Chevrolet 10 Series 1968, Service Manual

Page: 19 / 713

LUBRICATION 0-16
lubricant level be made using the same type of lubricant
as in the housing.
TRANSMISSION CONTROLS
The brake retarder linkage and throttle valve linkage
for Allison Automatic transmissions should be lubricated
periodically. Contact points between rods, idlers, bell
cranks and supports should be lubricated with SAE 10
engine oil. A lubrication plus is provided in the Auxiliary
4-speed shift tower. Lubricate every 6,000 miles with
chassis lubricant.
FOUR WHEEL DRIVE
NOTE:
The two (2) rear lubrication fittings on
the front axle drive shaft are inaccessible.
Lubrication of this universal joint will require
disassembly of the shaft from the transfer case.
Most lubrication recommendations and procedures for
4 wheel drive equipped trucks are the same for corre­
sponding components of conventional drive trucks. Only
the front axle, including the differential and Cardon joint,
the transfer case, which transmits power from the trans­
mission to either front or rear axles, and associated
linkage points and air vents require special procedures.
Front Axle
The front axle should be checked every 6,000 miles and
refilled with SAE 90 “ Milti- Purpose Gear Lubricant
when necessary. With the differential at operating tem­
perature, fill to the level of fille r plug hole. If differ­
ential is cold, fill to level of 1/2” below the fille r plug
hole. Capacity: 5 pt.
Cardon Jofnt
After every 6,000 miles of driving, remove the slotted
pipe plugs from the ball ends of the axle housings. Check
lubricant and refill with SAE 140 Multi-Purpose lubricant
meeting U.S. Army Ord. Spec. MIL-L-2105B (1/2 pt. per
joint) is necessary. Replace the pipe plugs securely.
Air Vent Hose
Check vent hose for kinks and proper installation
every 6,000 miles.
Transfer Case
Check the transfer case level every 6,000 miles and,
if necessary, add lubricant to bring to the level of the
fille r plug hole. Use SAE “ Multi-Purpose” Gear Lubri­
cant, meeting requirements of U.S. Ordnance Spec.
MIL-L-2105B and follow the “ Gear Lubricant Viscosity
Table" on the previous page for proper viscosity “ Multi-
Purpose” gear lubricant to be used during vehicle
operation.
Control Lever and Linkage
Since no grease fitting is provided in the control lever
it is necessary to brush or spray engine oil on the lever
pivot point and on all exposed control linkage every
6,000 miles.
WHEEL BEARINGS
(10-30 SERIES)
NOTE:
Use high melting point wheel bearing
lubricant which meets General Motors Speci­
fication #GM 6031M.
FRONT
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. 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
30,000 miles. Do not mix wheel bearing lubricants.
CA U TIO N : “ Long fibre” type greases should
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.
40-80 SERIES
FRONT
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. The bearings should be thoroughly cleaned
before repacking with lubricant.
The front wheels are equipped with tapered roller
bearings on all models and should be cleaned and re­
packed with wheel bearing lubricant every 30,000 miles.
REAR
The rear wheel bearings on all except the trailing
rear axle on MA50 Series receive their lubrication
from the rear axle. When installing bearings which
have been cleaned, repack with lubricant. On MA50
Series trailing axle, check lubricant level of each wheel
hub every 6,000 miles. When necessary, remove plug
and refill hub to oil level mark with “ Multi-Purpose”
Gear Lubricant meeting U.S. Army Ord. Spec. M IL-L-
2105B as shown in the “ Gear Lubricant” Viscosity chart.
REAR AXLES
(10-30 Series)
Check lubricant level every 6,000 miles. When neces­
sary, refill to level of fille r plug hole using “ Multi-
Purpose” gear lubricant meeting U.S. Army Ord. Spec.
MIL-L-2105B as shown in the “ Gear Lubricant Viscosity
Chart” .
On 20 and 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 neces­
sary to change lubricant more often if vehicle is used
off road in dusty areas.
CHEVROLET TRUCK SERVICE MANUAL