3 Troubleshooting and Testing
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Meritor WABCO Maintenance Manual 34 (Revised 03-16)
3 Troublesho oting and Testin g
Hazard Alert Messages
Read and observe all Warning and Caution hazard alert messages in
this publication. They provide information that can help prevent
serious personal injury, damage to components, or both.
To prevent serious eye injury, always wear safe eye protection
when you perform vehicle maintenance or service.
Remove all pressure from the air system before you
disconnect any component, including the desiccant cartridge.
Pressurized air can cause serious personal injury.
Park the vehicle on a level surface. Block the wheels to
prevent the vehicle from moving. Support the vehicle with
safety stands. Do not work under a vehicle supported only by
jacks. Jacks can slip and fall over. Serious personal injury and
damage to components can result.
NOTE: The pressure protection elements are not serviceable on the
System Saver 1200 Plus with MCP. The entire air dryer needs to be
replaced if these parts are not operating effectively.
Maintenance
To keep your Meritor WABCO air dryer operating efficiently, the
routine maintenance in Table C is recommended.
Table C
Action Interval
Ensure the dryer purges when compressor unloads. Weekly.
Drain the purge tank (dedicated purge tank dryers). Weekly, or as recommended by the manufacturer.
Check for moisture in the system by opening the drain cock on vehicle
system reservoirs slowly.
Weekly, or as recommended by the manufacturer, whichever is
most frequent.
Replace the standard desiccant cartridge. Every two to three years, or more often depending on usage,
vocation, and condition of compressor.
Whenever compressor is rebuilt.
Replace the coalescing cartridge. Every one to two years.
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