Purpose: Slow-roll the driven train to prevent rotor/shaft bow (hogging/sagging) and maintain bearing oil film during shutdown.
Turning Speed (output): typically ~0.1 RPM (often expressed as “one-tenth RPM” class).
Duty: intermittent / long-duration slow rolling (hours to continuous during cooldown) depending on OEM procedure.
Prime mover: electric motor (most common), sometimes hydraulic motor on certain turbine packages.
Typical motor power: ~3–10 HP (5 HP is very common on many turning gear systems).
Motor speed: typically 1800 RPM (4-pole, 60 Hz) or 1500 RPM (50 Hz), depending on site.
Spanish 
English 
Arabic