Gunite Brake Drums - Accuride Corporation
Contents
1. entering the systern Brake drums should also be checked Tor evidenca of scaring F the blog surface diameter is in ecess of masimum allowable tolerances the brake dum MUST be replaced Worn Mounting Surface Rounding over of drum mounting surface caused by continued operation wth 3 wm loose whee assembly this conto lt uncorecsd t cause the wheel bolis to beak rending whet end fire and the loss of tne whee assem To heck forth don use a erat edge and a fear Gage as shown V to wear exceeds 0307 he drum must be replaced along wih al hee bots in the assembly When checang brake drum diameter or woar the diameter shoud exceed 01207 over the diameter When boring bake drums shed shoud not exceed 0080 over the orgiat diameter Out OFRound Drums This condition exists when the drum diameter shows variations at diferent points around the suface andthe brake ings mare wear on one side than the other Ths distortion af the drum as a esl of excessive heat generated dung brake applications or az a result of improper drum storage techniques proper drum storage recommendations page of ths manual Oher possble causas this condon include improper chucidng the rm duning turning or iced be te esl of dropping the dram on a hard sce Aing routne whesi end maintenance ameter ofthe drums bong surface within allowable2. and len the braking surface of the drum When ttus problem occus tne braking system Should be checked lor ae or more ofthe following The brakang system shouldbe checked fo balance o make sure that brakes are funclomng equally the brake application Check the slack austere to make certain that they are functioning properly and tnat the proper clearances present Between the lning and tne bang sufac Individual brakes shouldbe checked for warn or damaged brake Unngs or other broken or damaged Brake drums should be checked for excessive wear or specie damage to tha rang surface Drums Should alsa be checked tor the presence of abrasivos foreign matter in the drum The brake drums should be removed and checked forthe exstence of one or mare ofthe problems describes The sppepnata corrective action shoul be taken immediately depending on the problem found to be the cause ACCURIDE WHEEL END SOLUTIONS AWES LIMITED WARRANTY TO FILE A WARRANTY CLAIM CALL 1 800 869 2275 ext 1 Aecude Wheel End Solutions AWES warrants to the original purchaser that its products are from defects in material and workmanship The ined warranty elerence ble below 1s based on dll product manufacture and shali be ved the produci 1s altre modd misapplied missed neglected or nat maintained in accordance with the instructions printed inthe product specific Accride Wheel End Solutions Saf
3. net the drum can be machined to restore concent I the drum damela is past the recommended imitations the rum MUST be replaced When checking brake drum diameter for wear the diameter should rot exceed 10120 over the onginat amet When brake dns the finshed shouid nat exceed 00807 over the ongal diameter PECURIDE Oversized Worn Drums Tha condo is indicated by ether excessive wear at the Lp outer edge ofthe drum or proper urang ta contact rng brake To check use a drum gage as shown to measure the ameter otha drum at least d bran When checking bala crum dametar fr ace the measurements exc wear the ameter should not exceed the allwabl tations see note the 10 120 over the diameter When take drum can be machines to restore Tebaring brake drums the finished Gancentiohy the dum dameter ispast diameter should not exceed 0080 over the recommended imitations the orignal diameter MUST be replaced and new shouid be stalled Improper Application Of Brake Drum This condo can be deified by val inspecting he Brake assembly far evidence of the lining protruding past the outer edge ofthe brag surface as hown al tes condition ex check the hub application speciicabons to determine the proper for the application and replace drum and install new the oid
4. Number size and location of bolt there slats in the back of the holes irum for wheel spoke clearance Factory Balanced Brake Drums Gunite makes two types of factory blancs brake drums machined balance and welded balance wes Both styles are balanced othe some factory specications inch ounces ront and 20 inch ounces raar drive and Valer a and wi pranda ert peormance When orden replacement crums or stalling new dung norme brake service ti acceptable to interchange machined balance wih vadibonat welded balance drums Welded balance weight Proper Storage of Brake Drums Machined to Balance Many ees maintain an inventory of rums for routine replacement The proper storage and handing af hec drums wil nre optimum performance and longer service Le Correct Storage Method ums hou be sored nan area excess moisture and Sacked as shown in Pit ensure proper of weight fon the sidewalls of the drum Propert new drums wil vod distin of the sidewall or damage to the braking surface Figure 1 Incorrect Storage Methods Storing brake drums by nestng one drum in another without designed stackang feature or resting the rms on ther book end as shown in Figure 2 wit resultin damage ta the drums Storing drums any of these ways wil cause an out of ound to occur whuch require
5. replacement drum surface and that t s installed property Brake compatible ics oi tremely important in that each braka on the vehicle must Da e ita ee ote renee Information wile requred in order to determine the proper bralke dram for your vehicle Proper Matching of Brake Assemblies Will Name of the vehicle manufacturer Maximize your brakes stoping performance Model ofthe vehicle Provide longer service between overhauls Manufacture and mode numberof the ale Minimize brake maintenance costs Manufacture and modet number of the associated wheel and hub Proper Brake Drum Selection is Key to Maintaining 5 a y scuaton Optimum Brake System Performance Scam Wedge or Hydraulic When specifying replacement brake drums the folowing Both ends of a common ade MUST be in the same state of information wil be reque repair I the brake shoes end are replaced te shoes on othe desided ie the other end should also replaced one drum on an axe Teens is tume or replaced the other drum shoud also be tumed The manufacturers part number replaced to maintain consistent rang performance ibo information rovousy described is not avaiable wil be necessary to take accurate massirements and pather the formation described in steps trough 7 Braking surface diameter Overall depth of the drum Pilot diameter Bolt circle
6. are damaged can be identified by the presence of fractures ar cracks around the bolt cirie mounting surface of the dium The condilion i caused by interference between the bb and dum mounting surface due to improper sealing of the rum on the hub lot dung or by nealing drum wih a mounting eng diameter smaller than the hub piot ameter tes conto reset the drum MUST be replaced Check the application specications to determine the proper cum fr the aplication before alempi to instal a replacement dum Ths condo is caused by interference between the hub and drum mounting surface dung installa as a result af using the wrang drum for the application or propor cleaning the hub poting surface pno to drum installation Its conditon exis the drum MUST be replaced Checicthe application specifications to determine the proper drum forthe application before attempting to metal replacement dnan Before attempting to re install another brake drum visually inspect the hub plating surface and make sure that drt and corrosion are propery removed Aso tke care when installing the drum to mae sure that the drum mounting surface is proper and even Saated agast the hub mounting surface before Lrqung the whee nuts dut reascembly I E When replacing a worn out or damaged drum cotain procedues A description of other markings appearing on he outar should be flowed to ensure that you choose the
7. machining to restore before allio Tus wil grant reduce the of the drum and creste unnecessary expense othe machining of new drum Figure 2 I GUNITE Installing New Brake Drums When instaling new bake drums is advisable to check all components of the brake system for wear and tharoughiy claan them poc t inta the new drum The brake system shouid also be checked for proper adjustment and balance ta ensure proper operation Hub Piloted vs Ball Seat Drums Kis important to make sure thatthe corect hub and dum combination used when replacing whesl end assemblies Incorrect mismatched parts resultin lose or broken mounting studs wheetends which can resultin an accidet If uou are unsure about tha correct combination for your aplication contact the manufacturer or ha corect part numbers and Older ball seat mountings have a close Rt between the drum stud holas and stud ameter The dum on th hub pilot The Wheels are piloted on the studs using inner and outar cap nuts ee Fares Hub pice mountings have a close f between the drum plot and he machined plot continuous interrupted on ne hub The drum bolt mounting holes are larger than the stud dame The wheels and dum are poled onthe hub Gee Figure 4 New drum designs wi alow you to use the samo dum fr ball seat and hub pleted when matched with the proper hb The
8. on te rear dove anle and tallar avles 1 some applications where studs are used a clearance may ext between the bolt hole diameter and the stud This contin is nat problem because the drum wil be centered by the hub pilt and wil be held in piace when the whee torqued against the dm When the proper mounting hardware used and the recommended whee torque see chart on not page are maintained the drum wil be eld securely in piace 14 4 Bolt Hole Front Steer Axle Application 7 Bolt Hole Rear Drive and Trailer Axle Application M 22mm Wheel Bot 3 Whee Disc Wheel Mounting Torque pled win tera zAgiutodeps of SAE OW atto the pont been he nut and e fonge ardore SAE SOW o xor std Never ubica wheel bal saals ar mounting faces I Lubrication is desired must be used sparingly oni on the reads af he studs andor nuts 1s used cons the wheel manufacturer or toque recommendations I GUNITE Trouble Shooting Driver Complaints some instances divers may complain of braking wregularties between narmal routine brake system inspections The folowing istis af some ofthe more common driver complaints he cause and the action requred to solve the prablem Should der complaints ase itis advisable to inspect the braking system at Ihe ares possibla me Vibration during harmat operation ofthe vehicle
9. Driver complains of excessive fae Braking power diminished or completely tst during bake pplication Diver complains ot brakes puting ding pplication causing swerving tothe ator sigh Dover complains sf excessive or pulsating during brake prr Ths problem may be caused by any one of or a combination ot the following problems Suspension ehee base cab mounting out ol round tes and er wheels tre wheel brake ar hub Improper mounting of hub piloted ru Worn mounting suce the drum as a result of loose wheel Any brake wil eventualy fade when subjected temperatures such as Instances of repeated ck tps rom high speeds or during log periods Sl down braking Tus problem can be caused by infor linings which may sutter some chemical breakdown under pans of high temperature gh qal Brake uning wi fade gradually allowing the ver tine to creese baking pressure and maintain contol of the vehicle Excessive fade can also be caused by drums which expand to tne point of maximum shoe travel dung Extended penods ot excessive heat This reduction oF ontact between Uning and bralang suface results in loss of bratang power Puling to the Lett or night during bake application Tan Be caused by ether unequal Braking loce nbalanced Braking system or improper functioning brake components These pr
10. Gunite Brake Drums Maintenance and Installation Manual Made in the USA Your only single source for industry leading wheel end solutions STEEL ALUMINUM WHEELS DRUMS HUBS ROTORS SLACK ADJUSTERS L 5 GUNITE Since 1923 Guns has been designing and manufacturing brake drums for the heavy duty commercial vehicle industry Today Gunite Continues to be th standard wth brake drums as standard equpment with more OEMs tan ang other brake drum manufacture In order to the of your Gunite brake drums proper installation periodic inspection and maintenance procedures must be falawed The information contaned in this manual wil hel in establishing a brake drum maintenance program that wil help you spot probleme and take the necessary correc measures to restore balanced braking and ensure safe ale brake system performance When and How to Inspect Brake Drums relable brake system performance i dependent sound brake system maintenance program Ris important hat regularly scheduled inspections af the bake system are incorporated into your preventabve maintenance progam incorporating a regular brake inspection program your cos per mile wil be signifeartiy reduced Costly downtime can be reduced by spting problems beoe they take a af serves for extended penods of trme Whe there speci recommended timetable for brake system inspection we recommend that y
11. e system should be checked far proper balance The ratum springs shouldbe checked to determine hey are weak or broken The brake shouid be checked proper adjustment and clearance W tis condition is lef unresolved t can result in the development of a martenste condition or eause the dram o croci Polished Drums A polished drum can be ideni by the mirorke fresh on the bralang surface This prablem can easly be solved by sanding the braking sace with 80 grit emery ciath It also necessary to remove he glaze from the tring at the same me using the rt men ctn The bola system should be checked for itg dragging brakes The ings should aco be checked to make sure that they have the corect icon ang lisa recommended procedure to sand the braking ofthe drum at the time ot reining Excessive Wear excessive wear occurs along the edes of the brung contact area of the rang sace or in areas concidng wth the bring rivet holas the systern should be checked to make sure ihat there not an abnormal bulup oF abrasive mater The most common cause of this probier is the bap o abrasve material rom either ha presence or absence of dust shields depending on the application ofthe veil the problem occurs while dust shields are installed remove the lower dust held t allow abrasive matenals to more ready ert the bleng sustem occurs when dust svelas are not employed install dust shields to restrict abrasive
12. els ch sons pee cub ares ua te chang or iter Far ere Funge Jece Suid Acc Flange Acc whe AMES conned casing wb id Set sod Sota Fehr Po eia ES emery ha te ele ph 9 rae Drm Spake Wheels Due Whee Huba Ado Sack Asta and Hardware The dove wy sal be vd 0 Si tev AES bore ee sce la sce arm of we peas Siar to cara malt ri Da podc fle a ea of waar maces pos The TRU SET doc wheel eges nua d s aint approva cag and ubican REMEDIES AND LIMITATIONS OF REMEDIES nin eve of any meri brach of the aboe mid cans AES gest our rae a tssole without chage surda s warble poc Dal fat dnm narmal anderen due t n tea andi woh ael to le pesa tien ref the teg reac wih 30 fai Tere s fe essence dong chur fata to roe win res AVES e equ me ot beach a e regang wean aa AES etn aby hal tea ot In el wl AMES labi en tacos Seed pod oes in wey relay n ram oer ess ud Tema ctor teen shal be and ce cs lek to the purchaser so tat ANES ep or placeren o AMES titan AVES SHALL NOT LABLE FOR ANY CONSEOUENTIAL OR NODENTAL DAMAGES OF ANY KOND FURTHER UNDER NO CRCUMSTANCE SHALL ANES BE LABLE FOR DAMAGES BEYOND THE PRICE THe GOODS PURCHASED SY THE ORIGNAL PURCHASER WHETHER IN CONTRACT N TORT OR UNDER ANY WARRANTY OR AMES reser
13. ety amp Service Manual GENERAL PRODUCT OVERVIEW Syn 500 000 miar Sw 350000 300 000 m t omi 2 L I GUNITE ACCURIDE WHEEL END SOLUTIONS AWES LIMITED WARRANTY TO FILE A WARRANTY CLAIM CALL 1 800 869 2275 ext 1 ADDITIONAL PRODUCT SPECIFIC LIMITED WARRANTY CRITERIA eae The stow ant sabe edhe profiel ied with paper e o aon pears ced lona as The sows produet ol propetymantanedin acre vt he Aun Say amp Service st The stove wart o dot nl ovt eet renting rom coun rape tle dew br nw Acie componen Sen teed a te taro ieri persa condom ACCU ARMOR aod ACCU SHELD AWES dos not coe allen Any dumage n the aes of the mounting such ae nde mounting nots De aes wi bso dams ete onal wh thr whet 2 ia pn i Any damon en dee cid dune rm he e d bev abv role wet carp pa aug dence and fog damage te bei du trea steppin bate by wed diac charter cba bane rire ACCU SHIELD pedcs entered corte AVES commands ACCU FLANGE The Acc unge snes waa cover purchaser apt hap don ten Rage rt ger fromthe dato mananctr Th waranty dos nl cov Flow onions ome esi ncn dene Bram ths f sates traverser e scouring pad veg cher caes nd 0 Ay mage femora cpp ww b cole s
14. into cracks in he braking surface depending such factors as Bring wear rate brake system balance and how hard the brakes are used Normal hel checking des ot impair baling performance however s advisable to make sure that deep cracks have not developed Replace the brake drum i of the owing condone are ound hest checks where one or more extend completely ares te brake surface or deep cracks are present PECURIDE Grease Stained Drums this condition wes the brake drum wil show discolored spots on the bang surface wit and or grease spattered on the brake assembly This condition 1s most Ue eed bya faulty system or improper greasing of the brake cams To correct the probem the source of the grease and or must be located and necessary repairs made fa minat tne leak Remove the entire brake assembly and clean each Component thoroughly Nth rings are soaked wih or grease they must be replaced Martensite Spotted Drums This problem may te ndcatd by hard igi rased dark colored spots the surface wih uneven wear This problem may also be indicated by pulsating nde upon brake application or excessive upon baking This condition indicates that the drum has been subjected to extremely high lempertres caused by an improperly balanced braking system a dragging bake or contu severe applications These extremely high temperaturas have caused structural changes to cr in
15. oblems can be caused by one or more ofthe folowing problems The existence bung martensite condition or ease spotted polished rums excessive wer at the holes and or tthe point where the edge of the Unings contact the bralang surface Other causes ould nelude out of round druma unbalanced drums worn or damaged brake parts or foreign onthe braking surface tis determined that the problem results Kom an unbalanced brake drum or whet the component can be balanced in tne fed ora ew replacement part may be ordered tne factory prevalence the exter f the drum is covered with rust scale Gut tar or ther foren maleral remove with Wes brush and clean with kerosene Then wipe and Thoroughly dry the dum before entation the drum has been improperly mounted on the hub piat remove and check the hub and drum fer mage Reinstall tne drum prope When excessive fading occurs he system pe checked for one or more of te following problems Check the brakeng system to ensure that the entire system properly balanced and that all brakes are functioning proper Check the rake drums or the existence of martensite blung drum distro or an ota ound drum Other causes may include oversized rums wor enpropery rated ings Check the drums fo grease stains If grease stains clean the entire assembly repar the broken or faulty component causing the leak replace the Uning
16. ou establish a regular and thorough inspection procedure to ensure consistent el bake performance Follomng are some of the more common problems encountered during regular brake drum inspection and the recommended procedures far correchng problem Cracked Drums Upon inspecting the drum a crack extending tough the entre wall fund This condition fe caueed by excessive heating and cooling fne brake drum operation this condition found the drum MUST be replaced mediata Repeated cracking of brake drums may indicate that tbe braka system and or the brake are inadequate for the particuiar application condition may als indicate daver abuse particulary the drums nig and brake systern are correct rated for the vale andthe application his problem occurs the brake system shouid be checked for proper brake system balance and proper brake Ung ratings as recommended by the OEM IF problem occu new drum cause may be from mshanding Heat Checking Heat checking is the appearance af numerous short fine hairine cracks on the braking surface ci the drum Haa checkng a condition found brake drums and s caused by constant nesting and cooling of braking surface which occurs asthe rakes are opted during normal operation of the vec Heal checks wil requnty wear away and reform as a result of the normal braking process however aat checks can progress over tme
17. point X in Figure S and a drum smaller chofer ook Y in Figure 5 installed wibout removing the corrosion rom te hu Ba drum wil not set propery and the mounting ange may break when the assembly is torqued Therefore fis necessary that you thoroughly clean the ub mounting surface using a scrapper and wire brush before tmp to meurt new take drum s especialy important If you are mounting brake drums a wheeend assembiy using an aluminum Figure 5 A Hub Pilot Chamfer Special Considerations for Mounting Brake Drums on Aluminum Hubs Unike ational cast ron hubs the sace on the pilot ofan aluminum hub is suscepi to damage if the is not propery saated dunng be mstalabon process F the drum s improperly installed and allowed to rest on whee piat the dum pol sace wil damaged when the assembly torqued down This wl not sw the drm to properly seat resulting in damage to the hub and may also Tesut in a drogang brake condton See ques 6 and below Figure 6 Improper instalation Figure 7 Proper instalation drum ram and not proper is correctly positioned on the dum Seated on the drum pilot of the hub pilot and Hat against the hub flan Disc Wheel Mounting Gunite has standardized the drum mounting bolt hole sizes on outboard mounted drums The bolt hole size on drums mounted the kont sebo 1s 1 4 The bolt hola size on drums mounted
18. se drums cannot be used with older hubs which have 2 diferent pot cametec Matching the drums wth the proper hub is rica m providing and the support of the wheel end Figure 3 A ball seat disc whe mount 5 Figure 4 A hub piloted disc wheel mount Before installing dum make sure thatthe bles are in the fly released poston ta provide enough clearance over the brake shoes Postion the hub pls be in the 12 otek location as Shown Note is vary important to make sure thatthe pls are clean and fee trom rust or any other foreign maleria Intl drum over the wheel bls and onto hubs drum pilot insuring that t Rush against the hub Range Care must takan to avoid damagog the wheel bolt treads when mounting dum Proceed with mounting whees making sure to follow proper wheal nut torque sequence and torque specifications per Safely and Sevice Manual Wa 000 Do not forget to propery adjust the brakes PECURIDE inal assembly visually inspect drum mounting and very are no gaps between the hubs drum piot and drum Check for any unusual gap diferences bebween braka ring and drums brake I GUNITE Mounting Gunite Brake Drums on Hub Piloted Wheel end Assembly unt drums are designed with diferent plot chamers where the drum ts the piat If corrosion buts up bhi he charter
19. the drum malenal which makes he rum more susceptible to W tis condition exists the drum must be replaced The brake linings should be checked for Uneven wear and replaced if necessary Ater replacing the brake drum the ene raking sytem shouid checked for proper balance between the tractor andthe trailer as well as wheel to wheel air distrbution brake adjustment and power A L aca Scored Drums This problem is indicated by a defined grooved appearance on the braking suface ofthe drum and encase bring wear Ithe severe and the drum is within the recommended inside diameter tation nate below the drum coul be machined to remove the scoring After reinstalling the brake components it is advisable to check the brake syster to delere there is excessive cf abrasive materal entering and bulang up on the rang surface ofthe drum wen checking brake drum diameter for wear the diameter should not exceed 0 120 ver the When reborn brake drums the finshed ameter should no exceed 00807 over the diameter Drums Adrum which shows the signs of blung has been subjected to extremely high temperatures This conditon may be caused by continued hard stops by brake system imbalance or irmpraperty functioning reum springs Ius not necessary to resurface or replace the dm as long as t remains within the sable tolerance for opereton To correct this problem the brak
20. ves te nht to est prohi um as conan t renbusement expense may be pait by AMES or maybe etme beorgel purchase trt faund ta te wate gand robo eue D AWES witout me Conde Adtran A Y ANES ademas hoan fe pns or to wartet AES tones De cae be purchaser to e emen la porn cons and pese mured oam ees and nanding suo god of amat cone may wsh toro tango eed ta Yes ed waa bach eel mod bo 30 ca o ot ware stus Pe prc deemed cara s be pop he ons purchaser and can be to the nga purchaser upon ns equest seco and espanse ron watt tem oot De elated ANES wi De conr B dap star pth reson pas ben node Fara waranty qst seco ARES antler BOO 86D 277 Ogbon Vorst questas or Clas o werat oanien co Acro dm fom ca TS 95480775 PURPOSE AL OF WHICH ARE EXPRESSLY DECLAIMED BY AWES IN NO EVENT SHALL THS WARRANTY DEEMED TO INCIDENTAL SPECIAL INORECT DR CONSEQUENTIAL DAMAGES OF ANY KIND 8 WHEEL END SOLUTIONS Your only single source for indutry eading wheel end solutions STEEL ALUNINUM WHEELS DRUMS HUBS ROTORS SLACK ADJUSTERS 00 677 3788 815 964 3301 secwridewheetendsluions com unte 302 Peoples Avenue Rockiord IL 6104 7082
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