This exercise was conducted to improve performance of an existing open center system. Reduced horsepower consumption also resulted in the elimination of the oil cooler. Correct sizing of components is essential for maximizing system efficiency. Simply evaluating the cost of each component will obscure the overall savings achieved by integrating a complete system.A significant benefit to this system versus pressure compensation is the simplicity. Compensators can misbehave. An open center valve has far fewer moving parts and rarely suffers front debris getting lodged in small opening. Anyone who has been in the position of analyzing a pressure compensated valve problem in the field can attest to the difficulty of determining what combination of factors brought on rite problem. The fewer the variables the better. Princeton Delivery Systems, a leading North American manufacturer of material handling equipment, recently unveiled the latest generation in its line of Piggy Back track-mounted forklifts. The PB50 and PB65 incorporate a range of improvement from their predecessors and mark one of the first applications of Caterpillar''s new four-cylinder 3024 compact diesel engines.

Jeff/KTR: Prevent rust and make sure fasteners are tightened to the specified torques after a minimum operation time. Replace the device if it starts to slip. Reconfirm the selection, and be sure to check the dimensions and surface finish of the bore and shafts.Doug/Zero-Max: Keep the connection screws properly torqued for maximum holding forces, and use a connection with a minimum number of adjusting screws.Jim/Stafford: Replace socket screws when sockets become worn. Don''t use wrenches with rounded corners. Don''t use a screwdriver to spread collars, or a hammer to move them along a shaft.Keith/U.S. Tsubaki: Higher quality locking devices are practically maintenance-free. There is no need to periodically retighten locking bolts or replace the unit, even in high-vibration applications. End users can extend service life even longer by keeping exposed surfaces clean and corrosion free.

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