Chevrolet Light Duty Truck 1973 Service Manual page 21

REAR AXLES
Standard
Every 4 months or 6,000 miles, whichever occurs first,
check lubricant level and add lubricant, if necessary, to
fill to level of filler plug hole. Use GL-5 G ear Lubricant
as shown in the following table. (For vehicles normally
operated in Canada, use SAE 80 GL-5 G ear Lubricant.)
O u tsid e T e m p e ra tu re
BELOW 10°F
UP TO 100°F
ABOVE 100°F
C ONSISTENTLY
On 20 or 30 Series trucks, drain lubricant every 24,000
miles. If vehicle is operated in exceptionally heavy work
or at continuous high speeds, the lubricant should be
changed every 12,000 miles. It may be necessary to
change lubricant more often if vehicle is used off road in
dusty areas.
Positraction
Drain and refill at first 12,000 miles then maintain same
as standard axle but use only the special Positractign
lubricant available at your authorized dealer.
PROPELLER SHAFT SLIP JOINTS
Propeller shaft slip joints should be lubricated every
6,000 miles or 4 months with water resistant EP chassis
lubricant which meets General Motors Specification GM
6031-M.
UNIVERSAL JOINTS
All universal joints are the needle bearing type.
Lubricate those universal joints (depending on truck
model) equipped with lube fittings every 6,000 miles or 4
months with water resistant EP chassis lubricant which
meets General Motors Specification GM 6031-M. More
frequent lubes may be required on heavy duty or "Off
the Road" operations.
WHEEL BEARINGS
Front
NOTE: Use wheel bearing lubricant GM
Part No. 1051344 or equivalent. This is a
premium high melting point lubricant which
meets all requirements of General Motors
Specification GM 6031-M.
Due to the weight of the tire and wheel assembly it is
recommended that they be removed from hub before
lubricating bearings to prevent damage to oil seal. Then
remove the front wheel hub to lubricate the bearings.
Viscosity Lu b ric a n t T o Be Used
SAE 80
SAE 90
SAE 140
GENERAL IN F O R M A T IO N A ND L UBRICATION
The bearings should be thoroughly cleaned before
repacking with lubricant.
Front wheels are equipped with tapered roller bearings
on all trucks. Wheel bearings should be lubricated every
24.000 miles. Do not mix wheel bearing lubricants.
Long 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. When installing bearings which have been
cleaned, prelube with wheel bearing grease.
BRAKE MASTER CYLINDER
Check master cylinder fluid level in both reservoirs every
6.000 miles or 4 months. If the fluid is low in the
reservoir, it should be filled to a point about 1/4" from
the top rear of each reservoir with Delco Supreme No.
11 or D.O.T.-3 Hydraulic Brake Fluid or equivalent.
BRAKE AND CLUTCH PEDAL SPRINGS
Lubricate brake and clutch pedal springs every 6,000
miles or 4 months with engine oil for all models.
PARKING BRAKE
Every 6,000 miles or 4 months clean and lubricate all
parking brake pivot points with water resistant EP
chassis lubricant which meets General Motors Specifica­
tion GM 6031-M.
STEERING
Manual Steering Gear
The steering gear is factory-filled with steering gear
lubricant. Seasonal change of this lubricant should not
be performed and the housing should not be drained-no
lubrication is required for the life of the steering gear.
Every 36,000 miles, the gear should be inspected for seal
leakage (actual solid grease-not just 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 Gear Lubricant which meets GM Specification
GM 4673-M, or its equivalent.
NOTE: Do not use EP Chassis Lube, which
meets GM Specification GM 6031-M, to
lubricate the gear. DO NOT OVER-FILL the
gear housing.
NOTE: Lubricate intermediate steering shaft
with water resistant EP chassis lubricant
which meets General Motors Specification
GM 6031-M every 6,000 miles or 4 months
on P-10 models only.
Power Steering System
Check the fluid level in the pump reservoir at each oil
change period. Add GM Power Steering Fluid or
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LIGHT DUTY TRUCK SERVICE MANUAL