B275 Clutch Sheave, Pilot and Coupling Mount 1 FORM NO.
In accordance with Nexen’s established policy of constant product improvement, the specifications contained in this manual are subject to change without notice. Technical data listed in this manual are based on the latest information available at the time of printing and are also subject to change without notice. Technical Support: 800-843-7445 (651) 484-5900 www.nexengroup.com DANGER Read this manual carefully before installation and operation.
Table of Contents General Specifications -------------------------------------------------------------------------------------------------------------------------- 4 General Safety Precautions ------------------------------------------------------------------------------------------------------------------- 4 Installation ------------------------------------------------------------------------------------------------------------------------------------------- 5 Lubrication ----------------------------------
General SPECIFICATIONS Specifications: Torque Up to 11.3 Nm (100 in-lbs) Actuation Pressure 1 - 5.5 bar (14.5 - 80 psi) Service Temperature 4.5 - 104 C (40 - 220 F) Approximate Weight Up to 1.8 kg (4 lbs) Product Number Bore Size Mounting Configuration Friction Facing Type 802870 0.625 in [15.88 mm] Pilot Standard 802871 .0500 in [12.70 mm] Pilot Standard 802872 0.625 in [15.88 mm] Sheave, 1 "A" 3.0 in PD Groove Standard 802873 0.625 in [15.88 mm] Sheave, 1 "3V" 2.
INSTALLATION SHEAVE AND PILOT MOUNTING NOTE: Refer to Figure 1. B-275 Clutch Mounting Shaft 1. Insert the Key (Item 21) into the keyway of the mounting shaft. Set Screw (Item 20) 2. Slide the B-275 Clutch onto the mounting shaft until the Key (Item 21) is seated in the B-275 Clutch. Key (Item 21) 3. Insert and tighten the two Set Screws (Item 20). FIGURE 1 COUPLING Adapter MOUNTING NOTE: Refer to Figure 2. Pilot Mount B-275 Clutch 1. Insert the Key (Item 21) into the keyway of the mounting shaft.
LUBRICATION NOTE Nexen pneumatically actuated devices require clean, pressure regulated air for maximum performance and life. All seals in Nexen pneumatically operated devices are lubricated for life, and do not require additional lubrication. However, some customers prefer to use an air line lubricator, which injects oil into the pressurized air, forcing an oil mist into the air chamber.
AIR CONNECTIONS (continued) All Nexen pneumatically actuated devices require clean and dry air, which meet or exceeds ISO 8573.1:2001 Class 4.4.3 quality. The following is a common air supply scheme used with this product. This is an example and not an all-inclusive list. All air circuits to be used with this product must be designed following EN983 guidelines. NOTE For quick response, Nexen recommends a quick exhaust valve and short air lines between the Control Valves and the product.
PARTS REPLACEMENT CAUTION Friction Disc-Piston Assembly Working with spring loaded or tension loaded fasteners and devices can cause injury. Wear safety glasses and take the appropriate safety precautions. Spring Retaining Wave Spring Washer (Item 5) (Item 23) NOTE: Refer to Figures 5, 6, 7 and 8 Bearing (Item 3) 1. Remove the Retaining Ring (Item 2) from the pilot end of the clutch. Hub 2.
PARTS REPLACEMENT (continued) CAUTION 13. Remove the Retaining Ring (Item 28) from the Piston (Item 13). Working with spring loaded or tension loaded fasteners and devices can cause injury. Wear safety glasses and take the appropriate safety precautions. 14. Fully support the Piston (Item 13) and press the Ball Bearing (Item 32) out of the Piston (Item 13). 15. Clean the bearing bore of the Piston (Item 13) with fresh safety solvent, removing all old Loctite residue.
Troubleshooting Symptom Failure to engage Failure to disengage Loss of torque Excessive drag on the air line Probable Cause Solution Air not getting to the B-275 due to a control valve malfunction Check for a control vlave malfunction or low air pressure nad replace the control valve if necessary. Air leaks around the O-ring Seals Replace the O-ring Seals.
REPLACEMENT PARTS LIST Piston (Item 13) Sheave (Item 4) or Pilot Mount Disc (Item 15) Retaining Ring (Item 2) Retaining Ring (Item 28) Wave Spring Friction Disc (Item 5) Assembly (Item 7) Seal (Item 10) Bearing (Item 32) Washer (Item 23) Bearing (Item 3) Retaining Ring (Item 2) Retaining Ring (Item 30) Air Fitting (Item 18) Set Screw (Item 20) Hub (Item 1) Seal (Item 11) Air Chamber (Item 9) Bearing (Item 8) ITEM DESCRIPTION QTY ITEM DESCRIPTION QTY 1 Hub 1 13 Piston 1 1 2 Retaining
WARRANTY Warranties Nexen warrants that the Products will (a) be free from any defects in material or workmanship for a period of 12 months from the date of shipment, and (b) will meet and perform in accordance with the specifications in any engineering drawing specifically for the Product that is in Nexen’s current product catalogue, or that is accessible at the Nexen website, or that is attached to this Quotation and that specifically refers to this Quotation by its number, subject in all cases to any lim
