The HR-5 has a manual grease drive cartridge. The HR-11 and HR-17 have recirculating oil.
The HR-5 has a direct drive belt. The HR-11 and HR-17 have a drive belt with a belt tensioner.
Compound lines have been moved to the outside for easy maintenence access.
New panel stand design.
The HR Series bowl is built from a certified pressure vessel tank head, chosen for it's strength and integrity. 50% additional polyurethane lining in high wear areas. The urethane is cast, not sprayed. Cast polyurethane improves media rebound and provides more wear depth as well as adds to strength and adhesion.