The Chelsea 680 Series Power Take-Off 680XQAHX-A5XK or 680XQAHXA5XK is a medium- to heavy-duty PTO built for 8-bolt transmission apertures on Eaton/Fuller and Volvo/Mack applications. The cast iron housing and tapered cone bearings on the output shaft support intermittent torque ratings from 301 to 400 lb-ft (501+ Nm), with a series-rated peak of 375 lb-ft (508 Nm) - check application pages for actual torque ratings for your installation. The 1-1/4" round output shaft (with key) and wire/cable mechanical shift cover deliver shaft power of 36 HP at 500 RPM, 71 HP at 1000 RPM, and 107 HP at 1500 RPM. A deep-mount housing option supports Mack transmission fitment. Designed for pneumatic blowers and similarly demanding drive applications. Call us to confirm proper fit for your transmission.
The Chelsea 680 Series is built around a cast iron housing with tapered cone bearings on both the input and output shafts, replacing the needle bearings common in lighter-duty units. This design increases load-bearing capability and extends service life under sustained high-torque demand. The series offers four internal speed ratios and ten shift options across thirty-two output configurations. Chelsea's 360-degree rotatable flange is available within the series for flexible pump positioning. Typical vocational applications include aerial lifts, dump trucks, refuse bodies, fire and rescue equipment, snow and ice removal systems, and pneumatic blower and product pump drives.
Features
8-bolt mounting for broad manual transmission coverage, including Eaton/Fuller and Volvo/Mack
Wire/cable mechanical shift type
1-1/4" round output shaft with key
Intermittent torque rating 301-400 lb-ft (501+ Nm); series peak 375 lb-ft (508 Nm) - verify against application pages
Shaft power: 36 HP at 500 RPM, 71 HP at 1000 RPM, 107 HP at 1500 RPM
Deep-mount housing option for Mack transmission applications; suited for pneumatic blower drives
Tech Specs
- Intermittent Torque: 301-400 lb-ft (501+ Nm); series-rated 375 lb-ft / 508 Nm (check application pages for actual torque ratings)
- Shift Type: Wire/Cable, Mechanical
- Mounting Type: 8-Bolt
- Output Shaft Type: 1-1/4" Round with Key
- Output Power: 56+ HP, 51+ kW
- Shaft Power: 36 HP (500 RPM), 71 HP (1000 RPM), 107 HP (1500 RPM) / 27 kW (500 RPM), 53 kW (1000 RPM), 80 kW (1500 RPM)
- Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Other 8-bolt manual transmissions
- Continuous Operation: Yes, with 30% de-rating
Additional Information
The Chelsea 680 Series is built around a cast iron housing with tapered cone bearings on both the input and output shafts, replacing the needle bearings common in lighter-duty units. This design increases load-bearing capability and extends service life under sustained high-torque demand. The series offers four internal speed ratios and ten shift options across thirty-two output configurations. Chelsea's 360-degree rotatable flange is available within the series for flexible pump positioning. Typical vocational applications include aerial lifts, dump trucks, refuse bodies, fire and rescue equipment, snow and ice removal systems, and pneumatic blower and product pump drives.
Parts Manual: Chelsea 680 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
