Chevrolet 1977 light duty truck, Service Manual

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bearings on all trucks. Wheel bearings should be
lubricated every 30,000 miles (24.000 miles Heavy D uty
Emission Vehicles) - lubricate every 12,000 miles in four
wheel drive trucks. Do not mix wheel bearing lubricants.
CAUTION:
"Lo n g fibre" type greases should
not be used on roller bearing front wheels.
Rear
T he re a r wheel bearings receive their lubrication
from the rear axle. W hen installing bearings which have
been cleaned, prelube with wheel bearing grease.
BRAKE M A S T E R CYLINDER
Check m aster cylinder fluid level in both reservoirs
every 7,500 miles or 12 m onths (6,000 miles or 4 m onths
H eavy Duty Emission Vehicles). If the fluid is low in the
reservoir, it should be filled to a point about 1 /4" from
the top re a r o f each reservoir with Delco Supreme No.
11 Hydraulic Brake Fluid or equivalent.
BRA KE A N D C LU TC H PEDAL S PR IN G S
L ubricate brake and clutch pedal springs every 7,500
miles o r 12 m o n th s (6,000 miles or 4 m onths Heavy Duty
Emission Vehicles) with engine oil for all models.
P A R K IN G BRAKE
Every 7,500 miles or 12 m onths (6,000 miles or 4
m o n th s Heavy Duty Emission Vehicles) clean and
lubricate all p a rk in g brake pivot points with w ater
resistant EP chassis lubricant which meets G en eral
M otors Specification G M 6 0 3 1-M.
S TE E R IN G
M anual S teering Gear
The steering gear is factory-filled with steering gear
lubricant. Seasonal change o f this lubricant should not
be p e rfo rm e d and the housing should not be d rain ed -n o
lubrication is required for the life o f the steering gear.
Every 30,000 miles (36.000 miles Heavy Duty
Emission Vehicles), the g ear should be inspected for seal
leakage (actual solid grease-not ju s t oily film). If a seal is
replaced or the gear is overhauled, the gear housing
should be refilled with No. 1051052 (13 oz. container)
Steering G e a r Lubricant which meets G M Specification
G M 4673-M or its equivalent.
N O T E : Do not use EP Chassis Lube, which meets
G M Specification G M 6 0 3 1-M. to lubricate the
gear. D O N O T O V ER -FILL the gear housing.
P ow er S teerin g System
Check the fluid level in the p u m p reservoir at each
oil change period. A dd G M Power Steering Fluid (G M
1050017 or equivalent) as necessary to bring level into
p ro p e r range on filler cap indicator d ep en d in g upon fluid
tem perature.
I f at o p e ra tin g tem perature (approxim ately 150 °F-
hot to the touch), fluid should be between " H O T " and
" C O L D " marks.
If at room tem perature (approxim ately 70 F), fluid
should be between " A D D " and " C O L D " marks. Fluid
does not require periodic changing.
Linkage and Suspension
M a in ta in correct front end alignm ent 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 eneral M otors Specification G M
6 0 3 1-M every 7,500 miles or 12 m onths (6,000 miles or 4
m onths Heavy Duty Emission Vehicles).
Lubricate every 3,000 miles or 3 m onths (2 months
Heavy Duty Emission Vehicles), whichever occurs first,
u nd er the following conditions:
• Driving in dusty or m uddy conditions.
• Extensive off-road use.
N O TE: Ball jo in ts must be at + 1 0 G F. or more
before lubricating.
Keep spring to axle U bolts and shackle bolts
properly tightened (see Specifications Section for torque
recom m endations). Check U bolt nuts a fte r the first
1,000 miles o f operation if the U bolt or U bolt nuts are
changed in service.
HO O D LATCH A N D HOOD H IN G E
Every 7,500 miles or 12 m onths (6,000 miles or 4
m onths Heavy D uty Emission Vehicles), whichever
occurs first, lubricate hood latch assembly and hood
hinge assembly as follows:
1. W ipe off any accumulation o f dirt or contaim i-
nation on latch parts.
2. Apply lubriplate or equivalent to latch pilot bolt
and latch locking plate.
3. Apply light engine oil to all pivot points in
release mechanism, as well as p rim a ry and secondary
latch mechanisms.
4. Lubricate hood hinges.