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MAINTENANCE
D-4D-4
NA-5
WIRE DRIVE MOTOR
Periodically inspect the wire drive motor
brushes, Figure D.4. Replace the brushes
as needed.
CHANGING WIRE FEED GEAR
RATIOS
Four wire size conversion kits are available
to modify the wire feeder for different size or
type electrodes. The kits include drive rolls
and guide tubes for the wire specified, as
shown in Table D.1.
TABLE D.1 - CONVERSION KITS
Wire Type in. (mm) Conversion Kit
3/32-7/32 (2.38-5.56) T13724-A
Solid or Cored
1/16-3/32 (1.59-2.38) T13724-B
Solid or Cored
0.035-0.052 (0.89-1.32) T13724-C
Solid
0.045-0.052 (1.14-1.32) T13724-D
Cored
Refer to Table D.2. Four gear ratios are
available: 21:1, 57:1, 95:1, and 142:1. To
change the gear ratio, replace the motor
pinion and the first reduction gear per the
following instructions (Refer to Figures D.4,
D.5 and D.6).
NOTE: Any item numbers in parentheses
on Figure D.5 refer to item numbers in the
task description breakdown.
FIGURE D.5 – CHANGING THE WIRE
FEED GEAR RATIO
1. Remove the four screws that mount
the adapter plate and motor assembly
to the gear box. Remove the adapter
plate and motor assembly from the
gear box.
2. Take the two long screws removed in
step 1 and screw one into each of the
tapped holes located on the face of
fiber input helical gear (12). Insert the
screws through the full thickness of
the gear, and using a screwdriver
wedged between the screws to
prevent rotation, remove hex nut (11)
that holds the gear to the shaft.
Remove plain washer (9).
TABLE D.2 – WIRE FEED GEAR RATIOS.
Feed Speed Max Wire Size
Gear Range in. (mm)
Ratio in/min (m/min)
Cored Wire Solid Wire
21:1 100-2070 (2.54-52.58) 0.052 (1.3) 0.052 (1.3)
57:1 40-778 (1.02-19.76) 3/32 (3.0) 1/16 (1.6)
95:1 22-456 (0.56-11.58) 5/32 (4.0) 1/8 (3.2)
142:1 15-300 (0.38-7.62) 5/32 (4.0) 7/32 (5.6)
HEX NUT (11)
PLAIN WASHER (9)
WOODRUFF
KEY (8)
WIRE
FEED
GEARBOX
INPUT
HELICAL
GEAR (12)
SLOT HEAD
SCREWS
(MOUNTING
SCREWS)
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