Preventive Maintenance 16 17730-241
AR2
™
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— Check the overall
condition of the equalizing beam for dents, dings, or other damage. Inspect the equalizing
beam end connection and saddle cap fasteners for proper torque. The beam end connec-
tion must sustain proper clamp force of the axle bracket legs to the bushing inner casting
prevent any movement of the beam end connection. See Equalizing Beam End Connection
in this section. See Torque Specifications section of this publication for recommended
torque requirements.
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Fasteners — Look for any loose or damaged fasteners on the entire suspension. Make sure
all fasteners are tightened to a torque value within the specified torque range. See Torque
Specifications section of this publication for recommended torque requirements. Use a cali-
brated torque wrench to check torque in a tightening direction. As soon as the fastener starts
to move, record the torque. Correct the torque if necessary. Replace any worn or damaged
fasteners with genuine specified fasteners. For fasteners not supplied by Hendrickson, see
vehicle manufacturer.
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Torque rods — All torque rods must be inspected every six months for looseness, torn or
shredded rubber, bushing walk-out, and for proper fastener torque. If there is metal-to-metal
contact in the bushing joint, this is a sign of excessive bushing wear and the bushing needs
to be replaced.
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— Inspect all parts of the suspension for wear and damage. Look for bent
or cracked parts. Replace all worn or damaged parts.
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Frame hanger bracket — Check for any signs of loosening or damage at the pivot connec-
tions. Check for cracks, damage, or any signs of looseness at the mounting fasteners. Replace
all worn or damaged parts.
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Height control valve and air lines — Check the suspension air system for air leaks. Check
all air lines for proper routing. Check for chafing or pinched air lines. Check the height control
valve linkage for damage or interference with peripheral components. Replace all worn or
damaged parts.
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Trailing arm assembly — Check the overall condition of the trailing arm for cracks, dents,
dings, or other damage on the trailing arm assembly. Check the trailing arm bushings for tear-
ing or extreme bulging. Check for any metal to metal contact in the bushed joints. Replace all
worn or damaged parts.
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Tire wear — Inspect the tires for wear patterns that may indicate suspension damage or
misalignment. Replace all worn or damaged parts.
See vehicle manufacturer’s applicable publications for other preventive maintenance
requirements.
The axle brackets are furnished and welded into position by the vehicle manufacturer or axle
manufacturer.
When an equalizing beam is removed for repair or inspected, check for signs of movement. Also
inspect the axle brackets:
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For damage and / or cracks, see Figures 6-1 and 6-2
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Measure the two dimensions on the axle bracket legs, see Figure 6-2
An axle bracket outside of the measurement range, damaged or cracked must be repaired
or replaced. Consult the vehicle manufacturer for inspection, component repair and replace-
ment instructions.
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