VDG TM100B25 - Manual Release Backstop (MRB) Device Operation; Releasing the MRB Feature; Engaging the MRB Feature

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Releasing & Engaging a Drum Motor
Equipped with a Manual Release Backstop (MRB) Device
NOTE: The drum motor is shipped with the Backstop device engaged.
To Release the Backstop Feature:
1. Bring the drum motor to full stop and disconnect power.
2. Remove the shaft cap located on the shaft end, opposite the junction
box or cable entry.
3. Using a 10mm deep socket 1/4” drive and a ratchet; insert socket into
the shaft and turn clockwise until the end, approximately 15 turns and
allow motor to rotate freely in opposite direction.
4. Remove socket and re-install the shaft cap.
The motor will operate in both directions.
To Engage the Backstop Feature - Repeat Steps 1 & 2:
3. Using a 10mm deep socket 1/4” drive and a ratchet; insert socket into
the shaft and turn counter clockwise, approximately 15 turns.
NOTE: Do not exert force to turn the socket as some movement for
the drum may be necessary to align the shaft to engage to its mating
part. Forcing the rotation of the socket may result in damage to inter-
nal components.
4. Once re-engaged, remove the socket and re-install the shaft cap.
The motor will operate in only the direction indicated by the brass
arrow mounted on the side of the unit.
If you require assistance, contact VDG (Van der Graaf) Technical Support:
1 (866) 595-3292 or email: service@vandergraaf.com