Engine Bellhousing and JXL Anti-Static Flame Proof Flywheel Coupling 3 of 6 The coupling pins are tightened to the correct torque prior to leaving jbj Techniques Ltd; these values should be re-checked prior to installation. Under no circumstances should the couplings be assembled with the pins tightened to any torque other than the specified values. Mounting This guide is for the installation of JXL flywheel couplings when an engine bellhousing is used. In most cases the diameter of the hub is smaller than the centre locating diameter of the bellhousing. The hub passes through the bore in the bellhousing which connects the pump with the flywheel housing. In this case the installation can be carried out as follows: 1) Fit the drive flange to the engine flywheel and tighten bolts to enginemanufacturers recommendations. 3) Fit the coupling hub to the pump shaft, position the hub suitably to obtain the correct setting distance (see the arrangement drawing if supplied), tighten grub screw(s) or L-Lock screw(s) if the pump has a splined shaft and re-check the setting distance. Coupling hubs with cylindrical bores are supplied with an additional grub screw at 90° to the keyway. If the additional grub screw is not to be used it must be removed from the coupling hub. the housing and that no rotating component is within 5mm of any non-rotating component and tighten bolts to the engine manufacturer’s recommendations. Tightening Torques for JXL Couplings Maintenance 2) Fit the bellhousing to the engine flywheel housing and tighten bolts to enginemanufacturers recommendations. If the additional grub screw is not to be used it must be removed from the coupling hub. For the occasional case where the hub diameter is larger than the bore in the bellhousing, the installation should be carried out as follows: 3) Fit the pump centring to the pump (when supplied) then fit the coupling hub to the pump shaft, position the hub suitably to obtain the correct setting distance, (see arrangement drawing if supplied), tighten grub screw(s) or L-Lock screw(s) if the pump has a splined shaft, and re-check the setting distance. Coupling hubs with cylindrical bores are supplied with an additional grub screw at 90° to the keyway. If the additional grub screw is not to be used it must be removed from the coupling hub. 1) Fit the drive flange to the engine flywheel and tighten bolts to enginemanufacturer’s recommendations. 2) Fit the bellhousing to the pump. 4) Offer up the pump, coupling hub and bellhousing to the engine flywheel housing ensuring that there is no loosematter i.e. grub screws, washers, etc. remaining inside Tighten all bolts to the correct torque values. We recommend the use of shake proof washers with all bolts. 4) Fit the pump and coupling hub to the bellhousing ensuring that there is no loose matter i.e. grub screws, washers, etc. remaining inside the housing and that no rotating component is within 5mmof any non rotating part. Periodically check flange alignment and resilient elements for wear. Worn elements must We recommend the resilient elements are inspected on an annual basis. be replaced and are available from jbj Techniques. Please quote serial number. Misalignment must be rectified. Inspection and maintenance is the responsibility of the end user. Note All couplings plus or minus 50% of flange gap (dimension C) setting distance. Axial Misalignment All JXL couplings are capable of accepting a momentary overload of twice nominal torque and have an operating temperature range of -50°C to +105°C. TX note During operation bellhousings and JXL couplings do not generate heat therefore operational surface temperature will depend on the temperature of mating components and surroundings. Refer to BS EN ISO 80079:36 11.2f) Equipment ‘T’ class or maximum temperature (T max) to be determined by machine builder but must not exceed 105°C.
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