Chevrolet 1977 light duty truck Service Manual page 13

bearings on all trucks.
lubricated every 30,000 miles (24.000 miles Heavy Duty
Emission Vehicles) - lubricate every 12,000 miles in four
wheel drive trucks. Do not mix wheel bearing lubricants.
"Lo n g fibre" type greases should
CAUTION:
not be used on roller bearing front wheels.
Rear
The rear 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 TE R CYLINDER
Check m aster cylinder fluid level in both reservoirs
every 7,500 miles or 12 months (6,000 miles or 4 months
Heavy Duty Emission Vehicles). If the fluid is low in the
reservoir, it should be filled to a point about 1/4" from
the top rear o f each reservoir with Delco Supreme No.
11 Hydraulic Brake Fluid or equivalent.
BRAKE A N D CLUTCH PEDAL S PR IN G S
Lubricate brake and clutch pedal springs every 7,500
miles or 12 m onths (6,000 miles or 4 months Heavy Duty
Emission Vehicles) with engine oil for all models.
P A R K IN G BRAKE
Every 7,500 miles or 12 months (6,000 miles or 4
m onths Heavy Duty Emission
lubricate all park in g brake pivot points with w ater
resistant EP chassis lubricant which
M otors Specification G M 6 0 3 1-M.
STE ER IN G
M anual S teering Gear
The steering gear is factory-filled with steering gear
lubricant. Seasonal change of this lubricant should not
be perfo rm e d and the housing should not be drained-no
lubrication is required for the life o f the steering gear.
Every 30,000 miles
Emission Vehicles), the gear should be inspected for seal
leakage (actual solid grease-not ju st 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 TE : 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 VER-FILL the gear housing.
Pow er S teering System
Check the fluid level in the pum p reservoir at each
oil change period. Add G M Power Steering Fluid (G M
1050017 or equivalent) as necessary to bring level into
pro p e r range on filler cap indicator depending upon fluid
tem perature.
If at op eratin g tem perature (approximately 150 °F-
hot to the touch), fluid should be between " H O T " and
" C O L D " marks.
Wheel bearings should
Vehicles) clean and
meets G eneral
(36.000 miles Heavy Duty
be
If at room tem perature (approximately 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 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 water resistant EP chassis
lubricant which meets G eneral Motors Specification G M
6 0 3 1-M every 7,500 miles or 12 months (6,000 miles or 4
months Heavy Duty Emission Vehicles).
Lubricate every 3,000 miles or 3 months (2 months
Heavy Duty Emission Vehicles), whichever occurs first,
under the following conditions:
• Driving in dusty or muddy conditions.
• Extensive off-road use.
NOTE: Ball joints 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
recommendations). Check U bolt nuts after the first
1,000 miles o f operation if the U bolt or U bolt nuts are
changed in service.
HOOD LATCH AN D HOOD H IN G E
Every 7,500 miles or 12 months (6,000 miles or 4
months Heavy Duty
occurs first, lubricate hood latch assembly and hood
hinge assembly as follows:
1. Wipe off any accumulation of dirt or contaimi-
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 prim ary and secondary
latch mechanisms.
4. Lubricate hood hinges.
Emission Vehicles), whichever