freightliner WALK-IN VAN CHASSIS Operator's Manual page 84

Pre- and Post-Trip Inspections and Maintenance
02/09/95
10
3
5
7
08/23/93
Fig. 11.11, Tightening Pattern, 10-Hole Wheels
1
7
5
3
03/08/2012
Fig. 11.12, Tightening Pattern, 8-Hole Wheels
Fig. 11.10, Worn Stud Holes
1
8
6
4
9
2
f400081a
2
4
6
8
f400052a
NOTE: Vehicles operating under severe or
adverse conditions should be checked more
frequently.
20. Check the air brake system for proper operation.
20.1
Check the air governor cut-in and cut-out
pressures as follows:
Run the engine at fast idle. The air gover-
nor should cut out the air compressor at
approximately 120 psi (827 kPa). With the
engine idling, apply the brake pedal sev-
eral times. The air governor should cut in
the air compressor at approximately 100
psi (689 kPa). If the air governor does not
cut in and out as described above, it must
be adjusted to these specifications. If the
air governor cannot be adjusted or re-
paired, replace it before operating the ve-
hicle.
20.2 Check the air pressure buildup times as
follows:
With the air system fully charged to 120
psi (827 kPa), make one full brake appli-
cation and note the air pressure reading
on the gauge. Continue to reduce the air
pressure by moderate brake applications
to a maximum of 90 psi (620 kPa), then
run the engine at governed rpm. If the
time required to raise the air pressure to
120 psi (827 kPa) (from the pressure
noted after one brake application) is more
f400001
11.8