JRC JMA-932B-SA User Manual page 361

Precautions in Mounting the Cover
When the cover is removed for regular checkup and replacement of parts and refitted after such work, the
procedures 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 × 13 mm or a double-ended wrench of 13 mm × 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: 120~150kgf/cm
①
④
Bolt Tightening Procedure of
NKE-1125/1129 Cover
③
③
⑥
②
Bolt Tightening Procedure of
8-6
8.3 Maintenance on Each Unit
8-M8(stainless steel) bolt
Tightening torque: 120~150kgf/cm
⑦ ①
② ⑧
NKE-1130/1139 Cover
⑤
④
8 8 8