Assembly Torque Specifications - Janome QMP16SU Manual

Assembly Torque Specifications

The Torque Specifications apply to all internal and external fasteners in sizes 4.0, 5.0 and 6.0 mm in general
at ISO 4762 Screw class 8.8. The torque specifications are also generally classified as soft-jointed and are
listed according to size and placement in the machine.
1. 4 mm Allen socket head cap screws, Class 8.8 @ 2.5 Nm (Uses 3 mm Allen tool)
• Head-frame, bearing retainers, front cover small
2. 4 mm Allen set screw, class 8.8 @ 1.2 Nm (Uses 2.0 mm Allen tool)
• Tension assembly, three-hole thread guide, motor pulley, hook
3. 5 mm Allen socket head cap screw class 8.8@ 5.6 Nm (Uses 4 mm Allen tool)
• Front cover large
• Belt tensioner
• Drive-train bracket
4. 5 mm Allen set screw, Class 8.8 @ 2.4 Nm (Uses 2.5 mm Allen tool)
•Main shaft timing pulley, hook-shaft timing pulley
• Main shaft timing collar, hook-shaft timing collar
5. 6 mm Allen socket-head cap screws Class 8.8 @ 9.9 Nm. (Uses 5 mm Allen tool)
An exception must be observed here since the screws are considered soft-jointed and shallow-threaded
and are used externally. It is therefore advised that this torque specification not exceed 6 Nm.
• Base plates
6. 6 mm Allen set screw, Class 8.8@ 4.5 Nm (Uses a 3 mm Allen tool)
• Hand wheel
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QMP16SU Service Manual