1 Introduction
1
Meritor WABCO Maintenance Manual 34 (Revised 03-16)
1 Introduction
Overview
Maintenance Manual 34 contains troubleshooting steps and service
information for the Meritor WABCO System Saver Series (1200 and
1800) single cartridge air dryers.
NOTE: If you have a System Saver TWIN air dryer, use Maintenance
Manual 35, Meritor WABCO System Saver TWIN Air Dryer. To obtain
this publication, refer to the Service Notes page on the front inside
cover of this manual.
Other Publications Related to Meritor WABCO
System Saver Series Single Cartridge Air
Dryers
TP-92116, Installing the Meritor WABCO System Saver Series Air
Dryer, provides complete installation instructions.
PB-8857AS contains a complete listing of air dryer replacement
parts.
TP-97101 is a troubleshooting guide. There is also a poster-sized
troubleshooting guide, TP-9772, available.
TP-9672, Air Dryer Application Guide, provides an in-depth look at
System Saver Series air dryer applications.
T-20102V, Air System Troubleshooting video Stopping With Air and
T-97105V, System Saver 1200 videotapes are also available.
TP-1033, System Saver 1200 Plus Series Air Dryers, provides
installation instructions.
TP-1343, Troubleshooting and Repairing System Saver 1200 Plus
Air Dryers with Turbo Cut-off Valves on Vehicles with Cummins
Engines, provides service instructions.
TP-09133, Replacing a Bendix AD9 Air Dryer with a System Saver
1200 Plus Air Dryer, provides replacement instructions.
TP-0579, Installation Instructions for Meritor WABCO’s Dessicant
Cartridge Replacement Kit, provides installation instructions.
TP-9610, Using an Alcohol Evaporator with Meritor WABCO System
Saver 1000, 1200, and 1200 E Series Single Cartridge, provides air
dryer instructions.
TP-9557, Pressure Relief Valve Installation Instructions for Meritor
WABCO System Saver 1000, 1200 and 1200E Series and System
Saver TWIN Air Dryers, and Modification Instructions for Units
Equipped with Alcohol Evaporators, provides installation
instructions.
To order literature, visit our website at meritorwabco.com.
Air Dryer Identification
Alphabetical designations of the System Saver Series family of air
dryers have specific meanings:
P Indicates an external purge tank is used for desiccant
regeneration
U Indicates discharge line — unloaded compressor
E Indicates a Holset style compressor function
G Indicates integral governor for air compressor control
UP Indicates discharge line — unloaded compressor (with external
purge tank)
System Saver 1200/1800: System regeneration valve assembly on
side of dryer
System Saver 1200E: Tubing and banjo fitting at front of dryer
System Saver 1200P/1800P: Uses dedicated purge tank. Port 22
drilled and tapped
System Saver 1200U/1800U: Small regeneration hole visible in
back of Port 1 when fitting is removed. No spring in turbo cut-off
valve assembly.
System Saver 1200UP/1800UP: Port 22 drilled and tapped. Small
regeneration hole visible at back of Port 1 when fitting is removed.
No spring in turbo cut-off valve assembly. Dedicated purge tank.
The air dryer base is the same for both the 1200 and 1800 Series
air dryers, however the 1800 Series canister is 3.2 inches taller
than the 1200. This larger canister contains 50% more desiccant,
which makes the 1800 ideal for applications calling for frequent
starts, stops and long compressor cycles. System Saver 1200 and
System Saver 1800 Series air dryers are illustrated in Figure 1.1.
System Saver 1200P and System Saver 1800P, which are used with
a dedicated purge tank, are illustrated in Figure 1.2.
System Saver 1200 Plus: Has the governor integrated into the
body of the air dryer and also has an integrated purge tank.
Figure 1.3.
System Saver 1200 Plus MCP: Has the governor and pressure
protection elements integrated into the body of the air dryer. Also
has an integrated purge tank. Figure 1.4.
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