Maintenance
Preventive Maintenance
368 MagneMotion
Rockwell Automation Publication MMI-UM002F-EN-P - October 2022
Figure 7-10: Precision Rail Vehicle Bearing Adjustment
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, rotate one or
both bearings closer to the rails until the movement is minimized. If the vehicle does not move
easily along the rails, rotate one or both bearings further away from the rails until there is free
movement without any rocking.
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 7-2. See the cut-away
view shown in Figure 7-10, 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 7-11.
Table 7-2: Precision Rail Vehicle Drag
Vehicle Type Maximum Drag
Single Array 2.80 N [10.1 ozf]
Dual Array 5.86 N [21.1 ozf]
Eccentric
Bearing
Bearing Nut
Motor Side of Vehicle
Concentric
Bearing
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