JRC JMA-2353, Instruction Manual

Page: 151 / 210

Chapter 4 MAINTENANCE
4.2 MAINTENANCE ON EACH UNIT
4-3
4
INSTRUCTION MANUAL

Precautions in Mounting the Cover (NKE-2063)
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:

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.

Use an offset wrench of 11 mm × 13 mm or a double-ended wrench of 13 mm × 17
mm (not longer than 200 mm).
 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.

Radiator
Note:

If the radiator front face (radiation plane) is soiled with smoke, salt, dust, paint or
birds’ droppings, wipe it with a piece of soft cloth wetted with alcohol or water
and try to keep it clean at all times. Otherwise, radar beam radiation may
attenuate or reflect on it, resulting in deterioration of radar performance.

Never use solvents of gasoline, benzine, trichloroethylene and ketone for
cleaning.
Otherwise, the radiation plane may deteriorate.
Check up and clean the radiator.
①
②
③ ④
NKE-2063 Cover Bolt
Tightening Procedure
4-M8 (stainless steel) bolt
Tightening torque: 120 to 150 kgf  cm