Lincoln Electric R3R-300 Removal of Choke and TOP Iron Assembly, Figure F.34 Choke Removal

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F-56 F-56

TROUBLESHOOTING & REPAIR

MAIN TRANSFORMER REMOVAL & REPLACEMENT (continued)

FIGURE F.34 – CHOKE REMOVAL

CHOKE

	THRU-BOLTS
	(4)
BOTTOM	GLASTIC
"E" IRON
	STIFFENERS

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REMOVAL OF CHOKE AND TOP IRON ASSEMBLY

1.Remove the two (left and right) glastic stiffen- ers connecting the negative rectifier plate and choke assembly to the main transformer thru-bolts. See Figure F.34.

2.Remove the top choke lead from the polarity selector switch or the negative output termi- nal.

3.Remove the bottom choke lead from the neg- ative rectifier plate.

4.Label and cut the choke thermostat leads.

5.Using the 9/16” deep well socket wrench, remove the four thru-bolts that clamp the top “E” iron and choke assembly to the bottom “E” iron. NOTE: for easier reassembly, clean the threads.

6.Using a hoist, carefully lift the choke and top iron assembly out and clear of the trans- former coils.

NOTE: The coils may be “stuck” to the top iron and may require some careful prying to dislodge them. Depending upon which coil(s) are to be replaced, it may be advantageous to remove some of the “stuck” coils with the top iron.

7.The leads from the coils that are to be removed and/or replaced must be discon- nected. See the Wiring Diagram.

When aluminum leads are re-connected, apply a thin layer of Dow Corning 340 Heat Sink Compound to mating surfaces.

IDEALARC R3R