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I've had some experience using a middle buster (potato digger) and my JD655 (only l6 HP) 4WD in attempting to dig a trench for a double row of 4" flex drain line. In order to obtain the maximum depth (I don't recall it being anymore than l6-l8") I had to adjust the top link such that the large V-plow was just a few degrees short of being vertical to the trench. This positioning coupled with our clay earth resulted in bending the bottom of the V blade and its heavy metal attaching shoe about 90 degrees backward. I couldn't believe my little l6 HP could do so much damage to a pretty heavy piece of equipment. Subsequently I used my HD rear-tine rototiller making numerious passes to obtain the desired width and depth. I've also done DB wire both in and out of pvc conduit. I agree that its better to run in the PVC. I consider it to be relatively cheap insurance. One caution though is to make the entire system "water-proof" by also using the necessary above ground pvc waterproof fittings/boxes (even with DB wire) so as to prevent the accumulation of water in the conduit. I don't know what code says about this but water and electricity tend to be incompatable and in my mind there is a big difference in having DB wire exposed directly to the earth (and natural moisture) as opposed to being continuously submerged in water for an infinite amount of time.

Trenching with middle buster plow
Operating and Attachments
Replies 9 Post by stuart