Eaton Airflex WSB11206 Installation, Operation And Maintenance Manual

EATON WSB11206 WCSB Tensioner / Brake with ORB Coolant Ports Installation, Operation and Maintenance Manual E-CLCL-II009-E August 2015 153.4.2 Air pressure is first applied through the ports in themounting flange / cylinder (112) to apply force to thepiston (33) in the WCSB tensioner / brake assembly.Adequate pressure should be applied to supportthe load the WCSB tensioner / brake assembly iscontrolling. Air pressure is then applied through theports in the cylinder (19) on the spring set sectionof the WCSB tensioner / brake assembly, until it isfully released.CautionObserve all pressure and speed limits whileoperating the WCSB tensioner / brake assembly.See Section 3.2.3.4.3 After release of the spring set brake, slowly relievethe air pressure within the mounting flange /cylinder (112) to reduce the clamp force applied tothe friction disc assemblies (7), allowing the shaftto rotate. Modulation of the air pressure will varythe applied torque of the WCSB tensioner / brakeassembly. Modulation control is dependent upon thespecific pneumatic control system used. Refer to themanufacturers information for operation of controlvalves or feedback systems.3.4.4 WCSB tensioner / brake assembly with dual pressurepistons (33) provide a more finite range of control.Each chamber within the dual pressure piston can bepressurized independently or simultaneously.CautionWhen applying or exhausting operating pressure toonly one of two ports on units with dual pressurepistons (33), the second piston pressure port mustbe open/vented to atmosphere. Open ports shouldbe filtered to avoid contamination of the piston andcylinder during piston operation.3.4.5 Exhausting air pressure from the cylinder (19) of thespring set brake allows it to engage. Air pressurewithin the mounting flange / cylinder (112) can beexhausted simultaneously with that in the cylinder(19). For more rapid brake response, exhaust the airpressure in the mounting flange / cylinder (112) afterengaging the spring set brake.Note: The spring set brake is intended for parking oremergency braking only.WarningDynamic braking with the air cooled,spring set brake is not recommended except foremergency stopping situations or during initialwear-in. High heat generated during dynamicbraking can result in damage or failure of theWCSB tensioner / brake assembly's components.CautionRapid engagement of a fully released WCSBtensioner / brake assembly could result in pressurespikes within the coolant cavities and subsequentleakage.3.5 Periodic Maintenance3.5.1 As the friction material wears, adjustment ofthe brake may be required to keep pistons andcylinders within the proper stroke range.See the MAINTENANCE section for wear adjustmentprocedures and component wear limits.3.5.2 Periodically check for external air leakage in thearea of the piston seals (21) (23), and internal leakageacross the dual pressure piston seals (114).For replacement, refer to procedures inSection 4.6, Maintenance.3.5.3 Moisture that may accumulate in the brake cylindercan be purged on size all WCSB tensioner / brakeassemblies. With air pressure exhausted from thecylinder, remove the pipe plug (105) at the 6 o’clockposition on the cylinder, and apply low air pressure toassist in expelling any excess moisture. After drainingthe cylinder, reinstall the pipe plug, applying a pipethread sealant on the threads prior to installation.CautionApplied air pressure greater than 10 psig (.69 Bar)should not be used when draining the cylinder. Useadequate shielding to avoid contact with direct sprayfrom moisture being purged from the cylinder.3.5.4 Periodically observe the discs while the brake ortensioner is fully released. Dragging discs maybe caused by wear or contamination of the gearor disc splines, disc imbalance, warped discs, ormisalignment. Correct as required.3.5.5 Pneumatic and electrical control interlocksshould be periodically checked for proper settingsand operation.WCSB tensioner / brake with ORB coolant ports