I don't know what OS you're running but have you tried it with 7.5+? HDT 1.8 will load a SCSI Manager 4.3 compliant driver and the Jackhammer should be compatible with that, but I'm not sure the 030 machines support SCSI Manager 4.3.
I would certainly try it with 7.5 or 7.6.
I would certainly try it with 7.5 or 7.6.