ASSEMBLY.
The low pressure relief valve (6, Fig. 2) ensures that
only low pressure cooling oil is supplied to the brake
packs. There are three pressure relief valves housed in
valve (6, Fig. 2), one for each axle, which are set at 1.5
bar (22 psi).
Return oil from the brake packs flows through disc
brake oil cooler (5, Fig. 2), manifold block (7, Fig. 2)
and filter assembly (3, Fig. 2) before entering the tank
storage area. The filter assembly has a bypass valve
which allows oil to bypass element (14) when it is cold
or when the filter element (14) is blocked.
MAINTENANCE
Numbers in parentheses refer to Fig. 1.
Note: Tighten all fasteners without special torques
specified to standard torques listed in Section
300-0080, STANDARD BOLT AND NUT TORQUE
SPECIFICATIONS.
WARNING
To prevent personal injury and property
damage, be sure wheel blocks, blocking
materials and lifting equipment are properly
secured and of adequate capacity to do the job
safely.
Checking Oil Level
1. Start up the machine and bring the oil to correct
operating temperature.
2. Position the vehicle in a level work area, ensure the
body is fully lowered, apply the parking brake and
switch off the engine.
Fig. 2 - Hydraulic Schematic of Brake Coolant Tank
1 - Brake Coolant Tank
2 - Strainer
3 - Filter
4 - Motor/Triple Pump
5 - Disc Brake Oil Cooler
6 - Low Pressure Relief Valve
7 - Manifold Block