Center: Up to 145 mm and 1750 rpm; 145 mm to 250 mm
Gear-Worm Gear
| Mobil SHC 630 | Temperature Ambient Below : 15°F/-9.52°C |
| Mobil SHC 634 | Temperature Ambient Range : 15°F/-9.52°C - 60°F/15.68°C |
| Mobil SHC 634 | Temperature Ambient Range : 50°F/10.08°C - 125°F/52.08°C |