SAE TECHNICAL PAPER SERIES 931183 Application of Catalytic Converters to the Caterpillar 785 Off-Highway Truck William H. Lane and Aaron L. Smith Caterpillar Inc. The Engineering Society44th Annual Earthmoving For Advancing Mobility Land Sea Air and Space ®Industry Conference INTERNATIONALPeoria, Illinois April 20 & 21, 1993 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (412)776-4841 Fax:(412)776-5760Downloaded from SAE International by University of New South Wales, Sunday, August 26, 2018The appearance of the 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 $5.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 27 Congress St., Salem, MA 01970 for copying beyond that permitted by Sections 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 Depart- ment. 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. GLOBAL MOBILITY DATABASE All SAE papers, standards, and selected books are abstracted and indexed in the SAE Global Mobility Database. No part of this publication may by reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. ISSN 0148-7191 Copyright 1993 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 published 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 300 word abstract of a proposed manuscript to: Secretary, Engineering Activity Board, SAE. Printed in USA 90-1203B/PGDownloaded from SAE International by University of New South Wales, Sunday, August 26, 2018931183 Application of Catalytic Converters to the Caterpillar 785 Off-Highway Truck William H. Lane and Aaron L. Smith Caterpillar Inc. ABSTRACT Catalytic converters have been developed to reduce diesel engine emissions to aid in meeting the 1994 EPA on-highway standards for heavy duty (above 8,500 pound gross vehicle weight) trucks. As converters are made available for on-highway applications, questions inevitably arise as to their applicability to larger off-highway equipment. This paper covers the application of catalytic converters to a Caterpillar 785 off-highway truck operating in a diamond mine in Siberia. Targeted emissions for this application were unburned hydrocarbons (HC) (especially aldehydes), and carbon monoxide (CO). Experience from the on-highway converter development indicated oxidation catalysts could reduce these emissions. This paper addresses the development and selection of a catalytic converter for the 785 truck. Tradeoffs of vehicle modifications vs. catalytic converter performance and design are discussed. Service loads were also considered for the prediction of mechanical and emissions durability of the converter units. Finally, an update on a successful field test installation is given. INTRODUCTION Catalytic converters have been developed for use with on-highway diesel engines to help meet EPA regulations begin