Weekly Post-Trip Inspection And Maintenance Procedures - freightliner WALK-IN VAN CHASSIS Operator's Manual

Pre- and Post-Trip Inspections and Maintenance
than 30 seconds, eliminate any leaks or
replace the air compressor before operat-
ing the vehicle.
20.3
Check the air pressure reserve as follows:
With the air system fully charged to 120
psi (827 kPa), stop the engine and note
the air pressure. Then make one full brake
application and observe the pressure
drop. If it drops more than 25 psi (172
kPa), all areas of leakage must be elimi-
nated before operating the vehicle.
20.4 Check the air leakage in the system as
follows:
With the parking brake (spring brake) ap-
plied, the transmission out of gear, and
the tires chocked, charge the air system
until cut-out pressure of 120 psi (827 kPa)
is reached.
With the service brakes released, shut
down the engine, wait 1 minute and note
the air pressure gauge reading. Observe
the air pressure drop in psi (kPa) per min-
ute.
Charge the air system until cut-out pres-
sure of 120 psi (827 kPa) is reached. With
the parking brakes released and the ser-
vice brake applied, shut down the engine,
wait 1 minute and note the air pressure
gauge reading. Observe the air pressure
drop in psi (kPa) per minute.
If leakage exceeds the limits shown in
Table 11.2, repair all areas of leakage be-
fore driving the vehicle.
Maximum Allowable Service Brake Leakage
Brakes Released
2 psi/min. (14 kPa)
Table 11.2, Maximum Allowable Service Brake
Leakage
21.
Test the parking brake on a 20 percent grade.
Apply the hand brake with the vehicle on a 20
percent grade (or as steep a grade that the ve-
hicle may normally be parked on). The ramp sur-
face should be made of Portland cement or
equivalent. If the parking brake does not hold the
vehicle, repair the parking brake system.
11.9
Brakes Applied
3 psi/min. (21 kPa)
22. Check the operation of the Bendix® Hydro-Max
brake booster, as follows.
22.1
With ignition off, depress the brake pedal
and listen for the back-up motor to en-
gage. Also, note that the pedal force re-
lieves; the pedal should depress easily.
22.2 With the ignition off, engine running, park-
ing brake released, ensure that the
BRAKE warning indicator light is not on.
This is a dual indicator and indicates that
the parking brake is set, and warns if
there is a hydro-max failure other than
loss of back-up motor power.
23. Inspect the engine and chassis wiring.
Check for loose wiring, chafed insulation, and
damaged or loose hold-down clamps. Tighten
loose wires or hold-down clamps; replace dam-
aged wiring or clamps.
24. Test the service brakes.
When starting to move the vehicle and before
picking up speed, test the brakes with the foot
pedal and parking brake control valve (yellow
knob) to be sure they will bring the vehicle to a
safe stop.
Weekly Post-Trip Inspection
and Maintenance Procedures
1. Inspect the batteries and battery cables.
WARNING
Battery posts, terminals, and related accessories
contain lead and lead compounds, chemicals
known to the State of California to cause cancer
and reproductive harm. To prevent possible per-
sonal injury, always wash your hands after han-
dling battery parts and related accessories.
1.1 Check the battery cables for chafing and
proper routing. Be sure the battery hold-
down is secure. If it is loose, tighten the
hold-down bolts; if it is damaged, replace
it. Replace the battery cable if damaged.
1.2 If the battery is equipped with a built-in
hydrometer, examine the hydrometer. If a
green dot shows in the sight glass, the
battery is sufficiently charged.