60–01 Cab Suspension Air Bag
Inspection
Inspect the cab suspension air bags at the rear of
the cab. Check for wear, leakage, and damage. Re-
place if necessary.
Inspect the cab suspension shock absorber for dam-
age or leaking fluid. Replace if necessary.
60–02 Cab Tilt Pump Reservoir
Fluid Level and System
Check
Before checking the hydraulic fluid level in the tilt
pump reservoir on Argosy COEs, the cab must be in
the operating position, with the cab latches locked
and the valve lever in the "down" position. Let it re-
main in this position for at least five minutes before
checking the reservoir. The reservoir is full when the
fluid level reaches the threaded area of the fill plug
location.
If the hydraulic fluid level is low, check all fittings and
lines for leaks. If any fittings are loose, tighten them
finger-tight, then tighten with a wrench until there is
firm resistance; tighten one-sixth turn more. Replace
any damaged or worn fittings or lines before adding
fluid. Then bleed any air from the system; see
Group
60
of the
Century Class Trucks Workshop Manual
for
instructions. Add MIL–5606 fluid or an equivalent oil
to bring the level up to the bottom of the fill tube
elbow.
A "spongy" feel in the operation of the pump indi-
cates that air is present in the hydraulic cab-tilt sys-
tem. Bleed the air from the system; see
Group 60
of
the
Century Class Trucks Workshop Manual
for
instructions.
Check for wear of the mounting pin on both tilt cylin-
ders when the cab is in the raised position. Check
that the pins are securely fastened by inspecting the
two retaining Torx® screws at the top of each assem-
bly. Check the tilt pump mounting bolts for tightness;
see
of this manual for torque values for
lubricated or plated fasteners.
60–03 Cab Access Stairs
Inspection, Argosy COE
On Argosy COEs, inspect the cab access stairs for
wear, damage, or excessive dirt build-up, and verify
that the step is operating properly. Inspect the bump
stops, and replace if necessary. See
Check the step alignment using the door frame as a
reference. Verify that the steps are parallel with the
door frame, and that a constant gap is maintained.
Also check the side-to-side level of the step. Adjust if
necessary. Refer to
Section 60.20
of the
Century
Class Trucks Workshop Manual
for instructions.
60–04 Mirror Folding Check
For vehicles with folding main mirrors, make sure
that the mirrors fold freely on the pivot points. Pivot
each mirror fully forward and backward two times to
break loose any debris that may affect the fold-away
feature of the mirror.
Cab
60
Century Class Trucks Maintenance Manual, September 2010
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