BENDIX BW1969 User's Manual
Contents
1. BP R1 AR 1 amp ATR 1 valves The internal components of the relay portion of all of these valves are similar and in many cases interchangeable with the R 12 valve and therefore the same basic components are used to service all of them The ATR 1DC valve is available with various crack pressures to accommodate specific applications however the standard is 4 psi achieved without any added spring OPERATION GENERAL While the ATR TDC valve is an antilockc traction relay valve its true function is that of an air brake relay valve Because the ATR 1DC is essentially a relay valve with a traction control function the following description of operation describes its operation as a relay valve and its function in the traction control system The full operation 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 system components may be downloaded from www bendix com For example 50 13 4793 M 21 and M 22 antilock modulators 50 13 4870 M 32 and M 32QR antilock modulators SD 13 4754 WS 20 wheel speed sensors and SD 13 4860 WS 24 wheel speed sensors SERVIC2. RING CONTROLLER 505000050 ya lt L7 RELEASED SOLENOID CONNECTOR BLEND Back AR BAG PISTON A SERVICE PORT pouste CHECK VALVE cet ite we seta oston 6 c 4 BRAKE CHAMBER WHEEL SPEED SENSOR FIGURE 6 SERVICE BRAKES RELEASING 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 exhaust valve With the exhaust passage sealed continued movement of the piston unseats the inlet portion of the inlet and exhaust valve allowing supply air from the reservoir to flow out the ATR 1DC valve s delivery ports to the brake chambers SERVICE BRAKES HOLDING Air pressure being delivered to the brake chambers is also present beneath the relay piston When air pressure above and below the relay piston is equal the piston moves Rr TRACTION CONTROL SOLENOID SECONDARY SERVICE i INLET EXHAUST Tae EXHAUST PORT DELIVERY PORT T sowe 00001 00000 DELIVERY AIR PEORES RO E sio sack TET WAS UE ain pas H FAILURE pove atte v pU 7 B ov ov Y ov RELAY PISTON E Leet m sunw eor ciiin WHEEL SPEED SENSOR FIGURE 7 SERVICE BRAKES APPLY
3. SD 13 4811A Bendix ATR 1DC AntiLock Traction Relay Valve SOLENOID MOUNTING HOLES 4 CONTROL REVERSE iu ANGLE VIEW PORT wn nue 2 PORT 4 REMOTE MOUNT ATR 1DC VALVE DESCRIPTION The ATR 1DC antilock traction relay valve is a specialized air brake valve developed for use on Bendix antilockitraction equipped vehicles The ATR 1DC valve can be used on straight trucks buses and tractors Although this valve in combination with the appropriate controller can be used any Bendix antilock traction equipped brake system it was developed for use in systems that were builtto comply with Federal regulations effective 3 1 98 Itis a combination of four separate valves working in a single housing A Bendix R 14 service relay is the base valve fitted with a modified cover containing two double check valves and a traction control solenoid In addition the ATR IDC valve also incorporates a relay piston drain which continually allows system contamination to be drained from the relay exhaust port Refer to Service Data Sheet for more information FIGURE 1 ATR IDC ANTILOCK TRACTION RELAY VALVE 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 The ATR 1DC valve replaces the standard
4. above the relay piston pressure beneath lifts the piston away from the exhaust valve and opens the exhaust passage Air from the service brake chambers returns to the ATR 1DC valve and flows out the open exhaust SERVICE BRAKES APPLYING PRIMARY CIRCUIT FAILED In the event the rear axle delivery line from the brake valve is broken air from the brake valve s front axle delivery circuit will enter the secondary control port Secondary control pressure flexes double check valve diaphragm A causing itto seal the air passage leading to the solenoid and opening the passage leading to double check valve B Double check valve diaphragm flexes in response to secondary control pressure and seals the air passage leading to the primary 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 exhaust With the exhaust passage sealed continued movement of the piston unseats the inlet portion of the inlet and exhaust valve allowing supply air from the reservoir to flow outthe ATR 1DC valve s delivery ports to the brake chambers TRACTION CONTROL SERVICE APPLICATION GENERAL
5. or line containing pressure it may whip Never remove a component or plug unless you are certain all system pressure has been depleted 8 Use only genuine Bendix replacement parts components and kits Replacement hardware tubing hose fittings etc must be of equivalent size type and strength as original equipment and be designed specifically for such applications and systems 9 Components with stripped threads or damaged parts should be replaced rather than repaired Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer 10 Prior to returning the vehicle to service make certain all components and systems are restored to their proper operating condition 11 For vehicles with Antilock Traction Control the ATC function must be disabled ATC indicator lamp should be ON prior to performing any vehicle maintenance where one or more wheels ona axle are lifted off the ground and moving OPERATION amp LEAKAGE TESTS GENERAL A change in vehicle braking characteristics or a low pressure warning may indicate a malfunction in one or the other brake circuit and although the vehicle air brake system may continue to function the vehicle should not be operated until the necessary repairs have been made and both braking circuits including the pneumatic and mechanical devices a
6. relay valve used to control the rear axle service brakes and performs the standard relay function Like the standard relay valve it replaces the ATR 1DC valve sometimes with attached antilock controller is normally mounted near the service brakes it serves A mounting bracket furnished with the valve permits either frame or cross member mounting All air connections on the ATR 1DC valve are identified with cast embossed letters for ease of identification and installation The letter identification and airline connections are shown below for reference The ATR 1DC valve contains both air and electric EMBOSSEDATR 1DC AIR CONNECTION BENT components to provide the service braking and traction Supply to reservoir sue control differential braking functions The traction function Delivery brake Chamber DEL of the ATR 1DC valve is enhanced to allow coordination Primary Control to brake valve rear delivery 41 with the air suspension system of a 6x2 vehicle Secondary Control 42 to brake valve front delivery ABendix antilock traction controller such as the 16 Optional Au 2 EC 17 can be mounted to the ATR I DC valve or a cover onnected 10 al suspension control EC 16 CONTROLLER ATRADC ANTILOCK TRACTION RELAY VALVE FIGURE 2 TYPICAL AT IDC ANTILOCK TRACTION ASSY The ATR 1DC valve is part of the R 12 family of relay valves which includes the R 12 R 14
7. retur spring 9 in the body 4 12 Install the large and small diameter o rings 7 amp 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 18 While depressing the exhaust cover 6 install the retaining ring 5 in the body 4 Make certain the retainer 6 is fully seated in its groove in the body 14 Ifthe valve was equipped with a relay piston return spring 20 install the spring in the body large diameter frst O RING IDENTIFICATION Key Description ly 1D 00 7 O Ring 1 1424 1 630 0 108 8 O Ring 1 0 862 1 068 0 103 18 O Ring 1 3 487 3 693 0 103 21 O Ring 1 3 234 3512 0 139 27 O Ring 1 1 362 1 568 0 103 28 O Ring 1 1 114 1254 0 070 30 O Ring 1 1 356 1496 0 070 31 O Ring 1 1 176 1316 0 070 33 O Ring 1 1176 1316 0 070 O Ring 1 1 176 1316 0 070 39 O Ring 1 0 801 0 941 0 070 40 O Ring 1 0739 0 879 0 070 15 Using lubricant to hold them in place install the large and small sealing rings 18 amp 17 on the cover 3 16 Install the o ring 21 on the relay piston 19 then install the piston in the body 4 17 Note the relationship marks made prior to disassembly then install the cover 3 on the body 4 Secure the cover on the body using the two short cap screws 16 Again noting the relationship marks secure the bracket 15 on the cover 3 and body 4 and using the two long cap
8. screws 12 and two nuts and washers 13 Torque the four cap screws to 120 to 150 Ib in 18 Install the two cap screws 14 that secure the bracket 15 to the cover 3 and torque to 180 220 pound inches 19 Noting the relationship marks made during disassembly secure the controller 1 or cover plate to the cover 3 using the four cap screws 2 Torque the four cap screws to 50 80 pound inches 20 Install all air line fittings and plugs making certain thread sealing material does not enter the valve Install the rebuilt valve on the vehicle and perform the OPERATION AND LEAKAGE TESTS before placing the vehicle in service n 12 BWi969 2004 Bendix Commercial Vehicle Systems LLC All rights reserved 9 2004 Printed in U S A
9. E BRAKES APPLYING Reservoir air pressure is present at the supply port SUP and at the relay inlet and exhaust valve Reservoir air pressure also flows from the supply port through internal ECIG OR CONTROLLER TRACTION CONTROL SOLENOID SECONDARY SERVICE PORT BRAKE VALVE RELAY PISTON RELAY SPRING if USED RESERVOIR SUPPLY PORT EXHAUST PORT INLET EXHAUST VALVE ee SHOWING NUN fm ees SURE EU TT A amar PI WHEEL SPEED SENSOR DOUBLE CHECK VALVES DELIVERY PORT FIGURE 3 SECTIONAL ANTILOCK TRACTION ASSEMBLY 2 con ecar TRACTION CONTROL SOLENOID sthvice PORT BRAKE VALVE Ele OR ECIT rr CONTROLLER f 0000900000 LINES ONLY _ m CONECTOR 9 g BLEND BACK AR BAG PISTON PRIMARY SERVICE PORT DOUBLE B X RELAY PISTON t om A cz sur chen 1 DELWERY ILETENHAUST ToT PORT SPEED FIGURE 4 SERVICE BRAKE APPLICATION body and cover passages to the supply of the normally closed NC traction control solenoid Brake application air from both the rear and front axle circuits of the brake valve enters the ATR 1 DC valve s primary and se
10. ING PRIMARY CIRCUIT DELIVERY FAILED 4 SECONDARY econ eca TRACTION CONTROL SOLENOID SERES nave vave CONTROLLER 00007 00000 DELIVERY AIR n 0 gt LMES ONL cometon E PISTON PRIMARY De SERVICE PORT ova z i pouse etie oe Re ue staret Th P h E 2 sur eon 77 DELIVERY ILETEAWAUST OT Cn TONE RING WHEEL SPEED FIGURE 8 TRACTION CONTROL BRAKE APPLICATION slightly allowing the inlet valve to return to its seat The exhaust valve remains closed With both the inlet and exhaust valves closed air pressure in the brake chambers is held constant and neither increases nor decreases SERVICE BRAKES RELEASING When the brake application is released air from above the relay piston flows back to and past double check valve and returns to the exhaust of the brake valve Air on the other side of double check valve B and from double check valve A also returns to the exhaust of the brake valve As air pressure above the relay piston is released the natural resilience of the relay piston drain valve causes it to return to its original position which opens the drain passage in the relay piston With the piston drain open gravity allows contamination to flow out the relay valve exhaust As air pressure is reduced
11. R DEATH When working on or around a vehicle the following general precautions should be observed at all times 1 Park the vehicle on a level surface apply the parking brakes and always block the wheels Always wear safety glasses 2 Stop the engine and remove ignition key when working under or around the vehicle When the engine compartment the engine should be shut off and the ignition key should be removed Where circumstances require that the engine be in operation EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving rotating leaking heated or electrically charged components 3 Do not attempt to install remove disassemble or assemble a component until you have read and thoroughly understand the recommended procedures Use only the proper tools and observe all precautions pertaining to use of those tools 4 Ifthe work is being performed on the vehicle s air brake system or any auxiliary pressurized air systems make certain to dra pressure from all reservoirs before beginning ANY work on the vehicle If the vehicle is equipped with an AD IS dryer system or a dryer reservoir module be sure to drain the purge reservoir 5 Following the vehicle manufacturer s recommended procedures deactivate the electrical system in a manner that safely removes all electrical power from the vehicle 6 Never exceed manufacturer s recommended pressures 7 Never connect or disconnect a hose
12. While under the control of an antilock traction controller the ATR 1DC valve s solenoid is able to initiate a brake application that allows the traction system to control wheel spin during acceleration under 25 mph When wheel spin is detected and the vehicle is stopped or moving at any speed up to 25 mph the antilock traction controller instantly energizes the solenoid in the ATR 1DC valve which then applies air to each of the rear axle modulators as shown in Figure 8 The modulators are also equipped with solenoid valves and because the controller also controls them the solenoid valves in the appropriate modulator are opened and closed to gently pump the brake on the spinning wheel only This brake application to the spinning wheel forces the differential to drive the stationary or slowly spinning wheel 5 sin AMAT AMA ie M GANA DOTAN YO ASSY HOLS FIGURE 9 PARTIAL ANTILOCK TRACTION SYSTEM SCHEMATIC The ATR DC valve also has an auxiliary control port that permits coordination of the traction function with an air suspended tag axle on a 6x2 vehicle The auxiliary control port 21 connects to the air suspension control valve traction event occurs and the tag axle is down and loaded the ATR 1DC valve is able to reduce air pressure in the tag axle air bags Lowering pressure in the tag axle air bags incr
13. and or malfunction If a vise is to be used position the valve so that the jaws bear on the supply ports on opposing sides of the valve body 1 Remove and retain the four cap screws 2 that secure the electronic controller 1 to the cover 3 then separate and retain the controller 1 from the cover 3 Note In some instances a controller 1 will not be present and only a cover plate will be noted Remove the cover plate in the same manner described for the controller 2 While holding the exhaust cover 6 remove the retaining ring 5 that secures it to the body 4 3 Remove the exhaust cover 6 along with both o rings 788 4 Remove the valve spring 9 valve retainer 10 and the valve assembly 11 from the body 4 5 Remove and retain the two long cap screws 12 and nuts 13 that secure the cover 3 to the body 4 6 Remove and retain the two cap screws and lock washers 14 that secure the bracket 15 to the cover 4 then remove and retain the bracket 7 Remove and retain the two short cap screws 16 that secure the cover 3 to the body 4 8 Separate the cover 3 from the body 4 then remove the sealing ring 17 and o ring 18 9 Remove the relay piston 19 and relay piston spring 20 from the body 4 NOTE The relay piston spring item 20 is not used in all valves 10 Remove the o ring 21 from the relay piston 19 11 Remove the retaining ring 22 Then remove check valve
14. condary control ports Secondary control pressure flexes double check valve diaphragm A causing it to seal the air passage leading to the solenoid and opening the passage leading to double check valve B Primary control air flows to double check valve diaphragm B Because primary control pressure from the foot valve is 2 to 4 psi greater than secondary control double check valve diaphragm B flexes in response 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 SECONDARY ace on ec TRACTION CONTROL SOLENOID SERVCEPORT BRAKE VALVE CONTROLLER d 0000800000 gt POSITION CONNECTOR T 106 BLEND BACK 0 AR Bac PISTON RIMARY SERVICE PORT CHECK VALVE F Y Be piston H B L I SUPPLY PORT L CHAMBER INLET EXHAUST WHEEL SPEED TEXIA Eom Fret FIGURE 5 SERVICE BRAKES HOLDING TRACTION CONTROL SOLENOID SECONDARY SERVICE PORT BRAKE VALVE SUPPLY PORT INLET EXHAUST VALVE EXHAUST wa PORT ca DELIVERY Qe es
15. eases the loading on the drive axle and further assists in eliminating wheel spin on acceleration OPERATION Reservoir air pressure is constantly present at the traction solenoid When the electronic controller detects wheel spin it energizes the solenoid and in response the solenoid opens momentarily While the solenoid is open air is delivered through internal passages to double check valve diaphragm A Note If the optional auxiliary port is in use traction solenoid air pressure is also delivered to the air suspension system of the tag or non drive axle This signal pressure is used to exhaust some of the air pressure from the suspension bags on the tag axle This causes some of the vehicle weight carried by the tag axle to shift to the drive axle further enhancing the traction control The check valve diaphragm flexes in response and seals the passage to the open exhaust of the secondary delivery of the brake valve Once past double check valve A air from the solenoid flows to double check valve which flexes and seals the passage to the open exhaust of the primary delivery of the brake valve Air flowing around double check valve B moves through the rest of the valve in the same manner as normal service brake application andis delivered out the delivery ports of he ATR 1DC valve to he antilock modulators near the rear wheels they serve When the electronic controller de energizes the ATR 1DC valve
16. from all vehicle reservoirs REMOVAL 1 Identify and mark or label all electrical wiring harnesses and air lines and their respective connections on the assembly to facilitate ease of installation Disconnect the air lines and wire harnesses Remove the controller and valve assembly AT 1DC from the vehicle Note The antilock controller may not be mounted to the ATR 1DC valve Refer to Figure 1 INSTALLATION 1 Install the assembled unit on the vehicle 2 Reconnect all air lines and wire hamesses to the unit using the identification made during REMOVAL step 1 3 After installing the unit perform the OPERATION amp LEAKAGE TESTS for the air valve before placing the vehicle in service DISASSEMBLY PREPARATION FOR DISASSEMBLY 1 Remove all air fittings and plugs from the valve 2 Markthe relationship of the valve cover 3 to the body 4 and if the valve is equipped with a mounting bracket 15 mark the relationship of the bracket to the cover and body 4 3 Mark the relationship of the electronic controller 1 to the cover 3 DISASSEMBLY The following disassembly and assembly procedure is presented for reference purposes only Instructions packaged with repair and maintenance kits should always be followed instead of the instructions presented here CAUTION The valve may be lightly clamped in a bench vise during disassembly however over clamping will result in damage to the valve and result in leakage
17. ounds the coils of the large end of the spring 36 when the valve seat 82 is installed in the cover 3 Make certain that the guide 35 is centered over the spring 36 which was installed in step 3 Note The check valve must be installed so that the top hat portion fits into the valve seat 32 6 Install the small and large diameter o rings 27 amp 28 on the check valve seat 23 7 Install the spring 26 on the inlet seat 29 so that the small diameter fits over and around the air passage through the center of the inlet seat 8 Install the check valve 24 and valve guide 25 in the check valve seat 23 Note The check valve must be installed so that the top hat portion fits into the valve seat 23 Install the valve guide 25 so that its flange contains surrounds the coils of the large end of the spring 26 when the valve seat 29 is installed in the cover 3 Use a small amount grease to hold these parts in the valve seat 23 9 Install the assembled valve seat 23 with the check valve and valve guide 24 amp 25 into the cover 3 bore and while holding it in place install the retaining ring 22 Make certain the retaining ring is fully seated in its groove 10 Install the valve retainer 10 on the inlet and exhaust valve 11 so that the flange of the retainer 10 surrounds the rubber portion of the valve Install the inlet and exhaust valve in the body 4 11 Install the inlet and exhaust valve
18. re operating normally Always check the vehicle brake system for proper operation after performing brake work and before returning the vehicle to service OPERATION TEST 1 Apply and release the brakes several times and check tor prompt application and release at each wheel Ifa prompt reaction is noted at some but not all wheels test the antilock modulator M 21 or M 22 between the ATR 1DC valve and the brake chamber for proper operation If a sluggish response is noted at all wheels inspect for a kinked or obstructed air line leading to or from the ATR 1DC valve If a complete release of the brakes is noted at some but not all wheels test the antilock modulator M 21 or M 22 between the ATR 1DC valve and the brake chamber for proper operation If an incomplete release is noted at all wheels inspect for a kinked or obstructed air line leading to or from the ATR 1DC valve Note The ATR 1DC valve differential pressure can be checked by applying 10 psito the service port and noting the pressure registered at the delivery port Subtract delivery port pressure from the 10 psi service pressure to obtain the differential Compare the measured differential with the pressure specified for the ATR 1DC valve part number see the I 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
19. s traction solenoid air between the solenoid and the double check valve A including the air signal sent to the suspension system through the optional auxiliary port returns to the solenoid and is exhausted Air between double check valve A and B is exhausted from the secondary circuit of the brake valve Air between the relay piston and double check valve B is exhausted from the primary circuit of the brake valve Air in the service brakes is exhausted at the main ATR 1 DC valve s exhaust port PREVENTIVE MAINTENANCE GENERAL Perform the tests and inspections presented at the prescribed intervals Ifthe ATR 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 contaminates and visually inspect the exterior for excessive corrosion and physical damage 2 Inspectallairlines connected to the ATR DC valve for signs of wear or physical damage Replace as necessary 3 Test air line fittings for excessive leakage and tighten or replace as necessary 4 Perform the Leakage Test described in this manual EVERY YEAR 100 000 MILES OR 3 600 OPERATING HOURS 1 Perform the Operation and Leakage Tests described in this manual WARNING PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY O
20. seat 23 with o rings 27 amp 28 Remove o rings 27 amp 28 from the check valve seat 10 12 Remove the check valve 24 guide 25 and spring 26 18 Remove the inlet seat 29 with o rings 30 amp 31 then remove o rings 30 amp 31 from the inlet sea 29 14 Remove the check valve seat 32 from the valve cover 8 Remove both o ring 33 18 Remove the check valve 34 guide 35 and spring 36 16 Remove the primary inlet seat 37 with o rings 38 39 amp 40 then remove o rings 38 39 amp 40 from the primary inlet seat 37 17 Donotdisassemble the ATR 1DC valve any further than described here CLEANING amp INSPECTION 1 Using mineral spirits or an equivalent solvent clean and thoroughly dry all metal parts Do not damage bores with metal tools 2 Wash all retained nonmetallic components in a soap and water solution making certain to rinse and dry thoroughly 3 Inspect the interior and exterior of all metal parts that will be reused for severe corrosion pitting and cracks Superficial corrosion and or pitting on the exterior portion of the body 4 and cover 3 is acceptable Replace the entire valve if the interior of the body or cover exhibit signs of corrosion or pitting 4 Inspect each nonmetallic component for cracks wear ordistortion Replace the entire valve if these conditions are found 5 Inspect the bores of both the body 4 and cover 3 for deep scuffing or go
21. the differential will be higher 2 Disconnect the ATR 1DC valve s two pin solenoid connector from the controller wire harness Apply the probes of a volt ohm meter to the connector leading to the solenoid and note the resistance of the solenoid is between 10 and 12 ohms If resistance other than this is noted replace the ATR 1DC valve 3 Apply and remove vehicle power 12 vdc to the two pin connector half leading to the ATR 1 DC valve solenoid while observing the brake chambers Note that a brake application is made and held while power is applied to the ATR 1DC valve s solenoid and that it is released when power is removed LEAKAGE TESTS 1 Build the air system pressure to governor cutout Apply a soap solution to the exhaust port The leakage noted should not exceed a 1 bubble in less than 3 seconds 2 Make and hold a full brake application and apply a soap solution to the exhaust port and around the cover where itjoins the body The leakage noted should not exceed a 1 bubble in less than 3 seconds at the exhaust port if the ATR 1DC valve fails to function as described or leakage is excessive it should be replaced with a new or genuine Bendix remanufactured unit or repaired using a genuine Bendix repair kit available at any authorized parts outlet VEHICLE PREPARATION 1 Park the vehicle on a level surface and block the wheels and or hold the vehicle by means other than the air brakes 2 Drain the air pressure
22. uges Replace the entire valve if either are found 6 Make certain the air channel running between the top surface of the body 1 and its supply port is clear and free of obstruction 7 Make certain all air channels and exhaust passages in the valve cover 3 are clear and free of obstruction 8 Inspect the pipe threads in the body 4 and valve cover 8 Make certain they are clean and free of thread sealant 9 Inspect he relay piston spring 20 for signs of corrosion pitting and cracks Replace as necessary 10 Inspect all air line fittings for corrosion and replace as necessary Make certain to remove all old thread sealant before reuse ASSEMBLY 1 Prior to assembly lubricate all o rings seals and pistons as well as body and cover bores using silicone lubricant 2 Install the large and small diameter o rings 38 39 8 40 the primary inlet seat 37 then insert the small diameter of the seat 37 into the bore in the cover 3 Do not cut or pinch the o rings 3 Install the spring 36 on the inlet seat 37 so that the small diameter fits over and around the air passage through the center of the inlet seat Install o ring 33 on the check valve seat 32 Using a small amount of grease applied to the check valve 34 and guide 35 to secure both items to the check valve seat 32 Gently insert the assembled items into the valve cover 3 Install the valve guide 35 so that its flange contains surr
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