We'll, it's kind of ambiguous as it can refer to several things. From what I understand the subject matter is baling equipment used at farms, in which case I can think it refers to the machinery, in which case "pressmaskineri", eller "balmaskineriet" might be suitable, or even the "balningskammaren".
On the other hand, it might refer to the actual product, in which case "bal", "den pressade balen" or some such might be suitable.