IAI America RCP4W - Manual (Page 51)

4. Maintenance Inspection
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2) Slide in the terminal caps to attach them.
3) Tighten the four hex socket head cap screws to hold the cover on the side opposite to the motor
(at the circled places) with a hex wrench to attach the cover.
Edge Cap
Tightening Torque : 88.7N•cm
Tool to use: Hex wrench 2.5mm-sized