Lincoln Electric Classic 300 MP Service Manual page 39

LINCOLN ELECTRIC
11. If faulty, perform the Contactor CR2 Removal And Replacement Procedure.
Contactor CR1:
12. Label and disconnect leads 633 and 634 from contactor CR1 quick-connects. See Figure F.11. See
Wiring Diagram.
13. Using a volt/ohmmeter, measure the contacts resistance of contactor CR1. See Figure F.11. See
Wiring Diagram. Normal resistance should be approximately 500k ohms.
14. Using a 12 VDC power supply, apply 12 VDC to the contactor terminals. There should be an audible
click as the contactor closes. Using a volt/ohmmeter, measure the resistance across the terminals
of contactor CR1. See Figure F.11. See Wiring Diagram. Normal resistance is less than one ohm.
15. When testing is complete, connect the previously disconnected leads. See Wiring Diagram.
16. If any of the tests fail, the contactor CR1 may be faulty.
17. If faulty, perform the Contactor CR1 Removal And Replacement Procedure.
18. Using a 5/16" nutdriver, attach the thirteen screws securing the CV box support to the CV box base.
19. Using a 9/16" open-end wrench and a 9/16" nutdriver, attach the nut, bolt, lock washer and three
flat washers securing each side of the CV box to the fuel tank rail (two sets).
20. Perform the Case Cover Replacement Procedure.
Figure F.10 – CV box and mounting hardware location
Classic® 300 MP Service Manual
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