Hi,
I reproduced your problem: as soon as you add a cross section view in the drawing with your design, you can no longer export the pdf.
The root cause of the problem is a weird geometry in the design (but it should not prevent from exporting the pdf, so there are actually also a corner case’s bug in drawing 
).
If you make a cross section and zoom you will see there is actually a small hole in the design.
Best way to fix your design is to split the body, project the section on a plane, trim the unwanted lines, and create a clean body by revolving the cross section.
Then you will have to re-create the drawing and the dimensions, but it will export in pdf.
I made a short video showing the process.