Lincoln Electric SVM188-A service manual Weld

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F-48 TROUBLESHOOTING AND REPAIR F-48

MAIN TRANSFORMER AND CHOKE

REMOVAL AND REPLACEMENT (continued)

FIGURE F.21 – CHOKE TIG WELD

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REPLACEMENT PROCEDURE

1.Place the flat washers and the choke on top of the transformer and the lift bale assembly over both.

2.Install the four thread cutting bolts that mount the lift bale to the transformer and then replace the choke mounting hardware that was removed in Step 20 of the removal procedure. See Figure F.20.

NOTE: Cover the transformer assembly with ‘damp’ shop cloths before performing Step 3 to prevent weld spatter from damaging the transformer.

3.Thouroughly clean the choke lead and the sec- ondary lead and TIG weld along the two edges. The welds must be at least as long as the widths of the two pieces See Figure F.21.

4.Mount the SCR Bridge assembly using the hard- ware and insulators removed in Step 18 of the removal procedure. See Figure F.18.

5.Connect the transformer secondary and snubber leads to the SCR assembly. See Figure F.19 for proper assembly. Torque all bolts per the following:

1/4”	bolts	6 ft/lbs.
5/16” bolts		11 ft/lbs.
3/8”	bolts	19	ft/lbs.
1/2”	bolts	45	ft/lbs.

6.Using the hoist, place the transformer/lift bale assembly over the mounting bolts in the base and replace the hardware removed in Step 21 of the removal procedure.

7.Carefully back track through the removal procedure, re-routing and re-connecting the leads that were cut, removed or separated using proper electrical techniques and insulating where required.

8.Replace the baffles and any sleeving, cable ties or sealants that were removed during the disassembly procedure.

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