BENDIX ATR1DC ANTILOCK TRACTION RELAY Page 6 Manual Download

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FIGURE 9 - PARTIAL ANTILOCK TRACTION SYSTEM SCHEMATIC

BRAKE

VALVE

(SHOWING DELIVERY

LINES ONLY)

AT-1DC

™

ANTILOCK TRACTION ASSY.

(EC-16

™

OR EC-17

™

CONT ATR-1DC

™

VALVE)

MODULATOR

REAR AXLE

BRAKE

REAR AXLE

BRAKE

EXCITER

SPEED SENSOR

EXCITER

SPEED SENSOR

MODULATOR

BRAKE

CHAMBER

ENGINE CONTROL MODULE

(ECM)

TRACTION SWITCH

ANTILOCK DASH LAMP

TRACTION DASH LAMP

RETARDER SWITCH

MODULATOR

Summary of Contents for ATR1DC ANTILOCK TRACTION RELAY

Page 1: ...a cover plate can be installed and the antilock controller mounted elsewhere on the vehicle When an ATR 1DC valve is combined with an antilock traction controller the resulting assembly is referred to as a antilock traction assembly or AT 1DC TheATR 1DC valve replaces the standard relay valve used to control the rear axle service brakes and performs the standard relay function Like the standard re...

Page 2: ... of the antilock system and separate antilock components and their operation is not addressed in this publication For a description of antilock operation refer to the appropriate Service Data Sheet covering the electronic controller used with the ATR 1DC valve e g SD 13 4785 for the EC 16 electronic controller or SD 13 4788 for the EC 17 electronic controller Other useful information on antilock s...

Page 3: ...nse to primary control and seals the air passage leading to the secondary control Air flows past double check valve diaphragm B and through a passage in the cover to the top of the service relay piston In response TRACTION CONTROL SOLENOID SUPPLY PORT SECONDARY SERVICE PORT DOUBLE CHECK VALVE A DELIVERY PORT EXHAUST PORT RELAY PISTON INLET EXHAUST VALVE BLEND BACK PISTON SOLENOID CONNECTOR AIR BAG...

Page 4: ...re above and below the relay piston is equal the piston moves FIGURE 7 SERVICE BRAKES APPLYING PRIMARY CIRCUIT DELIVERY FAILED TRACTION CONTROL SOLENOID SUPPLY PORT SECONDARY SERVICE PORT DOUBLE CHECK VALVE A DELIVERY PORT EXHAUST PORT RELAY PISTON INLET EXHAUST VALVE BLEND BACK PISTON SOLENOID CONNECTOR AIR BAG BRAKE CHAMBER TONE RING EC 16 OR EC 17 CONTROLLER WHEEL SPEED SENSOR PRIMARY SERVICE P...

Page 5: ... control port and primary delivery circuit of the brake valve Air flows past double check valve diaphragm B and through a passage in the cover to the top of the service relay piston In response to air pressure the relay piston drain valve flexes and seals the drain passage leading to the relay exhaust Simultaneously the relay piston moves into contact with the exhaust portion of its inlet and exha...

Page 6: ... AT 1DC ANTILOCK TRACTION ASSY EC 16 OR EC 17 CONTROLLER ATR 1DC VALVE MODULATOR MODULATOR REAR AXLE BRAKE REAR AXLE BRAKE EXCITER SPEED SENSOR EXCITER SPEED SENSOR MODULATOR BRAKE CHAMBER ENGINE CONTROL MODULE ECM TRACTION SWITCH ANTILOCK DASH LAMP TRACTION DASH LAMP RETARDER SWITCH MODULATOR ...

Page 7: ...lve s exhaust port PREVENTIVE MAINTENANCE GENERAL Perform the tests and inspections presented at the prescribed intervals If theATR 1DC valve fails to function as described or leakage is excessive it should be repaired or replaced with a new or genuine Bendix remanufactured unit available at any authorized parts outlet EVERY 3 MONTHS 25 000 MILES OR 900 OPERATING HOURS 1 Remove any accumulated con...

Page 8: ...8 FIGURE 10 ATR 1DC ANTILOCK TRACTION ASSEMBLY EXPLODED VIEW 4 3 5 6 7 8 9 10 11 18 19 21 20 24 23 22 26 25 27 28 29 30 31 15 14 13 17 2 1 16 32 33 38 12 39 34 35 36 37 40 13 ...

Page 9: ...ery port pressure from the 10 psi service pressure to obtain the differential Compare the measured differential with the pressure specified for theATR 1DC valve part number see the l D washer also for the differential NOTE For ATR 1DC valves not incorporating a relay piston return spring 20 the measured differential should be approximately 4 psi When a spring is in use the differential will be hig...

Page 10: ...lve seat 23 with o rings 27 28 Remove o rings 27 28 from the check valve seat 12 Remove the check valve 24 guide 25 and spring 26 13 Remove the inlet seat 29 with o rings 30 31 then remove o rings 30 31 from the inlet sea 29 14 Remove the check valve seat 32 from the valve cover 3 Remove both o ring 33 15 Remove the check valve 34 guide 35 and spring 36 16 Remove the primary inlet seat 37 with o r...

Page 11: ...9 in the body 4 12 Install the large and small diameter o rings 7 8 in the exhaust cover 6 then install the exhaust cover in the body 4 taking care not to damage the o rings Hold the exhaust cover in place 13 While depressing the exhaust cover 6 install the retaining ring 5 in the body 4 Make certain the retainer 5 is fully seated in its groove in the body 14 If the valve was equipped with a relay...

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