freightliner Cargo Manual page 81

Pretrip Inspection and Daily Maintenance
37. Check the tire inflation pressures and inspect each
tire for bulges, cracks, cuts, and penetrations.
38. Check for indications of loose wheel nuts or rim
nuts and examine each rim and wheel component.
39. Check the air brake system for proper operation.
40. Test the service brakes before leaving the lot.
41. Test the parking brakes on a 20 percent grade.
Pretrip Inspection and Daily
Maintenance Procedures
Whenever equipment requires adjustment, replacement,
repair, addition of lubricants, or a change of lubricants,
refer to the Cargo Workshop Manual for repair proce-
dures and specifications, and to the Cargo Maintenance
Manual for lubricant recommendations, specifications,
and maintenance intervals and procedures.
1. Drain the air brake system air reservoirs.
Air reservoirs serve as storage tanks for com-
pressed air. They collect water condensed from the
air and small amounts of oil from the air compres-
sor. Water and oil normally enter the reservoir in
the form of vapor because of the heat generated
during compression.
9.3
After the water and oil condense, they collect near
the tank drain valves. Drain the resulting emulsion
as follows:
WARNING
Failure to drain the air reservoirs as instructed
could cause sludge formation in the air brake sys-
tem. Sludge could adversely affect braking, causing
loss of control, which could cause death, personal
injury, or property damage.
NOTE: If the air reservoirs are not equipped
with automatic drain valves, they must be
drained daily. If they are equipped with auto-
matic drain valves, they must be drained in
this same manner at least once a week.
1.1 Open the wet tank valve (the drain cock or
pull-chain drain located on the forward end
of the supply air reservoir, which is con-
nected directly to the air compressor). Block
the valve open.
WARNING
When draining the air reservoir, do not look into the
air jets or direct them toward anyone. Dirt or sludge