(1) Gear跳动, full depth, addendum, tooth direction - are they qualified? One-tooth runout, pitch error - are they within tolerance?

(2) Is the installed distance of the gears and racks appropriate?

(3) The meshing clearance of the rack and pinion should be 0.25 times the module.

(4) Full rack depth, tooth jump, pitch line, especially the direction of the teeth, whether they meet the standards.