JRC JMA-5212-4/6 User Manual page 398

Precautions in Mounting the Cover
When the cover is removed for regular checkup and replacement of parts and refitted after such work, the
procedure of fastening bolts shall be taken with the following precautions:
(a) The proper fastening torque of the fitting bolts (M8) is 1176 to 1470 N•cm (120 to 150kgf•cm) (which
makes the inside water-tight and protects the packings against permanent compressive strain).
The packings start producing from the cover at a torque of approximately 1470N•cm (150kgf•cm).
Do not fasten the bolts with a torque exceeding the specified value. Otherwise, the screws may be broken.
(b) Use an offset wrench of 11 mm u 13 mm or a double-ended wrench of 13 mm u 17 mm (not longer than
200 mm).
(c) Screw all the bolts by hand first to prevent them playing, then fasten them evenly in order not to cause
one-sided fastening. (Fasten the bolts with 25% of the required torque at the first step.)
*: Fasten the bolts in the diagonal order.
4-M8 (stainless steel) bolt
Tightening torque: 120 to 150 kgf/cm
8-M8 (stainless steel) bolt
Tightening torque: 120 to 150 kgf/cm
4-M8 (stainless steel) bolt
Tightening torque: 120 to 150 kgf/cm
Bolt Tightening Procedure of NKE-2103 Cover
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