www.jbj.co.uk/electromagnetic-clutches.html 9 #DriveLineHarmony INDUSTRIAL CORP OGURA Electromagnetic Clutches MMC Series Installation & Maintenance 5. Loosely install mount bracket bolts, nuts, lock washers, Re-check alignment, and tighten all bolts. 6. Mount pump to foot bracket on opposite side from clutch. (NOTE: lubrication and cleanliness of the pump shaft and clutch bore is important. Thoroughly clean these areas if any contamination.) Apply a thin coating of molybdenum disulfide grease on the shaft and in the bore of the clutch. Wipe away any excess grease and make sure no grease gets on armature or rotor assembly. Do not use anti-seize compounds as this will wear down clutch spline. Use mounting bolts long enough to engage at least three-fourths of the threads in the mounting bracket. Always use lock washers. 3. Loosely position the clutch/bracket assembly on themounting platform. A. Installation. 2. Mount the clutch to the bracket with the bolts provided from the OEM or distributor that sold you the bracket. For some MMC-28 series 271 Nm (200 lb-ft) clutches the bolts go through the u-shaped slots on the clutch, and the bracket supporting the clutch is tapped. Other 28 series have a 4-bolt pattern where the back of the clutch field is tapped with a half inch space 13 UNC-2B thread. For MMC-60 & 140 series 542 & 1355 Nm (400 & 1000 lb-ft) clutches the support bracket has a through hole and the back of the clutch assembly has 8 holes that require a 3/8"-16 UNC by 5/8" deep. The MMC-210 series 2033 Nm (1500 lb-ft) clutches have 8 holes, 7/16" 14-2B thread 1 inch deep. The bolt should be long enough to go through the support bracket and go approximately half an inch into the clutch. 4. If necessary, drill required holes in platform to correspond to the foot mount bracket on the clutch. 1. Amounting bracket is required to support the clutch. This is normally supplied to the original manufacturer or through a mobile hydraulics distributor. If your clutch did not come with a mounting bracket, this must be purchased and/or fabricated first for proper installation. All bolts used for the installation should be torqued based upon the grade bolt you are using. 7. For universal joint input, connect universal joint companion flange to the four holes in the clutch face (or other direct inline coupling. Make sure driveline yoke ears are in phase. If not, remove u-joint, separate joint at the spline and rotate 90 degrees. Shaft misalignment must be less than 3º angularly with a shaft concentricity run out of nomore than .003 thousandths of an inch. 10. If full torque is required of the clutch should be burnished. Burnishing involves running the clutch at around 1,000 to 1,200rpm and cycling the clutch four times per minute at a reduced load. This should be done for 30-50 cycles. 1. CAUTION: At the moment of engagement, the clutch must accelerate all related inertial load of the clutch components and other components being put into rotary motion. The larger the clutch and related components the higher the inertia load. Higher R.P.M. engagement of the clutch creates and excessive shock load and may cause breakage of the springs and/or clutch slippage and ultimate clutch failure. Please refer to these recommendations regarding maximum clutch engagement R.P.M. B. Additional Information. MMC28 271.164 (200) 2,500 3,600 MMC60 542.327 (400) 1,800 3,000 MMC100 949.073 (700) 1,500 2,500 MMC140 1355.818 (1000) 1,200 2,500 9. Connect clutch to either 12v or 24v power supply. When voltage/current is connected, the clutch will become engaged and with no current/voltage going to the clutch, the clutch will be disengaged. The clutch coil is not polarized, so it does not matter which wire is connected to positive and/or negative. Use of a surge protector is recommended in the Clutch electrical circuit. One is supplied with each clutch at no charge. It is a good idea to replace the surge protector when replacing the clutch. (Information on the surge protector circuit follows below.) ClutchModel Torque RatingNm (lb-ft) MaximumEngagement RPM MaximumOperatingRPM 8. For belt input, make sure the pulley on the clutch is in alignment with the driving pulley, install belt and tighten based upon belt manufacturer's recommendations. Install drive line between clutch and power source. Install bolts, nuts and lock washers and torque to specified limits. MMC210 2033.727 (1500) 1,200 1,800
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