Troubleshooting and repair – Lincoln Electric POWER MIG SVM170-A User Manual

Page 83

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F-43

TROUBLESHOOTING AND REPAIR

F-43

POWER MIG 255C

11. Swing the idle arm up and away from

the wire drive assembly.

12. Use a screwdriver and remove the

round head screw, lock washer, and flat
washer securing the molded drive roll
shaft assembly to the wire drive assem-
bly.

13. Remove the molded drive roll shaft

assembly and the rest of the outer
guide assembly from the wire drive
assembly.

14. Use a screwdriver and remove the pan

head screws and lock washers secur-
ing the motor/gearbox assembly to the
wire drive assembly.

15. Grasp the motor/gearbox assembly and

wiggle the motor/gearbox assembly
gently back and forth until it separates
from the wire drive assembly.

16. Use a 7/16 in. nutdriver to remove the

hex head cap screws, lock washers,
and flat washers securing the wire
drive assembly to the wire drive
compartment.

17. Remove the wire drive assembly from

the wire drive compartment.

18. Reassemble the wire drive assembly in

the reverse order.

PROCEDURE

1. Disconnect main input power to the

machine.

2. Remove the wire gun and wire.

3. Lift the wire drive door to gain access to

the wire drive assembly.

4. Lift the tool tray door to allow access to

the tool tray.

5. Use a 5/16 in. nutdriver and remove the

tool tray to gain access to the
motor/gearbox assembly.

6. Disconnect the wire connectors J13

and J12 to the motor/gearbox assem-
bly. See Wiring Diagram.

7. Use a 3/4 in. wrench and remove the

flange nut and positive lead from the
wire drive assembly. See

Figure F.12.

8. Use pliers to remove the hose clamp

and flex hose from the wire drive
assembly.

9. Remove the outer guide assembly from

the wire drive assembly by loosening
the thumb screws until the outer guide
can be removed.

10. Rotate the adjustment arm assembly

counterclockwise to release the tension
on the idle arm.

WIRE DRIVE ASSEMBLY REMOVAL AND REPLACEMENT (continued)

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