Specific recommendation of brand and grades of lubricants cannot be made because of regional availability, operation
conditions and the continual development of improved quality in the lubricant laboratories. For specific types of lubricants
such as required for drive units, wheel bearings, etc., it is suggested that this manual and component manufacturer's
maintenance manuals be reviewed with a reliable supplier who must assume the responsibility for recommendations.
Lubricants that meet military specifications for a specific usage will serve as the best guide to final selection.
DRIVE GEAR LUBRICANTS.
"Standard" SAE 90 viscosity lubricants are to be used in units that operate under average conditions except where
extreme low temperatures prevail when "optional" SAE 80 viscosity lubricants may be required. This multipurpose
extreme pressure gear oil must contain SCL type additives and provide necessary and suitable load-carrying
characteristics to prevent scoring and wear, have good stability in storage and service and give good resistance to
corrosion. Fillers or any other substances which produce an artificial viscosity are not permitted. An API-GL-4 or API-GL-
5 lubricant best meet these requirements.
WHEEL BEARING GREASE.
This grease shall be a homogenous combination of refined petroleum oil and stable soaps or thickeners which will produce
a smooth textured product in an NLGI Grade No. 2 consistency. It shall not contain corrosive or abrasive materials and it
shall inhibit corrosion in the presence of moisture.
This NLGI Grade No. 0 grease shall be a homogenous combination of refined mineral oil and metallic soap or a mixture of
metallic soaps. The grease shall not contain any fillers which adversely affect