The Chelsea 680QHMEX-66XD is an 8-bolt Power Take-Off from the Chelsea 680 Series, built around a cast iron housing with tapered cone bearings on the output shaft for extended service life in demanding torque applications. The 680 Series carries an intermittent torque rating of 375 lb-ft (508 Nm) and delivers output power of 56+ HP, making it a proven choice for pneumatic blowers, aerial, refuse, dump truck, and fire and rescue equipment. The series is compatible with Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other manual transmissions featuring an 8-bolt PTO aperture, with a deep mount housing option available for Mack applications. Output configurations span SAE A, SAE B, and driveline options, with wire/cable or mechanical shift. A genuine Chelsea part from Pro Gear and Transmission.
Features
8-bolt mounting for most manual transmissions with 8-bolt PTO apertures
Cast iron housing with tapered cone bearings on the output shaft
Intermittent torque rating: 375 lb-ft (508 Nm)
Output power: 56+ HP (51+ kW); continuous operation supported with 30% de-rating
Compatible with Eaton/Fuller, Volvo/Mack, Daimler/Detroit transmissions
Wire/cable or mechanical shift; SAE A, SAE B, ISO 7652, and driveline output options
Tech Specs
- Mounting Type: 8-Bolt
- Intermittent Torque: 375 lb-ft (508 Nm) - check application pages for actual torque ratings
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 36 HP at 500 RPM, 71 HP at 1000 RPM, 107 HP at 1500 RPM
- Continuous Operation: Yes, with 30% de-rating
- Shift Type: Wire/Cable or Mechanical
- Output Types: SAE A Pump Flange, SAE B Pump Flange, ISO 7652 Pump Flange, Driveline
- Output Shaft Options: Round Shaft (1-1/4 in. - 5/16 in. Key), SAE A (5/8 in. - 9T) Pump Spline, SAE B (7/8 in. - 13T) Pump Spline, SAE BB (1 in. - 15T) Pump Spline, SAE C (1-1/4 in. - 14T) Pump Spline, 1410 Companion Flange
- Housing: Cast Iron
- Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Daimler/Detroit, Other 8-bolt aperture manuals
- Lubrication: X = No Pressure Lube (per part number suffix)
- Dimensions (H x W x L): 8.5 in. x 10.75 in. x 14.5 in.
Additional Information
Parts Manual: Chelsea 680 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
