Maintenance
Preventive Maintenance
50 MagneMotion
Rockwell Automation Publication MMI-UM037A-EN-P - April 2020
Concentric Bearings
Concentric bearings are not adjustable and must be tightened to 19 N•m [14 ft•lb] always.
Once tightened, apply Loctite 290 to the nuts on the top of the carriage and allow the Loctite
to cure for 3 hours at 22° C [72° F] before using the vehicle.
Eccentric Bearings
Eccentric bearings are adjustable, which enables them to be rotated either closer to or further
away from the rail. If the vehicle can be rocked from side to side or front to back, then there is
too much movement and one or both bearings must be readjusted and rotated closer to the rail
until the movement is eliminated. If the vehicle does not move easily along the rails, rotate
one or both bearings further away from the rails.
Adjustments that are made to the eccentric bearings on a vehicle, in relationship to the rail,
dictate how easily the vehicle moves along the rail. When the bearings are adjusted, the drag
force for the vehicle must not exceed the limits that are shown in Table 6. See the cut-away
view shown in Figure 14, to adjust the eccentric bearings on the vehicle. Make sure that the
center of the eccentric bearings is further apart than the center of the concentric bearings as
shown in Figure 15.
Figure 15: Eccentric Bearing Position
Table 6: Precision Rail Vehicle Drag
Vehicle Type Maximum Drag
Single Array 2.80 N [10.1 ozf]
Dual Array 5.86 N [21.1 ozf]
Concentric Bearings
Eccentric Bearings
Concentric Bearing
Centerline
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