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BENDIX AD-9si

BENDIX AD-9si
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1
®
Bendix
®
AD-9si
®
& AD-9si
®
PuraGuard
®
Oil Coalescing Air Dryer
Desiccant
Cartridge
(PuraGuard
®
Oil
Coalescing Shown)
IN 1
Supply From
Compressor
Heater /
Thermostat
Safety Valve
Mounting
Holes
(3 Per Side)
PT 22
Extended
Purge Port
OUT 21
Delivery Ports (2)
SD-08-2433
Purge
Valve
CON 2-4
Unloader To
Compressor
Figure 1 – Bendix
®
AD-9si
®
& AD-9si
®
PuraGuard
®
Oil Coalescing Air Dryer
Governor
(Governor Cut-Out
Pressure Stamped
On Cover)
Delivery
Check Valve
Cover
3
Governor
Exhaust
Bottom
View
Purge
Valve
OUT 21
Delivery Ports (2)
OE and Service New Bendix
®
AD-9si
®
& AD-9si
®
PG air dryers
manufactured after April 2016,
contain two parallel ribs on the
side of each port as shown
here. These ribs identify the
air dryer and/or end cover as a
genuine Bendix
®
product. If the
OE or Service New air dryer or
end cover being serviced was
manufactured after this date and
does not contain these ribs, it is
not a genuine Bendix product.
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BENDIX AD-9si Specifications

General IconGeneral
BrandBENDIX
ModelAD-9si
CategoryDehumidifier
LanguageEnglish

Summary

General Safety Guidelines

Safety Precautions

Essential safety measures to prevent injury or death during vehicle maintenance.

Air Dryer Description and Operation

Function and System Role

Explains the function of the AD-9si air dryer in collecting and removing contaminants.

General Operation Cycles

Introduces the charge and purge cycles of the AD-9si air dryer.

Charge Cycle Process

Details the process of the air dryer during the charge cycle, including air flow and drying.

Purge Cycle Process

Describes the purge cycle, contaminant expulsion, and desiccant regeneration.

Turbo Cut-Off Feature Explanation

Explains the function of the turbo cut-off valve during the purge cycle.

Preventive Maintenance and Service Intervals

Reservoir Draining and Moisture Check

Guidelines for draining reservoirs and checking for moisture, with causes of accumulation.

Cartridge Replacement Recommendations

Recommended service intervals for replacing desiccant cartridges based on usage.

Air Dryer Inspection and Testing

Visual Inspection and Bolt Tightness

Steps for visually inspecting the air dryer for damage and checking mounting bolt tightness.

Operation and Leakage Testing

Procedures for testing air dryer functionality and system leakage.

Heater and Thermostat Testing

How to test the air dryer's heater and thermostat assembly in cold weather.

Air Dryer Service Procedures

Removal Process

Step-by-step guide for removing the Bendix AD-9si air dryer from the vehicle.

Installation Process

Instructions for installing the Bendix AD-9si air dryer onto the vehicle.

Post-Installation Testing

Tests to perform to ensure proper operation after installing the air dryer.

Temporary Air Dryer Bypass

Bypass Procedure and Leak Testing

Steps to temporarily bypass the air dryer and test the system for leaks.

Delivery Check Valve Service

Cleaning and Inspection of Components

Procedure for cleaning and inspecting the delivery check valve components.

Assembly and Reinstallation

Steps for assembling and installing the delivery check valve.

Troubleshooting Common Issues

Symptom-Based Troubleshooting Guide

Common symptoms, causes, and remedies for AD-9si air dryer malfunctions.

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