Tweco 350 4R Wirefeeder - Manual (Page 37)

5-5 Manual 0-5182
set up weldskill 250, 350
Setup
Inserting Wire Into The Wire Feed Mechanism
A. Lift up the wire feeder pressure lever and pass the electrode wire through the inlet guide, between the
rollers, through the centre guide, between the rollers, through the outlet guide and into the MIG torch.
!
WARNING
DO NOT WEAR GLOVES WHILE THREADING THE WIRE OR CHANGING THE WIRE SPOOL.
B. Lower the pressure lever and with the torch lead reasonably straight, feed the electrode wire through the
torch. Fit the appropriate contact tip, eg a 0.9mm tip for 0.9mm wire.
C. Press the Torch switch to feed the wire through the torch.
!
WARNING
The electrode wire will be at welding voltage potential whilst it is being fed through the wirefeeder
system if the wire is fed by using the TORCH SWITCH.
Drive Roller Pressure Adjustment
The moveable rollers apply pressure to the grooved feed rollers via a scaled adjustable tension screw. These
devices should be adjusted to a minimum pressure that will provide satisfactory WIREFEED without slippage. If
slipping occurs, and inspection of the wire contact tip reveals no wear, distortion or burn back jam, the conduit
liner should be checked for kinks and clogging by metal flakes and swarf. If it is not the cause of slipping, the
feed roll pressures can be increased by rotating the scaled tension screws clockwise. The use of excessive
pressure may cause rapid wear of the feed rollers, shafts and bearing.
5.04 Wire Reel Brake
The wire reel hub incorporates a friction brake which is adjusted during manufacture for optimum breaking.
If it is considered necessary, adjustment can be made by turning the large nut inside the open end of the hub
clockwise to tighten the brake. Correct adjustment will result in the wire reel circumference continuing no
further than 20mm after release of the trigger. The electrode wire should be slack without becoming dislodged
from wire spool.
CAUTION
Overtension of brake will cause rapid wear of mechanical WIREFEED parts, overheating of electrical
component and possibly an increased incidence of electrode wire Burnback into contact tip.