GMC 1976 ZEO 6083 Maintenance Manual page 9

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GENERAL INFORMATION
Also each 12 months or 12,000 miles, clean ex-
terior of radiator core and air conditioning con-
denser . Every 24 months or 24,000 miles, drain,
flush, and refill the cooling system with a new coo-
lant solution .
10 REAR WHEEL BEARINGS-Clean and repack
rear wheel bearings with a lubricant as specified in
the "Recommended Fluids and Lubricants" chart .
CAUTION :
"Long fiber" or "viscous" type
greases should not be used. Do not mix
wheel bearing lubricants. Be sure to
thoroughly clean bearings and hubs of all
old lubricant before replacing .
11 FINAL DRIVE AXLE BOOTS AND OUTPUT SHAFT
SEALS-Check for damaged, torn or leaking boots on
drive axles and for leaking output shaft seal . Replace
defective parts as necessary .
SAFETY MAINTENANCE
12 OWNER SAFETY CHECKS-The maintenance
schedule folder in the glove box lists several items the
owner should check and have repaired if not correct .
13 TIRES AND WHEELS-To equalize wear, rotate
tires as illustrated in Section 10 . Adjust tire pressures
as recommended on tire placard on glove box door .
Check disc brake pads and condition of rotors while
wheels are removed . Check tires for excessive wear
or damage . Make certain wheels are not bent or
cracked and wheel nuts are tight . Check tire inflation
pressure at least monthly, or more often if daily
visual inspection indicates the need .
14 EXHAUST SYSTEM-Check complete exhaust
system and nearby body areas of vehicle engine and
motor-generator system for broken, damaged, miss
ing or mispositioned parts, open seams, holes, loose
connections or other deterioration which could per-
mit exhaust fumes to seep into the passenger com-
partment . Dust or water in the passenger
compartment may be an indication of a problem in
one of these areas. Any defects should be corrected
immediately. To help ensure continued integrity, ex-
haust system pipes rearward of the muffler must be
replaced whenever a new muffler is installed .
15 ENGINE DRIVE BELTS-Check belts driving fan,
Delcotron, power steering pump and air condition-
ing compressor for cracks, fraying, wear and tension .
Adjust or replace as necessary .
It is recommended that belts be replaced every 24
months or 24,000 miles, whichever occurs first .
16 SUSPENSION AND STEERING-Check for da-
maged, loose or missing parts, or parts showing visi-
ble signs of excessive wear or lack of lubrication in
front and rear suspension and steering system . Ques-
tionable parts noted should be replaced by a qualified
mechanic without delay.
17 BRAKES AND POWER STEERING-Check lines
and hoses for proper attachment, leaks, cracks, chaf-
ing, deterioration, etc. Any questionable parts noted
should be replaced or repaired immediately . When
abrasion or wear is evident on lines or hoses, the
cause must be corrected .
18 DRUM BRAKES AND PARKING BRAKE-Check
drum brake linings and other internal brake compo-
nents at each wheel (drums, wheel cylinders, etc .) .
Parking brake adjustment also should be checked
whenever drum brake linings are checked .
NOTE: More frequent checks should be made if
driving conditions and habits result in frequent brake
application .
19 THROTTLE LINKAGE-Check for damaged or
missing parts, interference or binding . Any deficien-
cies should be corrected without delay.
20 UNDERBODY-In geographic areas using a
heavy concentration of road salt or other corrosive
materials for snow removal or road dust control,
flush and inspect the complete under side of the
vehicle at least once each year, preferably after a
winter's exposure . Particular attention should be
given to cleaning out underbody members where dirt
and other foreigh materials may have collected .
21 BUMPERS-Check the front and rear bumper
systems at 12-month/ 12,000-mile intervals to be sure
the impact protection and clearance originally de
signed into the system remains in a state of full readi-
ness . They also should be checked whenever there is
obvious bumper misalignment, or whenever the vehi-
cle has been involved in a significant collision in
which the bumper was struck, even when no damage
to the bumper system can be seen .
EMISSION CONTROL
MAINTENANCE
(1974 CERTIFIED ENGINE)
22 THERMOSTATICALLY CONTROLLED AIR
CLEANER-Inspect installation to make certain that
all hoses and ducts are connected and correctly in-
stalled . Also check valve for proper operation .