BENDIX BW2077 Manual De Usuario
10
BW2077 © 2007 Bendix Commercial Vehicle Systems LLC All rights reserved. 10/2007 Printed in U.S.A.
METAL
BLACK
RUBBER
FIGURE 7- IDENTIFICATION OF HARD AND SOFT SEAT PURGE VALVES
TROUBLESHOOTING THE AD-IS
®
EVERFLOW
™
ASSEMBLY
Consult the service data sheet, SD-08-2418, for the dryer
used in your AD-IS
®
EverFlow
™
assembly. The service data
sheet contains information that is useful for maintenance
and service of the air dryers.
and service of the air dryers.
1. Excessive dryer purging in the loaded cycle.
• The purge valves in both dryers must have soft-seat
turbo cut-off valves. See Figure 7. Remove the purge
valve an examine the upper window, replace with soft
seat purge valve.
valve an examine the upper window, replace with soft
seat purge valve.
• Excessive pressure (above 175 PSIG) in the
compressor discharge line. Look for obstruction
downstream of the AD-IS
downstream of the AD-IS
®
EverFlow
™
assembly such
as a pinched line or restrictive valve or fi tting.
2. Air dryers do not purge.
• Insuffi cient air pressure in the secondary reservoir.
The EverFlow
™
electronic module will not operate until
air pressure in the secondary tank reaches 75 PSIG.
• The check valve in the AD-IS
®
EverFlow
™
supply line
from the secondary tank is installed incorrectly. Refer
to Figure 2.
to Figure 2.
• The fuse is blown or the air dryer is not connected
to the vehicle electrical system. Check electrical
connection. If the fuse is blown replace the fuse with
a higher amperage fuse. The fuse must be 15 amps
or higher.
connection. If the fuse is blown replace the fuse with
a higher amperage fuse. The fuse must be 15 amps
or higher.
• Incorrect voltage. The air dryer voltage must match
the vehicle voltage. Air dryers with a white heater
connector are 12 volt DC and air dryers with a grey
heater connector are 24 volt DC.
connector are 12 volt DC and air dryers with a grey
heater connector are 24 volt DC.
3. Air brake system will not build air.
• Compressor is undersized.
Some small capacity compressors will not develop
suffi cient air delivery at engine idle to allow proper
operation of the AD-IS
operation of the AD-IS
®
EverFlow
™
assembly and
charge the air brake system. It may be necessary to
upgrade to a compressor with a higher delivery.
upgrade to a compressor with a higher delivery.
4. Water in downstream reservoirs.
• Dryers not purging. See step 2 - Air dryers do not
purge.
purge.
• Desiccant cartridges need to be replaced.
• No pressure protection valve installed downstream
of the air dryers. Refer to Figure 2.
of the air dryers. Refer to Figure 2.
HARD SEAT
SOFT SEAT