operators_manual

2. Locate the air suspension ride
height valve
3. Ensure that the tractor is fully laden
during this procedure. Do not use
these procedures on a vehicle that
is not laden (bobtail).
4. Ensure the air supply and delivery
plumbing of the height control valve
is consistent with the following
illustrations.
5. Loosen the fasteners mounting a
height control valve to its bracket.
6. Rotate the valve either clockwise or
counterclockwise until air pressure
in the air springs provides the ride
height specified for that suspension.
Measure the ride height from the
bottom of the frame rail to the
approximate centerline of the
rearmost drive axle hub:
• For tandem axles, make the
vertical measurement at the
centerline of the suspension
• For a single axle, make the
measurement in front of the axle,
in the area forward of the tires
but not past the suspension
bracket.
7. When at the correct ride height,
ensure that the height control valve
lever is in the neutral position, then
install either the built-in alignment
pin or a 1/8-inch (3 mm) dowel.
8. Torque the mounting fasteners to
55-75 lb-in (6.2-8.5 Nm.).
9. Remove the alignment pin or dowel.
10. Repeat Steps 2 through 6 above for
the RH valve on vehicles with a
dual-valve system.
DRIVING - Axle and Suspension
Y53-6096-1A1 (01/17) 121
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