BENDIX BW1450 manual AD-4AIR Dryer Troubleshooting Chart

Page 21

AD-4™AIR DRYER TROUBLESHOOTING CHART (Continued)

 

SYMPTOMS

CAUSE

REMEDY

8.

Desiccant material being

A. This symptom is almost

A. See Causes and Remedies for Symptoms 1, 2,

 

expelled from air dryer

always accompanied by

3, 4 and 5.

 

purge valve exhaust

one or more of

 

 

(may look like whitish

Symptoms 1, 2, 3, 4 and

 

 

5. See related causes for

 

 

liquid or paste or small

 

 

these Symptoms above.

 

 

beads.)

 

 

B. Air dryer not securely

B. Vibration should be held to minimum. Add

 

- OR -

 

mounted. (Excessive

bracket supports or change air dryer mounting

 

Unsatisfactory desiccant

 

vibration.)

location if necessary.

 

life.

 

 

 

C. Malfunctioning or

C. Replace desiccant cartridge assembly.

 

 

 

 

saturated desiccant

 

 

 

cartridge.

 

 

 

 

 

 

 

D. Compressor passing

D. Check for proper compressor installation; if

 

 

excessive oil.

symptoms persist, replace compressor.

 

 

 

 

 

 

E. Desiccant cartridge not

E. Check the torque on the desiccant cartridge

 

 

assembled properly to

to end cover attachment. Refer to assembly

 

 

end cover. (Loose

section of this data sheet.

 

 

attachment)

 

 

 

 

 

9.

“Pinging” noise

A. Single cylinder

A. A slight “pinging” sound may be heard during

 

excessive during

compressor with high

system build up when a single cylinder

 

compressor loaded

pulse cycles.

compressor is used. If this sound is deemed

 

cycle.

 

objectionable, it can be reduced substantially

 

 

 

by increasing the discharge line volume.

 

 

 

This can be accomplished by adding an

 

 

 

additional four feet of discharge line or adding a

 

 

 

90 cubic inch reservoir between the compressor

 

 

 

and the AD-4™air dryer. IMPORTANT: Do not

 

 

 

exceed the line lengths requirements specified

 

 

 

in this manual.

10. Constant seepage of air

A. Defective check valve

A. Refer to Remedy C, Symptom #1.

 

at air dryer purge valve

assembly in AD-4™air

 

 

exhaust (non-charging

dryer end cover.

 

 

mode.)

 

 

 

B. Leaking Turbo Cutoff

B. Repair or replace purge valve assembly.

 

 

valve.

 

 

 

 

 

 

 

C. Leaking purge valve

C. Repair or replace purge valve assembly.

 

 

control piston o-ring.

 

 

 

 

11. The air dryer purge

A. Compressor fails to

A. Faulty governor installation; no air line from

 

piston cycles rapidly in

“unload”.

governor to compressor or line is kinked or

 

the compressor

 

restricted. Install or repair air line.

 

unloaded (non-

 

 

 

compressing) mode.

 

 

 

 

 

 

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Contents Port l.D Function/Connection DescriptionOperation of the AD-4AIR Dryer Charge Cycle refer to FigurePurge Cycle refer to Figure AD-4AIR Dryer Purge Cycle Preventive MaintenanceAD-4AIR Dryer Sectional View Operation & Leakage Tests Every 10,800 hours or 300,000 miles or 36 monthsRebuild the air dryer including the desiccant cartridge Maintenance Kits Available Rebuilding the AD-4AIR DryerGeneral AD-4AIR Dryer Assembly AD-4AIR Dryer Removal DisassemblyAssembly Cleaning & InspectionThermostat Disassembly Refer to Figures Total Vehicle Reservoir Volume Requirement RE-INSTALLATIONRetrofitting the AD-4AIR Dryer Vehicle Application RequirementsConnecting the AIR Lines All electrical connections must be waterproofed Testing the AD-4AIR DryerPresented AD-4AIR Dryer Troubleshooting ChartAD-4AIR Dryer Troubleshooting Chart Pressure should not drop below Cut-In pressure With gauge installed at RES port of governorAt the onset of the compressor Unloaded Cycle. If pressure drops, check for kinks orUnloaded for a minimum of 30 seconds. This How to help prevent discharge line freeze-ups, see Points where ice may form and block the flow. IfEngine air filter and service if necessary if Possible, check the air filter usage indicatorAD-4AIR Dryer Troubleshooting Chart Preventative Maintenance Section AD-4AIR Dryer Troubleshooting Chart High Air Use Low Air UseConventional Supply System & Integral Purge AIR Dryer Additional Troubleshooting InformationHolset Type E & QE Compressor with Econ Valve Holset Type E & QE Compressor W/O Econ Valve

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