GMC T-Series 2007 Owner's Manual page 311

(11) = Check steering system:
•
Look for damaged, loose, or missing parts.
Inspect the steering linkage relay rod and
tie rod ends for looseness or lack of lubricant.
Also look for parts showing signs of wear
or lack of lubrication. Replace parts as
needed. Also check steering gear mounting
bolts, pitman arm nut, gear housing upper
cover and side cover attaching bolts, steering
column mounting bolts, and cardan joint
clamp bolts; tighten if necessary. See the
service manual.
•
Inspect power steering hoses, tubes, and
fittings for leaks. Hoses and lines must not
be twisted, kinked, or tightly bent. Make sure
clips, clamps, supporting tubes, and hoses
are in place and properly secured.
•
Check steering gear for leakage around
pitman shaft and housing. If leakage is evident
(lubricant oozing out, not just oily film), leak
should be corrected immediately.
(12) = Check front and rear suspension. Look for
damaged, loose or missing parts or parts showing
signs of wear or lack of lubrication. Replace parts
as needed.
(13) = Adjust tire pressures as indicated on the
Certification or Tire Information label for optimum
tire life. See Tires on page 254 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 6,000 miles
(10 000 km). Check torque at 500 miles (800 km)
and 2,000 miles (3 000 km) 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.
311