I added gantry crane assembler to my resume today with the help of a friend of mine. I got lucky on a couple of things, first that my Kubota front end loader could lift it high enough and second that it slides under that beam in my house with the cardboard cover just rubbing I literally have about 1/4 inch clearance heck yeah!
I did not have the ceiling height to assemble it on the floor then tip it upright so here are some assembly tips.
1. We installed the casters on the legs while on the workbench.
2. We laid the vertical posts and I-beam on the floor and bolted them together.
3. We lifted the I-beam onto the front end loader bucket and strapped it in place.
4. We lifted the I-beam and post assembly vertical with the Kubtoa then up off the floor about 9 inches.
5. We slid the legs with casters under and bolted them on.
6. I replaced the I-beam to posts and posts to legs bolts with 1/2 inch grade 8 vs the grade 5 metric supplied bolts. The 1/2 inch bolts were larger than the supplied metric bolts and just barely fit the holes, I'm talking .006 clearance. I was concerned that if they had not accurately drilled all these holes the 1/2 inch bolts would not fit, I mean there was no slop left in the bolt holes. Surprisingly they drilled the holes spot on and this was not an issue except for one hole which we just drilled out to 1/2 inch.
7. I used the supplied metric bolts for the casters as they were actually larger than 3/8 inch and 7/16 inch bolts were too large for the holes.
8. I ended up using the supplied metric bolts for the angled tubular supports. The reason is even the supplied bolts were tight fitting on the back supports and the front supports flat did not fit at all. The bolt hole was about 1/8 inch off center and we had to drill them out to 5/8 inch.
Honorable mention - the HF air wrench made tightening all these bolts a breeze!
Next I'll get the trolley's and chain hoists hung.