Needle drive stud to reciprocator fit is measured in terms of the amount of vertical free play in the needle with the machine powered up.
Color change to either needle 1 or 16. Measure the vertical free play of the current needle using a dial indicator fixture (Fixture Number 32453) to measure the distance that the needle bar travels up and down. It should be less than 0.006” [0.15mm].
Color change to the next needle and measure it, and check all 16 needles.
There is no adjustment to the needle drive stud to reciprocator fit.
If the fit is found outside of the .006” [0.15mm] maximum specification, report this via email to QualityAssurance@melco.com.