JRC JMR-92 Series Field Service Manual page 291

Step 2 Remove the motor.
Remove the covers on the both sides, and remove the cables that connect the motor driver
circuit board in the left (port) side to the motor. Remove the hexagonal bolts on the right and left
sides that hold the motor in position (four bolts: M10 x 40, SW10, W10), and then remove it.
Remove the hexagonal screws.
Motor driver circuit board
Disconnect the two cables.
Port side
Remove the hexagonal screws.
Starboard side
4-71 Chapter 4 Replacement procedure