Physics free-body diagram problem?

[kal854]

What forces are acting on the hoist system, and where are they acting on it? The only ones I can think of are tension (from the string) and weight (of the hoist and of the man).

http://tinypic.com/r/w6tx0j/5

Thanks in advance!

 

[Basic_Physics]

There is also the normal force at the wheels. The other forces at the joints will cancel each other out.

 

[Chestermiller]

The problem statement specifically asks for the forces acting on the hoist arm, not the overall hoist. The man's weight does not act on the hoist are...only the tension in the cord. There are also horizontal and vertical components of force acting at the two connection points with the remainder of the hoist body.