The Chelsea 680QHMEX-56XD is an 8-bolt Power Take-Off from Chelsea's 680 Series, engineered for medium to heavy-duty manual transmission applications. The cast iron housing and tapered cone bearings on the output shaft deliver a high intermittent torque rating of up to 375 lb-ft (508 Nm), with continuous operation available at a 30% de-rating. Output power reaches 56+ HP (51+ kW), with shaft power scaling from 36 HP at 500 RPM to 107 HP at 1500 RPM. The 680 Series covers Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other transmissions with 8-bolt PTO apertures, including a deep mount housing option for Mack applications. Available output types include SAE A, SAE B, and ISO 7652 pump flanges, as well as driveline configurations. Shift options are wire/cable or mechanical. Pro Gear and Transmission carries this genuine Chelsea part.
Features
8-bolt mounting for most manual transmission applications with 8-bolt PTO apertures
Cast iron housing with tapered cone bearings on the output and input shafts
Intermittent torque rating: up to 375 lb-ft (508 Nm); continuous operation with 30% de-rating
Output power: 56+ HP (51+ kW); shaft power 36 HP at 500 RPM, 71 HP at 1000 RPM, 107 HP at 1500 RPM
Multiple output options: SAE A, SAE B, ISO 7652 pump flanges, and driveline
Wire/cable or mechanical shift; deep mount housing option available for Mack transmissions
Tech Specs
- Mounting Type: 8-Bolt
- Shift Type: Wire/Cable or Mechanical
- Output Type: SAE A Pump Flange, SAE B Pump Flange, ISO 7652 Pump Flange, Driveline
- Intermittent Torque: Up to 375 lb-ft (508 Nm) -- see application pages for actual rating
- Continuous Operation: Yes, with 30% de-rating
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 36 HP at 500 RPM / 71 HP at 1000 RPM / 107 HP at 1500 RPM
- Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other 8-bolt aperture transmissions
- Lubricant: X = No Pressure Lube
- Housing Material: Cast Iron
Additional Information
The Chelsea 680 Series is commonly specified for higher-torque vocational applications including pneumatic blowers, aerial equipment, dump trucks, refuse vehicles, fire and rescue units, and snow and ice removal. The space-saving air shift cover is designed to maximize clearance under the truck. The 680 Series features Chelsea's 360-degree rotatable flange output option among its 32 available output configurations and four internal speed ratios, giving this PTO broad flexibility across pump and driveline setups.Parts Manual: Chelsea 680 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
