GMC 2010 T-Series Owner's Manual page 258

(13) = Adjust tire pressures as indicated on the
Certification or Tire Information label for optimum tire
life. See Tires on page 5 59 for further details. Check
tires for excessive or abnormal wear or damage. Also
check for damaged wheels. Replace wheels and/or tires
as needed.
(14) = Check spring-to-axle U-bolts and shackle bolts
for proper torque. See the service manual for torque
sequence and specifications. When parts are replaced,
the torque must be checked and adjusted more often
during the first 10 000 km (6,000 miles). Check torque at
800 km (500 miles) and 3 000 km (2,000 miles) after first
use of parts.
(15) = Check complete exhaust system, including DPF
pressure lines, and cab areas near the exhaust system
for broken, damaged, missing, or out-of-position parts.
Also inspect for open seams, holes, loose connections,
or other conditions which could let exhaust fumes seep
into the driver compartment. Needed repairs should
be made at once. To help maintain system integrity,
replace exhaust pipes whenever a new muffler is
put on.
(16) = Adjust valve lash. Incorrect valve clearance will
result in increased engine noise and reduced engine
output.
6-20
(17) = With the engine off and below normal operating
temperature, check to see that the thermostatically
controlled engine cooling fan can be rotated by hand on
viscous-operated drives. Replace as needed.
(18) = Check shields and underhood insulation for
damage or looseness. Adjust or replace as needed.
(19) = Wheel bearing service:
Grease type Clean, inspect, and lubricate
with the proper wheel bearing grease at
designated intervals or when hubs are removed.
See Part C: Recommended Fluids and Lubricants
on page 6 28.
Oil-filled type Some wheel bearings are
lubricated by axle lubricant. When you have
oil-filled hubs, use lubricant identical to that used
in the axle. Lubricant change intervals are the
same for front and rear axles. However, you must
maintain the proper oil level between change
intervals. See Front Wheel Bearings with Oil-Filled
Hubs on page 5 58 and Part C: Recommended
Fluids and Lubricants on page 6 28.
(20) = Check the air intake system installation to
see that gaskets are seated properly and all hose
connections, fasteners, and other components are tight.
Tighten connections and fasteners or replace parts as
required.