BENDIX TCH-008-012 User's Manual
Contents
1. Technical Bulletin Bulletin No PRO 08 12 Effective Date 5 31 94 Cancels PRO 08 12 dated 3 1 91 Page 1 of 5 Subject Air Dryer Installations European Vehicles W Compressor Discharge Line Unloader System Attachments Schematics for AD 2 AD 4 amp AD 9 THIS BULLETIN CONTAINS REVISED INFORMATION AND SUPERSEDES ALL PREVIOUS BULLETINS ON THE SAME SUBJECT The Bendix AD 2 AD 4 and AD 9 DLU Discharge Line Unloader Air Dryers CAN be installed on European and other overseas vehicles that utilize a Discharge Line Unloader Valve instead of the domestic type Governor and compressor Unloader mechanism IMPORTANT AD 2 Any AD 2 Air Dryer part number may be used in the attached AD 2 installation schematic AD 4 Any AD 4 Air Dryer part number may be used in the attached AD 4 installation schematic AD 9 Only part numbers 065499 12v heater and 065605 24v heater may be used in the attached AD 9 DLU installation schematic These part numbers were released in 1994 for this specific purpose Only these AD 9 DLU part numbers may be used for this installation They are identified with the letter U embossed in the metal on the flat area next to the heater and thermostat connector and with a metal identification tag installed under one of the end cover nuts AD 9 Discharge Line Unloader Modelis are Identified with a U Front View Gade Side View Partial view of the Purge Valve assembly for AD 9 for Discharge Line Unloa2. oun Argu COMPRESSOR MUST BE REMOVED TO AIR SYSTEM AD 4 Air Dryer Piping Details x ege Z e TUBING CONNECT TO UNL U S PORT op GOVERNOR AND CON PORT OF AD Au DRYER vw U S TUBING MUST BE CONNECTED TO 4 T NPT x We US TUES FTG DOERR AIR DRYER OUTLET a wN NPT x EITHER ISMA METRIC OR k 4 U S TUBE FTG ON D d en aa Bo D wm Kat A vw NPT To Ye NPT REDUCER BUSHING BE t O NIPPLE T et METRIC on G n PIPE T TEE EI n npr x EITHER 15MM METRIC FROM fe OR U S TUBE FTG a COMPRESSOR oN TO SUPPLY RES IMPORTANT THE DISCHARGE LINE UNLOADER VALVE MUST BE REMOVED FOR AIR DRYER TO FUNCTION PROPERLY a Typical Discharge Line Unloader System Without An Air Dryer Discharge Line Unioader Valve Supply Reservoir Wet Tank Supply Reservoir Wet Tank Discharge Line Unloader Valve Must Be Removed AD 9 DLU AIR DRYER Part Numbers N 065499 12v D 2 Governor 065605 24v 1 4 x1 4 U S Tubing Fitting 1 4 x1 4 U S Tubing Fitting 1 4 x1 4 U S Tubing Fitting 1 2 x1 4 Reducer Bushing 1 2 Pipe thrd by either 15mm or 5 8 U S Tubing Fitting O OS wech Reservoir From CY i mA Compressor y 1 2 Pipe thrd by either 15mm or 5 8 ZON U S Tubing Fitting IMPORTANT The Discharge Line Unloader Valve must be removed for the AD 9 DLU Air Dryer to function properly
3. der system The discharge line unloader valve which is generally located just ahead of the first reservoir the wet tank must be removed An air dryer and D 2 governor can then be installed per our instruction and they will perform the compressor unloading function formerly provided by the discharge line unloader valve Attached are partial schematics detailing the piping of the air dryer and governor combination along with the metric fittings required to complete the installation Installing the air dryer and governor on a single mounting plate allows the use of U S fittings and tubing for the control and sensing lines for the governor and air dryer Only two Metric fittings if any are required to install the air dryer in the compressor discharge line The fittings shown on the attached schematics would allow Metric air lines to be connected to devices with U S pipe threads On some overseas vehicles U S tubing sizes are used but the fittings have Metric pipe threads Mack Midliners MS 20 are examples of this In this case the fittings needed to install the air dryer and governor combination can be standard U S fittings since the discharge line is 5 8 O D tubing and the pipe threads in the AIR DRYER are U S Metric fittings are not currently available from T B S however several of the large fittings manufacturers have complete catalogs and listings along with conversion fittings Page Sone Typical Discharge Line Unloader Syst
4. em Without an AD 2 Air Dryer Installed DISCHARGE LINE UNLOADER VALVE COMPRESSOR sam IA ZN Typical AD 2 Air Dryer System With Discharge Line Unloader Valve Removed DISCHARGE LINE UNLOADER VALVE COMPRESSOR MUST BE REMOVED SUPPLY TO RESERVOIR AIR WET TANK SYSTEM AD 2 Air Dryer Piping Details TO SUPPLY RES WET TANK EXISTING VEHICLE DISCHARGE LINE MAY BE EITHER 15MM METRIC OR U S 3 vw U S TUBING MUST BE Ya NPT x Ye U S CONNECTED TO GOVERNOR Ya NPT x EITHER TUBE FITTING RES PORT AND 2 PIPE 1SMM METRIC OR TEE AT AIR ORYER OUTLET U S TUBING FITTING wa TO Ve NPT ome uae REDUCER BUSHING c vw PIPE TEE A l W NPT x a U S TUBE FTG 2 PIPE NIPPLE FROM COMPRESSOR See ae D 2 GOVERNOR aS ee va U S TUBING CONNECTED EXISTING VEHICLE y2 NPT x EITHER ad Ce ee eee ales TO UNL PORT OF GOVERNOR DISCHARGE LINE MAY BE 15MM METRIC OR EE AND AIR ORYER CONTROL PORT EITHER 15MM Ge OR U S TUBE FITTING e LS aa Ye NPT x Ya U S TUBE FTG IMPORTANT THE DISCHARGE LINE UNLOADER VALVE MUST BE REMOVED FOR AIR DRYER TO FUNCTION PROPERLY Page 4 oi Typical Discharge Line Unloader Valve System Without an AD 4 Air Dryer Installed DISCHARGE LINE UNLOADER VALVE COMPRESSOR SUPPLY RESERVOIR TO WET TANK AIR m SYSTEM Typical AD 4 Air Dryer System With Discharge Line Unloader Valve Removed
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