Steering Diagnostics Service Manual - TRW …
TRW Automotive
Commerci al St eeri ng Syst ems
Steering Diagnostics Service M anual
CHART YOUR WAY TO EASY STEERING
A w arning describes hazards or unsafe practices w hich could result in severe personal injury or death. A caution describes hazards or unsafe practices w hich could result in personal injury or product or property damage. A note gives key information to make follow ing a procedure easier or quicker.
N oti c e
This guide w as prepared for the purpose of providing general advice concerning the diagnosis and correction of commercial vehicle steering related problems. This guide is intended for the use of properly trained, professional mechanics, NOT "Do-it-Yourselfers". Also, this guide should be used in conjunction w ith service manuals provided by both the vehicle and component manufacturers. Diagnosis and correction of commercial vehicle steering related problems should only be handled by properly trained, professional mechanics w ho have the proper equipment, tools, instructions and know -how to perform the w ork properly and safely.
Pow er Steering System Analyzer (PSSA) Gauge
Some of the tests in this manual require the use of a PSSA. This device is a combination flow meter, shut-off valve, and pressure gauge. This tool w ill allow you to measure flow and pressure, and provide a load on the pump through the hydraulic lines of the steering system. This tool is required to correctly analyze a steering system. TRW recommends that you DO NOT BEGIN TROUBLESHOOTING A STEERING SYSTEM WITHOUT THE USE OF A PSSA. If you are not sure how to use a PSSA, you may refer to the video available through our w ebsite at: w w w.. This video compliments the tests in this book w hich require the use of the PSSA.
Throughout this troubleshooting guide, test procedures are recommended to help locate the cause of each complaint. W hile performing these tests, TRW advises that you TAKE NECESSARY PRECAUTIONS w hen w orking w ith internal vehicle components and hot hydraulic fluids.
? TRW Inc., 2002
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Table of Contents
Preface ................................................................................ 3 Flow Chart Diagrams .......................................................... 7 Test Procedures ................................................................ 19 Comments ........................................................................ 35 Test Results ...................................................................... 39
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