Service Manual
Contents
1. INSTALLATION MANUAL Section 1 General Information Checking TOMMTALLEQKSN AA AALAALAAALAS 18 OEM and Retrofit c cccccccssessssssssssecsessessessessessessessesscsecsecssee 3 Section 6 Troubleshooting System Description ssessessssssssssessessessessessessessesseseeseoseoseoses 3 Questions and ANSWET ssessssesesessesesessssesesessesesesessesesese 20 Section 2 System Components Pressure Protection Valve s ssesseessesssessesssesseesseoseesseeses 5 CAO TTVOPIITATIAASSEIMDIY ssscscessencasesserecsencnsassessesencnsessereeses 5 Red On Off Ball Valve ssscscessssscesssssseceseseesesesseescosesescaseerees 5 Air Dryer and Filter cccccscassseersssencnsessesecsencnsasssasenencasessecesees 5 Air Pressure Regulator e sesessessessessessessessesseessessessesseeseeses 5 Pressure Differential SWitCh ss ssesssessesssesssesseeseeeseesserses 5 AENA G E A cscrssscxssestsiss senna pean ue ennen ead 5 Rotary Union Assem bly sseessesssessesssesseessesssessessseoseesseeses 5 FMS ssesssessrssresssossesorossseoressseovesssesrerovusareovassreossssrorsssosersss 5 MidieatOor Light ssseseessssesserssscsresseessssscssesecesressesaesrsrsersssssesser 5 Section 3 Preparation Installation MOONS sesesesessesesesesessesesesessesesesessesesesesessesesesssss 6 Identifying Trailer Axle Type ss sssesssesssessseesssesseesseessersses 6 Section 4 Installation Installation ProcedureS s essesssessees2. e Retrofitting the automatic tire inflation system on an existing fleet trailer Before You Begin This manual provides installation and maintenance procedures for the Automatic Tire Inflation System Use the procedures in the manual to install the tire inflation system on either new trailer axles at original equipment manufacturers OEM or in service trailer axles at fleets Read and understand all instruction and procedures before you begin to service components Read and observe all Caution and Warning safety alerts that precede instructions or procedures you will perform These alerts help to avoid damage to components serious personal injury or both Follow your company s maintenance and service installation and diagnostics guidelines Access Product and Service Information on Our Website visit www tireinflation com System Description The Automatic Tire Inflation System is a commercial tire monitoring maintenance and inflation system that is permanently mounted to the trailer to fill maintain and warn a truck operator of the loss of trailer tire pressure The system delivers air to a leaking tire during vehicle operation A low pressure warning indicator mounted on the trailer informs the driver that a tire is losing air and is being filled by the on board system A series of filters and check valves isolate the tires from each other so that each tire is monitored and serviced individually A pre
3. 877 550 6111 into the center hole of the stator which is before continuing the installation threaded into the axle plug Then thread and hand tighten the rotary union to hubcap INSTALLATION MANUAL Note Some resistance is normal when inserting the 1 4 inch tube into the Stator Plug seal 3 Align the outlets on the rotary union to align with the valve stems of the tires The fill plug may not end up in the 12 o clock position Figure 14 Note Loosening the Rotary Union to align with the valve stems is unacceptable and will create oil leaks Installing the System Control Unit Note It is recommended that the Control Unit Assembly be mounted on a trailer sub frame preferably facing the rear of the trailer This helps to protect it from flying debris 1 Mount the Control Unit Assembly and mount ing bracket in a location that is accessible and free of hazards Figure 15 FS Gs AT Weld or bolt the mounting bracket to the sub frame Tip The mounting bracket is multi configured and reversible so the control unit can be mounted in various locations Pressure Protection Valve PPV 1 Open the dump valve located on the bottom of the reserve tank to drain all of the air from the tank 2 Mount the Pressure Protection Valve PPV in a spare port on the Air System Service Tank preferably on the TOP half of the air tank The PPV has 3 8 inch nipple use of a reducer may be required Wrap threads
4. Lubricated Wheel Ends Remove Hubcap and set aside You must determine the Trailer Axle Type before you purchase the System If no hole is drilled 1 Locate the TOP CENTER of the axle which is the preferred location for the axle fitting Tip Some manufacturers place a top centered identifier hole in the axle tube This identifier hole may be used to locate the air fitting top center of axle INSTALLATION MANUAL 2 Drill a 11 32 344 inch diameter hole straight Installing the Axle Air Fitting into the TOP CENTER of the axle Remove the plug from the TOP CENTER hole 4 Hand tighten the 1 8 inch NPT 27 x 1 4 inch elbow tube air fitting into the tapped hole Once hand tight tighten the air fitting two additional turns using a open end wrench Tip Use of a drilling and tapping fluid is recommended as well as carbon tipped drill bits 5 Continue to tighten fitting until air tubing is facing the left Driver side side of the trailer 3 Tap the drilled hole straight with a 1 8 inch Cleaning the Inside of the Axle Tube NPT 27 tap spiral fluted or interrupted thread tap is highly recommended Do not run tap entirely through the hole Allow some thread taper in tapped hole 1 Cover the wheel end assemblies to protect the bearings and carefully remove the welsh plugs from both ends of the spindle INSTALLATION MANUAL _ _ 4 Some hubs have cotter pin holes Remove all ms burrs
5. Tire Inflation System for air leaks before putting the vehicle into service 1 Use soap and water in a spray bottle to check for leaks around all air fittings hose connections and the rotary union a Listen for audible leaks or any bubbles b If you detect a leak Tighten or replace fittings that leak 2 Identify the source and replace parts as required 3 If the relief valves on the rotary union poppets are bleeding air there is an internal wheel end leak If this occurs check Rotory Union and axle plug stator for leaks 4 Tighten secure or replace the leaking component Tip If a leak is found at the compression fitting the nut may not be fully torqued and may need to be tightened Lubricate the Wheel Ends Add lubricant using side fill or depressurize the System then remove Rotary Union and fill through hubcap face Wipe all excess oil from inside of ring before replacing rotary union When replacing rotary union ensure o ring is positioned correctly Oil Level Below Wheel Vents Install wheel end lubricant to the correct level in accordance with the trailer axle manufacturers recommendations This level should be below the Rotary Union when mounted on the hubcap INSTALLATION MANUAL Install the Decals 1 Install one system identifier decal on each side of the trailer ABOVE the tandem 2 Install the Indicator Light decal on the trailer BELOW the indicator light 3 Install System Inform
6. with Teflon tape Figure 16 3 Tighten the PPV fitting hand tight Then tighten the fitting three 3 additional turns 4 Position the PPV with the slotted screw in the valve facing DOWN AirLines 1 Route an airline from the PPV to the red handled ball valve INPUT left side port of the Control Unit Assembly INSTALLATION MANUAL Use grommets to protect the airlines from Ensure that you allow adequate slack in the air contacting sharp objects at thru hole line for suspension movement locations Use the slack in the existing air lines as a Use tie wraps to secure the automatic tire reference inflation system airlines to existing air lines Figure 19 This will allow for adequate slack in suspension movement Install the Warning Indicator Light Make the electrical connections in the trailer s 2 Route the 1 4 airline tubing from the seven way box The fleet must decide which OUTPUT right side port of the Control Unit pin will supply constant 12 volt power Assembly to the air line tee Blue pin Auxiliary is recommended Refer to Figure 20 Oe Figure 20 3 Route the airlines to the fittings installed on the axles Tip The anti lock braking system ABS contacts Note When routing air lines on a trailer with a slider as well as some auxiliary contacts offer a constant box DO NOT route tubing through sub frame of trailer power source INSTALLATION MANUAL For Vans amp Refeers No
7. 26 Pigtail oS fh Figure 26 ny Pressure switch Figure 24 System Operational Check Air Delivery 4 Make sure the indicator light comes ON and Note Lower all tire pressures to approximately 10lbs remains ON when air flows from the Rotary below regulated pressure setting Union valve this may take several seconds Secure the leak and let the system air back up 1 Install an air pressure source capable of deliv until the indicator light turns itself off ering 120 psi to the Red emergency gladhand on the trailer INSTALLATION MANUAL 5 Make sure the indicator light turns OFF when the air flow stops and system air has equalized the tire pressures Installing the System Flex Hoses Inside Tire 1 Connect the inside flex hose to each of the inside tire valve stems Ensure that the tires are not over inflated before connecting 2 Tighten the fittings hand tight until snug Note Do not over tighten or o ring damage may occur Outside Tire 1 Connect the outside flex hose with the 180 curve to each of the outside tire valve stems 2 Connect the knurled fittings on the inside and outside flex hoses to the Rotary Union fittings 3 Tighten the knurled fittings hand tight Note Do not tighten a hose fitting more than hand tight Checking the System for Leaks CAUTION Air leaks in the Tire Inflation System can damage components during operation Always test the entire
8. and sharp edges from all cotter pin holes in the spindle bore using a 1 2 inch diameter mounted grinding stone 5 Remove spindle end sponges filters used in Hendrickson axles Note An 8 5 8 to 1 2 inch diameter PVC pipe with a quick connect and an on off valve on one end and a tube cap with 45 exhaust ports 180 apart on the other end works very well for cleaning axle tubes CAUTION i Figure 9 Do NOT use any removal technique that could i possibly damage the surface of the spindle PROTECT THE SPINDLE BORE AT ALL TIMES Tip A slide hammer with a sheet metal threaded screw will effectively remove axle spindle welsh plugs 2 Simply puncture the axle spindle welsh plug with the tip of the screw and thread into the plug Once threaded and secured in the plug angle the screw to get a firm grip on the plug and use slide to remove plug This may take several tries an L shaped fitting will also work 6 Connect a high volume air line to the long cleaning tool pipe 3 Remove all sealant residue and machining marks from the spindle bore using an 80grit 7 Insert the cleaning tool through the spindle sand paper flap wheel on one side of the axle Figure 8 pe mii at na Figure 10 INSTALLATION MANUAL 8 Open the cleaning tool valve and blow out the axle tube while moving the tool through 3 Install stator into axle plug torque to 25 foot the length of the axle spindle pounds 9 Rotate the too
9. ation decal on suspension so it is visible from each wheel side Figure 29 NOTICE THIS VEHICLE 5 EQUIPPED WITH AN AUTOMATIC TIRE INFLATION SYSTEM HOSES ARE UNDER PRESSURE USE CAUTION WHEN SERVICING TO TURN SYSTEM OFF SEE RED SWITCH ON CONTROL UNIT MOUNTED UNDER TRAILER kisi p Bie ods a Bi ii gy m Pmp o peee ee INSTALLATION MANUAL 7 Allow the system to fill the tire to the set pressure Section 5 Use and Service Setting the System Pressure Note System pressure can be checked at RU fitting WARNING with a tire gauge To prevent serious injury ALWAYS wear eye protection and follow OSHA and company recommended safety procedures when performing vehicle maintenance or service Incorrect Cold Tire Pressure CAUTION If you change the pressure from the factory setting on the regulator be sure to reset the pressure differential switch to the new air pressure setting Note If changing tire pressure the system pressure is preset at the factory according to the customer s specifications 1 Use a reliable tire pressure gauge to check the test tire pressure Tire pressure should read fleet s pressure setting or cold tire pressure 1 Make sure the shut off valve on the Control Unit Assembly is in the ON position Figure 30 2 To increase the tire pressure locate the reg ulator and turn the pressure adjustment screw clockwise approximately 1 8 turn use a 2 mm or 5 64 inch Allen
10. controls the tire inflation system In the OFF position with the valve in perpendicular position airflow is disabled In the ON position in line with the valve air line airflow is enabled Air Dryer and Filter The regulator filter prevents moisture and contaminants from entering the Control Unit Assembly However we recommend using an auxiliary truck mounted air dryer in conjunction with the 10 micron filter with a semi automatic drain valve This filter should be serviced during scheduled maintenance Air Pressure Regulator The Pressure Regulator is preset at the factory to the customer s preferred cold tire pressure setting Pressure Differential Switch A flow sensing Pressure Switch in the Control Unit Assembly makes electrical contact through the wiring harness and activates the warning indicator light when pressure drops in the regulator Axle Plug An Axle Plug is installed in the spindle bore A Stator is threaded into the center of the axle plug The stator has a filter that filters the axle air as it passes through the axle tube just before the air enters the tire Rotary Union Assembly The Rotary Union assembly is threaded directly into the hubcap and provides an air distribution point between the stationary axle and the rotating hub The rotary union then passes air through flexible hoses to both tires to maintain the pre set tire inflation pressure Flex Hoses The flexible wheel end hoses distrib
11. e of axle used Guidance for basic axle types is provided below Hollow Spindle Axles Most axle spindles installed by OEMs are hollow Determine the axle s spindle bore diameter Measure the inner diameter of the borehole at the spindle end This measurement should be one of the following 1 75 ID or 2 75 ID Determine the axle type from the placard located on the axle Once you have identified this measurement follow the installation procedures in this manual Solid Spindle Axles In retrofit installations on older vehicles you may encounter a solid spindle axle The procedure for this application is not included in this manual For information contact Technical Service at 877 550 6111 Axles Prepared by the Manufacturer A trailer axle manufacturer may prepare an axle for a tire inflation system installation A prepared axle has one or more of the following features The TOP CENTER of the axle beam is tapped to accept the tire inflation system s air fitting A plug is installed in the hole Refer to Figure 1 Note Some axle manufacturers may select an alternate location for the tapped hole The picture below shows Hendrickson location only all others are top dead center INSTALLATION MANUAL DO NOT DRILL 4 2 inch minimum APPROVED DRILLING AREA Section 4 Installation Some quick tips for an easier installation 1 Lay all the pieces of the kit out and become familiar with each piece and wha
12. ects to the blue pin auxiliary in the sev en way box The White wire from the Warning WARNING Indicator connects to the white pin ground of To prevent serious personal injury and the seven way box The Black wire from the damage to components ALWAYS disconnect Control Unit Assembly connects to the black wire the battery ground cable before working from the Warning Indicator on an electrical system Sparks from a connected battery can cause Note Refer to the wiring diagram to make the correct electrical shock and or ignite flammable electrical connections in the sevenway box Refer to substances figure 20 INSTALLATION MANUAL 2 Make sure the shut off valve on the Control Unit Assembly is in the ON position and then apply supply air to the trailer Figure 25 Note In some applications it may be more efficient to use an electrical source in an alternative location on the trailer Optional pigtail connection allows those mounting 3 Once the system is pressured up and it no lon the light on the back drivers side of the trailer ger is filling tires Depress both valve cores of to hook up to the pressure switch and still get each Rotary Union outlet to make sure air is current from the seven way via the existing harness flowing to the rotary union This is a good time Refer to Figure 24 and place to check and see how much pressure is being put into the tire A standard truck tire air gauge can be used Refer to Figure
13. increasing sensitivity turn clockwise until Warning Indicator turns on then turn back 1 8 turn and the Warning Indicator light will go off Once the light is barely off then depress the valve cores at the rotary union fitting until the Warning Indicator illuminates or loosen hose until it leaks Several hoses may have to be releasing air at the same time to get the light to come on 5 When the light comes on tighten the hose fitting and let the system charge making sure the Warning Indicator turns off when it is fully charged This should only take a minute or less Tip Further adjustments to the pressure differential switch may be required to attain desired sensitivity 6 Replace the rubber plug or setscrew to the pressure differential switch Checking Operation of the Indicator Light The following procedure should be used to check the Warning Indicator light at regular intervals to ensure proper operation 1 Disconnect one or more knurled hose fittings from a Rotary Union 2 Press the valve core in the Rotary Union fitting and allow the air to bleed from the tire inflation system 3 The Warning Indicator light should illuminate after several seconds This indicates the Warning Indicator light is operating correctly 4 The Warning Indicator light should turn off once the system pressure equalizes May take about a minute WARNING The Tire Inflation System uses compressed air To prevent serious personal inj
14. l 1 4 turn and repeat step 7 10 Position a flashlight at one end of the spindle and look through the other end to check the inside of the axle tube Make sure all loose debris has been removed from the axle tube 11 Repeat steps 7 through 9 until the axle tube is clean and the axle is clear of debris Installing the Axle Plug Assembly 1 Remove all foreign material and debris from the inner bore of each spindle using a clean soft cloth or shop rag Installing the Rotary Union Assembly Note Clean spindle bores from any contamination CAUTION Some axle manufacturers specify the use of oil 2 Line up and place axle plug inside the spindle in a hubcap Always follow the manufacturer s bore with the O ring entering the spindle first recommended fill level when filling the hub until the Tolerance ring makes contact with with oil spindle then tap the plug in using a driver tool until flush with outside edge of spindle 1 Install the hubcap with the fill plug at or around the 12 o clock position Figure 11 oe Figure 13 Axle Plug Flush waite Spindle RES ee PRR RP ee 175 Axle Plus ee em e e e Spindle T AM a AE IEW aI M aE ai oe a ar F ne SES Le A e EEEE EEES Axle Pleg The End of the Axle Plug Assembly should be flush with the spindle face If the axle Plug Assembly sticks outside of the spindle face 2 Insert the 1 4 inch tube of the rotary union contact Technical Service at
15. r The warning indicator is inoperative The pressure differential switch is set incorrectly Electrical wiring is incorrect Make sure 120 psi is being supplied to the trailer and shut off valve is in the on position on the control unit Repair or replace defective tire Inspect system for leaking fittings or components and replace Adjust pressure differential switch refer to sec 5 in this manual Refer to wire harness installation sec 4 in this manual Ensure that there is 12 volt power being supplied to the trailer Check indicator connections and or replace indicator Adjust pressure differential switch refer to sec 5 in this manual Refer to wire harness installation sec 4 in this manual
16. sesssessesssessessseeseesseeses 7 Installing the Axle Air Fitting ssessessesssesssessesssesseesseeses 8 Cleaning the Axle Tube Interior ss sssessssssesssesseessesssessesss 9 Installing the Axle Plug Assembly ss sseessesssessesssessees 10 Installing the Rotary Union Assembly cceee 10 Installing the System Control Unit esesecseees 11 Pressure Protection Valve PPV cssssssecssssesseseeee 11 PIM MNS Senza cececeecey n E 11 Installing the Warning Indicator Light 00 12 System Operation Che cK ssesssessessseessesseessesssessesssesseess 14 Installing the System Flex HOSES cseeseseeseseseeen 15 Checking the System for LeakS essececsseseeeseeees 15 Lubricating the Wheel EndS esssecsssesesesescesseeees 15 Installing the Decals se seessessesseeseessessesseeseessesseoseeseesees 16 Section 5 Use and Service Setting the System Pressure sscsssesscssssesssecsceseees 17 Incorrect Cold Tire Pressure ssessesseessesssessesssessessseesees 17 Setting the Pressure Differential Switch 0 17 Checking operation of the Indicator Light 18 Turning Off the Tire Inflation System cesses 18 INSTALLATION MANUAL Section 1 General Information About This Manual The procedures detailed in this manual describe e Installing the automatic tire inflation system on anew trailer at the Original Equipment Manufacturer OEM
17. ssure protection valve PPV is located downstream of the trailer reserve tank and upstream of the control valve The PPV provides separate and independent isolation from the trailer air brake system if the reserve tank pressure falls below the safe level The PPV assures the integrity of the braking performance of the vehicle at all times by closing the PPV A pressure regulator in the system controls the pre set tire pressure as recommended by the customer s tire manufacturer INSTALLATION MANUAL Wheel End Assembly To valve stem Control Unit Air supply Air to axle To valve stem or i wr i Indicator Light mer i l Glad hand One chon Ergire dirven Compressor INSTALLATION MANUAL Section 2 System Components Pressure Protection Valve PPV The Pressure Protection Valve PPV is mounted downstream of the trailer s reserve air tank to allow separation from other trailer functions This valve will open if the system is pressurized and functioning properly This valve also controls the air Supply to the regulator Control Unit Assembly The Control Unit Assembly controls the operation pre set tire pressure setting and warning sensitivity of the tire inflation system The Control Unit Assembly contains a Shut off Valve Filter Air Pressure Regulator and Pressure Switch Red On Off Ball Valve The Shut off Ball Valve controls the air supply from the Trailers air tank to the regulator that
18. t it does 2 Lower the air pressure in each of the tires until they are about 10 psi under the control setting 3 Drain the oil and remove the hubcap assembly from each of the wheel ends that will be receiving the inflation kit 4 At this time make sure the end plug of the axle spindle and the end plug in the kit is the same size 5 Pull the end plugs from the axle spindles making sure that you do not damage the bore Make sure the bore is free of burrs and is properly smoothed to accept the end plug assembly Make sure that the shoulder in the bore is intact You may need to use a sanding disk and or small grinder to accomplish this 6 Clean the bore of the axle housing with compressed air and then pull a solvent soaked rag through the bore and then pull a dry rag through the bore 7 Lubricate the O ring on the axle plug to ease installation 8 Insert the axle plug O ring first into the spindle bore and tap into place until it is flush with the face of the axle spindle 9 Determine the best place to mount the control unit preferred location is in the rear roadside of the trailer on the backside of the cross member The driver or service personnel must be able to get to the panel to shut off the supply valve to isolate and determine which tire is going flat Installation Procedures For Oil Lubricated Wheel Ends 1 Place a container under the hubcap 2 Remove the Hubcap 3 Drain oil from hub For Grease
19. te Use cable clamps and self tapping screws furnished in the Kit to secure the cable to the front of Note Mount the indicator light in the vertical the trailer Refer to Figure 22 position somewhere on the trailer where it can be seen by the driver in his rear view mirror For example on the front of the trailer in line of sight of the drivers mirror 30 inches 76 2 cm from the BOTTOM of the coupler Figure 22 and as close to the corner of the trailer as possible Refer to Figure 21 Indicator Light Choke seals are installed by drilling a 7 16 437 diameter hole and tapping a 1 4 NPT 2 Route the electrical cable from the indicator light to the trailer s seven way electrical box Refer to the wiring diagram to make the correct electrical connections in the sevenway box CAUTION Rubber choke seals furnished in the kit may be 3 Route the electrical cable from the control used at hole locations to protect the electrical unit to the seven way electrical box cable from damage caused by sharp objects and moisture Tip Provide slack in all cable runs between the subframe and the main trailer frame if the trailer is For All other Trailers equipped with a sliding bogey Use the slack in existing air lines as a reference Refer to Figure 17 1 Mount the indicator light so that it is visible to the driver and in a location that can not 4 The White wire from the Control Unit Assembly be easily damaged conn
20. ury and damage to components ALWAYS turn off the Tire Inflation System and drain the system at the wheel end before performing vehicle maintenance or service WARNING To prevent serious personal injury make sure ALL pressure is bled off before performing any wheel end maintenance Turning off the Tire Inflation System Pressure should be removed by the following steps 1 Turn the Red Ball shut off valve on the Control Unit Assembly to the OFF position 2 Any Rotary Union fitting check valve may be depressed to bleed down the pressure within the tire inflation system Checking for Air Leaks Depending on system pressure and the vehicle s air requirements the Warning Indicator light will illuminate and remain ON for up to 10 minutes during initial charging of the system If the Warning Indicator light remains ON for more than 10 minutes INSTALLATION MANUAL 1 Inspect the tires and valve stem components for leaks 2 Repair as necessary INSTALLATION MANUAL Section 6 Troubleshooting Condition Possible Cause Solution Warning Indicator remains illuminated Warning indicator does not illuminate when air is ex hausted from the system System has not fully charged from initial hook up Defective tire causing loss of air System leak causing air loss Pressure differential switch set incorrectly Electrical wiring is incorrect 12 volt power supply is not connected to the traile
21. ute air from the rotary union to each tire via the valve stem Each hose contains an internal check valve and senses the individual tires air pressure in each tire This ensures that each tire is checked independently of the others Indicator Light The warning indicator includes a light mounted on the driver side of the trailer and is visible by the driver in the cab mirror The warning indicator is illuminated when the system senses a pressure drop as air flows to the low tire on the trailer INSTALLATION MANUAL Section 3 Preparation Installation Tools No specialty tools are needed to install the automatic tire inflation system However there are some tools to have handy that will allow for a faster and more efficient install General Tool List 1 Power drill 2 2 each 11 32 inch carbon tipped drill bits 3 7 16 inch drill bit 4 1 8 inch NPT 27 tap 5 Teflon tape 6 80 grit sandpaper flap wheel 7 8 ft PVC pipe 8 Torque wrench 9 2mm or 5 64 inch Allen wrench 10 Screw driver Phillips 11 Oil catch pan 12 1 4 inch tap 13 Spray bottle of soapy water 14 Slide hammer Special Tools 1 Hubspear 2 End Plug Remover Dent Puller Slide Hammer 3 End Plug Driver order part B 72 Identifying Trailer Axle Type The various trailer axle manufacturers use different axle designs and spindle configurations To fit the automatic tire inflation system to your axle type match the axle plug size to the typ
22. wrench Repeat steps 6 through 8 on test tire 3 To decrease the tire pressure Turn the system pressure adjustment screw on the regulator COUNTER CLOCKWISE approximately 1 8 turns 4 Once the test tire is inflated to the correct air pressure reconnect the flex hoses to all remaining tires 2 Make sure the supply air pressure from Truck is at least 120 psi 3 Disconnect all wheel end flex hoses at the Rotary Union fittings Setting the Pressure Differential Switch WARNING To prevent serious injury ALWAYS wear eye protection and follow OSHA and company 4 Select one tire to use as a test tire 5 Lower the pressure in the test tire to approximately 10 psi below the fleet s setting For example if the fleet runs 100 psi reduce the pressure in the tire to 90 psi 6 Reconnect the test tire wheel end flex hose recommended safety procedures when performing vehicle maintenance or service 1 Make sure the 120 psi air supply and 12 volt power source are connected to the trailer Ensure that you have the system fully pressurized INSTALLATION MANUAL 2 Remove all knurled fittings on flex hoses from the Rotary Union fittings at the wheel ends 3 Remove the rubber plug located on pressure switch between the two terminal connectors This rubber plug protects the inner adjustment screw and prevents tampering 4 Adjust the 7 32nd setscrew on the pressure switch with the system fully charged If
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