To make the bucket, draw a rectangle. Draw another one outlining the first. At each end of the rectangle, draw a half-oval (the one on the left butts out; the one on the right butts in).
On the left edge of the bucket, add a line for depth. To make the arm, make a curved H shape with a bar across the top. Draw thick outlines for depth.
Next, we'll add the two front tires.