Mounting Face: NEMA 182TC 184TC, 213TC, 215TC, 254TC .

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Series 87,700 (1-087-7XX)Mounting Face: NEMA 182TC 184TC,213TC, 215TC, 254TC, 254UC, 256TC and256UC Double C-Face Coupler8.5” AK, 7.25” AJStatic Torque: 6 through 105 lb-ftNote: 87,700 Series mounts between C-Facemotor and reducer. Do not apply overhungload to brake output shaft.Enclosure Material:Aluminum Housing, Cast Iron EndplateModification required for vertical above mounting.For vertical below, modification required on50-105 lb-ft. See SAB Modifications for list priceadders.Release Type: Side Lever, Maintained withautomatic resetEnclosure Protection: IP 23, 54 & 55 (formerlyreferred to by Stearns as NEMA 2, 4 & 4X BISSCCertified, respectively). ABS Type Approval Certified Spring-Set Electrically ReleasedInstallation and Service Instructions:P/N 8-078-927-27 Rev. B & C Self-Adjusting DesignParts List: P/N 8-078-917-57 Rev. BP/N 8-078-917-67 Rev. C Maximum Speed: Horizontal 4000 rpmVertical 3600 rpmModifications: Pages 51-60 Certified: CSA File LR-6254(4) mounting holes equally spacedon a 7.25” (184.15) B.C.Use 1/2-13 x 1.25” mounting bolts.* For X and U dimensions, see Ordering Information and Identification Information. ** Hub location.Dimensions for estimating only. For installation purposes request certified prints.Dimensional Data/Unit Pricing (Discount Symbol E2)NominalStaticTorque (102)105(142)Dimensions in Inches(Dimensions in Millimeters)Basic Model Number and List Price*ACAC ListPrice*DCDC ListPrice*IP 231-087-711-0X 2,375.00 1-087-715-0X 2,945.00IP 541-087-712-0X2,925.001-087-716-0X3,495.00IP 551-087-712-BX3,180.001-087-716-BX3,750.00IP 231-087-721-0X2,375.001-087-725-0X2,945.00IP 541-087-722-0X2,975.001-087-726-0X3,545.00IP 551-087-722-BX3,230.001-087-726-BX3,800.00IP 231-087-731-0X2,450.001-087-735-0X3,020.00IP 541-087-732-0X3,050.001-087-736-0X3,620.00IP 551-087-732-BX3,305.001-087-736-BX3,875.00IP 231-087-741-0X2,600.001-087-745-0X3,170.00IP 541-087-742-0X3,200.001-087-746-0X3,970.00IP 551-087-742-BX3,455.001-087-746-BX4,025.00IP 231-087-751-0X2,750.001-087-755-0X3,320.00IP 541-087-752-0X3,350.001-087-756-0X3,920.00IP 551-087-752-BX3,605.001-087-756-BX6,875.00IP 231-087-761-0X2,795.001-087-765-0X3,365.00IP 541-087-762-0X3,395.001-087-766-0X3,965.00IP 551-087-762-BX3,650.001-087-766-BX4,220.00IP 231-087-781-0X3,100.001-087-785-0X3,670.00IP 541-087-782-0X3,500.001-087-786-0X4,070.00IP 551-087-782-BX3,755.001-087-786-BX4,325.00* X in 9th digit designates hub bore and shaft size.Wt. (25.40)3.81(96.84)80(36.0)43

Series 87,700 Specifications continuedSpecificationsNominalStatic Torque No. lenoid Cycle Rate 1 Capacity 249)17.5820(249)BACK TO PAGE 1Brake set and release times in milliseconds,when brake and motor are switched separately(for T1/T2 definitions, see page 98):Inertia (Wk2)lb-ft2(kgm2 x 108(45.36).108(45.36).145(60.90)Static TorqueCoil SizeT1T210, 15, 25, 505&6422035, 75, 105848201 Maximum solenoid cycle rate is based on ambient temperature of 72 F (22 C) with50% duty cycle. Does not relate to brake cycle rate (see Thermal Capacity).2 Thermal capacity rating is based on ambient temperature of 72 F (22 C), stop timeof one second or less, with no heat absorbed from motor. Derate thermal capacity by25% for vertical mounting. Refer to Selection Procedure Section.Current Ratings (amperes)CoilACSize CurrentVoltage: 60 HzVoltage: DCVoltage: 50 ng and Identification InformationThe following example and tables provide information for selecting the appropriate three-letter suffix when ordering a Stearns Brake.Example of a complete part number:1-087-732- 01-–FGLead wire position (external, left and right)230 VacDoes not applyHub bore and output shaft size 1.125Standard AC VoltageRatingsHub Bore, Shaft and Keyway Sizes9th Digitof ModelNumber13Dimensions in Inches(Dimensions in Millimeters)Bore Dia.(X)Keyway*Keyway*ShaftLength (AH)1.1251.126.25 x .121.1251.124.25 x .122.62(28.57528.600)(6.35 x 3.18)(28.57528.550)(6.35 x 3.18)(66.68)1.3751.376.31 x .161.3751.374.31 x .163.12(34.92534.950)(7.94 x 3.97)(34.90534.950)(7.94 x 3.97)(79.38).38 x .191.6251.6241.6251.6265Character VoltageShaft Dia.(U)(41.27541.300)(9.52 x 4.76)(41.27541.250)For sizes other than those shown, contact factory.No motor frame adapters or foot mounting kit available.*Keyseats made to ANSI B17.1 standard.38 x .193.75(9.52 x 00/40060Modifications are available- see SAB Modification SectionDirect CurrentConsult factory if otherDC voltage is needed

SELECTION - Solenoid Actuated BrakesBACK TO PRODUCT OVERVIEWNOTE: For overhauling/high inertia loads, to stop in a specified time/distance, or for brakes combined with variable frequencydrives, please refer to Application Engineering Section.Table 1 – Torque SelectionStearns Solenoid Actuated Brakes can beeasily selected from Table 1 and 2.Given motor data:1. Horsepower (hp)2. Speed (RPM)3. NEMA C-face frame sizeDetermine:1. Static torque rating of the brake (lb-ft)2. Brake seriesStep 1 – Given the motor horsepower andspeed, select the brake torque from Table 1.Torque in table 1 is calculated using formula:In this table, brake torque ratings are no less than 140% of the motor full load torque.Brakemotor Shaft Speed (RPM)Motorhp70090012001500180036003000Static Torque Rating of Brake (lb-ft)Ts 5,252 x P x SFNWhere, Ts Static torque, lb-ftP Motor horsepower, hpN Motor full load speed, rpmSF Service Factor5,252 e: Given a 5 hp, 1800 RPM motor, theselected brake is 20 or 25 51.53610101520 or ******75105********Step 2 – Given the NEMA C-face motor framesize, select the brake series from Table 2.Example: Given the 5 hp, 1800 RPM motor in *See catalog pages for maximum rpm by series. Thermal capacity must be considered in loadStep 1 with a NEMA 184TC frame, Seriesstops over 1800 rpm.87,000; 87,300 or 87,700 Brakes can beselected to mount directly to the motor.Table 2 – Brake Series Selection by NEMA Frame SizeC-Face Motor Frame C504UC504SC505C505SCManually-Adjusted Brakes (require periodic adjustment to compensate for friction disc f-Adjusting Brakes (automatically compensate for friction disc 1Division I Hazardous Location Brakes (for atmospheres containing explosive gases or ignitable dusts) / Motor 1221222212121Division l Hazardous Location Brakes (for atmospheres containing explosive gases or ignitable dusts) / Foot Mounted10-105125-330487,30082,30044444222Division 2 Hazardous Location Brakes1.5-256-10556,80087,80013132121212Double C-Face Brake Couplers (for direct coupling a C-face motor to a C-face gear reducer)1.5-2510-1051234856,70087,70011111Brake mounts directly to motor C-face.Adapter required to mount brake to motor C-face. Refer to brake specifications for adapter information.Brake endplate modified for direct mounting to motor C-face without an adapter.Brake is foot mounted for coupling to a hazardous-location motor.2

BACK TO PRODUCT PAGE Spring-Set Disc BrakesP/N 8-078-927-27effective 8/12/04Installation and Service Instructions for87,700 Series Double C-Face Coupler Brake Rev. B, C & DRev: BSplined ConfigurationsRev. C & DFigure 1ImportantPlease read these instructions carefully beforeinstalling, operating, or servicing your Stearnsbrake. Failure to comply with these instructionscould cause injury to personnel and/or damageto property if the brake is installed or operatedincorrectly. For definition of limited warranty/liability, contact Rexnord Industries, Inc.,Stearns Division, 5150 S. International Dr.,Cudahy, WI 53110, (414) 272-1100.Caution1. Installation and servicing must be made incompliance with all local safety codesincluding Occupational Safety and HealthAct (OSHA). All wiring and electricalconnections must comply with the NationalElectric Code (NEC) and local electric codesin effect.2. Do not install the brake in atmospherescontaining explosive gases or dusts.3. To prevent an electrical hazard, disconnectpower source before working on the brake. Ifpower disconnect point is out of sight, lockdisconnect in the off position and tag toprevent accidental application of power.4. Make certain power source conforms to therequirements specified on the brakenameplate.5. Be careful when touching the exterior of anoperating brake. Allow sufficient time forbrake to cool before disassembly. Surfacesmay be hot enough to be painful or causeinjury.6. Do not operate brake with housing removed.All moving parts should be guarded.7. Installation and servicing should beperformed only by qualified personnelfamiliar with the construction and operationof the brake.8. For proper performance and operation, onlygenuine Stearns parts should be used forrepairs and replacements.9. After usage, the brake interior will containburnt and degraded friction material dust.This dust must be removed before servicingor adjusting the brake.DO NOT BLOW OFF DUST using an airhose. It is important to avoid dispersing dustinto the air or inhaling it, as this may bedangerous to your health.a) Wear a filtered mask or a respirator whileremoving dust from the inside of a brake.b) Use a vacuum cleaner or a soft brush toremove dust from the brake. Whenbrushing, avoid causing the dust tobecome airborne. Collect the dust in acontainer, such as a bag, which can besealed off.General DescriptionThe 87,700 Series coupler is a spring-set,electrically released, self adjusting brake. Thedouble C-face allows the brake to directlycouple a C-face motor to a C-face gearreducer. Or, for in-line application, the brakecan be mounted directly to a foot mountedC-face motor, using the bearing mountedoutput shaft as an in-line drive shaft.compensate for friction disc wear or normalexpansion.When brake is wired into motor circuit, startingthe motor will energize the solenoid andcompress the pressure spring. This actionremoves the force against the disc packcomponents and allows the friction discs torotate freely. De-energizing the motor deenergizes the solenoid and restores pressurespring force against the disc pack, therebystopping and holding the load.When the motor is off and the load is to bemoved without energizing the motor, themanual release lever should be used. Thisremoves the holding torque from the motorshaft, allowing it to be rotated by hand,however drag may be noted. The brake willremain in the manual release position until therelease lever is returned manually to their setposition or until the brake is re-energizedelectrically and the release lever or rod returnsto its set position automatically.Note: The motor should not be run with thebrake in the manual release position to avoidoverheating of friction disc(s).I. Installation ProcedureNote 1: Check face of motor to which brake isapplications only. Do not apply overhung orside load to brake output shaft.to be mounted, to be sure NEMA dimensionsof 0.004” T.I.R. on concentricity and face runout are met. Shaft run out is to be within 0.002”T.I.R. Maximum shaft end float is 0.020”. Usestandard length NEMA shaft.Operating PrincipleNote 2: The effectiveness of the dust-tightThe 87,700 Series brake utilizes one, two orthree rotating friction discs driven by a hubwhich is mounted on the motor shaft. Thesolenoid air gap is factory set, and normallyrequires no resetting even when changingfriction discs. A wrap spring clutch permits thesolenoid air gap to be adjusted automatically towaterproof brake enclosure depends on a fullyenclosed motor C-face as the brake face is notsealed.Note: Coupler brake is designed for in-lineA. Remove hub (16) from brake assembly.With key (not furnished) in place on motorshaft, slide hub (square, or splined, end first)onto shaft to 1” ( 1/32”) of standard motor

BACK TO PRODUCT PAGEC-face. Tighten the three set screws overthe motor shaft to 290 in-lb. (on single discbrake, the set screw over the keyway shouldbe tightened to 87 in-lb).Note 3: On most applications, particularly inRepeat this process several times to set airgap on solenoid. (Check Self-AdjustMaintenance Section for proper gapmeasurement, or corrective action forimproper gap.)vertical position, a set screw dimple drilled intoshaft is recommended.J. See Section on Electrical Connection ofBrake, Note 2.B. Remove housing bolts (15), lock washers(15W) and housing (7).K. Assemble housing and shaft assembly,rotating shaft (35) to engage key (35K) intohub keyway. Be sure housing is assembledwith manual release on right hand (solenoid)side (looking at output shaft side) or releaselever (148) will not latch. Replace housingbolts and tighten evenly to 118 lb-ft oftorque.C. Depress solenoid plunger (29) and tieplunger to frame (79).D. Remove entire support plate assembly (142)by evenly unscrewing screws (142S).Remove screws, conical spring washers(142W), and flat washers (142X).E. Remove pressure plate (5), friction disc (4)and stationary disc (3).Note 4: Brakes with a single friction disc donot have stationary discs. Vertically mountedbrakes will have springs to separate stationarydiscs (except one disc vertical below). Notecolor coded sequence of springs or refer toSheet 8-078-937-06 for proper assembly ofvertical mounting components.F. Attach endplate (2) to NEMA C-face ofmotor using four 1/2-13 socket head capscrews and medium spring lock washers(not supplied) torque per manufacturer’sspecifications. (Head of cap screws mustnot project above friction surface.)Note 5: If motor, with or without reducer, isto be ceiling mounted after assembly, entirebrake will have to be rotated 180 or “upsidedown” so it will be positioned with solenoidplunger (29) above frame when final assemblyis mounted on ceiling. Similarly, for horizontalwall mounting, rotate 90 .G. Reassemble friction discs (be surefriction discs slide freely, file I.D. ifnecessary), springs (if vertical), stationarydiscs, and pressure plate in correctsequence and position. All parts mustslide freely. The universal mountingpressure plate presently used has threetapered reliefs on outboard face.H. Mount support plate assembly, torquescrews to 50 in-lbs in endplate. Conicalspring washer installed under the screwhead. Flat washer used under theconical spring washer only withaluminum support plate. Be sure thatassembly is mounted with the solenoidin a vertical position (plunger above frame)as shown when brake is horizontal. Ifplunger is not tied down and has allowedthe mechanism to overadjust, it will haveto be reset before mounting support plate.In this case the lever arm (17) throat willbe near, or touching, the pinion (32) teeth.Refer to Figure 6 and Self-AdjustMaintenance. Loosen pressure springcap screw (19)until pressure spring (11) is free, mountsupport plate assembly to endplate,and retighten spring cap screw untilsnug. Do not overtighten! Torque to amaximum of100 in-lbs.I. Remove plunger tie-down. Manuallylift solenoid plunger to maximum traveland release. Complete electricalconnections, (See Section on ElectricalConnection of Brake.) Depress solenoidplunger manually or electrically, and allowit to snap up.B. Connecting AC solenoid coils on dualvoltage 230/460 three-phase motorsTo use a 230 volt coil (or a 230/460 dualvoltage coil connected for 230 volts) with a230/460 dual voltage three-phase motor, thebrake leads are connected across two motorterminals as shown, or other equivalentcombinations. If a 230 volt brake coil isconnected as shown in Figures 3 and 4 themotor can be operated on either 230 volts or460 volts with no effect on brake operation.AC Voltage Coil ConnectionClass H Coil (colored)Class B Coil (black)L. Remove access plug (7P). Insert a 3/16”hex wrench and tighten the two set screwsto 290 in-lb. (set screws are located 120 either side of the keyway).M. For reducer application, mount and securebrake/motor combination to mounting faceof reducer.For alignment when brake shaft is directconnected to another shaft by a couplingrefer to coupling manufacturer’s suggestedprocedure. Side or overhung load is notpermitted. Consult factory for reversingapplications.II. Electrical Connection of BrakeForPower Line A Power Line B Tie LeadsLow voltage1 and 32 and 4–High voltage123 and 4Figure 2CAUTION 1: Inverter Motor and SpecialControl Systems. This brake contains either asingle phase AC coil or DC coil that requiresinstantaneous power within 10% of rating atthe coil. A separate power source is requiredwhen this brake is used in conjunction with amotor or control system that limits voltage orcurrent input (i.e. inverter motors) or causes aramping of the power supply.CAUTION 2: Class H coils with terminals. Donot bend lead wire crimp connection as thiscauses a fatigue in the metal which may breakunder vibration.Note 1: Brake coil connections described herecover common motor connections. Fornonstandard motors or control connections,contact respective supplier or Stearns Division.Figure 3Figure 4C. DC coils - all modelsFor brakes with DC voltage rating, refer toInstructions sheet 8-078-950-00.III. General MaintenanceWarning! Any mechanism or load held inor pinched, and that leads will not be rubbedby friction disc, trapped between solenoidplunger and frame, caught between lever armand endplate, or by linkage.position by the brake should be secured toprevent possible injury to personnel or damageto equipment before any disassembly of thebrake is attempted or the manual release leveris operated on the brake. Observe all cautionslisted at the beginning of this manual.Note 3: On brakes with space heater, connectNote 1: Replacement part kits for many itemsto appropriate power source. Heater is to beenergized continuously, including storageperiods, if rust may occur.Note 2: Do not lubricate any part of the brakeNote 2: Be sure lead wires to coil are not tightA. AC coils, single voltageare available and contain retrofit instructions.as this may cause a malfunction and/or loss oftorque.1. Dual voltage coils may be factorypreconnected for high voltage unlessotherwise specified on brake purchaseorder. Checking coil connection issuggested.A. Coil replacement2. On single voltage coils, connect coil to anytwo leads on single or three-phase motorsof the same voltage as the brake. Refer tobrake nameplate and coil number for correctvoltage and frequency. See Figure 2 for dualvoltage coil connection and connect to anytwo leads of single or three-phase motor ofthe same voltage. The brake can also bewired to external switch contacts providingproper voltage other than that used tocontrol the motor. Normally, the motor andbrake contacts are interlocked.All standard NEMA DC voltage coils areavailable in assemblies and may also beobtained from appropriate parts list.2All standard NEMA AC voltage coils areavailable in kits. Select coil kit from appropriatereplacement parts list for the particular brakeseries being serviced.B. Friction disc replacementNote: Replace friction discs in single discbrakes when wear surface area is one half theoriginal disc thickness (1/4”). In multiple discbrakes, replace all friction discs when throat oflever arm (17) is within 1/16” of touching teethof pinion (32).

BACK TO PRODUCT PAGE1. Replacement friction discs for use with eithersquare or splined brake hubs are availablein kits. Select applicable kit from appropriateparts list for the brake being serviced.2. If brake uses metal carrier rings with bondedfriction linings (P/N 5-18-7001-00) for usewith splined hub obtain required quantity.Then proceed as follows:a) Observe cautions and warningspreceding Installation Procedure,Section I. Follow Steps L and K thendisconnect solenoid lead wires.b) Continue with Steps C through E andSteps G through L. Be sure to reconnectcoil leads before replacing housing (7).C. Other standard replacement partsThe standard 87,700 Series brakes usereplacement part kits or componentsdepending on the items involved. Consult PartsList P/N 8-078-917-07 (Sheet 366) for materialneeded.D. Self-adjust maintenance(See Figure 6)Since the self-adjust brake automaticallyadjusts itself for friction disc wear, maintenanceis held to a minimum. The solenoid is factoryset with a 13/16” to 15/16” air gap, andrequires no resetting, even when changingfriction discs. The gap is determined by theposition of wrap spring stop (76). Should airgap change, follow the steps listed below:1. If (stop) screws (76S) had been loosenedand retightened, the air gap may requireresetting. The gap is measured betweenmating surfaces of plunger (29) and solenoidframe (79), and may be increased by raisingslightly, or decreased by lowering slightly,wrap spring stop (76). Be sure to retighten(stop) screws (76S). Manually lift plunger tomaximum travel and release. Depressplunger, manually or electrically, and allow itto snap up. Repeat several times, thenrecheck air gap for factory setting of 13/16”to 15/16”.Note: To measure solenoid air gap onvertically mounted brakes, grasp solenoidlink to hold plunger in a free horizontalposition and move toward solenoid frameuntil spring pressure is felt. Holding firmly inthis position measure air gap betweenmating (ground) surface on solenoid frameand solenoid plunger. Adjust to proper gapas directed in Self-Adjust Maintenance.Check gap by again holding plunger asdirected.2. Tang of wrap spring (71) must be below, andmust make contact with, wrap spring stop(76) when solenoid lever (28) is manuallyraised. If stop is bent outward, allowing tangto bypass it, rebend to square position,assemble correctly, and reset solenoid airgap as described in Paragraph 1.3. Should air gap havedecreased ordisappeared, thesolenoid lever andpinion assembly (8)may have becomecontaminated due tolubrication or residueas a result ofoverheating of brake.For referencepurposes refer toFigure 7.Figure 6Tang A should align with the centerlineof hole B. Use kit #5-66-7371-00 ifreplacement is necessary.4. Check condition and positioning of pinion(32) and rack (part of lever arm assembly17). Replace parts as necessary withcomplete assemblies.E. Solenoid lever and pinion assemblyreplacementIf pinion (32) teeth are worn, replace entireassembly (8). Consult appropriate parts list forkit number. Check sector gear of lever arm (17)for wear.If sector gear teeth of lever arm (17) are worn,replace entire lever arm assembly available asa kit from appropriate repair parts list. Alsocheck pinion (32) teeth for wear. See Item 8.IV. TroubleshootingA. If brake does not stop properly oroverheats, check the following:1. Is manual release engaged, and is motorenergized?2. Friction discs may be excessively worn,charred or broken.3. Hub may have become loose and shiftedon shaft.4. Is hub clean and do friction discs slidefreely?5. Are controls which govern start of brakecycles operating properly?6. Are limit switches, electric eyes, etc.functioning properly?7. On vertically mounted brakes, aresprings in place in disc pack?See P/N 8-078-937-06.8. Have mounting faces loosened?Figure 739. Pressure spring may be improperlyassembled or broken.10. Is solenoid air gap adjusted correctly? (SeeSelf-Adjust Maintenance, Section III,Item D.)11. Check linkage for binding. The approximatepressure applied to the top of the solenoidlink to move plunger is:#5 coil#6 coil (15 lb-ft)#6 coil (25 lb-ft)#8 coil3 lbs5-1/2 lbs9 lbs16 lbsIf excessive force is required, determinecause of binding and correct. Do notoverlook bent, worn or broken plungerguides as a possible cause for binding.12. Solenoid lever stop (22) must be in placeon support plate.13. Solenoid may not be energizing andrelease the brake. Check voltage at the coiland compare to the coil and/or nameplatevoltage rating.14. Whether brake is AC or DC a voltage dropmay be occurring. If excessive drop involtage is noted, check wire size of powersource. Correct as needed.Note: A method to check voltage at coil isto insert a block of wood of theapproximate thickness of the solenoid airgap between the solenoid frame andplunger. (The block will prevent brake fromreleasing when coil is energized.) Connectvoltmeter leads at the coil terminals or leadwires. Energize coil. Voltmeter needle willnot fluctuate and reading can be taken.Reading should be taken immediately andthe coil de-energized to preventoverheating of the coil. Compare voltagereading with coil rating.

BACK TO PRODUCT PAGE15. Check slots of endplate for wear at theareas where stationary discs are in contact.Grooves in the slots can cause hang-up oreven breakage of ears of stationary discs.If grooving is noted, replace endplate.19. If stopping time is more than two seconds(rule of thumb) and/or the application ismore than five stops per minute, checkthermal requirements of load versusthermal rating of brake.16. Check that heads of mounting bolts do notextend above wear surface of endplate.20. Use Loctite 242 to secure link screw nut(13N) to link screw (13C) if vibrationcauses nut to loosen.17. Check pressure spring length to insurecorrect compressed height. Approximateoriginal spring lengths are given in thefollowing table so that correct setting maybe verified and corrected if necessary. Withworn friction discs, add amount of wear tothe approximate spring length shown intable.18. If a heater is supplied and excess rustinghas occurred in brake, check power sourceto heater to be sure it is operating and thatheater is not burned out.Black6CompressedSpring ge25 & 503-1/4”Purple35, 75 & 1053-1/4”ColorTorque (lb-ft)B. If brake hums, solenoid pulls inslowly, or coil burns out, check thefollowing:1. Voltage supply at coil versus coil rating.2. Is solenoid air gap excessive?(See Self-Adjust Maintenance.)3. Shading coils may be broken.4. Plunger guides may be excessively worn.Does solenoid plunger rub on solenoidframe laminations? If so, replace plungerguides.5. Solenoid frame and plunger may beexcessively worn.6. Is solenoid dirty?9. Excessive voltage drop when motor starts.Check size of lead wires for motor startingcurrent and solenoid inrush current. SeeSection IV-A, Item 11, 12, 14 and 15.C. If brake is noisy during stopping:1. Check mounting face run out, mountingrabbet eccentricity and shaft run out. SeeInstallation Procedure, Section I, Note 1.Correct as required.2. Check for signs of the outside diameter ofthe friction disc(s) rubbing on the insidediameter of the endplate. This would indicatebrake is eccentric with respect to the motorshaft and/or the shaft is deflecting during astop. Check alignment and shaft diameter.Also check for worn motor bearings. Ifrealignment does not correct the problem, alarger diameter shaft may be required. Shaftdeflection may also be caused by excessiveoverhang of brake from motor bearing.Additional shaft support may be required.3. Check for bad motor bearings. Replaceif necessary. Check for excessive shaftendfloat. Correct as required.7. Solenoid mounting screws may havebecome loose, causing frame to shift andplunger to seat improperly.8. Sector gear and pinion teeth may bejamming due to excessive tooth wear.Copyright 2004 by Rexnord Industries, Inc.Rexnord Industries, Inc., Stearns Division, 5150 S. International Dr., Cudahy, WI 53110 (414) 272-1100 Fax: (414) 277-4364

BACK TO PRODUCT PAGE P/N 8-078-917-57Spring-Set Disc Brakeseffective 03/27/09Parts List for 87,700 Series Brakes (rev. B)Information required when ordering replacement parts: Give part number of parts or kits needed, brake model number, and brake serial number. Thebrake model and serial number may identify special brakes not covered by this parts list. Description items in CAPITALIZED BOLD ITALICS are recommended spare parts. One setper 5 brakes in service is recommended. Enclosures are designated as follows:O Standard E Dust-tight, waterproof (DTWP) Housing and manual release assembly (Item B) includes manual release kit (Item BA).For installation and service instructions, see Sheet 8-078-927-07. Detailed service instructionsheet is included with each kit.AVerticalMountingNote:SEE INSTALLATION AND SERVICE SHEET ORINSTALLATION LABEL INSIDE OF HOUSING BEFOREINSTALLING, OPERATING OR SERVICING BRAKE.Model numberRev.108775203QBTorque lb-ftMODEL NUMBERwill appear on brakenameplate.Serial numberBMountingVoltsAmps inrushHertzAmps holdingLR 6254Rex

1 Maximum solenoid cycle rate is based on ambient temperature of 72 F (22 C)with 50% duty cycle. Does not relate to brake cycle rate (see Thermal Capacity). . *Keyseats made to ANSI B17.1 standard. BACK TO PAGE 1 Current Ratings (amperes) Voltage: 50 Hz 24 95 38.0.5 8.4.1 Voltage: 60 Hz 42.8.6 11.7.2 Coil Size AC Current 115 200 230 400 460 .

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