*MIL-L-2105B Extreme -Pressure Lubricant (or API classification GL-5) of the
SAE viscosity recommended in the chart at the right is preferred. All lubricants
should be backed by the reputation of a well known supplier. It is im- portant to
specify EP lubricants of the MIL-L- 2105B type only, or of a API classification
Heavy Duty Engine Oil of the proper SAE viscosity and backed by the
reputation of a well known supplier will provide satisfactory operation. It is
important to specify the heavy duty type, with the old API service designation
MS - new SAE service designation SD or SE.
Straight Mineral Gear Oil of the SAE viscosity recommended in the chart and
backed by the reputation of a well known supplier of petroleum products is
*Do not use extreme pressure lubricants other than MIL-L-2105B or of a
API classification GL-5. Many EP lubricants contain highly-active chemical
compounds that have been formulated to perform satisfactorily in specific types
of applications. Severe corrosion, residual deposits, and inadequate lubrication
may result from Improper application. Use of EP lubricants other than MIL-L-
2105B or of a API classification GL-5 may result In failure and/or impaired
DRAINING ECONOMY --The object in draining the transmission oil periodically is to eliminate possible bearing
surface abrasion and attendant wear. Minute particles of metal, the product of normal wear in service, are
deposited in and circulate with the transmission oil. The oil change chemically, due to its repeated heating and
cooling, also the terrific churning it undergoes in the presence of air. It Is desirable to drain out this used oil at
least every 24,000 vehicle miles or 500 hours of service - more frequently when operating in a dusty or dirty
environment. Do this only when the transmission is thoroughly warm.
FLUSHING - After draining, flushing is desirable. Replace the drain plug and fill the transmission to the proper
level with a light flushing oil. Drive the transmission for a short period at fast idle In such a manner that the gears
in the transmission are rotating without load. This washes out the old oil clinging to the interior of the gear case,
covers and shifter rails. Be sure to drain out all of the flushing oil before attempting to refill with new oil.
REFILL-- First, remove all dirt around the filler plug. Then refill with new oil of a grade recom- mended for the
existing season and prevailing service. Fill to the bottom of the level testing plug positioned on the side of the
transmission. Do Not overfill, as the excess quantity will serve no useful purpose. If the oil level is too high, it
will cause excessive oil churning and attendantly high oil temperature and possible leakage.
INSPECTION - Oil0 level inspection should be made every 1,000 miles. Always clean around filler plug before
inspection. Add sufficient oil to maintain correct level.