We fit a 4-Roll geared wire feed drive assy to the following on our MTS251 and MTS450 MIG welders
The benefit of a 4-roll system over a 2-roll system is you achieve a smoother and very consitent feed of the mig wire when using longer 4 or 5 metre torches.
4-Roll systems are for the heavy industrial machines and most manufacturers only fit to thier top end models. A 2-roll feed unit gives very good consistent wire feed as well, a high amperage industrial machine is generally used in a heavy production enviroment.
We also use heavy duty wire feed motors which offer greater reliability and long life when compared to the smaller feed motors our competitors use.
The feed drive plate which houses the motor and rollers is made from metal which also add's to the durability and reliabilty compared to the plastic wire feed units you see on a lot of mig welders today.