Table of Contents
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®
®
™
Bendix
AD-SP
Single Check Protection Valve
MOUNTING
HOLES (3)
CONTROL
PORT
HEATER &
THERMOSTAT
CONNECTOR
TURBO
CUTOFF VALVE
FIGURE 1 - AD-SP
™
SYSTEM PURGE AIR DRYER
DESCRIPTION
The function of the AD-SP
collect and remove air system contaminants in solid, liquid
and vapor form before they enter the brake system. It provides
clean, dry air to the components of the brake system which
increases the life of the system and reduces maintenance
costs. Daily manual draining of the reservoirs is eliminated.
The system purge designation is used because the
™
AD-SP
air dryer uses a small portion of system air pressure
from the supply and front axle service reservoirs to perform
the purge or regenerative function. An SC-PR
protection valve or a valve that performs the same function
is always used in conjunction with the AD-SP
protect the service system.
™
The AD-SP
air dryer consists of two major component
groups, a spin off desiccant cartridge assembly and a die
cast aluminum body assembly. The desiccant cartridge is
self contained and serviced as a complete assembly. The
System Purge Air Dryer & SC-PR
EXHAUST PORT
™
System Purge Air Dryer is to
™
single check
™
air dryer to
™
"SPIN OFF"
DESICCANT
CARTRIDGE
MOUNTING
HOLES (3)
SUPPLY
PORT
™
AD-SP
air dryer aluminum body contains the following
serviceable components or assemblies; the turbocharger
cut-off valve, heater and thermostat assembly, delivery check
valve assembly and combined purge and relief valve
assembly. In addition, the non-serviceable purge control
valve is located in the body. All service and replacement
can be accomplished from the exterior of the dryer without
removal from the vehicle. The spin-on desiccant cartridge
is removed and installed using a "strap wrench."
™
The AD-SP
air dryer has three female pipe thread air
connections identified as follows:
Air Connection Port ID Function/Connection
CON 4 ...................... Control Port (purge valve control
SUP 11 .................... Supply Port (air in).
DEL 2 ...................... Delivery Port (air out).
DELIVERY PORT
EXHAUST PORT
& turbo cut-off).
1
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Table of Contents
Related Manuals for BENDIX AD-SP SYSTEM PURGE AIR DRYER
Summary of Contents for BENDIX AD-SP SYSTEM PURGE AIR DRYER
- Page 1 ® ® ™ ™ Bendix AD-SP System Purge Air Dryer & SC-PR Single Check Protection Valve “SPIN OFF” DESICCANT CARTRIDGE MOUNTING HOLES (3) MOUNTING HOLES (3) CONTROL PORT HEATER & THERMOSTAT CONNECTOR TURBO SUPPLY DELIVERY PORT CUTOFF VALVE PORT EXHAUST PORT...
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Page 2: Charge Cycle
GOVERNOR AD-SP ™ DRYER COMPRESSOR REAR AXLE ™ SC-PR SUPPLY VALVE FRONT AXLE DELIVERY PORT SUPPLY PORT (TO FRONT SERVICE (FROM SUPPLY RESERVOIR) RESERVOIR) EMBOSSED PORT EMBOSSED PORT IDENTIFICATION IDENTIFICATION “2 DEL” “1 SUP” FIGURE 2 - AD-SP ™ AIR DRYER SYSTEM DRAWING WITH EXTERIOR AND TOP VIEW OF SC-PR ™... -
Page 3: Valve Operation
DESICCANT PURGE ORIFICE DELIVERY CHECK SEPARATOR REAR RESERVOIR CONTROL PORT DELIVERY PORT TURBO SUPPLY CUTOFF PORT GOVERNOR PURGE PISTON FRONT ™ SC-PR RESERVOIR ENGINE PURGE / VALVE EXHAUST TURBO RELIEF PORT COMPRESSOR VALVE FIGURE 3 - AD-SP ™ AIR DRYER CHARGE CYCLE mechanism or governor malfunctions, at approximately 200 The air dryer will remain in the charge cycle until the air psi supply air pressure the AD-SP... -
Page 4: Purge Cycle/Piston
DESICCANT PURGE ORIFICE DELIVERY CHECK SEPARATOR REAR RESERVOIR CONTROL PORT DELIVERY PORT TURBO SUPPLY CUTOFF RESERVOIR GOVERNOR PURGE PISTON FRONT ™ SC-PR RESERVOIR ENGINE EXHAUST PURGE / VALVE TURBO PORT RELIEF COMPRESSOR VALVE ™ FIGURE 5 - AD-SP AIR DRYER PURGE CYCLE PURGE PISTON PURGE CYCLE (refer to Figure 5) -
Page 5: Sc-Pr Valve Description/Operation
™ FIGURE 6 - SC-PR VALVE CHARGE POSITION* assembly. Its primary use is in conjunction with the Bendix ® ™ AD-SP air dryer and is installed in the front axle... -
Page 6: Purging
When supply pressure reaches 100 psi, the diaphragm moves away from its seat and air entering the supply port flows through the pressure protection valve portion, as well as the single NORMAL PURGE check valve portion, and into the front axle service reservoir. The pressure protection valve remains open as long as DIAPHRAGM supply pressure remains above 95 psi. -
Page 7: Operation & Leakage Tests
D. A single check valve, or a device with a check valve D. With a plug installed in the delivery port, 0 psi in the feature, may have been installed to the inlet port of control port, and 120 psi applied to the supply port, the supply tank or in the delivery line between the apply a soap solution to the purge exhaust port. -
Page 8: Exploded View
DESICCANT CARTRIDGE CONTROL PORT ™ AD-SP PISTON DRYER BODY O-RINGS RETAINING RING DELIVERY PORT RETAINING RING SUPPLY PORT PURGE VALVE O-RING CONNECTOR HEATER & THERMOSTAT O-RING ASSEMBLY PURGE PISTON SPRING EXHAUST COVER RETAINING RING ™ FIGURE 8 - AD-SP SYSTEM PURGE AIR DRYER EXPLODED VIEW A. -
Page 9: Disassembly
® ™ 8. Use only genuine Bendix replacement parts, REPAIRING THE AD-SP AIR DRYER GENERAL components and kits. Replacement hardware, If, after completing the routine operation and leakage tests, tubing, hose, fittings, etc. must be of equivalent it has been determined that one or more components of the... -
Page 10: Cleaning/Inspection/Assembly Preparation
1. Lubricate the piston o-ring with a silicone grease only, 4. Remove the o-ring from the heater connector. such as those packaged with Bendix maintenance kits. DISASSEMBLY - DESICCANT CARTRIDGE Also lubricate completely around the outside edge of the purge valve. -
Page 11: Installation
When clockwise approximately one full turn. If necessary, vehicles of this type are encountered other Bendix air dryer place a strap wrench or equivalent tool on the desiccant models must be used. Consult your local authorized Bendix cartridge next to the lip low on the cartridge. -
Page 12: Vehicle Preparation
When vehicles of this type are cock in the reservoir shell. The most common is a encountered other Bendix air dryer models must be used. two compartment reservoir with a "built-in" single Consult your local authorized Bendix parts outlet or sales check valve between the two compartments. - Page 13 ™ 3. Do not locate the AD-SP air dryer near heat producing components such as the vehicle exhaust and make certain adequate clearance from moving components WIDTH (THICKNESS) (e.g. drive shaft, suspension, pitman arm, etc.) is ™ OF AD-SP AIR DRYER provided.
- Page 14 A. If the AD-SP air dryer is replacing an integral purge air ® ™ dryer, such as the Bendix AD-9 air dryer, on a vehicle equipped with any compressor except the Cummins- Holset type E & QE, all that is necessary is that the air dryer be removed and the existing air lines be correctly ™...
- Page 15 2. A separate wire harness and splice kit is with all ™ AD-SP air dryer replacements and retro-fit kits. Refer (A) Total air system leakage (See Bendix publication to the instructions contained in that kit for the proper BW-5057 "Air Brake Handbook"). wiring procedure.
- Page 16 ™ AD-SP AIR DRYER TROUBLESHOOTING CHART REMEDY SYMPTOMS CAUSE 1. Dryer is constantly A. Excessive system A. If leakage IS SHOWN on gauges test for “cycling” or purging. leakage. excessive service brake system leakage. Dryer purges frequently IMPORTANT: Note whether Allowable leakage: (every 4 minutes or less air pressure loss is shown...
- Page 17 ™ AD-SP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE 1. Test fittings, hoses, lines and connections. Apply soap solution to detect excessive leakage. Tighten or replace as needed then repeat the air dryer charge-purge cycle and observe the gauge installed in the supply reservoir.
- Page 18 ™ AD-SP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE ™ B. Leaking (internal or B. Locate the SC-PR valve on the front axle ™ external) SC-PR single service (secondary) reservoir and replace. check protection valve. C. Incorrect governor setting C.
- Page 19 Consult your suspension, additional air local authorized Bendix parts outlet or sales accessories, use of an representative for additional information. undersized compressor,...
- Page 20 Test the compressor using the BASIC cup method as described in the Bendix compressor service manual and referred to in Appendix A, Table A, column 5.
- Page 21 ™ AD-SP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE 3. Oil present at air dryer A. Air brake charging A. Air dryers remove water and oil from the air purge exhaust or system is functioning brake charging system. A small amount of oil is cartridge during normally.
- Page 22 ™ AD-SP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE 6. Unable to build air A. Frozen discharge line. A. Inspect discharge line installation for water traps system pressure. Air that could freeze. Refer to “Connecting The Air not escaping from Lines”...
- Page 23 ™ AD-SP AIR DRYER TROUBLESHOOTING CHART (Continued) REMEDY SYMPTOMS CAUSE A. This symptom is almost 9. Desiccant material A. See related Remedies for Causes under always accompanied by being expelled from air Symptoms 1, 2, 3, 4 and 6*. one or more of dryer purge valve Symptoms 1, 2, 3, 4, exhaust (may look like...
- Page 24 250,000 miles. covered under warranty. Note: To help prevent discharge line freeze-ups, shorter discharge line lengths or insulation may be required in cold climates. (See Bendix Bulletins TCH-08-21 and TCH-08-22, included in Appendix B, for more information.) 5 For certain vehicles/applications, where turbo-charged inlet air is used, a smaller size...
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Page 25: Additional Troubleshooting Information
The troubleshooting procedure presented on the following pages has been excerpted from a laminated card entitled: Troubleshooting Charging and Air Supply Systems. The complete card can be obtained from authorized Bendix parts outlets under literature number BW1779. It is presented here because of the air dryers connection to the supply air system and for convenience. - Page 28 BW1777 © 2004 Bendix Commercial Vehicle Systems LLC All rights reserved. 10/2004 Printed in U.S.A.