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When seasonal lubricant changes are made, it is a good plan to
wash out the transmission with a light oil to remove foreign substances,
such as grit or dirt. To do this, remove the drain plug at the
bottom of the transmission case, and allow the oil to drain off,
after which flush out the case thoroughly and refill with the oil
recommended.
Rear Axle
Keep the rear axle case filled with the lubricant
recommended below, so that the oil level stands even with the opening
in the filler boss on the rear side of the axle housing cover.
When seasonal lubricant changes are made, it is a good plan to
wash out the rear axle with a light oil to remove foreign substances,
such as grit or dirt. To do this, remove the filler plug, at the
rear, and drain the oil. Then flush out thoroughly with a light
flushing oil and refill to the level of the plug with the recommended
lubricant listed below.
Universal Joint — Front
The universal joint is directly connected to and receives its lubrication
from the transmission. The pipe plug in the housing is for manufacturing
purposes and is used to fill the universal joint at the time the
car is assembled.
Front Propeller Shaft Assembly (1 1/2 Ton Trucks)
The front propeller shaft on all 1 1/2 -ton truck models is equipped
with two (2) pressure gun fittings. Lubricate with transmission
lubricant, S. A. E. 90 or S. A. E. 160, every 1,000 miles.
Transmission and Rear Axle Lubricants
During the summer months a lubricant having the viscosity, or body,
of a S. A. E. No. 160 oil should be used.
During the winter months, or when the atmospheric temperature is
expected to be consistently under 50° F., a lubricant having
the viscosity, or body, of a S. A. E. No. 90 oil should be used.
For extreme low temperatures, or when lubricants of the lower S.
A. E. viscosity number cannotbe obtained, it may be desirable to
thin the lubricant with a low viscosity low pour test engine oil,
or with kerosene. I f this procedure is necessary, the addition
of 30% of an oil such as 20W, or 10% kerosene, will reduce the
viscosity of a S. A. E. No. 160 lubricant to that of a S. A. E.
No. 90 lubricant.
Lubricants containing solid material in suspension are undesirable
for ball or roller bearing lubrication.
For your convenience, a table is appended, listing the proper classification
for various temperature conditions.
Front Wheel Lubrication
The front wheels run on ball bearings. It is necessary to remove
the wheels to lubricate the bearings. The bearing assemblies should
be cleaned and then packed with a high melting point front wheel
bearing grease. The bearing balls should be well coated with grease.
Do not pack the hub between the inner and outer bearing assemblies
nor the hub cap, as this excessive lubrication results in the grease
working out into the brake drums and lining.
In mounting the front wheels, great care must be taken to properly
adjust the bearings; an operation that requires mechanical skill.
Spring Shackles
The spring shackles and saddles are equipped with pressure gun
lubrication fittings. The shackles should be lubricated with the
lubricant recommended under "chassis lubricants."
Shock Absorbers
The spring shock absorbers should be kept filled with a low viscosity
(light body) shock absorber fluid, that has a pour test not higher
than 30° below zero.
The same fluid is used both summer and winter and will have similar
operating characteristics the year around.
Optional Mixtures to Approximate Equivalent Viscosity
Temperature S. A. E. S. A. E. Kero- S. A. E. 20-W S. A. E. Kero-
S. A. E. 20-W
Range No. No. sene No. Oil No. sene No. Oil
160 90 160 160 90
Above 50 degrees F. 100%
50 degrees F. to Zero degrees F. 100% 65% 35% 90% 10%
Below Zero degrees F. 90% 10% 40% 60% 80% 20% 60% 40%
Extreme Temperatures Below Zero 80% 20% 10% 90% 70% 30% 25% 75%
When Hard Shifting of Transmission
Gears is Encountered
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