GMC 1982 Light Duty Truck Service Manual page 15

OB-6 MAINTENANCE AND LUBRICATION
This is an explanation of the service listed in the
Vehicle M aintenance Schedule.
N O R M A L V E H I C L E
instructions contained in the m ain tenan ce schedule are
based on the assumption that the vehicle will be used as
designed:
• To carry passengers and cargo within the limitations
indicated on the Tire Placard located on the edge of the
driver's door,
• on reasonable road surfaces within legal operating
limits,
• on a daily basis, as a general rule, for at least several
miles (km), and
• On unleaded gasoline (gasoline light duty emission
only).
U nusual operating conditions will require more
frequent vehicle maintenance as specified in the respective
sections.
S E C T IO N A
GENERAL M A IN T E N A N C E
A - l Chassis Lubrication
Large fluid loss in any of these units may point out a
problem. Repair these problems promptly.
Lubricate the following system or units:
Steering Linkage an d Suspension
Lubrication Intervals
a. On C20, G30 and P20, lubricate every 4 months or
6,000 miles (9 600 km).
b. On all other vehicles, lubricate every 12 months or
7,500 miles (12 000 km).
M aintain correct front end alignment to provide easy
steering, longer tire life, and driving stability.
Check control arm bushings and ball joints for wear.
Lubricate tie rods, upper and lower control arms, and
ball joints at fittings with w ater resistant EP chassis
lubricant which meets G M Spec 6031M. Lubricate every 3
months (Light Duty), 2 months (Heavy Duty and Diesel),
or 3,000 miles (4 800 km) whichever occurs first, under the
following conditions:
• Driving in dusty or muddy conditions.
• Extensive off-road use.
Ball joints must be at 10°F (-12°C) or more before
lubricating.
Transmission Shift Linkage
Lubricate shift linkage and manual transmission floor
controls lever contacting faces with w ater resistant EP
chassis lubricant which meets G M Spec 6031M.
Hood Latches
L u b ric a te hood latch assembly and hood hinge
assembly as follows:
1. Wipe off any accumulation of dirt or contamination on
latch parts.
2. Apply Lubriplate or equivalent to latch pilot bolts and
latch locking plate.
M A IN TEN A N C E SCHEDULE
U S E -T h e m aintenance
3. Apply light engine oil to all pivot points in release
mechanism, as well as primary and secondary latch
mechanisms.
4. Lubricate hood hinges.
5. M ake hood hinge and latch m echanism functional
check to assure the assembly is working correctly.
Door Lock C ylinder
Use W D-40 or equivalent spray lubricant as necessary
for free operation.
G as Tank Filler Door H inge
Clean area of dirt and old lubricant. Apply a few drops
of engine oil to friction point of door hinge. Work door
several times and wipe off excess lubricant.
Door H inge Assembly
Wipe off dirt and apply a thin coat of engine oil. Open
and close door several times to insure that the oil has worked
in effectively.
Door Jam b Switch
Apply a thin coat of lubriplate or equivalent to end of
surface of switch plunger.
Parking Brake Pulley, C able an d Linkage
Apply w ater resistant E P chassis lubricant which
meets G M Spec 6 0 3 1M, to parking brake cable at cable
guides and at all operating links and levers.
Accelerator Linkage
Lubricate carburetor stud and carburetor lever and
accelerator pedal lever at support with engine oil.
A -2 Fluid Levels
Check level in brake master cylinder, power steering
pump, radiator, transmission and windshield washer. Keep
engine freeze protection to -34°F (-37°C) or the lowest
expected outdoor temperature. Engine coolant also prevents
corrosion. Large fluid loss in any of these units may point out
a problem. Repair these problems at once. A low fluid level
in the brake master cylinder can indicate worn disc brake
pads and should be checked.
Check battery and the following fluid levels:
B attery Care
The original equipment battery (two batteries on diesel
engine) needs no periodic m aintenance.
permanently sealed (except for two small vent holes) and
has no filler caps. W ater will never have to be added.
T he hydrom eter (test indicator) in the top of the
battery provides information for testing purposes only. See
Section 6D for battery test procedures.
Brake M aster C ylinder
Check fluid level in each reservoir and maintain 1/4"
below lowest edge of each filler opening with Delco Supreme
No. 11 or DOT-3 hydraulic brake fluid, or equivalent.
A low fluid level in the brake master cylinder can
indicate worn disc brake pads, and should be checked
accordingly.
Its top is