JRC JMA-5212-4, User Manual

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Step 4: Replace the motor.
The motor is fixed with 4 hexagon bolts (M8 x
20 SW W, embedded type).
Remove all the hexagon bolts (4 pieces).
Remove the motor.
The motor weighs about 6 kg.
Handle it carefully.
Attach the mounting plate to the new motor.
Remove the motor mounting plate from the
removed motor. The mounting plate is fixed
with 4 hexagon bolts (M8 x 30 SW W,
embedded type).
Attach the removed parts to the new motor.
Make sure to properly tighten all the hexagon
bolts at the optimal torque (210 kgf·cm).
Place the motor in the antenna.
Press the motor against the protrusions from
the arms of the case, and adjust its position to
minimize the backlash.
Make sure to properly tighten all the hexagon
bolts at the optimal torque (140 kgf·cm).
Apply grease to the gear after placing the
motor in the case.
Motor
Hexagon bolts
(4 places)
Protrusions for adjusting
the motor position
Hexagon bolts (4 places)
Torque wrench (140 kgf · cm)
Hexagon bolts (4 places)
Torque wrench (210 kgf · cm)
Motor
Motor mounting
plate