ESAB EMP 255ic Instruction Manual page 46

7 MAINTENANCE
1. Disconnect the electrical power source from the unit.
2. Release the tension from the pressure rollers by turning the tension knob on the
tension arm counter-clockwise enough to pull it first up (out of its detent slot) and then
toward you (see 1 in illustration above). The tension arm will spring-up as soon as the
tension arm is released. This should free the wire movement to remove the wire.
3. Using (as needed) either soft-bristle brush or use a forced air source by blowing
compressed air (max. 5 bar) to remove all debris which may have accumulated in this
space. WEAR EYE PROTECTION.
4. Inspect if the input wire-feed guide, the output wire-feed guide, the center wire-feed
guide, or the feed rollers are worn and need replacement. See "WEAR PARTS"
section for ordering wear-part numbers. See "Removing wire-feed rollers" subsection
in "Removing/Installing wire-feed rollers" section and/or "Removing/Installing/Adjusting
wire-guides" section in the "OPERATION" chapter. If none need replacement – only
cleaning – go to the next step.
CAUTION!
Avoid removing the drive gear behind the left wire-feed roller. Doing so risks
losing the Woodruff key on the motor shaft. Losing this key renders the unit
useless until the key is replaced.
5. Remove the wire-feed rollers per "Removing wire-feed rollers" subsection in
"OPERATION" chapter.
6. Clean the wire-feed rollers with a soft brush.
7. Clean the pressure rollers attached to the tension arm with a soft brush.
CAUTION!
Do not loosen any of the set screws for any of the three components listed in
this next step.
Loosening any one will require re-adjusting their position as performed in
"Adjusting wire guides" section in "OPERATION" chapter.
8. Clean the input wire-feed guide, the output wire-feed guide, the center wire-feed guide
by blowing compressed air (max. 5 bar) through them (see illustration in "Output
wire-guide removal/installation" subsection in the "OPERATION" chapter.).
9. Replace the wire-feed rollers per "Installing wire-feed rollers" subsection in the
"OPERATION" chapter.
10. Close the tension-arm on to the wire in its groove on the wire-feed rollers.
NOTE!
Verify that the wire is in its groove and not floating out of the groove on the
roller surface.
11. Visually verify that the wire appears as a straight line through the entire wire-feed
assembly.
NOTE!
The bobbin may be turned counter-clockwise to take up any slack. Do this only
AFTER step 12 because the tension on the wire is the only force preventing the
movement of the wire at the torch tip.
12. Visually verify that the wire protrudes per specification at the torch tip and has not
been pulled into the torch head.
13. Adjust the wire-feed pressure by adjusting the tension on the wire at the wire-feed
rollers by turning the tension knob using the procedure in "Setting wire-feed pressure"
subsection in "OPERATION" chapter.
14. Close the door on the wire-bobbin side of the EMP unit.
0463 605 001 - 46 - © ESAB AB 2018