STEMCO Aeris Troubleshooting

Aeris System Troubleshooting

Sept 2013

STEMCO Aeris

Troubleshooting Manual

Part Number: 01-571-8301

Revised: 9/13

Rev: A

AerisTM by STEMCO, an advanced automatic tire inflation system based on patented rotary sealing
technology and precision electronic airflow detection. The system is designed to keep commercial trailer
tires properly inflated using air pressure from the trailer’s air system.

AerisTM by STEMCO includes a high resolution electronic flow detection technology capable of informing the
driver whether the system is making a minor adjustment to tire pressure or if a major leak is present. An
additional safety feature is a pressure protection valve to protect the integrity of the air brake system in the
case of a major and continuous air leak such as a blow out or other catastrophic tire failure.

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Aeris System Troubleshooting

Sept 2013

Table of Contents

General View of Aeris Components Installed………………………………………………………3

Explanation of Words………….……………………………………………………………………………..4

Important Safety Notices…..…………………………………………………………………….…………5

General Service Information………….……………………………………………………….………….6

Aeris System Features…………….………………………………………………………………………….7

System Pre Checks…………….……………………………………………………………………………....9

How System Works…………..………………………………………...........................................8

Condition & Possible Causes - Quick Checks…….………………….…………………………..…9

Aeris System Function Test & Troubleshooting.………………………………………………..10

Normal Indication of Driver Warning Lamp……………….……………………………………...17

Notes & Diagrams…..…………………………………………………………………………………….…..18

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Aeris System Troubleshooting

Sept 2013

General Information

General View of Aeris Components Installed

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About This Manual

This manual is provided to support the STEMCO Aeris tire inflation system. The manual provides the
following information needed to service and troubleshoot the Aeris system.

Explanation of Words

Please pay attention to special symbols used through this manual to convey important information.

Hazard signal words such as DANGER, WARNING, CAUTION, or NOTICE are used throughout this
manual. Information accented by these words indicates a point of emphasis and importance. The
following definitions comply with ANSI Z535.4 and indicate the use of signal words as they appear
within this manual.

! DANGER: Indicates immediate hazards which will result in severe personal injury or death.

! WARNING: Indicates hazards or unsafe practices which could results in severe personal injury or

death.

! CAUTION: Indicates a hazardous situation which, if not avoided, could result in minor or

moderate injury.

NOTICE: Indicates hazards or unsafe practices which could result in damage to machine or
equipment.

IMPORTANT: An operating procedure, practice or condition that is essential to emphasize.

! Safety alert symbol used to indicate a condition exists that may result in personal injury or harm to

individuals. It must be applied to DANGER, WARNING and CAUTION statements which emphasize
severity.

IMPORTANT: Please pay special attention to the information supplied in the Explanation of Words
section. These words are used to help prevent immediate hazards, unsafe practices, severe
personal injury or death and damage to machines or equipment.

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Aeris System Troubleshooting

Sept 2013

Important Safety Notices

• Proper maintenance, service and repair are important to the operation and reliability of the trailer

suspension system and its components. The procedures recommended by STEMCO as described in
this manual are methods of performing maintenance, inspection, repair and service. All warnings
and cautions should be read carefully to help prevent personal injury and to help assure proper
installation methods are used.

• Improper maintenance, service and repair can result in personal injury, vehicle damage, property

damage, unsafe operating conditions or void the manufacturer’s warranty.

• Carefully read, understand and follow all safety related information in this manual.

! WARNING: DO NOT modify or rework parts. Use only STEMCO Aeris authorized replacement

parts. Use of substitute, modified or replacement parts not authorized by STEMCO may not meet
STEMCO’s specifications. This may cause the part to fail which could result in loss of vehicle
control and possible personal injury or property damage. Do not modify parts without STEMCO’s
authorized written permission.

! WARNING: Always wear proper PPE when installing and performing maintenance repair, servicing

equipment or cleaning tractor or trailer components.

! WARNING: Solvent cleaners can be flammable, poisonous and can burns or serious injury. To

help avoid serious personal injury, carefully follow the manufacturer’s product instructions and
guidelines. Please follow the procedures below:

• Wear proper eye protection

• Wear proper protective clothing to protect your skin

• Always work in well ventilated area

• Do NOT use gasoline, or solvents that contain gasoline. Gasoline can explode and cause

serious personal injury or death.

• Hot tank solutions or alkaline solutions must be used correctly. Follow the manufacturer’s

product instructions and guidelines.

! WARNING: Avoid creating dust from brakes when cleaning around any brake components. Dust

from brake pads and/or parts are a possible cancer and lung disease hazard.

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Aeris System Troubleshooting

Sept 2013

General Service Information

Before starting any work or installation, read, understand and comply with the following:

• Read all instructions and procedures.

• Company’s service, maintenance, installation and troubleshooting procedures.

• Manufacturer’s vehicle safety instructions when working on the vehicle.

• Manufacturer’s vehicle instructions not detailed in this service manual.

• Follow all local safety regulations and best safety practices when installing.

General Service Installation Notes

• Work must be performed by trained personnel.

• Use all recommended tools required to help avoid personal injury and damage to components.

• Be aware of potential power release of tensioned springs on brake chamber or the brake return

springs. The release of tension can cause injury.

System Overview

• The Aeris tire inflation system is designed to automatically inflate tires that are below the target

pressure setting. The system uses air from the trailer’s compressed air tank. The compressed
air tank pressure setting must be higher than the targeted tire pressure setting. Failure to have
the air tank pressure above the target tire pressure prevents proper operation of the inflation
system.

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