SERVICE MANUALAnchor PinsThe anchors should be inspected for signs of wear. Inmost cases, rust will be the factor in servicing brakeanchors. Clean all dirt and rust from anchors and coatthem with a very light coat of lubricant. Refer toLUBRICATION, section, Brakes, for type of lubricant.If anchor pins are worn, they must be replaced. Anchorpins may be replaced on all brake groups except Eaton(Fig. 18). Eaton anchor pins are staked in place and arereplaced with spider.Brake Shoe Return SpringsInspect brake shoe return springs for distortion, such asnicks, twisted shanks or spread coils. Damaged springsmust be replaced. It is suggested that shoe returnsprings be replaced when shoes or shoe lining arereplaced.Backing Plate end Dust ShieldsInspect backing plates and dust shields. If bent ortwisted, they must be replaced.SpiderInspect spider for damage. If any cracks are found, thespider must be replaced.Camshaft Bushings and RollersClean all dirt and rust from rollers and camshaft. In mostcases, rust will be the factor in servicing rollers. Checkfor dirt in splines on camshaft. Remove any small burrsfrom camshaft assembly to avoid damage to seals whenshaft is reinstalled.Inspect camshaft, camshaft bushings or bearings andbrake shoe rollers. If noticeable signs of wear exist,replace worn parts.Do not remove camshaft bushings from spider and/ormounting bracket unless replacement is necessary.Apply a very light coat of lubricant to camshaft assemblyand rollers. Refer to LUBRICATION section for type oflubricant.For detailed servicing instructions pertaining to camshaftand bushings, refer to SERVICING BRAKE GROUPCOMPONENTS in this section.REASSEMBLYThe reassembly instructions contained herein have beenarranged as follows:Install Wheel, Hub and DrumBrake Groups with Backing PlateBrake Groups with SpidersInstall Wheel, Hub and DrumAfter various components of the brake assemblies havebeen serviced, brakes are reassembled by reversing thedisassembly procedure.It is recommended that newly installed brake lining becircle ground before installing brake drums. Circlegrinding lining to fit drum assures full contact betweenlining and drum. Refer to RECONDITIONING BRAKEDRLUS AND SHOES section.When reassembling various components which aresecured with bolts and/or nuts such as backing plates,spiders, camshaft brackets or anchor pins, refer toapplicable ’ORQUE CHART.Brake shoes must be properly located to providedesigned efficiency of brake group. The primary(forward) shoe is the first shoe just past the cam inforward direction of wheel rotation.Brake shoes with combination brake blocks sets of semi-metallic and organic lining must be installed as shown inFigures 19 and 20.The brake blocks on each shoe consist of one semi-metallic material (shaded area) and one block of organicmaterial (unshaded area).The semi-metallic material is identified by the metalparticles embedded in the brake block. The organicmaterial will not have the visable metal particles.Brake Groups with Backing PlateRockwell “T” Series Brake GroupThe Rockwell “T” Series brake group will bereassembled in the same manner as the WagnerCTS-4080W - Page 12
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