Contactor Cr1 Removal And Replacement Procedure - Lincoln Electric Classic 300 MP Service Manual

LINCOLN ELECTRIC

CONTACTOR CR1 REMOVAL AND REPLACEMENT PROCEDURE

Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized
repairs performed on this equipment may result in danger to the technician or machine operator and will
invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety
notes and precautions detailed throughout this manual. If for any reason you do not understand the test
procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department
for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
TEST DESCRIPTION
This procedure will aid the technician in the removal and replacement of the Contactor CR1.
MATERIALS NEEDED
9/16" Open-End Wrench
9/16" Nutdriver
5/16" Nutdriver
11/16" Nutdriver
Wiring Diagram
REMOVAL PROCEDURE
1. Turn off the engine on the Classic 300 MP machine.
2. Perform the Case Cover Removal Procedure.
3. Using a 9/16" open-end wrench and a 9/16" nutdriver, remove the nut, bolt, lock washer and three
flat washers securing each side of the CV box to the fuel tank rail (two sets). See Figure F.40. See
Wiring Diagram.
4. Using a 5/16" nutdriver, remove the thirteen screws securing the CV box support to the CV box
base. See Figure F.40.
5. Label and disconnect the leads 633 and 634 from the quick connects of contactor CR1. See Figure
F.41. See Wiring Diagram.
6. Using a 11/16" nutdriver, remove the four nuts (two for each lead) securing the heavy leads to the
terminals on contactor CR1. See Figure F.42. See Wiring Diagram. Remove the nuts on at a time.
7. Using a 5/16" nutdriver, remove the four screws securing the contactor mounting plate to the CV
box assembly. See Figure F.42.
8. Carefully slide the contactor away from the two heavy leads and out of the CV box.
9. The contactor CR1 can now be removed and replaced.
REPLACEMENT PROCEDURE
1. Carefully position new contactor CR1 into the machine.
2. Using a 5/16" nutdriver, attach the four screws securing the contactor mounting plate to the CV box
assembly.
Classic® 300 MP Service Manual
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