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Look closely after cleaning. It's not a regular zerk. It's a small fitting that takes a needle adapter that fits on the tip of your grease gun to lube the ball and socket of the double Cardin joint.
It's normally located just above the ball socket that can be reached with the shaft rotated to gain access at 3 or 9 o'clock position
It's normally located just above the ball socket that can be reached with the shaft rotated to gain access at 3 or 9 o'clock position