Kenworth T410, Driver'S Handbook Manual

Page: 313 / 418

CAT: 8612 November 2019 Page 287
PREVENTIVE MAINTENANCE
VISUAL INSPECTION
For all vehicles, mandatory maintenance procedures include re-tightening of
U-bolts and complete inspection. However, even with proper maintenance,
many factors affect the service life of springs and suspension components,
for example fatigue, vehicle gross weight, type of load, road conditions
and vehicle speed.
It is important that U-bolts remain tight. Severe use of your vehicle can
cause them to loosen faster. All vehicles need to have their U-bolts checked
and tightened regularly. Be sure someone with the proper training and the
right tools checks and tightens the U-bolts on your Kenworth.
After the first 1,000km of operation, inspect the suspension periodically,
as noted below:
• Visually check for loose or missing fasteners, cracks in hanger or
axle connection brackets.
• Check springs are centred in hangers and in good condition.
• Check for cracks, wear marks, splits or other defects on the surface
of the spring.
• Replace defective parts. Because repaired springs cannot be fully
restored to their original service life, replace the complete assembly
if cracks or other defects are detected.
• After replacement of any part or discovery of loose components,
check the torque of all fasteners.
• New springs ‘settle-in’ after the vehicle’s initial service, causing the
U-bolts to become loose.
Failure to follow these recommendations could void warranty. See the
Kenworth Maintenance Manual for further information on servicing the
rear suspension.