Wear of nonstandard involute gears with two types coatings, AlCrN and CrAlSiN, was studied. The coatings were applied by cathodic arc deposition. tested using a Niemann tester at graduated load up to the 12th stage compared noncoated gears. Both Biogear S150 gear oil PP90 universal hydraulic during these tests. thickness deposited wear teeth studied SEM their chemical compositions determined ED...