Q PlusTM LX500 and MX500 Cam Brakes
Contents
1. When you empty vacuum cleaners and handle used rags wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA to minimize exposure When you replace a HEPA filter wet the filter with a fine mist of water and dispose of the used filter with care 5 Worker Clean Up After servicing brakes wash your hands before you eat drink or smoke Shower after work Do not wear work clothes home Use a vacuum equipped with a HEPA filter to vacuum work clothes after they are worn Launder them separately Do not shake or use compressed air to remove dust from work clothes 6 Waste Disposal Dispose of discarded linings used rags cloths and HEPA filters with care such as in sealed plastic bags Consult applicable EPA state and local regulations on waste disposal Regulatory Guidance References to OSHA NIOSH MSHA and EPA which are regulatory agencies in the United States are made to provide further guidance to employers and workers employed within the United States Employers and workers employed outside of the United States should consult the regulations that apply to them for further guidance Sa Exploded Views MERITOR 15 INCH O PLUS LX500 AND MX500 CAST SPIDER BRAKE Rem Description kem Description Jesper Shoe and lining assembly Spring brake shoe Washer spacing Spring shoe retaining A Snap ring camshaft z 7 Cast Spider brake Bushing anchor pin Dust shield ES Seal chamber2. 2 Respiratory Protection OSHA has set a maximum allowable level of exposure for silica of 0 1 mg m as an 8 hour time weighted average Some manufacturers of non asbestos brake linings recommend that exposures to other ingredients found in non asbestos brake linings be kept below 1 0 f cc as an 8 hour time weighted average Scientists disagree however to what extent adherence to these maximum allowable exposure levels will eliminate the risk of disease that can result from inhaling non asbestos dust Therefore wear respiratory protection at all times during brake servicing beginning with the removal of the wheels Wear a respirator equipped with a high efficiency HEPA filter approved by NIOSH or MSHA if the exposure levels may exceed OSHA or manufacturers recommended maximum levels Even when exposures are expected to be within the maximum allowable levels wearing such a respirator at all times during brake servicing will help minimize exposure 3 Procedures for Servicing Brakes a Enclose the brake assembly within a negative pressure enclosure The enclosure should be equipped with a HEPA vacuum and worker arm sleeves With the enclosure in place use the HEPA vacuum to loosen and vacuum residue from the brake parts b As an alternative procedure use a catch basin with water and a biodegradable non phosphate water based detergent to wash the brake drum or rotor and other brake parts The solution should be applied with low p
3. 4 gt Assembly MERITOR Install Camshaft Seals and Bushings Figure 4 1 A WARNING To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service Asbestos and Non Asbestos A Fibers Warning Some brake linings contain asbestos fibers a cancer and lung disease hazard Some brake linings contain non asbestos fibers whose long term effects to health are unknown You must use caution when you handle both asbestos and non asbestos materials NOTE To help avoid shorter lining life Meritor recommends replacing springs rollers and anchor pins at each reline Figure 4 1 STAMPED SPIDER VERSION Camshaft seals closed end SPACER WASHER THICK towards slack adjuster RETAINING RING SPACER WASHERS 0 03 0 762 mm MAX END PLAY STEEL BACKED g BUSHING SEAL ORANGE SLACK ADJUSTER SEAL SEAL BLACK ORANGE Seal lip towards slack adjuster BUSHING BLACK COMPOSITE CAMSHAFT CAST SPIDER VERSION Seal lip towards slack adjuster SPECIAL CAMHEAD SEAL WASHER FOR USE WITH STAMPED SPIDER BRAKES ONLY 10 2 MERITOR 1 Check that all the spider mounting bolts are tightened to the correct torque specified in Figure 4 2 Q Figure 4 2 7 16 20 60 75 LB FT 81 102 Nem 1 2 20 85 115 LB FT 115 156 Nem 9 16 18 130 165 LB FT 176 224 Nem 5 8 18 180 230 LB FT 244 312 Nem A CAUTION To disassemble the bracket from the spider remove
4. MERITOR 16 5 Q PLUS NO BULGE MERITOR 16 5 Q PLUS STAMPED ON WEB SHOE TAG 16 5 SHOE FMSI NO 4702 USED WITH SPIDER 16 RIVET HOLES IN TABLE MERITOR 15 Q PLUS MERITOR 15 Q PLUS STAMPED ON WEB DOUBLE WEB 15 SHOE CAM TIP TO TIP 4 25 PART NUMBER LOCATED HERE 16 5 Q PLUS LOCATED HERE 16 5 CAM 1 5 DIA 28 SPLINES CAM TIP TO TIP 3 38 PART NUMBER LOCATED HERE 0 988 DIA LOCATED HERE 15 CAM 1 5 DIA 28 SPLINES A Section 4 MERITOR Assembly 1 Put the upper brake shoe in position on the 3 Pull each brake shoe away from the cam to top anchor pin Hold the lower brake shoe on permit enough space to install the cam rollers the bottom anchor pin and install two new and retainers Press the ears of the retainer brake shoe retaining springs Figure 4 7 together to permit the retainer to fit between the brake shoe webs Figure 4 9 4 Push the retainer into the brake shoe until its ears lock in the holes in the shoe webs Figure 4 10 Figure 4 7 Figure 4 9 SQUEEZE 2 Rotate the lower brake shoe forward and install a new brake shoe return spring Install the open end of the spring hooks toward the camshaft Figure 4 8 NOTE Use of a spring tool may be required to assemble the new brake shoe return spring Figure 4 10 Figure 4 8 13 Section 4 Assembly Installing Meritor s Automatic Slack Adjuster Handed and Unhanded Slack Adjusters T
5. both wheels of a single axle and all four wheels of a tandem axle at the same time Always install the same linings and drums on both wheels of a single axle and all four wheels of a tandem axle It is not necessary for front and rear axles to have the same linings and drums 19 Section 6 gt Lubrication MERITOR Lubrication Intervals for Lubricating the Q Plus LX500 and O Plus LX500 and MX500 MX500 Cam Brakes and Automatic Time or Mileage Intervals Slack Adjusters g 1 Remove the identification tag from the A WARNING chamber bracket To prevent serious eye injury always wear safe 2 Remove the grease plugs from both the eye protection when you perform vehicle chamber bracket and the automatic slack maintenance or service adjuster The O Plus LX500 and MX500 Cam Brake 3 Install the grease fittings Use Meritor approved packages include factory installed Meritor synthetic grease O 695 NLGI Grade 2 to automatic slack adjusters Q Plus LX500 and lubricate the brake assembly through the MX500 cam brakes and slack adjusters do not grease fitting in the bracket until new grease require lubrication for an extended period of time flows from the inboard slack end seal Refer tothe table below 4 Use Meritor approved synthetic grease O 695 The camshaft hardware seals bushings and to lubricate the automatic slack adjuster washers do not require replacement for the same through the grease fitting until new grease time pe
6. bracket 4 Anchor pin brake shoe Capscrew dust shield 15 Bracket camshaft amp ECH Washer camhead Capscrew chamber Orange seal ASA bracket 7 Orange seal camshaft Bushing camshaft 1 50 I D Bushing camshaft Plug pipe a 1 625 I D Washer EE Seal camshaft Roller brake shoe Slack adjuster automatic Retainer shoe roller gt MERITOR Exploded Views 16 5 INCH O PLUS DRIVE AXLE LX500 AND MX500 STAMPED SPIDER BRAKE term Description kem Description iem Description Shoe and lining assembly Spring brake shoe Dust shield 7 Se t z Spring shoe retaining ed Capscrew dust shield 13 St d spider brak Bushing anchor pin et Sp L e S Seal ASA t Anchor pin brake shoe eae Orange seal ASA Camshaft S head GEET Washer 4 hard Washer camhead Plug pipe Nut 4 Grade 8 1 625 I D 18 Slack adjuster Seal camshaft Roller brake shoe Washer spacing Retainer shoe roller Snap ring camshaft Orange seal camshaft 17 Washer camshaft Bushing camshaft i 1 50 I D ea Bushing camshaft thick 50 Section 1 Introduction O Plus LX500 Cam Brake Package with the Extended Lube Feature A WARNING To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service NOTE You must continue to observe all o
7. ft 88 115 Nem 70 100 Ib ft 95 136 Nem 100 115 Ib ft 136 156 Nem 27 ArvinMeritor Commercial Vehicle Systems Meritor Heavy Vehicle Systems LLC 2135 West Maple Road Troy MI 48084 USA 800 535 5560 arvinmeritor com DRIVETRAIN PLUS THE COMPLETE SYSTEM A Gabriel Beon BEGGS ween J ArvinMeritor Information contained in this publication was in effect at the time the publication was approved for printing and is subject to change without notice or liability Meritor Heavy Vehicle Systems LLC reserves the right to revise the information presented or discontinue the production of parts described at any time Copyright 1997 Maintenance Manual MM 96173 ArvinMeritor Inc Issued 06 97 All Rights Reserved Printed in the USA 16579 24240
8. non smokers Symptoms of these diseases may not become apparent for 15 20 or more years after the first exposure to asbestos Accordingly workers must use caution to avoid creating and breathing dust when servicing brakes Specific recommended work practices for reducing exposure to asbestos dust follow Consult your employer for more details Recommended Work Practices 1 Separate Work Areas Whenever feasible service brakes in a separate area away from other operations to reduce risks to unprotected persons OSHA has set a maximum allowable level of exposure for asbestos of 0 1 f cc as an 8 hour time weighted average and 1 0 f cc averaged over a 30 minute period Scientists disagree however to what extent adherence to the maximum allowable exposure levels will eliminate the risk of disease that can result from inhaling asbestos dust OSHA requires that the following sign be posted at the entrance to areas where exposures exceed either of the maximum allowable levels DANGER ASBESTOS CANCER AND LUNG DISEASE HAZARD AUTHORIZED PERSONNEL ONLY RESPIRATORS AND PROTECTIVE CLOTHING ARE REQUIRED IN THIS AREA 2 Respiratory Protection Wear a respirator equipped with a high efficiency HEPA filter approved by NIOSH or MSHA for use with asbestos at all times when servicing brakes beginning with the removal of the wheels 3 Procedures for Servicing Brakes a Enclose the brake assembly within a negative pressure enclosure The enclosure s
9. the bolts Rotate the bracket wing to loosen the bracket Do not hit the end of the chamber bracket tube that protrudes from the spider Damage to components can result 2 If the camshaft bracket was removed install the O ring and bracket on the spider Tighten the capscrews to the correct torque specified in the table in Section 10 A WARNING To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service Prior to installing the camshaft into the brake 3 Clean the journals with an emery cloth 4 Lubricate the camshaft splines with Meritor specification O 695 NLGI Grade 2 lubricant For Brake Assemblies with Cast Spiders e Install one seal and bushing in the spider e Install one seal and bushing in the chamber bracket tube Figure 4 1 Section 4 Assembly For Brake Assemblies with Stamped Spiders e Install both seals and bushings in the chamber bracket tube Figure 4 1 1 Use a seal driver to install new camshaft bushings and seals in the spider and camshaft bracket Figure 4 3 Figure 4 3 A CAUTION You must install both seals with the lips facing TOWARD the automatic slack adjuster so that grease can purge from the slack adjuster end of the camshaft If grease purges from the cam end damage to components can result 2 Install the seals with the seal lips facing TOWARD the automatic slack adjuster Figure 4 4 Figure 4 4 CAMSHAFT
10. to overadjust or underadjust Brake drag increased stopping distances and damage to components can occur Measure the Automatic Slack Adjuster 1 Use Meritor s automatic slack adjuster template part number TP 4786 to measure the length of the slack adjuster Figure 4 17 The marks by the holes in the small end of the template indicate the length of the slack adjuster Figure 4 18 Figure 4 17 O O 0000 Template Number Brake Description Dark TP 4786 Truck or tractor drum brake brown Color of Part A Section 4 MERITOR Assembly 4 Check for these specifications Figure 4 18 e Thread engagement between the clevis and the push rod must be at least 1 2 inch 12 7 mm Figure 4 20 Measure slack e The push rod must not extend through the adjuster arm length clevis more than 1 8 inch 3 18 mm If necessary cut the push rod or install a new push rod with a new air chamber Figure 4 20 CAMSHAFT CENTER MINIMUM 1 2 Ee ee Installing a Threaded Clevis 1 Install the large clevis pin through the large holes in the template and the clevis 2 Select the hole in the template that matches the length of the slack adjuster Hold that hole on the center of the camshaft THREADED CLEVIS 3 Look through the slot in the template If necessary adjust the position of the clevis until the small hole in the clevis is completely 5 Tighten the jam nut against the clevis to visible
11. 4 Assembly A CAUTION You must disengage a pull pawl or remove a conventional pawl before rotating the manual adjusting nut or you will damage the pawl teeth A damaged pawl will not allow the slack adjuster to automatically adjust brake clearance Replace damaged pawls before putting the vehicle in service 6 Disengage the pawl Turn the manual adjusting nut to align the holes in the slack adjuster arm and the clevis Figure 4 14 A CAUTION Always replace used clevis pin retainer clips with new ones when servicing the automatic slack adjuster or chamber Do not reuse clevis pin retainer clips after removing them Discard used clips When removed for maintenance or service clevis pin retainer clips can be bent or gapped apart and can lose retention Damage to components can result For a Welded Clevis 7 Apply anti seize compound to the two clevis pins Install the clevis pins through the clevis and the slack adjuster 8 Install the cotter pins or clevis pin retainer clips to hold the clevis pins in place Figure 4 15 For a Threaded Clevis e Refer to Installing a Threaded Clevis on page 17 Figure 4 14 Disengage pawl Figure 4 15 LARGE CLEVIS PIN AND RETAINER CLIP CLEVIS E LARGE CLEVIS PIN RETAINER CLIP AED P N 2257 D 1174 e SMALL CLEVIS PIN RETAINER CLIP P N 2257 C 1173 SMALL CLEVIS PIN AND RETAINER CLIP The clevis pin retainer clips must be fully installed
12. BRACKET 11 Section 4 Assembly 3 Install the cam head washer onto the camshaft with the bent flaps toward the spider 4 Apply Meritor specification O 695 synthetic grease to the camshaft bushings and journals 5 Install the camshaft through the spider and bracket so that the camshaft turns freely by hand Figure 4 5 Figure 4 5 Install Brake Shoes Before Specified Time or Mileage Lubrication Intervals When you install brake shoes on O Plus LX500 and MX500 cam brakes BEFORE the specified time or mileage lubrication intervals only grease clevis pins anchor pins and shoe rollers Refer to Do Not Lubricate the LX500 and MX500 Brakes and Automatic Slack Adjusters Before Specified Time or Mileage Intervals in Section 6 of this manual After Specified Time or Mileage Lubrication Intervals When you install brake shoes on O Plus LX500 and MX500 cam brakes after the specified time or mileage lubrication intervals refer to Lubricating the O Plus LX500 and MX500 Cam Brakes and Automatic Slack Adjusters After Specified Time or Mileage Intervals in Section 6 of this manual for service procedures 12 A MERITOR O Plus LX500 and MX500 Specifications The illustrations below show specifications for 15 inch and 16 5 inch O Plus LX500 and MX500 cam brake shoes and cams Figure 4 6 Figure 4 6 COMPONENTS FMSI NO 4707 PLUS SHAPED HOLES STAMPED IN TABLE 28 RIVET HOLES IN TABLE
13. Gree Diameter Tere e the center of the large clevis pin on all the ype BEES WAS 16 brakes Figure 9 3A Record each dimension 3 Have another person apply and hold one full 20 brake application Figure 9 3B Se 4 Repeat Step 2 and measure with the service brakes applied Figure 9 3C Record each 30 dimension 36 Release the brakes Calculate the adjusted chamber stroke of each Long Stroke Clamp Type Brake brak Chamber Data a Subtract the dimension that was measured in Step 2 from the dimension measured in Step 4 Outside Diameter Brake Adjustment Type inches Limit inches b The difference between the two dimensions 16 2 0 is the adjusted chamber stroke The adjusted chamber stroke must not be greater than the 20 2 0 stroke length shown in the CVSA reference 24 2 0 charts for that size and type of air chamber bie SE c If the adjusted chamber stroke you measured is greater than the maximum 30 2 5 stroke shown in the CVSA reference charts inspect and replace the slack adjuster if necessary For 3 maximum stroke type 24 chambers Figure 9 3A Figure 9 3B Figure 9 3C Measure Measure e Spring brakes d e Spring brakes released released e Service brakes N er e Service brakes not applied 100 psi 689 kPa In alr applied tank engine OFF 26 Sa MERITOR Section 10 Torque Table Fastener Torque Table for Q Plus LX500 and MX500 Brakes DUST SHIELD MOUNTING 4 or 6 CAST
14. MERITOR an ArvinMeritor brand Issued 06 97 Q Plus LX500 and MX500 Cam Brakes Maintenance Manual MM 961 73 Sa Service Notes MERITOR This maintenance manual describes the correct service and repair procedures for Meritor Q Plus LX500 and MX500 cam brakes The information contained in this manual was current at time of printing and is subject to change without notice or liability You must follow your company procedures when you service or repair equipment or components You must understand all procedures and instructions before you begin to work on a unit Some procedures require the use of special tools for safe and correct service Failure to use special tools when required can cause serious personal injury to service personnel as well as damage to equipment and components Meritor uses the following notations to warn the user of possible safety problems and to provide information that will prevent damage to equipment and components A WARNING NOTE A NOTE indicates an operation procedure A WARNING indicates a procedure that or instruction that is important for proper service you must follow exactly to avoid serious A NOTE can also supply information that will personal injury help to make service quicker and easier AX caution a A CAUTION indicates a procedure that This symbol indicates that fasteners must you must follow exactly to avoid damaging be tightened to a specific torque equipment or componen
15. MX500 Cam Brakes and Automatic Slack Adjusters After Specified Time or Mileage Intervals Section 7 E LE EE Section 8 Recommended Periodic Service Recommended Periodic Service 0 000 cece cee eee eee eee Section 9 Inspection Brake Inspections Before the Recommended Lubrication Interval Brake Inspections After the Recommended Lubrication Interval Visual INSpeCctiOn 3 wrk AE Shel ee pla tele A ele eek biota ad Federal Roadside Inspection Brake In Service Adjustment Inspection TUCK OF Tractor neren Sec enced se ths aie kal Moe E wee eae UR AS Section 10 Torque Table Sa MERITOR MERITOR Asbestos and Non Asbestos Fibers A ASBESTOS FIBERS WARNING The following procedures for servicing brakes are recommended to reduce exposure to asbestos fiber dust a cancer and lung disease hazard Material Safety Data Sheets are available from Meritor Hazard Summary Because some brake linings contain asbestos workers who service brakes must understand the potential hazards of asbestos and precautions for reducing risks Exposure to airborne asbestos dust can cause serious and possibly fatal diseases including asbestosis a chronic lung disease and cancer principally lung cancer and mesothelioma a cancer of the lining of the chest or abdominal cavities Some studies show that the risk of lung cancer among persons who smoke and who are exposed to asbestos is much greater than the risk for
16. SPIDER Tighten dust shield mounting screws 0 375 16 Grade 5 to 25 35 Ib ft 34 48 Nem STAMPED SPIDER Tighten dust shield mounting screws 0 312 18 Grade 5 to 15 20 Ib ft 20 27 Nem BRAKE MOUNTING BOLTS CAM BRACKET MOUNTING 4 500 13 Thread Cast Spider Grade 8 90 120 Ib ft 122 163 Nem Grade 5 65 100 lb ft 88 136 N m 562 12 Thread Stamped Spider PUSH ROD LOCK NUT 1 Grade 8 180 190 Ib ft 243 257 Nem 625 18 Thread 25 50 Ib ft 34 68 Nem 500 20 Thread 20 30 Ib ft 27 41 Nem Add camshaft spacing Grade 8 bolts with lock nuts and two hardened washers on each bolt Bolt Size Torque AN washers to provide between 0 005 0 030 0 13 0 76 mm AIR CHAMBER MOUNTING 2 maximum end play CAST SPIDER STAMPED SPIDER Tighten chamber Tighten chamber bracket mounting bracket Grade 8 bolts mounting nuts to 1 2 20 85 115 lb ft 115 156 Nem 130 165 Ib ft 176 223 Nem 5 8 18 180 230 Ib ft 243 311 Nem 9 16 18 Grade 5 65 85 lb ft 180 19 Ib ft 88 116 Nem 244 257 Ne m Grade 8 90 120 Ib ft 122 163 Nem Grade 8 Nuts and Hard Flat Washers AN chambersico ve 20 e e e Spine Ghanbor Bendix Midland ee 40 Ib ft 48 54 Nem a 110 115 Ib ft with hex nut and washer 149 203 Nem 85 95 Ib ee ah with lock nut and washer 115 129 ee ah 30 45 Ib ft 41 61 Nem 35 50 lb ft 48 68 Nem 45 65 Ib ft 61 88 Nem 65 85 lb
17. Use a wrench to turn the manual adjusting nut until the brake shoes are fully retracted 8 Remove the screwdriver so the pawl snaps back into engagement 9 Use standard procedures to remove the wheels and drums from the axle MERITOR Section 2 Disassembly Remove Brake Shoes 1 Push down on the bottom brake shoe and pull on the roller retaining clip to remove the bottom cam roller Figure 2 2 2 Lift the top brake shoe and pull on the roller retaining clip to remove the top cam roller 3 Lift the bottom shoe to release the tension on the brake return spring Remove the spring Figure 2 3 4 Rotate the bottom shoe to release the tension on the two retaining springs Remove the springs and brake shoes Figure 2 4 Figure 2 2 Figure 2 4 Remove Camshaft and Slack Adjuster NOTE Meritor recommends checking the bushings at every reline If the bushings need replacement follow the procedure listed below 1 Remove the large and small clevis pins A CAUTION You must disengage a pull pawl or remove a conventional pawl before rotating the manual adjusting nut or you will damage the pawl teeth A damaged pawl will not allow the slack adjuster to automatically adjust brake clearance Replace damaged pawls before putting the vehicle in service 2 Disengage the pull pawl Rotate the slack adjuster away from the clevis NOTE You cannot remove a welded clevis from the chamber assembly If the welde
18. and positioned around the side of clevis pin 15 Section 4 Assembly A MERITOR Checking Brake Chamber Push Rod Stroke and Adjusting the Clevis Position NOTE You cannot adjust the clevis position on a chamber push rod that is equipped with a welded clevis There are two methods you can use to adjust the clevis position on a chamber push rod that is equipped with a threaded clevis e The Brake Slack Adjuster BSAP method e Meritor s automatic slack adjuster template for standard stroke chambers only Brake Slack Adjuster Position BSAP Method When installing the automatic slack adjuster verify that the BSAP dimension of the chamber matches the table in Figure 4 16 Figure 4 16 3 750 BRACKET OFFSET BSAP 0 125 LENGTH 5 50 Standard Stroke Long Stroke inch inch NOTE A welded clevis is long stroke only 16 Meritor s Automatic Slack Adjuster Template Order the correct automatic slack adjuster template from Meritor s Customer Service Center at 800 535 5560 Specify part number TP 4786 for truck or tractor drum brakes A CAUTION Use Meritor s dark brown automatic slack adjuster template for truck or tractor drum brakes part number TP 4786 to ensure that you install the automatic slack adjuster correctly This template is not interchangeable with other Meritor slack adjuster templates An incorrect installation can cause the automatic slack adjuster
19. ary All Other 1 year regardless of mileage r Applications Mobiltemp SHC 32 Industrial Q Plus MX500 Cam Brake Aerospace Lubricants Inc On Highway 3 years 500 000 miles E Linehaul 805 000 km 0 692 Amoco Super Permalube 2 Citgo Premium Lithium EP 2 2 Exxon Ronex MP 2 2 Kendall L 427 Super Blu 2 Mobilith AW 1 1 Sohio Factran EP 2 2 0 695 EVO LUBE TEK 615 Meritor NLGI Outside Component Specification Grade Grease Type Temperature Camshaft Splines and 0 695 2 Synthetic Polyurea 40 F 40 C Clevis Pins R temperature service necessary lubricate the limits anchor pins where they i touch the brake shoes 0 645 Synthetic Oil Clay Down to 65 F 54 C Base 0 692 1 and 2 Lithium Base Down to 40 F 40 C Shoe Rollers 1 Lithium 12 Hydroxy Refer to the grease When the brake is Stearate or manufacturer s disassenibled or when 2 Lithium Complex specifications for the go temperature service necessary lubricate the limits rollers where they touch i the brake shoes DO NOT get grease on the part of Anchor Pins 1 Lithium 12 Hydroxy Refer to the grease When the brake i Stearate or manufacturer s ASTANE PAREIS 2 Lithium Complex specifications for the disassembled or when the roller that touches the cam head Automatic Slack 0 695 2 Synthetic Polyurea 40 F 40 C Adjusters 21 Section 7 gt Diagnostics MERITOR A WARNING To prevent serious eye injury alw
20. ays wear safe eye protection when you perform vehicle maintenance or service Symptoms Possible Causes Corrective Actions e Adjusted stroke Incorrect slack adjuster part number e Check with Warehouse Distributor or is too long Original Equipment Manufacturer e No adjustment e Clevis installed at wrong angle e Use correct template or BSAP setting to install clevis correctly e Excessive wear between clevis and collar e Replace with threaded clevis more than 0 060 1 52 mmh e Loose jam nut at clevis e Tighten to specification e Worn clevis pin bushing in slack arm ID e Replace bushing larger than 0 53 13 46 mm e Weak or broken return spring in air chamber Replace return spring or air chamber Spring force must be at least 32 Ib 142 4 N at first push rod movement e Spring brake does not retract fully e Repair or replace spring brake e Worn or stripped teeth on pawl or actuator e Replace slack adjuster High torque is required to rotate worm when e Replace slack adjuster slack is removed from vehicle e In service slack maximum worm torque 45 Ib in 5 09 Nem AN e New or rebuilt slack maximum worm torque 25 Ib in 2 83 Nem AN e Excessive looseness between splines of e Replace powershaft gear or camshaft and ASA gear automatic slack adjuster as needed e Worn components cam bushing for e Replace components example in foundation brake e Adjusted stroke Non Original Equipment Manufactu
21. c solvents flammable solvents or solvents that can damage brake components as wetting agents 4 Cleaning Work Areas Clean work areas with a vacuum equipped with a HEPA filter or by wet wiping NEVER use compressed air or dry sweeping to clean work areas When you empty vacuum cleaners and handle used rags wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA for use with asbestos When you replace a HEPA filter wet the filter with a fine mist of water and dispose of the used filter with care 5 Worker Clean Up After servicing brakes wash your hands before you eat drink or smoke Shower after work Do not wear work clothes home Use a vacuum equipped with a HEPA filter to vacuum work clothes after they are worn Launder them separately Do not shake or use compressed air to remove dust from work clothes 6 Waste Disposal Dispose of discarded linings used rags cloths and HEPA filters with care such as in sealed plastic bags Consult applicable EPA state and local regulations on waste disposal Regulatory Guidance References to OSHA NIOSH MSHA and EPA which are regulatory agencies in the United States are made to provide further guidance to employers and workers employed within the United States Employers and workers employed outside of the United States should consult the regulations that apply to them for further guidance A NON ASBESTOS FIBERS WARNING The following procedures for servicing brakes ar
22. d clevis is damaged or worn replace the chamber assembly To remove a threaded clevis loosen the jam nut and unthread the clevis from the brake chamber rod 3 Remove the snap ring washer spacing washer and orange Automatic Slack Adjuster ASA seal from the camshaft Remove the slack adjuster from the camshaft Pull the camshaft from the spider and bracket Section 3 Prepare Parts for Assembly A MERITOR A WARNING To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service Solvent cleaners can be flammable poisonous and cause burns Examples of solvent cleaners are carbon tetrachloride emulsion type cleaners and petroleum based cleaners To avoid serious personal injury when you use solvent cleaners you must carefully follow the manufacturer s product instructions and these procedures e Wear safe eye protection e Wear clothing that protects your skin e Work in a well ventilated area e Do not use gasoline or solvents that contain gasoline Gasoline can explode e You must use hot solution tanks or alkaline solutions correctly Follow the manufacturer s instructions carefully A CAUTION Do not use hot solution tanks or water and alkaline solutions to clean ground or polished parts Damage to parts will result Only use solvent cleaners on metal parts Damage to parts will result Cleaning Parts AX caution Do not disassemble the factor
23. e adjusting nut e For a new slack adjuster the torque MUST remain less than 25 Ib in 2 8 Nem for 360 degrees AN e For an in service slack adjuster the torque MUST remain less than 40 Ib in 4 52 Nem for 360 degrees o Figure 3 1 ROTATE GEAR 360 A CAUTION Do not disassemble the factory installed automatic slack adjusters on Meritor s O Plus LX500 and MX500 cam brakes Damage to components can result e If the torque value exceeds the specifications the slack adjuster is not working correctly Inspect and replace the slack adjuster as necessary Drums NOTE Meritor recommends that you do not turn or rebore a brake drum Turning or reboring drums can decrease the strength and heat capacity of the drum 1 Check the brake drums for cracks severe heat checking heat spotting scoring pitting and distortion Replace drums as required 2 Measure the inside diameter of the drum in several locations with a drum caliper or internal micrometer Figure 3 2 Replace the drum if the diameter exceeds the specifications supplied by the drum manufacturer A WARNING Do not operate the vehicle with the brake drum worn or machined beyond the discard dimension indicated on the drum The brake system may not operate correctly Damage to components and serious personal injury can result 3 Check dust shields for rust and distortion Repair or replace damaged shields as necessary Figure 3 2 Section
24. e recommended to reduce exposure to non asbestos fiber dust a cancer and lung disease hazard Material Safety Data Sheets are available from Meritor Hazard Summary Most recently manufactured brake linings do not contain asbestos fibers These brake linings may contain one or more of a variety of ingredients including glass fibers mineral wool aramid fibers ceramic fibers and silica that can present health risks if inhaled Scientists disagree on the extent of the risks from exposure to these substances Nonetheless exposure to silica dust can cause silicosis a non cancerous lung disease Silicosis gradually reduces lung capacity and efficiency and can result in serious breathing difficulty Some scientists believe other types of non asbestos fibers when inhaled can cause similar diseases of the lung In addition silica dust and ceramic fiber dust are known to the State of California to cause lung cancer U S and international agencies have also determined that dust from mineral wool ceramic fibers and silica are potential causes of cancer Accordingly workers must use caution to avoid creating and breathing dust when servicing brakes Specific recommended work practices for reducing exposure to non asbestos dust follow Consult your employer for more details Recommended Work Practices 1 Separate Work Areas Whenever feasible service brakes in a separate area away from other operations to reduce risks to unprotected persons
25. ed fa wpe SOR ead ae ore a Remove Camshaft and Slack Adjuster Section 3 Prepare Parts for Assembly Cleaning Pants vice nee eee ote oe bes et EE ee eee eae Ee Dry Parts After Cleaning Corrosion Protection Inspect Parts Slack Adjusters auie geheie A ew bade ae eas kt Oe as Drums Section 4 Assembly Install Camshaft Seals and BushingS For Brake Assemblies with Cast Spiders For Brake Assemblies with Stamped Spiders Install Brake ShoeS Before Specified Time or Mileage Lubrication Intervals After Specified Time or Mileage Lubrication Intervals Q Plus LX500 and MX500 Specifications Installing Meritor s Automatic Slack Adjuster 0 0 0 000 e een eee eee Handed and Unhanded Slack Adjusters Pull Pawls Installation Procedure Checking Brake Chamber Push Rod Stroke and Adjusting the Clevis Position Brake Slack Adjuster Position BSAP Method Meritor s Automatic Slack Adjuster Template Adjust the Brake oii tains SR Bele Ra A oe KE MA teg KEN Abel og aot al ect BA EASE a Section 5 Reline the Brakes Relinesthe Brakes 2 2 Cocu rea AE aks SCENE A eee eas Ye ee ale STEEN ee eee Pe Table of Contents Section 6 Lubrication Lubrication Intervals for O Plus LX500 and MX500 Cam Brakes with Automatic Slack Adjusters Do Not Lubricate the LX500 and MX500 Brakes and Automatic Slack Adjusters Before Specified Time or Mileage Intervals Lubricating the O Plus LX500 and
26. eed 1 009 inches 25 63 mm in diameter The distance from the center of the anchor pin hole to the center of the roller hole must not exceed 12 779 inches 32 46 cm Replace any shoe with measurements that do not meet specifications 5 Check the camshaft for cracks wear and corrosion Check the cam head bearing journals and splines Replace damaged camshafts Sa MERITOR Section 3 Prepare Parts for Assembly Slack Adjusters AA CAUTION Always replace used clevis pin retainer clips with new ones when servicing the automatic slack adjuster or chamber Do not reuse clevis pin retainer clips after removing them Discard used clips When removed for maintenance or service clevis pin retainer clips can be bent or gapped apart and can lose retention Damage to components can result You must disengage a pull pawl or remove a conventional pawl before rotating the manual adjusting nut or you will damage the pawl teeth A damaged pawl will not allow the slack adjuster to automatically adjust brake clearance Replace damaged paws before putting the vehicle in service 1 Check the clevis pins and the bushing in the arm of the slack adjuster Replace the pins if they are worn Replace the bushing if its diameter exceeds 0 531 inch 13 5 mm 2 Check Meritor automatic slack adjusters by rotating the adjusting nut to the LEFT with an inch pound torque wrench Figure 3 1 Turn the gear 360 degrees 22 rotations of th
27. ete Overhaul e At every second reline or as required A schedule for the periodic adjustment cleaning inspection and lubrication of the brake equipment must be made according to experience and the type of operation Brakes must be adjusted as frequently as required for correct operation and safety The adjustments must give correct clearance between the lining and drum correct pushrod travel and correct balance between the brakes NOTE Correctly adjust wheel bearings before adjusting the brake Brakes must be cleaned inspected and adjusted every time the wheel hubs are removed During a major overhaul the following parts must be carefully checked and replaced with genuine Meritor Replacement Parts if required 1 Spiders for distortion and loose bolts 2 Anchor pins for wear and correct alignment 3 Brake shoes for wear at anchor pin holes or roller slots Camshaft and camshaft bushings for wear Shoe return springs must be replaced Brake linings for grease on the lining wear and loose rivets or bolts 7 Drums for cracks deep scratches or other damage To help ensure maximum lining life Meritor recommends that springs rollers and anchor pins be replaced at each reline 23 Section 9 Inspection Brake Inspections Before the Recommended Lubrication Interval A WARNING To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service NOTE You do
28. here are two different automatic slack adjuster designs HANDED and UNHANDED For most applications install a HANDED automatic slack adjuster so that the pawl faces INBOARD on the vehicle The pawl can be on either side or on the front of the slack adjuster housing Figure 4 11 Pull Pawls Pull pawls are spring loaded Pry the pull pawl at least 1 32 inch to disengage the teeth Figure 4 12 When you remove the pry bar the pull pawl will re engage automatically Installation Procedure If you are installing a new automatic slack adjuster it must be the same type and size as the one you will replace The table below shows slack adjuster lengths for each brake chamber size Chamber and Slack Adjuster Sizes Length of Slack Size of Chamber Adjuster Inches Square Inches 5 1 2 16 20 24 30 36 1 Install the thick large O D spacing washer on the camshaft 2 Install the automatic slack adjuster seal on the camshaft in the direction shown in Figure 4 13 3 Install the slack adjuster on the splines of the camshaft 4 Install the orange slack adjuster seal in the direction shown in Figure 4 13 5 Place the appropriate number of spacing washers between the slack adjuster and the snap ring to ensure less than 0 020 inch 0 51 mm axial end play of the camshaft 14 Sa MERITOR Figure 4 11 HANDED UNHANDED Figure 4 12 PRY UP PULL PAWL a Figure 4 13 Sa MERITOR Section
29. hould be equipped with a HEPA vacuum and worker arm sleeves With the enclosure in place use the HEPA vacuum to loosen and vacuum residue from the brake parts b As an alternative procedure use a catch basin with water and a biodegradable non phosphate water based detergent to wash the brake drum or rotor and other brake parts The solution should be applied with low pressure to prevent dust from becoming airborne Allow the solution to flow between the brake drum and the brake support or the brake rotor and caliper The wheel hub and brake assembly components should be thoroughly wetted to suppress dust before the brake shoes or brake pads are removed Wipe the brake parts clean with a cloth c Ifan enclosed vacuum system or brake washing equipment is not available employers may adopt their own written procedures for servicing brakes provided that the exposure levels associated with the employer s procedures do not exceed the levels associated with the enclosed vacuum system or brake washing equipment Consult OSHA regulations for more details d Wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA for use with asbestos when grinding or machining brake linings In addition do such work in an area with a local exhaust ventilation system equipped with a HEPA filter e NEVER use compressed air by itself dry brushing or a vacuum not equipped with a HEPA filter when cleaning brake parts or assemblies NEVER use carcinogeni
30. me linings and drums All four wheel ends chambers when the brakes are fully applied of tandem axles also must have the same linings and drums It is not necessary for the front axle brakes to be the same as the rear driving axle brakes Figure 9 2 e Turn the engine OFF Apply and release the brakes to DECREASE the pressure to 100 psi 689 kPa e If necessary run the engine to INCREASE the pressure to 100 psi 689 kPa Figure 9 2 TANDEM AXLES FRONT AXLE v a ECH Both wheel ends of each axle must have identical drums and lining 6 Always follow the specifications supplied by the vehicle manufacturer for the correct lining to be used Vehicle brake systems must have the correct friction material and these requirements can vary from vehicle to vehicle 25 Section 9 gt Inspection MERITOR Truck or Tractor Commercial Vehicle Safety Alliance CVSA North American Out of Service Use the following procedures to check the Criteria Reference Charts in service adjustment adjusted chamber stroke of truck or tractor air brakes with slack adjusters NOTE A brake found at the adjustment limit is 1 Check the gauges in the cab to make sure not a violation that the air pressure in the tanks is 100 psi 7 i 689 kPa with the engine off and the spring Standard Stroke Clamp Type Brake chambers released Chamber Data 2 With the brakes not applied measure the m F distance from the bottom of the air chamber to
31. not have to replace O Plus LX500 and MX500 brake camshaft bushings and seals when you reline the brake prior to the recommended service interval 1 Periodically inspect brake shoe linings If the lining thickness is 0 25 inch 6 35 mm at the thinnest point reline the brakes Refer to Install Brake Shoes in Section 4 of this manual 2 Periodically inspect the brakes for correct clearance between the lining and drum If you must manually adjust the brakes because of excessive air chamber stroke correct the problem Refer to Adjust the Brake in Section 4 of this manual Brake Inspections After the Recommended Lubrication Interval At the first reline inspect the cam to bushing radial free play and axial end play Radial free play movement must be less than 0 020 inch 0 51 mm Figure 9 1 Figure 9 1 24 A MERITOR e If radial free play movement is less than 0 020 inch 0 51 mm Do not replace the bushings and seals e If radial free play movement exceeds 0 020 inch 0 51 mm Replace the bushings and seals e If axial end play exceeds 0 030 inch 0 76 mm Remove the snap ring Add the appropriate number of spacing washers between the automatic slack adjuster and the snap ring to achieve between 0 005 inch and 0 030 inch 0 127 0 762 mm axial free play movement A Section 9 MERITOR Inspection Visual Inspection 7 The return springs must retract the shoes completely when the brake
32. on tag from the camshaft bracket during the extended maintenance period You can identify O Plus LX500 and MX500 cam brakes by checking the identification tags affixed to the brake 1 A brake shoe tag identifies the brake as Q Plus 2 An additional identification tag imprinted with SEE MERITOR MAINTENANCE MANUAL MM 96173 FOR LUBE INFO which is affixed to the brake chamber bracket over the top of the plugged grease hole identifies the brake as a Q Plus LX500 or MX500 brake 3 Q Plus LX500 and MX500 brakes and Meritor automatic slack adjusters do not have grease fittings O Plus LX500 Cam Brakes The O Plus LX500 package consists of e 15 inch x 4 inch or 5 inch cam brakes on steer axle e 16 5 inch x 7 inch or 8 inch cam brakes on drive axle e 15 inch x 8 5 8 inch cam brakes on drive axle for 19 5 inch wheels Figure 1 1 Figure 1 1 16 5 Q PLUS LX500 BRAKE WITH STAMPED SPIDER A Section 1 MERITOR Introduction Q Plus MX500 Cam Brakes Q Plus LX500 and The O Plus MX500 package consists of MX500 Features e 15 inch x 5 inch cam brakes on steer axle with e LX500 and MX500 seals bushings and grease proprietary lining e 16 5 inch x 8 inch cam brakes on rear drive axle with proprietary lining e Plus LX500 components Comparing 15 Inch Q Plus LX500 and MX500 Brakes with the 15 Inch Q Series Brake Q Plus LX500 and MX500 15 inch cam brakes offer the following feat
33. rer e Use Meritor approved linings is too short replacement linings with excessive swell and or growth e Incorrect slack adjuster part number e Check with Warehouse Distributor or Original Equipment Manufacturer e Clevis installed at wrong angle e Use correct template to install clevis correctly e Loose jam nut at clevis e Tighten to specification e Spring brake does not retract fully e Repair or replace spring brake e Wrong manual adjustment e Adjust brake e Poor contact between linings and drum or e Repair or replace drums or linings drum is out of round e Brake temperature imbalance e Correct brake balance e Linings drag 22 MERITOR Section 8 Recommended Periodic Service Recommended Periodic Service A WARNING To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service AX caution Do not let brake lining wear to the point that the rivets or bolts touch the drum Damage to the drum will occur Adjustment e Adjust the brakes when the air chamber stroke exceeds the limits shown in the CVSA charts on page 26 Lubrication e Lubricate the brake and automatic slack adjuster according to the schedules on page 20 Reline e Reline the brake when lining thickness is 0 25 inch 6 3 mm at the thinnest point e Replace shoe springs check the drum and perform a major inspection Inspection e Refer to Section 9 of this manual Compl
34. ressure to prevent dust from becoming airborne Allow the solution to flow between the brake drum and the brake support or the brake rotor and caliper The wheel hub and brake assembly components should be thoroughly wetted to suppress dust before the brake shoes or brake pads are removed Wipe the brake parts clean with a cloth c If an enclosed vacuum system or brake washing equipment is not available carefully clean the brake parts in the open air Wet the parts with a solution applied with a pump spray bottle that creates a fine mist Use a solution containing water and if available a biodegradable non phosphate water based detergent The wheel hub and brake assembly components should be thoroughly wetted to suppress dust before the brake shoes or brake pads are removed Wipe the brake parts clean with a cloth d Wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA when grinding or machining brake linings In addition do such work in an area with a local exhaust ventilation system equipped with a HEPA filter e NEVER use compressed air by itself dry brushing or a vacuum not equipped with a HEPA filter when cleaning brake parts or assemblies NEVER use carcinogenic solvents flammable solvents or solvents that can damage brake components as wetting agents 4 Cleaning Work Areas Clean work areas with a vacuum equipped with a HEPA filter or by wet wiping NEVER use compressed air or dry sweeping to clean work areas
35. riod purges out of the pull pawl However you must continue to observe all other 5 Replace the grease fittings with grease plugs brake preventive maintenance schedules and Cover the bracket plug with a new procedures for both O Plus LX500 and MX500 identification tag cam brakes and Meritor automatic slack adjusters 6 After the first lubrication follow the manufacturer s chassis lubrication schedule Lubrication Intervals and your regular preventive maintenance schedule You should also continue to perform Q Plus LX500 Cam Brake periodic inspections of the brakes Refer to On Highway 3 years 500 000 miles Section 9 page 24 Linehaul 805 000 km All Other 1 year regardless of mileage Applications Q Plus MX500 Cam Brake On Highway 3 years 500 000 miles Linehaul 805 000 km Do Not Lubricate the LX500 and MX500 Brakes and Automatic Slack Adjusters Before Specified Time or Mileage Intervals e Do not remove the identification tag that covers the grease plug e Do not grease the brake assembly or the automatic slack adjuster prior to the specified lubrication interval times or mileages in the table on this page 20 A Section 6 MERITOR Lubrication O Plus LX500 and MX500 Greasing Approved Greases Service Intervals and Specifications Q Plus LX500 Cam Brake 0 617 A Multi Purpose Lithium On Highway 3 years 500 000 miles 0 617 B Chassis Grease Linabanl eee con KN 0 645 Mobilgrease 28 Milit
36. s are released For safe operating conditions and longer Replace the return springs each time the component life make these visual inspections brakes are relined The spring brakes must before the vehicle is put into service retract completely when they are released 1 Check the complete air system for worn hoses 8 Check the air chamber size and the slack and connectors With air pressure at 100 psi adjuster length of all wheel ends All drive axle 689 kPa brakes released and engine off loss wheel ends should have the same size air of tractor air pressure must not exceed two psi chamber and slack adjuster length Both steer a minute Total tractor and trailer loss must not axle wheel ends should have the same size air exceed three psi per minute chamber and slack adjuster length 2 Check air compressor performance Air system S j pressure must rise to approximately 100 psi Federal Roadside Inspection 689 kPa in two minutes 3 The governor must be checked and set to the Brake In Service specifications supplied by the vehicle Adjustment Inspection manufacturer NOTE Check brake adjustment with 80 90 psi 551 620 kPa air pressure in the brake chambers when the brakes are fully applied 100 psi 4 The tractor or truck air system must match the specifications supplied by the vehicle manutacturgi 689 kPa in the air tanks with the engine OFF 5 Both wheel ends of each axle must have the will supply 80 90 psi 551 620 kPa in the sa
37. sbestos fibers whose long term effects to health are unknown You must use caution when you handle both asbestos and non asbestos materials A WARNING Block the wheels to prevent the vehicle from moving Support the vehicle with safety stands Do not work under a vehicle supported only by jacks Jacks can slip and fall over Serious personal injury can result 1 The vehicle must be on a level surface 2 Put blocks under the wheels not being raised to keep the vehicle from moving 3 Raise the vehicle so that the area to be serviced is off the ground Support the vehicle with safety stands A WARNING When you work on a spring chamber carefully follow the service instructions of the chamber manufacturer Sudden release of a compressed spring can cause serious personal injury 4 Ifthe brake has spring chambers carefully cage and lock the spring so that the spring cannot actuate during disassembly 5 Fully release the slack adjusters so that the shoes retract and the drums clear the linings A CAUTION You must disengage a pull pawl or remove a conventional pawl before rotating the manual adjusting nut or you will damage the pawl teeth A damaged pawl will not allow the slack adjuster to automatically adjust brake clearance Replace damaged pawls before putting the vehicle in service 6 Use a screwdriver or equivalent tool to disengage the pawl assembly Figure 2 1 Figure 2 1 MANUAL ADJUSTING NUT 7
38. ther brake preventive maintenance schedules and procedures for O Plus LX500 and MX500 cam brakes with factory installed Meritor automatic slack adjusters Meritor s new O Plus LX500 cam brake package includes e Q Plus LX500 cam brakes e Meritor factory installed automatic slack adjusters with threaded or welded clevises Extended Lube Feature For on highway linehaul applications the Q Plus LX500 camshaft and slack adjusters do not require periodic lubrication for three years or 500 000 miles 805 000 km whichever comes first For all other vehicle applications the lubrication interval is one year regardless of mileage Q Plus MX500 Cam Brake with the Extended Maintenance Package Option Available for On Highway Linehaul Applications Only Meritor s new O Plus MX500 cam brake is available for on highway linehaul applications only and includes e Extended Maintenance Package Proprietary friction material on 5 inch shoes for steer axles and 8 inch shoes for drive axles for more wearable volume than LX500 O Plus brakes e Extended Lube Feature The O Plus MX500 camshaft and slack adjusters do not require periodic lubrication for three years or 500 000 miles 805 000 km whichever comes first e Meritor factory installed automatic slack adjusters with threaded or welded clevises A MERITOR Identifying Q Plus LX500 and MX500 Brakes NOTE Do not remove the identificati
39. through the template slot Figure 4 19 specifications in the table below Jam Nut Torque Specifications 1 2 20 20 30 Ib ft 27 41 Nem Figure 4 19 THREADED CLEVIS 5 8 18 35 50 Ib ft 48 68 Nem 17 Section 4 Assembly A MERITOR Adjust the Brake AX caution You must disengage a pull pawl or remove a conventional pawl before rotating the manual adjusting nut or you will damage the pawl teeth A damaged pawl will not allow the slack adjuster to automatically adjust brake clearance Replace damaged paws before putting the vehicle in service 1 Disengage the pawl Turn the adjusting nut until the linings touch the drum Turn the adjusting nut 1 2 turn in the opposite direction 2 Measure the distance from the center of the large clevis pin to the bottom of the air chamber Figure 4 21 Figure 4 21 Measure this distance brakes off brakes on THREADED WELDED CLEVIS CLEVIS 3 Use a pry bar to move the slack adjuster so that the linings are against the drum Measure the same distance again The difference between this measurement and the measurement in Step 2 is the free stroke 4 Turn the adjusting nut until free stroke is between 5 8 3 4 inch 15 9 19 1 mm 5 Check the adjustment Apply the brakes Hold the pressure at 85 psi 586 kPa Measure the distance from the center of the large clevis pin to the bottom of the air chamber 18 6 The difference between the meas
40. ts Serious personal injury can also occur Visit Our Web Site Videos Visit the Technical Library section of Meritor Cam Brake Maintenance www meritorauto com for additional product Video 90233 and service information on Meritor s Drivetrain Plus component lineup Automatic Slack Adjuster Installation and Maintenance Video 90234 Drivetrain Plus Technical New Generation Automatic Slack Adjuster e e Video T 9443V Electronic Library TEL on CD video The CD includes product and service How to Order information on Meritor s Drivetrain Plus component lineup 20 Order TP 9853 Call Meritor s Customer Service Center at 800 535 5560 Sa MERITOR Table of Contents A Asbestos and Non Asbestos Fibers Warnings 000000 Exploded Views cone fos soa coded eedadbiadtd exe hashes ans ENEE Section 1 Introduction Q Plus LX500 Cam Brake Package with the Extended Lube Feature 2 0005 O Plus MX500 Cam Brake with the Extended Maintenance Package Option Available for On Highway Linehaul Applications Only Identifying Q Plus LX500 and MX500 Brakes Q Plus LX500 Cam Brakes Q Pl s MX500 Gam Brakes 2 fies ten ee os ee dere ee ed Le Die a Comparing 15 Inch O Plus LX500 and MX500 Brakes with the 15 Inch O Series Brake O Plus LX500 and MX500 Features Specifications Section 2 Disassembly Remove Wheel Components Remove Brake Shoes eege Nee TREK u
41. urements in Step 2 and Step 5 is the adjusted chamber stroke The adjusted stroke MUST NOT be greater than the dimensions shown in the Commercial Vehicle Safety Alliance CVSA North American Out of Service Criteria Reference Charts in Section 9 7 Release the pawl assembly A WARNING When you work on a spring chamber carefully follow the service instructions of the chamber manufacturer Sudden release of a compressed spring can cause serious personal injury 8 If the brake has spring chambers carefully release the spring 9 Test the vehicle to make sure that the brake system operates correctly before you put the vehicle into service A Section 5 MERITOR Reline the Brakes Reline the Brakes AA WARNING To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service Asbestos and Non Asbestos A Fibers Warning Some brake linings contain asbestos fibers a cancer and lung disease hazard Some brake linings contain non asbestos fibers whose long term effects to health are unknown You must use caution when you handle both asbestos and non asbestos materials Vehicle brake systems require the correct lining material to perform as originally designed The type of lining material that is specified is based on several technical considerations and DOT braking performance regulations Always use the lining material specified by the vehicle manufacturer Always reline
42. ures not available on the S 15 inch O series brake e Double web shoe s e Cast spider e 1 5 inch 28 spline camshaft e 1 75 inch offset e 0 75 inch tapered block lining Specifications NOTE Specific applications require approval from Merito along with precision machined components keep water and contaminants out and lubrication in the assembly A larger heat treated cam head journal diameter reduces bearing stress to increase cam and bushing life A new coated steel backed bushing at cam head e The MX500 package includes wider shoes with proprietary friction material for more wearable lining volume New fiber blended spline end bushing improves wear resistance Optional An integrated brake spider is available on the Easy Steer Plus front axle r brake engineering For complete technical information spec ing assistance or original equipment manufacturer OEM replacement parts contact Meritor s Customer Service Center at 800 535 5560 or your Meritor representative GAWR Range Diameter X Width Gross Axle Weight Rating Drive Axle 19 5 Wheels Section 2 Disassembly A MERITOR Remove Wheel Components AX wanne To prevent serious eye injury always wear safe eye protection when you perform vehicle maintenance or service Asbestos and Non Asbestos A Fibers Warning Some brake linings contain asbestos fibers a cancer and lung disease hazard Some brake linings contain non a
43. y installed automatic slack adjusters on Meritor s O Plus LX500 and MX500 cam brakes Damage to components can result 1 Use soap and water to clean non metal parts 2 Use soft paper or cloth that is free from dirt oil or abrasives to dry the parts completely Dry Parts After Cleaning Dry the parts immediately after cleaning Dry parts with clean paper or rags or compressed air Corrosion Protection NOTE Parts must be clean and dry before you lubricate them 1 If you assemble parts immediately after you clean them Lubricate parts with grease to prevent corrosion Parts must be clean and dry before you lubricate them If you store parts after you clean them Apply a corrosion preventive material Store parts in a special paper or other material that prevents corrosion Inspect Parts It is important to carefully inspect all parts before assembly Check all parts for wear or damage Repair or replace them as required 1 Check the spider for expanded anchor pin holes and for cracks Replace damaged spiders and anchor pin bushings 2 Check the camshaft bracket for broken welds cracks and correct alignment Replace damaged brackets 3 Check anchor pins for corrosion and wear Replace damaged anchor pins 4 Check brake shoes for rust expanded rivet holes broken welds and correct alignment Replace a shoe with any of the above conditions On 16 5 inch brake shoes only Anchor pin holes must not exc
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