The Traktor Kannon is an old Ork weapon available during 2nd Edition. A powerful energy-based traktor beam is projected towards any target and the beam pulls it towards the source with large amounts of force. Often the gun was used to scatter formations by dragging large objects through them, or even firing the cannon at troops. This would throw them around as if they were in a storm. Vehicles and buildings could be torn apart by the forces applied to them.
Due to power restraints, the beam is fired in bursts, which provides a brief period of time for forces to regroup, rather than in one continual shot. If something goes wrong, it is common for the polarity of the beam to be reversed, thereby dragging that kannon towards the enemy target, or even for it to overheat, preventing it from keeping up a high rate of fire.
Extraído y traducido de Lexicanum.
Codex: Orkos (II Edición).