Lincoln Electric NA-5S, NA-5NF Wire Drive Mechanism, Wire Straighteners, Solid Electrode

D-5 MAINTENANCE D-5

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3.Pull the gear from the shaft using the screws as a pulling device.

4.Be certain woodruff key (8) is properly located on the shaft. Screw the adapter plate and motor assembly mounting screws into the new fiber input helical gear from the stenciled side and place the gear on the shaft. Replace plain washer (9), tighten the hex nut (1), and remove the adapter plate and motor assembly mounting screws from the gear.

5.After noting the relation of the adapter plate with the motor leads, remove the adapter plate from the wire drive motor. See Figure D.6. Support the pinion properly and, with the proper size punch, drive the roll pin that holds the pinion out of the shaft. Pull the pinion off. Install the new pinion and replace the roll pin. Replace the adapter plate in its original location.

6.Cover the teeth of the motor pinion and the input gear with a non-fluid molydisulfide type grease such as Non-Fluid Oil Corporation’s A-29 Special/MS Lubricant. This grease can be scooped from the cavity of the gear case.

7.Reassemble the motor on the gear box; make sure the gears mesh properly and the adapter plate locating bead is in its cavity. Replace and tighten the four screws removed in step 1.

8.Jumper on wire speed meter PC board must be properly positioned for the gear ratio and drive rolls being used (See the wiring diagram for the wire speed meter PC board.)

WIRE DRIVE MECHANISM

Drive mechanisms for three wire size ranges are available: 0.035 through 0.052 in. (0.9 through 1.3 mm), 1/16 through 3/32 in.

1.6through 2.4 mm), and 3/32 through 7/32 in. (2.4 through 5.6 mm). If changing to wire sizes outside this range, change the drive rolls and the incoming and outgoing guide tubes. Also change the gear ratio as necessary.

NA-5

FIGURE D.6 – DRIVE MOTOR PINION GEAR REMOVAL.

WIRE

DRIVE

MOTOR

SHAFT

ADAPTOR

PLATE

PINION

ROLL PIN MOUNTING

SCREW (X3)

The electrode is driven by gripping between the grooved drive rolls and spring-loaded idle roll. Replace the drive rolls when they become worn. The drive rolls for 1/16 in. (1.6 mm) and larger diameter electrodes have two sets of teeth so they can be reversed once before they must be replaced.

WIRE STRAIGHTENERS

Solid Electrode

Periodically inspect the slide bushing at the top of the straightener and the ingoing wire guide at the bottom of the straightener for signs of wire milling. If necessary, rotate the guide to present an unworn surface. To reverse the slide bushing for a fresh wear surface, remove the cross adjustment screw and turn the bushing over.

Flux-Cored Electrode

Severe wear at the “V” groove in the curved arm of the straightener can result in wire wander at the arc. Periodically check the groove and replace the arm when badly worn. Also replace the ingoing guide at the top of the straightener if it shows signs of wire milling.