IAI America RCA2-SD4N - Manual (Page 17)

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6. For Short Type (RP*N/RN*N), do not attempt to operate the rod back and forth
without the guide.
Operating back and forth from the rod side without the guide would apply unbalanced load to the
feed screw shaft, which may result in a bend of the screw shaft or damage to the internal
mechanism.
Warning : Do not attempt to move the rod back and forth only with the actuator itself.
Unbalanced load onto the feed screw may damage the actuator.
7. Even after attaching the guide, do not move back and forth from the load side
for the low lead types (Lead 1 and 2mm).
The low lead type actuator has a high resistance to the operation from the rod side. Moving it
forcefully would apply too much load to the feed screw and may result in the cause of operational
failure or destruction of the product. Twist the rotation shaft with a screwdriver from the back side to
move the actuator.
Caution : Do not move back and forth from the load side for the low lead types (Lead 1 and 2).
Moving it forcefully would apply too much load to the feed screw and may result in
the cause of operational failure or destruction of the product.