CUT40 Parts Substitution Card

This is the quick external-parts substitution card for the highest-value CUT40 torch, air, and guide-hardware splits.

Use This Card When

Complaint branch	Swap first	If the complaint follows the part...	If the complaint stays with the machine...
no start with otherwise normal idle state	fresh CB50 front-end stack	keep diagnosis in the torch branch	move to air and control logic
unstable air routing or weak cut	known-good hose and dry air path	keep diagnosis in the air branch	move deeper only if the air path is proven
transfer complaint on dirty work or weak clamp	known-good clamp and clean steel baseline	keep diagnosis in the work-return branch	move deeper only after clamp proof
guided cut behaves badly	known-good guide or stand-off hardware after freehand proving	keep diagnosis external and mechanical	move deeper only if freehand and guided cuts both fail

Stop if a front-end or guide correction restores the machine.
Stop if dry air correction removes the complaint.
Stop if freehand cutting is healthy and only guide hardware changes the complaint.
Stop using the card and open the full guide if torch, air, and guide branches are already proven clean.