$2.$ The gear$-$pulling assembly shown consists of a crosshead CF $,$ two grip arms ABC and FGH $,$ two links BD and EG$,$ and a threaded center rod JK$.$ The center rod JK must exert a $4800-$N force on the vertical shaft KL in order to start the removal of the gear.

a$)$ Determine the magnitude and direction of all forces acting on grip arm ABC. Assume that the rounded ends of the crosshead are smooth and exert horizontal forces only on the grip arms.

b$)$ Determine the normal, shear, and bending moment along a horizontal section immediately above point B on the grip arm.