Choke Removal And Replacement Procedure - Lincoln Electric Fleet 650 Service Manual

LINCOLN ELECTRIC

CHOKE 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 Choke assemblies.
MATERIALS NEEDED
1/2" Socket
1/2" Open-End Wrench
1/2" Nutdriver
Penetrox Heat Sink Compound (Lincoln Part #T12837-1)
Wiring Diagram
REMOVAL PROCEDURE
1. Turn off the engine on the Fleet 650 machine.
2. Perform the Case Cover Removal Procedure.
3. Perform the Chopper Module Capacitor Discharge Procedure.
4. Perform the Front Panel Removal Procedure.
5. Using a 1/2" socket and a 1/2" open-end wrench, remove the two bolts, nuts, lock washers and four
flat washers securing leads B2/B5, B2/B5 to the positive terminal of the output rectifier bridge and
leads B1/B4 and B1/B4 to the negative terminal of the output rectifier bridge. See Figure F.42. See
Wiring Diagram. Label and disconnect leads.
6. Label and disconnect plug J3 from the weld control board. See Figure F.43. See Wiring Diagram.
7. Using a 1/2" nutdriver, remove the four screws securing the choppers and chokes bracket to the
machine. See Figure F.44.
8. Carefully remove the choppers and chokes bracket from the machine.
9. Using a 1/2" socket and a 1/2" open-end wrench, remove the nut, bolt, lock washer and flat washer
securing leads to each terminal of the choke being removed. See Figure F.45. See Wiring Diagram.
Repeat this step for the other choke assembly, if necessary.
10. Using a 1/2" socket and a 1/2" open-end wrench, remove the two bolts, nuts and flat washers
securing the choke assembly to the choppers and chokes bracket. See Figure F.45.
11. The choke assembly(s) can now be removed and replaced.
Fleet™ 650 Service Manual
77