Air bellows must be tightened on the chassis side first.
2.
The high hexagonal nut can be recognised by its height being 1.5 times the thread diameter. Evenly tighten the two U-bolt nuts alternately.
3.
Evenly tighten the two U-bolt nuts alternately.
4.
The yellow zinc-plated hexagonal nut can be recognised by its height being 1 times the thread diameter. Evenly tighten the two U-bolt nuts alternately.