Miller Electric APT-1000 Overtightening will strip threads, Reco Mmended VAL UES or Operat IO N

5-2. Checking Detector Pins And Checking/Replacing Shield Cup, Tip, And Electrode

CAUTION

OVERTIGHTENING will strip threads.		T I P A N D E L E C T R O D E W E A R B E Y O N D
•	Do not overtighten electrode, tip, and shield cup during assembly.	RECO MMENDED VAL UES or OPERAT IO N
•	Do not cross-thread parts causing stripping.	WITHOUT TIP OR ELECTRODE can damage
•	Use care during torch assembly and parts replacement.	torch.
		•	Inspect shield cup, tip, and electrode before cutting or whenever
		•	cutting speed has been significantly reduced.
			Do not operate torch without a tip or electrode in place.
		•	Be sure to use genuine replacement parts.
		•	A good practice is to replace both the tip and electrode at the same
			time.

4

5

3

NewWorn

2

3

B A

Turn Off power source, and discon- nect input power.

1Shield Cup

2Contact Surface

3Detector Pins

Unscrew shield cup, and wipe con- tact surfaces with a soft cloth. Con- tact surfaces must be clean so spring-loaded detector pins de- press when shield cup is installed. Check shield cup for cracks, and replace if necessary.

Check detector pins to make sure they move freely. If necessary, use electrical contact cleaner to loosen them.

4Tip

5Opening

Remove tip using supplied wrench. Check tip, and replace if opening is deformed or 50% oversize.

6 Electrode

Check electrode. If more than 0.039 in (1 mm) of the end is eroded, re- move electrode using supplied wrench, and replace.

Carefully reassemble in reverse or- der.

2	1	Thread Sizes:
C		A	M8 x .75
		B	M3 x .5
		C	M12 x 1
6

New

Worn

Ref. ST-800 225 / Ref. S-0093

OM-1572 Page 7