400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 981995 Testing of Off-Highway Mobile Hydraulic Components H. Martin Wisland Dynex/Rivett Inc. Reprinted From: Fluid Power for Off-Highway Applications (SP-1380) International Off-Highway and Powerplant Congress and Exposition Milwaukee, Wisconsin September 14-16, 1998Downloaded from SAE International by Stony Brook Univ, Sunday, August 12, 2018The appearance of this ISSN code at the bottom of this page indicates SAE’s consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition, however, that the copier pay a $7.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sec- tions 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department. To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior wri tten permission of the publisher. ISSN 0148-7191 Copyright 1998 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the paper if it is pu blished in SAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 30 0 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility DatabaseDownloaded from SAE International by Stony Brook Univ, Sunday, August 12, 20181981995 Testing of Off-Highway Mobile Hydraulic Components H. Martin Wisland Dynex/Rivett Inc. Copyright © 1998 Society of Automotive Engineers, Inc. ABSTRACT Designers of mobile and off-highway equipment are developing more efficient systems to meet the demands of increased competition. Improving designs often includes a review of the hydraulic system, as engineers seek more efficient means of transmitting power. Increas- ingly, the focus is on reducing the size of hydraulic com- ponents or concentrating power in smaller package sizes. This can be accomplished by using higher operating pressures. To meet this challenge, developers of new off-highway hydraulic components must be able to test under those more demanding high pressure conditions. Fortunately, there are now more test-stand components available to support these manufacturers, as they design and qualify their products for higher operating pressures. Component testing is currently being conducted at pres- sures as high as 15 000 psi (1040 bar). As this trend toward higher pressures continues, component manu- facturers will need durable high-pressure test systems to qualify products to meet the requirements of future mobile equipment. THE PURPOSE OF THIS PAPER is to review some of the high pressure hydraulic components currently avail- able for use on test-stands. The paper will describe some existing test systems being used in the mobile equipment industry. These ty