Yamaha NAVIGO Owner's Manual page 93

„ Attach the cap to prevent dirt or water from
entering the connector.
… Place the wheelchair so that it will not become unstable
when the power units are removed. (For example, as
shown in the figure.)
 Release the parking brakes.
 While holding the hub with both hands and pushing the
middle of the center cap "a" with your fingers, pull out each
power unit using both hands.
(2) Installing the power units to the frame
 Place the wheelchair so that it will not become unstable.
(For example, as shown in the figure.)
‚ Switch the clutches on the units to the power drive
position.
ƒ While pushing the middle of the center cap "a" with your
fingers, install each power unit using both hands so that
the torque stopper axle "b" fits into the torque-receiving
component.
Cap
Connector
a
11
a
b
87