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F-42
TROUBLESHOOTING AND REPAIR
F-42
LN-25™
CONTACTOR REPLACEMENT
(continued)
WORK SENSING LEAD
POLARITY
SWITCH
ELECTRODE
CABLE
V
OLTAGE SENSING
LEAD #67
WELDING CABLES
CONTACTOR
IN-LINE
CONNECTORS
11/16" BRASS
NUTS
ELECTRODE
LEAD
FIGURE F.26.
REPAIR PROCEDURE
1. Open the case door. Remove the wire reel by
removing the retaining collar. See Figure F.5.
2. Remove the screws holding the control box
cover in place and remove the control box
cover.
3. Remove the two fiber baffles from the area in
front of the contactor. See Figure F.25.
4. With a 3/4” wrench, remove the electrode
lead. See Figure F.26.
5. Using the 11/16” wrench, remove the two
brass nuts from the contactor terminals.
Remove the heavy leads and lead #67 from
the terminals. Note location of lead #67. See
Figure F.26.
6. Remove the 5/16” screw holding the contactor
bracket to the spindle bracket.
7. Disconnect the contactor coil leads by
separating the two in-line connectors behind
the reel stand assembly.
8. Cut or remove any cable ties or harness tape
as necessary.
9. Carefully remove the contactor assembly from
the LN-25™.
10. Install a new contactor in the LN-25™.
11. Connect the contactor coil lead in-line
connectors behind the reel stand assembly.
See Figure F.26.
12. Place contactor assembly in position.
13. Install the 5/16" screw to secure the contactor
to the spindle assembly.
14. Install the welding cables and voltage sensing
lead #67 to the contactor and secure with the
two 11/16" brass nuts. See Figure F.26. Be
sure brass nuts are tight. 11 ft-lb torque is
recommended.
15. Install the baffles in front of the contactor.
16. Install the control box cover and secure by
installing the screws previously removed.
17. Install the wire reel and retaining collar and
close the case door.
18. Install the two 5/8” screws previously removed
from the bottom of the machine.
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