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22 MP-Series Low-inertia Servo Motor with 100 mm to 165 mm Frame Size
Remove and Install a Shaft Key
Shaft keys are constructed of steel. The specified tolerance provides an interference fit (slightly
larger than the opening) for a secure and rigid connection.
ATTENTION: Do not strike the motor's shaft, couplings, or pulleys with tools during installation or
removal of the shaft key.
Damage can occur to the motor bearings and the feedback device if a sharp impact is applied to the
shaft during installation of couplings and pulleys, or to remove the shaft key, or if leverage is applied
from the motor mounting face to remove devices mounted on the motor shaft.
Apply a constant pressure, with a wheel puller, to the user end of the shaft to remove a friction fit or
stuck device.
To remove a shaft key, perform one of these actions:
•
Lift the key by grasping it with a pliers or similar tool.
•
Lever the key with a screwdriver inserted between the key and the slot.
To install a shaft key, follow these steps.
1. Verify the replacement key matches the keyway in the shaft and the mating mechanical
connection (for example, a coupling or pulley) before proceeding.
2. Align the front of the key with the front of the motor shaft.
This prevents the radiused end-of-cut at the motor end of the keyway from interfering
with correct seating of the key.
Support the underside of the shaft diameter with a fixture, and use a controlled press device to
apply a constant force across the top surface to press the key into the shaft.
Rockwell Automation Publication MP-IN001I-EN-P - January 2015
Apply a constant force
evenly across the top of the key.
Key Aligns at
End of Shaft
Support Fixture
Radius Cut at
the End of the
Keyway
for Shaft
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