Lincoln Electric POWER FEED 25M Service Manual page 15

A-7
CHANGING THE DRIVE MOTOR GEAR RATIO
WARNING
• Turn off input power at the welding
power source before installation or
changing drive roll and/or wire
guides.
• Do not touch electrically live parts
such as the wire drive or internal
wiring.
• When feeding with the gun trigger, the electrode
and wire drive mechanism are "hot" to work and
ground and could remain energized several sec-
onds after the gun trigger is released.
• Only qualified personnel should perform this
operation.
------------------------------------------------------------------------
Extra
Torque
Gearing
Normal
Speed
Gearing
400
Extra Torque
Gearing
Normal Speed
Gearing
Tools required:
• 1/4" hex key wrench
• 3/4" open end wrench
• 9/16" socket and ratchet wrench
• 7/16" nut driver
• 5/16" nut driver
• Phillips screw driver
1. Remove the spool of electrode from the wire feeder.
2. Loosen the thumb screw at the wire drive and remove the
welding gun.
3. Remove the outer wire guide, drive rolls and inner wire
guide.
4. Use a 7/16" nut driver to remove the gear cover.
5. Use 9/16" socket and ratchet wrench to remove the lower
drive roll hub retainer. Remove the lower drive roll hub.
6. With a Phillips screwdriver, remove the screw, washer and
collar holding the pinion gear. Remove the pinion gear.
All manuals and user guides at all-guides.com
INSTALLATION
WFS
800
POWER FEED® 25M
7. Remove the busbar by unscrewing the bolt using a 3/4"
open end wrench.
8. With a 1/4" hex key wrench, loosen the socket head cap
screw securing the gun bushing. Remove the gun bushing
from the wire drive.
9. With a 5/16" nut driver remove the five screws securing the
wire drive panel. Lift out the wire drive panel and discon-
nect the molex connections.
10. Using a 5/16" nut drive, remove the four screws securing
the cover.
11. With a Phillips screwdriver, remove the three screws and
lock washers securing the motor. Remove the motor.
12. Place the motor in the new position.
13. Assemble the three screws and lock washer holding the
wire drive motor.
14. Assemble the molex connections and place the wire drive
assembly inside the wire feeder. Route the gas hose
through the opening in the wire drive panel.
15. Move DIP switch #8 on the Feed head board to the
appropriate position.
Gear Select DIP Switch #8 Setting
Normal Speed ON
Extra Torque OFF
16. Place the gun bushing in the wire drive and align the
threaded hole in the gun bushing with the hole in the feed
plate. With a 1/4" hex key, tighten the socket head cap
screw to secure the bushing in the wire drive.
17. Reassemble the busbar and tighten the mounting hard-
ware with a 3/4" open end wrench.
18. Place the new gear on the motor shaft. Secure the gear
to the motor shaft with the collar, washer and screw.
19. Reassemble the lower drive roll hub and lower drive roll
hub retainer.
20. Reassemble the gear cover.
21. Reassemble the inner wire guide, drive rolls and outer
wire guide.
22. Place the welding gun into the gun bushing and secure
with the thumb screw.
A-7
Range
50 – 800 ipm
30 – 400 ipm