TORSIONAL COUPLINGS LF TORSIONAL ASSEMBLY INSTRUCTIONS 25 Models 1,2 and 3 » Place hubs on shafts or the adaptor plate onto the flywheel. If a key is used, ensure it does not extend past the end of the s haft. » Attach rubber element to the flanged hub or adaptor plate with the axial screws. Hand tighten. Be sure to place a drop of oil or grease under each screw head to reduce friction and twisting of the element at final assembly. » Align equipment so the cylindrical hub in the other shaft is placed into the centre of the element. Install the radial screws. » Tighten all axial screws first then all radial screws to the correct torque shown in the table on the previous page. Tighten set screws if applicable. Models 1/S, 2/S & 3/S » As above except: » Install S-type axial screws on flanged hub or flanged plate to correct torque value. » Mount the element on the cylindrical hub and fasten with radial screws. Torque these screws to the correct value. Do not forget to place a drop of oil or grease under the screw head before fastening. Also make sure the hub is set on the shaft with the correct shaft engagement. Normally the end of the shaft is flush with the end of the hub. Tighten set screws. » Pilot the hub assembly onto the flanged hub or adaptor plate. LF Torsional Alignment andAssembly Notes After assembly the coupling should be aligned carefully for long service life. Naturally, the higher the speed, the greater the care should be taken in alignment. In Model 2, alignment can easily be checked with a straight edge. The outer diameter of the flanged hub must be flush with the element diameter where the radial screws are placed. Check each position for correct alignement. In Models 1 and 3 the distance must be measured at each axially bolted point of the rubber element and should be set as accurately as possible to the value “Z” shown here in the table. In models that use the S-style screws, alignment is normally not required. The parallel and angular misalignment is small when the equipment is flange mounted. An example of this would be a hydraulic pump mounted to an SAE engine pump mounting flange. Hytrel ® Torsional couplings are flange mounted only. Standard assembly “S” style assembly HTR Alignment Values (mm) Size Dimension S Dimension Z 1 2 13.0 2 4 22.5 4 4 27.5 8 4 30.0 12 4 31.0 16 6 40.0 22 6 40.0 25 6 42.5 28 6 42.5 30 8 50.0 50 8 50.0 80 4 52.5 90 8 67.5 140 8 67.5 250 8 90.0 400 10 100.0 #DriveLineHarmony www.jbj.co.uk/torsional-couplings.html
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