Operation and maintenance manual

Section 250-0000
Braking System - Braking System Schematic
SM 2155 Rev 1 10-03
4
2. Check oil level in both tanks and add oil if low. Oil
should be halfway up sight gauge on both tanks.
WARNING
To prevent personal injury and property
damage, be sure wheel blocks and blocking
materials are properly secured and of adequate
capacity to do the job safely.
3. Ensure gear shift selector is in neutral, block all
road wheels, secure shipping bar in position and
release the park/emergency brake.
4. Install a clear length of tubing over bleed nipple on
one of the brake packs. Position the opposite end of
the tubing into a suitable container.
5. Crack open bleed nipple and operate treadle valve
gently to bleed air in the brake lines.
6. When the oil from the brake pack is clear (not cloudy
or creamy) close bleed nipple and remove length of
tubing.
WARNING
Do not operate the vehicle until all air is bled
from the braking system.
7. Perform steps 4 through 6 for the remaining five
brake packs until the brake system is clear of air.
8. Check hydraulic oil level and add oil if low. Fill
hydraulic tank with oil specified in Section 300-0020,
LUBRICATION SYSTEM. Oil should show halfway up
sight gauge on the hydraulic tank.
9. Check brake cooling oil level and add if low. Fill
brake coolant tank with oil specified in Section 300-
0020, LUBRICATION SYSTEM. Oil should show
halfway up sight gauge on brake coolant tank.
HYDRAULIC OIL
The braking system should be kept filled with hydraulic
oil as specified in Section 300-0020, LUBRICATION
SYSTEM.
Whenever there is a hydraulic system failure, the oil
should be drained, the entire system flushed, oil filters
replaced, oil screens thoroughly cleaned and clean
hydraulic oil added to eliminate all metal particles or
foreign matter.
SERVICE TOOLS
It is recommended that the following tools are used
when carrying out pressure or temperature checks
during maintenance procedures. These tools, along
with other general service tools, are available from
your dealer. Refer to Section 300-0070, SERVICE
TOOLS, for part numbers of these tools.
Multi-gauge
The multi-gauge is basically four pressure gauges in
one. Continuous system pressure readings are
indicated on one of three simultaneously reading
gauges through a pressure range of 762 mm (30 in) of
vacuum to 345 bar (5 000 lbf/in
2
).
Non-contact Infrared Thermometer
The infrared thermometer can be used to spot heat
problems early in electrical, mechanical and hydraulic
systems. Hand held and easy to use, you simply aim,
pull the trigger, and read the temperature. Since there
is no need to touch what you are measuring,
temperatures of hard-to-reach or moving components
can be taken without getting burned or shocked.