Hendrickson PRIMAAX, Technical Procedures

Page 1: ...Absorber 21 Air Fitting Inspection 22 Section 7 Alignment Adjustments 23 Ride Height Adjustment 23 Lateral Alignment 23 Axle Pinion Angle 24 Drive Axle Alignment Inspection Procedure Scrub Angle 24 Alignment Adjustment Instructions 26 Pinion Angle Adjustment 28 Section 8 Component Replacement 29 Fasteners 29 Height Control Valve 29 Air Spring 29 Shock Absorber 31 Transverse Torque Rod 32 Longitudi...

Page 2: ...rebuild instructions for the PRIMAAX EX PRIMAAX Suspensions for Volvo vehicles Hendrickson reserves the right to make changes and improvements to its products and publications at any time Contact Hendrickson Tech Services for information on the latest ver sion of this manual at 1 866 755 5968 toll free U S and Canada 630 910 2800 outside U S and Canada or e mail techservices hendrickson intl com T...

Page 3: ... pin axle connection decreases torsional axle stress for reduced main tenance and increased joint integrity Integrated axle stop contact pads reduce axle stress PRIMAAX EX SPECIFICATIONS FOR VOLVO VEHICLES Capacity 46 000 lbs 69 000 lbs Axle Configuration Tandem Tridem Site Travel Rating1 60 000 lbs 90 000 lbs Axle Travel2 7 0 7 5 7 0 7 5 Ground Clearance 9 25 9 25 Lift Axles Approved Approved Rid...

Page 4: ...ignal words must be observed to help minimize the risk of personal injury to service personnel or possibility of improper service meth ods which may damage the vehicle or render it unsafe This is the safety alert symbol It is used to alert you to potential personal injury haz ards Obey all safety messages that follow this symbol to avoid possible injury or death The following definitions indicate ...

Page 5: ...E TO DO SO CAN CAUSE LOSS OF VEHICLE CONTROL RESULTING IN PERSONAL INJURY OR PROPERTY DAMAGE LOAD CAPACITY ADHERETOTHE PUBLISHED CAPACITY RATINGS FORTHE SUSPENSION ADD ON AXLE ATTACHMENTS AND OTHER LOAD TRANSFERRING DEVICES CAN INCREASE THE SUSPENSION LOAD ABOVE ITS RATED AND APPROVED CAPACITIES WHICH CAN RESULT IN COMPONENT DAMAGE AND LOSS OF VEHICLE CONTROL POSSIBLY CAUSING PERSONAL INJURY OR PR...

Page 6: ...Y FIGURE 3 2 REPLACE ANY SAFETY DECALS THAT ARE FADED TORN MISSING ILLEGIBLE OR OTHERWISE DAMAGED CONTACT HENDRICKSON TO ORDER REPLACEMENT LABELS DO NOT USE THE SUSPENSION CROSS TUBE AS A JACKING POINT SEE FIGURE 3 3 REFERTO VEHICLE MANUFACTURER FOR PROPER JACKING INSTRUCTIONS SEE FIGURE 3 4 FIGURE 3 3 FIGURE 3 4 SHOCK ABSORBERS THE SHOCK ABSORBERS ARE THE REBOUND TRAVEL STOPS FOR THE SUSPENSION A...

Page 7: ... BRACKET AND VOID WARRANTY AIR SPRING LOWER MOUNTING STUDS IF THE AIR SPRING IS BEING REMOVED IT IS MANDATORY TO LUBRICATE THE LOWER AIR SPRING FASTENERS WITH PENETRATING OIL AND REMOVE WITH HAND TOOLS TO PREVENT DAMAGE TO THE LOWER AIR SPRING MOUNTING STUD FAILURE TO DO SO CAN CAUSE COMPONENT DAMAGE AND VOID WARRANTY AIR SPRING PRESSURE RETENTION SOME VEHICLE APPLICATIONS SUCH AS VEHICLES EQUIPPE...

Page 8: ... CAN BE FLAMMABLE POISONOUS AND CAUSE BURNS TO HELP AVOID SERIOUS PERSONAL INJURY CAREFULLY FOLLOW THE MANUFACTURER S PRODUCT INSTRUCTIONS AND GUIDELINES AND THE FOLLOWING PROCEDURES 1 WEAR PROPER EYE PROTECTION 2 WEAR CLOTHING THAT PROTECTS YOUR SKIN 3 WORK IN A WELL VENTILATED AREA 4 DO NOT USE GASOLINE OR SOLVENTS THAT CONTAIN GASOLINE GASOLINE CAN EXPLODE 5 HOT SOLUTION TANKS OR ALKALINE SOLUT...

Page 9: ...cial Tools SECTION 4 Special Tools These shop made tools are designed to install and remove pivot bushing and D Pin bushing Bushing tools are made from cold rolled steel or equivalent Drawings are for reference only Hendrickson does not supply these tools ...

Page 10: ...op made tool can be made from the drawing shown Hendrickson does not supply QUIK ALIGN tooling Material Optional per customer discretion Grade 80 or better case harden per SAE requirements TORQUE ROD BUSHING This shop made tool is designed for the torque rod bushing Bushing tools are made from cold rolled steel or equivalent Drawing is for reference only Hendrickson does not supply this tool TORQU...

Page 11: ...pped Reduces maintenance time by eliminating the need to remove the tires to gain access to the detachable end cap bolt NOTE Due to some vehicle configurations and or tire sizes wheel removal may be required Use the OTC Quick Wrench tool with Hendrickson PRIMAAX EX PRIMAAX suspension lon gitudinal torque rod to top pad configuration illustrated in Figure 4 2 and with PRIMAAX suspensions detachable...

Page 12: ...Parts Lists 12 17730 254 SECTION 5 Parts Lists PRIMAAX EX ...

Page 13: ...29 M16 x 2 6H Locknut 8 30 Shim may or may not required As req 31 Transverse Rod Assembly 2 60961 106 Shock Absorber Service Kit One Wheel End Includes Key Nos 32 34 39 32 60657 007 Shock Absorber 4 33 67463 006 Shock Upper Frame Bracket 4 34 50764 010 10 UNC 4 25 Upper Shock Bolt 4 35 22962 001 Flat Washer 4 36 49842 000 10 UNC Locknut 4 37 32043 017 5 8 11 UNC 6 0 Lower Shock Bolt 4 38 22962 004...

Page 14: ...Parts Lists 14 17730 254 PRIMAAX for Volvo Vehicles PRIMAAX ...

Page 15: ...04 003 7 8 9 UNC 3 5 Hex Bolt 4 26 22962 034 7 8 Dacromet Flat Washer 4 27 67274 XXX Longitudinal Torque Rod Assembly See pinion 4 angle chart on page 3 Replaces 64981 XXX 58821 012 Longitudinal Torque Rod Rear Bolt Service Kit One Wheel End Includes Key Nos 28 30 28 30418 009 7 8 14 UNF 2A 5 50 Hex Bolt 4 29 22962 034 7 8 Dacromet Flat Washer 8 30 29248 000 7 8 14 UNF 2B Locknut 4 31 M16 x 2 6G B...

Page 16: ...ents Signifies performance critical components HENDRICKSON RECOMMENDED PREVENTIVE MAINTENANCE INTERVALS PRE DELIVERY INSPECTION 1 Visually inspect the suspension for proper assembly 2 Verify the lateral alignment of the drive axles are within the vehicle manufacturer s toler ances contact the vehicle manufacturer for the correct lateral alignment instructions 3 Visually inspect the overall conditi...

Page 17: ...and integrated end cap Check for Proper suspension function Any signs of unusual movement loose or missing components Any signs of abrasive or adverse contact with other components Any damaged bent or cracked parts 2 Check all fasteners for proper torque with special attention to the following suspension connections QUIK ALIGN fasteners see Figure 6 2 Torque rod to top pad fasteners see Figure 6 2...

Page 18: ... manufacturer s tolerances contact the vehicle manufacturer for the correct lateral alignment instructions COMPONENT INSPECTION IMPORTANT NOTE Replace all worn or damaged parts Air spring Visually inspect the outer surface of the air spring for chafing uneven wear cracks or any signs of component damage Ensure that the upper bead plate is tight against the underside of the frame Check for any late...

Page 19: ...to help assess movement in this joint see Longitudinal and Transverse Torque Rods in this section for proper inspection Verify the Top Pad Longitudinal Torque Rod connections have the proper torque values maintained See Torque Specifications Section of this publication for recommended torque requirements Torque rods longitudinal and transverse All torque rods must be inspected for loose ness torn ...

Page 20: ... manufacturer For assis tance with inspection maintenance and rebuild instructions on these components see vehicle manufacturer PRIMAAX EX PRIMAAX SUSPENSIONS INCORPORATETRANSVERSE RODS FOR VEHICLE STABILITY IF THESE COMPONENTS ARE DISCONNECTED OR ARE NON FUNCTIONAL THE VEHICLE SHOULD NOT BE OPERATED FAILURE TO DO SO CAN RESULT IN ADVERSE VEHICLE HANDLING LOSS OF VEHICLE CONTROL POSSIBLE TIRE CONT...

Page 21: ...AX suspensions If shock absorber replacement is necessary Hendrickson recommends that the shock absorbers be replaced with identical Hendrickson Genuine parts for servicing Failure to do so will affect the suspension performance durability and will void the warranty Inspection of the shock absorber can be performed by doing a heat test and a visual inspection For instructions on shock absorber rep...

Page 22: ... cover of the shock Look for these potential problems when doing a visual inspection Inspect the shock absorbers fully extended Replaced as necessary NOTE The PRIMAAX EX PRIMAAX suspension is equipped with a premium seal on the shock however this seal will allow for misting to appear on the shock body misting is not a leak and is considered acceptable If the shock is damaged install new shock abso...

Page 23: ...ride height Correct as necessary Refer to Ride Height Adjustment in this section 6 Verify all suspension components are in good condition Repair or replace any worn or damaged suspension components before proceeding with the alignment process 7 Ensure all drive axle tires are the same size and properly inflated 8 Measure from the outside of the frame rail to the rim flange of the inner tire Record...

Page 24: ...e vehicle is positioned End with all wheels positioned straight ahead 3 DO NOT set the parking brake Chock the front wheels of the vehicle 4 Verify and maintain the air system at full operating pressure 5 Verify the vehicle is at the correct ride height Correct as necessary Refer to Ride Height Adjustment in this section 6 Verify all suspension components are in good condition Repair or replace an...

Page 25: ... axle MUST be corrected BEFORE checking the drive axle pinion angles Correct the alignment of this axle by following the proper alignment instructions for the PRIMAAX EX PRIMAAX suspension model as determined by the ride height of the suspension 14 Repeat Steps 12 and 13 for any remaining drive axle s Be sure all remaining drive axles are aligned relative to the front drive axle 15 After all drive...

Page 26: ...R PROPERTY DAMAGE 1 Support the frame at ride height PRIOR TO AND DURING DEFLATION AND INFLATION OF THE AIR SUSPENSION SYSTEM ENSURE THAT ALL PERSONNEL AND EQUIPMENT ARE CLEAR FROM UNDERTHE VEHICLE AND AROUNDTHE SERVICE AREA FAILURE TO DO SO CAN CAUSE SERIOUS PERSONAL INJURY DEATH OR PROPERTY DAMAGE 2 See additional Air Spring Warnings and Instructions in the Important Safety Notice Section of thi...

Page 27: ...ve the QUIK ALIGN collar being adjusted must be loose at the frame hanger This will allow the longitudinal torque rod to move freely with the axle while the alignment is adjusted Failure to do so will result in bushing preload in all rubber connections on that side of the axle shortening component life 9 On the side of the axle being adjusted loosen the fasteners connecting the longitudinal torque...

Page 28: ...nstall shims To decrease the pinion an gle remove shims SERVICE HINT A general rule of thumb is 1 8 change in the shim pack thickness will increase or decrease the pinion angle by degree 3 Tighten the longitudinal torque rod fasteners to the proper specification see Torque Speci fication Section of this publication per model designation 4 Re check the pinion angle and verify it is within the vehic...

Page 29: ...TO DO SO CAN CAUSE SERIOUS PERSONAL INJURY DEATH OR PROPERTY DAMAGE 4 See additional Air Spring Cautions and Warnings in the Important Safety Notice Section of this publication prior to deflating or inflating the air system 5 Lower the height control valve arm s to exhaust the air in the air springs and deflate the rear suspension SOME VEHICLE APPLICATIONS SUCH AS VEHICLES EQUIPPED WITH OUTRIGGERS...

Page 30: ... the air spring see Figure 8 1 FIGURE 8 1 4 Install the lower air spring mounting bracket around the cross tube engaging the mounting studs on the air spring IF THE AIR SPRING IS BEING REMOVED IT IS MANDATORY TO LUBRICATE THE LOWER AIR SPRING FASTENERS WITH PENETRATING OIL AND REMOVE WITH HAND TOOLS TO PREVENT DAMAGE TO THE LOWER AIR SPRING MOUNTING STUD FAILURE TO DO SO CAN CAUSE COMPONENT DAMAGE...

Page 31: ...or damage or wear replace as necessary see Preventive Maintenance Section of this publication ASSEMBLY 1 Install the shock absorber into the upper mounting bracket 2 Install the upper shock absorber mounting fasteners DO NOT tighten at this time THE UPPER SHOCK BOLT MUST BE INDEXED INTO THE RECESSED HEX BORE OF THE UPPER SHOCK MOUNTING BRACKET FOR PROPER FASTENER INSTALLATION FAILURE TO DO SO CAN ...

Page 32: ...es superior bushing retention in the torque rod end hub These torque rods can be identified by the part number 67428 XXX or the suffix N after any part number i e 62000 615N DISASSEMBLY 1 Chock the wheels of the vehicle SERVICE HINT Note the quantity of shims removed to maintain the pinion angle of the axle at assembly See Alignment Adjustments Section of this publication 2 Remove the torque rod m...

Page 33: ... IN THE LOSS OF VEHICLE CONTROL POSSIBLE PERSONAL INJURY OR PROPERTY DAMAGE AND VOID WARRANTY 1 Remove the torque rod as detailed in this section SERVICE HINT When servicing a straddle mount bar pin type bushing assembly mark the clocking position of the straddle mount bar pin flats on the torque rod end hub before disassembly This clocking mark will serve as a guide when installing the new bushin...

Page 34: ...position by approximately 3 16 see Figure 8 6 5 Press the straddle mount bar pin again from opposite side to center the bar pin within the torque rod end hub see Figure 8 7 FIGURE 8 5 FIGURE 8 6 FIGURE 8 7 6 Wipe off excess lubricant Allow the lubricant four hours to dissipate before operating vehicle IF THE TORQUE ROD ASSEMBLY IS NOT ALLOWED THE ALLOTTED TIME FOR THE LUBRICANT TO DISSIPATE THE BU...

Page 35: ...NJURY DEATH OR PROPERTY DAMAGE 5 See additional Air Spring Cautions and Warnings in the Important Safety Notice Section of this publication prior to deflating or inflating the air system SOME VEHICLE APPLICATIONS SUCH AS VEHICLES EQUIPPED WITH OUTRIGGERS RETAIN SOME PRESSURE IN THE AIR SPRINGS AT ALL TIMES PRIOR TO PERFORMING ANY MAINTENANCE SERVICE OR REPAIR OF THE SUSPENSION VERIFY EACH AIR SPRI...

Page 36: ...e QUIK ALIGN square drive in relationship to the frame hanger prior to loosening the QUIK ALIGN connection This will facilitate the axle alignment process after the repair is complete 12 Loosen both the QUIK ALIGN fasteners DO NOT remove at this time 13 Remove D pin fasteners on both sides of the suspension and discard SERVICE HINT It may be necessary to rotate the QUIK ALIGN eccentric collars to ...

Page 37: ... IN PERSONAL INJURY OR PROPERTY DAMAGE NOTE Use new QUIK ALIGN pivot bolt kit see Parts List Section of this publication for any axle alignment or disassembly of the QUIK ALIGN connection This ensures that the proper clamp load is applied to the connection to ensure the joint will not slip in service 4 Verify the correct QUIK ALIGN collar eccentric concentric is in the correct location as noted in...

Page 38: ...rt 15 See additional Air Spring Cautions and Warnings in the Important Safety Notice Section of this publication prior to deflating or inflating the air system 16 Connect the leveling valve link rod to the height control valve arm s to inflate the suspen sion See vehicle manufacturer s instructions 17 Remove frame support s 18 Remove the wheel chocks NOTE Alignment and QUIK ALIGN final torque is n...

Page 39: ...CE MUST BE APPLIED FLUSH TO THE THICKEST PART OF THE SUPPORT BEAM FAILURE TO STRIKETHE SUPPORT BEAM SQUARELY MAY RESULT IN COMPONENT DAMAGE PREMATURE FAILURE AND VOID WARRANTY SEE FIGURE 8 13 5 Place a piece of plywood or cardboard around the cross tube prior to applying blunt force to the support beam 6 Dislodge the support beam from the cross tube by hitting the support beam directly in front of...

Page 40: ...3 Line up the D Pin bushing with the clocking line that was put on the support beam prior to the removal of the D Pin bushing see Figure 8 17 4 Install the D Pin bushing installation tool and press in the new D Pin bushing until the outer metal sleeve is centered in the support beam assembly see Figures 8 18 and 8 19 FIGURE 8 16 FIGURE 8 17 FIGURE 8 18 FIGURE 8 19 NOTE If the service also requires...

Page 41: ...centric concentric is in the correct location as noted in the disassembly procedure 7 Install QUIK ALIGN connection with new Hendrickson fasteners and snug to about 50 100 foot pounds torque DO NOT tighten at this time The final torque must be done after the alignment is complete 8 Spread the support beams to facilitate the installation of the cross tube 9 Install the cross tube into the support b...

Page 42: ...ITANT SENSITIZER SIKAFLEX 221 CAUSES EYE IRRITATION MAY CAUSE SKIN RESPIRATORY IRRITATION MAY CAUSE SKIN AND OR RESPIRATORY SENSITIZATION AFTER PROLONGED CONTACT MAY BE HARMFUL IF SWALLOWED AVOID DIRECT CONTACT WEAR PERSONAL PROTECTIVE EQUIPMENT CHEMICAL RESISTANT GOGGLES GLOVES CLOTHING TO PREVENT DIRECT CONTACT WITH SKIN AND EYES USE ONLY IN WELLVENTILATED AREAS OPEN DOORS AND WINDOWS DURING USE...

Page 43: ...ROPERTY DAMAGE 25 See additional Air Spring Cautions and Warnings in the Important Safety Notice Section of this publication prior to deflating or inflating the air system 26 Connect the height control valve linkage assembly to the height control valve arm s to inflate the suspension 27 Remove the frame support 28 Remove the wheel chocks 29 Verify the ride height is correct refer to Alignment Adju...

Page 44: ...upport beam eye When pressing in the new bushings over shoot desired final position by 3 16 and press again from the opposite side to center the bushing within the support beam eye bore if necessary see Figure 8 28 5 Install the U beam assembly Follow D pin Bushing Assembly Steps 5 through 31 in this section TOP PAD DISASSEMBLY 1 Chock the front wheels 2 Support the frame 3 Disconnect the height c...

Page 45: ...if equipped see Figure 8 29 FIGURE 8 29 SERVICE HINT Due to certain pinion angle configuration the removal of the D pin bolts may be necessary to access the U bolt locknuts THE USE OF A FLOOR JACK EQUIPPED WITH A FOUR INCH SUPPORT PLATE IS MANDATORY TO SUPPORT THE SUPPORT BEAM AND CROSS TUBE ASSEMBLY DO NOT USE A BOTTLE JACK THE USE OF A BOTTLE JACK WILL NOT ENGAGE THE CROSS TUBE TO FACILITATE SAF...

Page 46: ...he proper torque DO NOT exceed specified torque on U bolt locknuts Tight en the locknuts to 350 400 foot pounds torque 6 Tighten the D pin bolts to 275 325 foot pounds torque if loosened or removed during disassembly see Figure 8 30 7 Remove the support from the support beam assembly 8 Install the through bolt on the longitudinal torque rod DO NOT tighten at this time 9 See additional Air Spring C...

Page 47: ...t Safety Notice Section of this publication prior to deflating or inflating the air system SOME VEHICLE APPLICATIONS SUCH AS VEHICLES EQUIPPED WITH OUTRIGGERS RETAIN SOME PRESSURE IN THE AIR SPRINGS AT ALL TIMES PRIOR TO PERFORMING ANY MAINTENANCE SERVICE OR REPAIR OF THE SUSPENSION VERIFY EACH AIR SPRING IS COMPLETELY DEFLATED FAILURE TO DO SO COULD RESULT IN SERIOUS PROPERTY DAMAGE AND OR SEVERE...

Page 48: ... the clamp group and discard 15 Remove the bottom cap and inspect for damage or wear Replace as necessary ASSEMBLY FIGURE 8 33 1 Install the top pad on the top of the axle engaging the dowel pin Care should be taken to ensure the thicker ear of the top pad is mounted to the inboard side of the suspension see Fig ure 8 33 2 Install the bottom cap and axle spacer if equipped on the axle in the prope...

Page 49: ...he full engagement of the D pins into the bottom caps 9 Prior to tightening the D pin fasteners verify the bottom cap is centered over the support beam 10 Tighten the D Pin locknuts to 275 325 foot pounds torque FIGURE 8 36 11 Tighten the U bolt locknuts evenly in 50 foot pounds increments in the proper pattern to achieve uniform bolt tension see Figure 8 36 12 Rap the top of the U bolts with a de...

Page 50: ...p on the frame 2 Install new mounting fasteners 3 Tighten axle stop fasteners to the vehicle manufacturers torque specifications 4 Remove the wheel chocks FRAME HANGER THIS PROCEDURE TO REPLACE A FRAME HANGER IS DONE WITH THE OTHER REMAINING FRAME HANGERS CONNECTED TO THE FRAME AND IT IS ALSO NECESSARY THAT THE SUPPORT BEAMS AND THE LONGITUDINAL TORQUE RODS ARE ATTACHED TO THE OTHER REMAINING FRAM...

Page 51: ...ts Section of this publication 8 Remove the fasteners that attach the longitudinal torque rod to the frame hanger 9 Remove the fasteners that attach the frame hanger to the vehicle per vehicle manufacturer specifications 10 Remove the frame hanger 11 Inspect mating components for any damage or wear replace as necessary 12 Inspect the QUIK ALIGN pivot bushing and torque rod bushings for wear or dam...

Page 52: ...steners and reinstall any shims that were removed during disassembly Tighten fasteners as per vehicle manufacturer s specifications 5 See additional Air Spring Cautions and Warnings in the Important Safety Notice Section of this publication prior to deflating or inflating the air system 6 Connect the leveling valve link rod s to the height control valve arm s to Inflate the suspension 7 Remove the...

Page 53: ...PRIMAAX EX PRIMAAX for Volvo Vehicles 17730 254 53 Component Replacement ...

Page 54: ...Torque Specifications 54 17730 254 HENDRICKSON RECOMMENDED TORQUE VALUES PROVIDED IN FOOT POUNDS SECTION 9 Torque Specifications PRIMAAX EX ...

Page 55: ... beam Assembly To QUIK ALIGN Bushing 2 1 8 UNC 525 575 3 U beam Assembly To Center D pin Bushing 4 16 UNF 275 325 4 U bolt Locknuts 8 16 UNF 350 400 5 Upper Shock Mount Locknuts 2 10 UNC 175 200 6 Lower Shock Mount Locknuts 2 5 8 11 UNC 200 225 7 Air Spring Assembly To Lower Air Spring Mounting Bracket 4 13 UNC 20 30 NOTE Quantities shown are per axle Double for tandem triple for tridem Torque val...

Page 56: ...Torque Specifications 56 17730 254 HENDRICKSON RECOMMENDED TORQUE VALUES PROVIDED IN FOOT POUNDS PRIMAAX for Volvo Vehicles PRIMAAX ...

Page 57: ...2 1 8 UNC 525 575 3 U beam Assembly to Center D pin Bushing 4 16 UNF 275 325 4 U beam Assembly to Cross Tube End Cap 2 7 8 9 UNC 525 575 5 U bolt Locknuts 8 16 UNF 350 400 6 Upper Shock Mount Locknuts 2 10 UNC 175 200 7 Lower Shock Mount Locknuts 2 5 8 11 UNC 200 225 8 Air Spring Assembly to Lower Air Spring Mounting Bracket 4 13 UNC 20 30 NOTE Quantities shown are per axle Double for tandem tripl...

Page 58: ...correctly Adjust ride height to proper setting See Ride Height Adjustment in the Alignment Adjustments Section Broken support beam Replace support beam assembly Suspension is noisy Loose QUIK ALIGN attachment Replace QUIK ALIGN connection and check suspension alignment adjust if necessary Loose U bolts Tighten U bolts to specifications see Preventive Maintenance Section Loose end caps Inspect end ...

Page 59: ...tem and check ride height See the vehicle manufacturer for proper ride height adjustment Height control valve dump port activated Check height control valve dump port for proper connection and function Air springs deflate when parked Leak in air system Inspect air fittings see Air Fitting Inspection in the Preventive Maintenance Section of this publication If necessary repair air system and check ...

Page 60: ...t are not reflected 2012 Hendrickson USA L L C U S Rights Hendrickson International Corporation Rights Outside U S All Rights Reserved 17730 254 Rev B 03 12 Printed in United States of America Truck Commercial Vehicle Systems 1 866 755 5968 Toll free U S and Canada 800 South Frontage Road 630 910 2800 Outside U S and Canada Woodridge IL 60517 4904 USA Fax 630 910 2899 ...