AIR CHAMP PRODUCTS Modular Units: MDU, MOU, MBU, and MIU Modular Combinations: MDO, MDB, MIDO, MIDB, and MIB Models: 625 & 875 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 Connecting Units to Form Combinations -----------------------------------------------------------------------------------------------5 Mounting Modular Brake Units---------------------------------------
GENERAL SPECIFICATIONS Specifications Torque: Clutch: Up to 48 Nm (425 in-lbs) Brake: Up to 62 Nm (550 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 20.4 kg (45 lbs) GENERAL SAFETY PRECAUTIONS WARNING CAUTION Ensure proper guarding of the product is used. Nexen recommends the machine builder design guarding in compliance with OSHA 29 CFR 1910 “Occupational Safety and Health Hazards”.
CONNECTING UNITS TO FORM COMBINATIONS MODULAR CLUTCH (MDO) Modular Drive Unit Refer to Figure 1. Modular Output Unit NOTE The Modular Drive Unit (MDU) Ball Bearing (Item 27) is loose fitting by design. Do not allow this Ball Bearing to fall off the MDU. 1. Place the Modular Drive Unit (MDU) on a table with the Ball Bearing (Item 27) facing up and properly seated against the Retaining Ring on Models 625 and 875. 2.
CONNECTING UNITS TO FORM COMBINATIONS (continued...) MODULAR INPUT CLUTCH (MIDO) Refer to Figure 3. Modular Input Unit NOTE The Modular Drive Unit (MDU) Ball Bearing (Item 27) is loose fitting by design. Do not allow this Ball Bearing to fall off the MDU. 1. Place the Modular Drive Unit (MDU) on a table with the Ball Bearing (Item 27) facing up and properly seated against the Retaining Ring on Models 625 and 875. 2.
CONNECTING UNITS TO FORM COMBINATIONS CAUTION Never substitute Hex. Head Cap Screws for the Socket Head Cap Screws (Item 31). NOTE Make sure the air inlet ports are properly aligned for your mounting requirements. 5. (continued...) 6. Alternately and evenly tighten the four Socket Head Cap Screws (Item 31) to 35 ft-lb [47 Nm] torque (See Figure 4). 7. Place the Key (Item 19) into the shaft of the Modular Input Unit (MIU). Slide the MIU shaft into MDU (See Figure 4). 8. Using the four Hex.
MOUNTING MODULAR BRAKE UNITS (MBU) (continued...) ALL MODELS AND MOTOR TO A REDUCER TABLE 1 CAUTION When mounting sheaves or sprockets, refer to Table 1 for overhung load data. Exceeding the data in Table 1 will result in premature failure to the Modular Unit. 1. OVERHUNG LOAD DATA Place the Key (Item 19) into the output shaft of the Modular Unit and slide the output shaft of the Modular Unit and motor into the reducer. 2.
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...) The following are common air supply schemes used with this product. These are examples and not an all-inclusive list. All air circuits to be used with this product must be designed following EN983 guidelines.
TROUBLESHOOTING MODEL SYMPTOM PROBABLE CAUSE SOLUTION MIU (Modular Input Unit) Bearing noise. Damaged Ball Bearings. Replace the Ball Bearings. Leaking O-Ring Seals. Replace the O-Ring Seals. Lack of lubrication on the Hub Spline. Lubricate the Hub spline with Never-Seez®. Damaged Ball Bearings. Replace the Ball Bearings. Improper air pressure settings or faulty controls. Adjust the air pressure setting or replace the controls. Lack of lubrication on the Hub spline.
PARTS REPLACEMENT NOTE Modular Units must be unmounted and separated into individual components prior to maintenance or repair. Make sure you are in the correct section for the size and model of the Modular Unit you are repairing. MODULAR INPUT UNIT (MIU) Models 625 & 875 30 35 19 11 19 58 CAUTION Special attention should be exercised when working with retaining rings. Always wear safety goggles when working with spring or tension loaded fasteners or devices. 1.
PARTS REPLACEMENT (continued...) MODULAR DRIVE UNIT (MDU) Models 625 and 875 43 1 41 26 36 4 37 40 7 27 16 6 14 34 FIGURE 12 1. Remove the old Ball Bearing (Item 27) (See Figure 12). 10. Reinstall the Retaining Ring (Item 40) (See Figure 12). 11. Support the inner race of the new Ball Bearing (Item 26); then, press the Friction Disc (Item 7) into the Piston (Item 4) and new Ball Bearing (Item 26) (See Figure 12).
PARTS REPLACEMENT (continued...) MODULAR BRAKE UNIT (MBU) Models 625 and 875 15 17 9 9 25 8 FIGURE 13 25 29 5 44 2 39 38 28 12. Remove the six old Flat Head Screws (Item 25) securing the old Friction Facing (Item 9) to the Disc Journal (Item 8) and remove the old Friction Facing. CAUTION The four Guide Spring Guide Pins (Item 17) hold the four Compression Springs (Item 15) in place. Always wear safety goggles when working with spring or tension loaded devices. 13.
PARTS REPLACEMENT (continued...) MODULAR OUTPUT UNIT (MOU) Models 625 and 875 9 3 25 39 8 29 28 12 38 FIGURE 14 Refer to Figure 14. CAUTION Special attention should be exercised when working with retaining rings. Always wear safety goggles when working with spring or tension loaded fasteners or devices. 8. Tighten the six Flat Head Screws to 22 in-lb [2.50 Nm] torque. 9. Clean the Bearing Bore of the Housing (Item 3) with fresh solvent, making sure all old Loctite® residue is removed. 1.
REPLACEMENT PARTS When ordering replacement parts, specify model designation, item number, part description, and quantity. Purchase replacement parts through your local Nexen Distributor. The item or balloon number for all Nexen products is used for part identification on all product parts lists, product price lists, unit assembly drawings, bills of materials, and instruction manuals. NOTE Make sure you are in the correct section for the size and model of your Modular Unit.
REPLACEMENT PARTS (continued...) MODULAR DRIVE UNIT (MDU) 1 50 24 33 41 14 43 6 4 36 16 37 34 26 27 40 7 FIGURE 16 MODELS 625 AND 875 1 ITEM DESCRIPTION QTY ITEM DESCRIPTION QTY 1 4 6 7 141 16 19 24 261 Housing Piston Hub Friction Disc Compression Spring Spring Retainer Washer Key (Not Shown) Lock Washer Ball Bearing 1 1 1 1 1 1 1 4 1 271 33 34 36 37 40 411 431 50 Ball Bearing Hex. Head Cap Screw Retaining Ring (Ext.) Retaining Ring (Ext.) Retaining Ring (Ext.) Retaining Ring (Int.
REPLACEMENT PARTS (continued...) MODULAR BRAKE UNIT (MBU) 19 50 22 17 15 25 18 9 8 25 9 5 44 28 42 38 31 2 29 39 FIGURE 17 MODELS 625 AND 875 ITEM DESCRIPTION QTY 2 5 8 91,2 12 151 17 18 19 22 Housing Piston Disc Journal Friction Facing Spacer Compression Spring Spring Guide Pin Eye Pin Key Spring Pin 1 1 1 2 1 4 4 4 1 4 1 Denotes Repair Kit item. MBU 625 and 875 Repair Kit No. 930200. 2 Denotes Friction Facing Kit item. MBU 625 and 875 Friction Facing Kit No. 930276. FORM NO.
REPLACEMENT PARTS (continued...) MODULAR OUTPUT UNIT (MOU) 50 19 3 25 29 39 12 9 28 38 8 31 FIGURE 18 MODELS 625 AND 875 ITEM 3 8 91,2 121 19 251,2 DESCRIPTION QTY ITEM DESCRIPTION QTY Housing Disc Journal Friction Facing Spacer Key Flat Head Machine Screw 1 1 1 1 1 6 281 291 31 38 39 50 Ball Bearing Ball Bearing Socket Head Cap Screw Retaining Ring Retaining Ring Housing Guard 1 1 4 1 1 1 1 Denotes Repair Kit item. MOU 625 and 875 Repair Kit No. 930300.
ACCESSORIES MODULAR HOUSING GUARDS TYPE Ring Guard Waterproof Guard (Not Shown) MODELS PRODUCT NUMBER All 625 and 875 929500 MBU 625 and 875 929502 MDU 625 and 875 929501 FIGURE 19 HOUSING GUARD MODULAR FOOT MOUNTS TYPE U-Shaped Foot Mount L-Shaped Foot Mount MODELS PRODUCT NUMBER All 625 and 875 929300 MBU 625 and 875 FIGURE 20 U-SHAPED FOOT MOUNT 931000 FIGURE 21 L-SHAPED FOOT MOUNT FORM NO.
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
