A. Universal joints in the work to bear a lot of torque and alternating load, and calcium-based grease oil film toughness is poor, in the bearing and journal friction surface is difficult to form a good oil film.
In the general car repair manual are clearly defined: the drive shaft telescopic sleeve of the key and the middle bearing the use of calcium-based grease, cross-needle bearings and three-axle drive the rear axle drive axle bearing the use of gear oil. How
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