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Rp maint guide Recommended Practice Proposed RP A T VMRS - - AIR-RIDE SUSPENSION MAINTENANCE GUIDELINES PREFACE The following Recommended Practice is subject to the Disclaimer at the front of TMC ? s Recommended Maintenance Practices Manual Users are urge

Recommended Practice Proposed RP A T VMRS - - AIR-RIDE SUSPENSION MAINTENANCE GUIDELINES PREFACE The following Recommended Practice is subject to the Disclaimer at the front of TMC ? s Recommended Maintenance Practices Manual Users are urged to read the Disclaimer before considering adoption of any portion of this Recommended Practice PURPOSE AND SCOPE This Recommended Practice RP provides a system approach to proper adjustment and maintenance of air-ride low-friction suspensions for medium- and heavy- duty trucks This approach is designed to maximize suspension performance This document covers ? Shock types inspection and replacement recommendations ? Air springs and related air components ? Fastener and bushing maintenance for suspensions It also o ?ers maintenance guidelines for torque rods used on Class tractors and straight trucks used in on- highway applications For recommended practices on selection and installation see TMC RP Torque Rod Selection and OEM Installation Guidelines for On-Highway Vehicles REFERENCES DEVINE Project Commercial Vehicle and Highway Dynamics SP- INTRODUCTION During the past years suspensions have evolved from a simple axle-to- frame connection system into sophisticated air-ride systems Air ride suspensions o ?er reductions in tire wear road wear and fuel consumption These suspensions reduce vibration by as much as percent helping to protect sensitive electronics component They also contribute to driver comfort cargo diversity and cargo protection Although today ? s air ride suspensions are considered rather durable system components must be maintained to prevent them from becoming dam- aged misaligned or worn This RP describes air-ride suspension characteristics and minimum maintenance requirements AIR-RIDE COMPONENT DESCRIPTIONS Shock Absorbers ??The shock absorbers ? primary role is to dampen truck and trailer spring oscillation Shocks ? second functional responsibility on many air ride suspensions is limiting axle extension travel Shock absorbers ? roles have changed dramatically in recent years Previously most suspensions had heavy multi-leaf springs with limited travel and a great deal of inherent friction These suspensions quickly self-damped and therefore limited the amount of work the shock needed to perform With today ? s more sophisticated suspensions shocks have become increasingly important to ride control and suspension maintenance Road impact studies Ref as they relate to air ride suspensions indicate that peak forces experienced by tires are reduced in amplitude with air suspensions using properly working shocks Tests also have shown that air ride suspensions with properly working shocks reduce road damage A reduction in related stress also suggests lower maintenance costs Shock Absorber Types Described ? Conventional Hydraulic ??This is the standard original equipment shock design used on Class - commercial vehicles The ow of the uid inside of a shock absorber is typically controlled by recoil and compression valves The uid is forced through the control paths by the motion of the suspension As that occurs the uid heats up The heat is energy that is being removed from the system This process converting energy into heat dampens the motion ? Twin Tube Gas ??Similar to a conventional hydraulic shock The main di ?erence is that the