PARKER Banner has developed a customised propel spool for open-centre applications.
The company says that it identified the problem through a customer that claimed its operators were having difficulty loading and unloading a small directional drill unit off trailers. The propel was surging when flow was first introduced to the propel motors in either travel direction.
Parker Banner says that they were concerned about operator safety and potential equipment damage. High operating temperatures due to system pressure losses was another concern. A major hydraulic circuit redesign was not an acceptable solution due to costs and time constraints.
The firm developed a customised propel spool for this open-centre application.
According to Parker Banner, review of the flow requirements resulted in increasing the valve size and development of a spool to improve the metering characteristics of the propel circuit.
Development turnaround time was reduced since all testing was done on the customer’s machine. Other improvements to additional Parker components were incorporated during the testing phase.
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