Oh that brings back bad memories. Long story short I once had a Toledo scale loaded halfway in my truck before it came crashing down. In honor of my almost crushed feet I will never move a big heavy thing without help of smart able bodied people. Oh an there doesn't look like a lot of parts but when there scattered on the ground, there sure is.
now to go back on topic....I have no idea how to adjust it but good luck. I am sure someone here will know or have a source that does.