2
Component Removal and Installation
14
Meritor WABCO
Maintenance Manual 34 (Revised 03-16)
2 Component Removal and Installation
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.
WARNING
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.
Component Replacement
Requirements
Refer to Table B for component replacement requirements. If
necessary, you may also refer to Table D for System Saver Series air
dryer troubleshooting. Before replacing any air dryer component,
verify that the air compressor and air governor are working correctly,
then drain the air tanks. Repair or replace these parts, if necessary.
Check the entire air system for leaks, and repair as necessary.
When draining air tanks before servicing the air dryer, check for
water and/or oil that may have accumulated in the tanks. Water
and/or oil in the air tanks could indicate a problem with the dryer or
compressor.
Table B
Replacement Requirements
Component
When to Replace
Why
Cartridge
Every two to three years for standard dessicant.
Every one to two years for coalescing.
Preventative maintenance.
When compressor is replaced.
Contaminated cartridge.
Water in supply tank.
Saturated or contaminated cartridge, high duty cycle
(wrong application of air dryer).
Bypass Valve (dryers with date
codes earlier than 0894)
Valve leaking, inlet to outlet.
Cut O-ring, bad seat.
Heater Assembly
Water collecting in air dryer is freezing —
electrical power to dryer is O.K.
Heater assembly not working (internal short or open
circuit).
Outlet Check Valve
Air continues to flow from purge valve after
purge cycle, but stops flowing when the
compressor load cycle begins.
Valve is stuck in the open position, or not functioning
properly.
No pressure build-up in system, everything else
is O.K.
Valve is stuck in closed position.
Purge Valve
No purge cycle when compressor unloads —
normal pressure at dryer control port 4 (governor
port).
Valve is stuck in the closed position, or not
functioning properly.
Air flows from purge valve during compressor’s
load cycle — no pressure at dryer control port.
Valve is stuck in the open position, or not functioning
properly.
Pressure Protection Valve
Pressure protection valves will not open (air
dryer must be replaced).
Valves are stuck in closed position.
Summary of Contents for 1200E
Page 4: ...Notes...
