TORSIONAL COUPLINGS LF TORSIONAL ASSEMBLY INSTRUCTIONS 24 Assembly Notes and Instructions - Important Notes For optimum coupling performance and longevity, the radial and axial screws connecting the element to the hubs or adaptor plate must be tightened to the torque given in the table below. It is recommended that a torque wrench be used. This is particularly important with larger couplings. Tightening “by feel” is normally insufficient. Tightening torques which are too low will inevitably lead to slackening of the screws and consequently lead to undesireable results. In order to reduce friction between the screw head and the metal insert in the element, it is suggested that a small amount of grease be applied to the underside of the screw head before assembly. This also reduces the possibility of twisting the element as illustrated in the diagrams below. It is important that the element be mounted correctly and not be twisted. Mounting Screws Each radial and axial mounting screw is treated for corrosion resistance (minimum grade DIN 8.8, SAE Grade 8) and the threads are coated with micro-encapsulated adhesive. The adhesive is released at assembly and further enhances the performance and safety of the coupling. For adequate effect, the adhesive should be allowed to harden for 4-5 hours prior to operation. Note: Anaerobic adhesives (such as Loctite ™, etc,) should NOT be used as they have a detrimental effect on the bond between the rubber and the insert if dripped or splashed to those areas. Recommended adhesives are 3M™2353 or Nylok Precote 80 or equivalent. Screws that we provide with this adhesive may be used up to three times. Cor rect Incor rect S-style Standard axial screw radial & axial screw Coupling Size Radial and Axial Screws L-Loc Screws Screw Size Thread Pitch Quantity Torque (Nm) Set Screw Torque (Nm) LF1 M6 1.00 4 10 - - LF2 M8 1.25 4 25 - - LF4 M8 1.25 6 25 - - LF8 M10 1.50 6 50 M10 30 LF12 M10 1.50 8 50 M10 30 LF16 M12 1.75 6 90 M12 50 LF22 M12 1.75 8 90 M14 70 LF25 M14 2.00 6 140 M14 70 LF28 M14 2.00 8 140 M16 120 LF30 M16 2.00 6 220 M16 120 LF50 M16 2.00 8 220 M16 120 LF80 M16 2.00 8 220 M16 120 LF90 M20 2.50 6 500 M20 200 LF140 M20 2.50 8 500 M20 200 LF250 M20 2.50 12 500 M20 200 LF400 M20/M24 * 8/4 610/1050 * * *Contact jbj Techniques Limited technical office, telephone: 01737 767493 or email: info@jbj.co.uk #DriveLineHarmony www.jbj.co.uk/torsional-couplings.html
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