The functional fittings of the outer ball cage include dust-proof cover, clamp, grease and nut.

Dust shield is a protective cover made of rubber (synthetic or natural) or hard plastic (usually the same material). The function of dust cover is to protect oil from dust and water pollution. The dust shield broken, cracked or otherwise damaged should be replaced in time.

Dust-proof covers have been tested by professional machines to ensure that their low temperature resistance must be up to minus 40 degrees, and according to the requirements of the experiment, a number of tensile tests are carried out to ensure that no cracking occurs.

Good repair kit accessories can play an auxiliary role in prolonging the service life of the constant velocity universal joint ball cage.