17730-241 25 Preventive Maintenance
AR2
™
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Clean the cross tube and inspect it for cracks or excessive wear 8" to 10" from each end
where it enters into the equalizing beam center bushings
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Visually inspect the overall condition of the cross tube for dents, dings, or bent condition,
replace as necessary
A bent cross tube may cause misalignment of the axles, which may cause abnormal tire wear.
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Use a straight edge to inspect the straightness of the cross tube, replace as necessary
AIR FITTINGS
1. If an air leak is suspected, begin by building up the air system to normal operating pressure.
2. Spray all nylon tube air fittings with a soapy water solution to detect the leak location.
Air lines and fittings may be inspected for leaks using a soapy water solution. The height control
valve, however, cannot be inspected using this method. All height control valves have an allowable
leakage rate. The only acceptable method for inspection of the height control valves is the height
control valve test found in this publication.
3. If an air leak is located, ensure the tubing end is clean and in good condition and the end is
cut square. Check to see if the tubing is binding, bent or being pulled upon.
4. Visually inspect the air fitting’s O-ring seal for signs of damage or contamination.
The axle stops are supplied by the vehicle manufacturer.
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Check the axle stop to frame fasteners for proper torque. Follow the vehicle manufacturer’s
specifications
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Visually inspect for damage or excessive wear. Replace as necessary per the vehicle manu-
facturer’s specifications
It is not necessary to replace shock absorbers in pairs if one (1) shock absorber requires replace-
ment. For instructions on shock absorber replacement see Component Replacement section of
this publication.
Hendrickson offers a long service life premium shock absorber for
use on AR2 suspensions. When the shock absorber replacement is
necessary, Hendrickson recommends replacement with the identi-
cal original Hendrickson shock absorber for servicing. Failure to do
so will affect the suspension performance, durability, and will void
the warranty.
Inspection of the shock absorber can be performed by doing a
heat test and a visual inspection.
DO NOT GRAB THE SHOCK AS IT COULD POSSIBLY CAUSE
PERSONAL INJURY.
1. Drive the vehicle at moderate speeds on rough road for mini-
mum of fifteen minutes.
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