Federal Test Method 6511 describes a procedure for determining
load carrying ability of lubricating oils at 400 degree F with respect to
gears. Using a modified
Ryder Erdco Test
Drive System operating at 10,000 rpm, the lubricant
to a series of 400
degree F controlled tests at increasing gear tooth
loads. The teeth of one of the
gears are then
examined to determine
the scuffing area. The load carrying ability of the
lubricant is rated in accordance with the per cent of the tooth working area
scuffed.
