The Chelsea 680DFMCX-56RJ is an 8-bolt Power Take-Off from the Chelsea 680 Series, built for medium- to heavy-duty manual transmission applications. The 680 Series features a cast iron housing with tapered cone bearings on the output shaft, designed to handle higher torque demands such as pneumatic blowers. Output power reaches 56+ HP, with shaft power ratings of 36 HP at 500 RPM, 71 HP at 1000 RPM, and 107 HP at 1500 RPM. The series supports Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other transmission manufacturers, including a deep-mount housing option for Mack applications. Available output types include SAE A, SAE B, and ISO 7652 pump flanges, plus driveline. Wire/cable or mechanical shift options are supported. A genuine Chelsea part from Pro Gear and Transmission.
Features
8-bolt mounting for medium- to heavy-duty manual transmission applications
Cast iron housing with tapered cone bearings on the output and input shafts
56+ HP output power; shaft ratings of 36 HP (500 RPM), 71 HP (1000 RPM), 107 HP (1500 RPM)
Compatible with Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other transmissions
Deep-mount housing option available for Mack transmission applications
Output options include SAE A, SAE B, and ISO 7652 pump flanges, plus driveline
Tech Specs
- Mounting Type: 8-Bolt
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 36 HP (500 RPM), 71 HP (1000 RPM), 107 HP (1500 RPM)
- Intermittent Torque: 301-400 lb-ft (501+ Nm); series rating 375 lb-ft (508 Nm) - check application pages for actual torque rating
- Continuous Operation: Yes, with 30% de-rating
- Output Type: SAE A Pump Flange, SAE B Pump Flange, ISO 7652 Pump Flange, Driveline
- Shift Type: Wire/Cable, Mechanical
- Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Daimler/Detroit, Other
- Lubricant: X (No Pressure Lube)
- Housing: Cast Iron
Additional Information
The Chelsea 680 Series is suited for aerial, snow and ice removal, fire and rescue, dump truck and trailer, service truck, refuse, and blower and product pump applications. The space-saving air shift cover is designed to maximize clearance under the truck. The 680 Series supports four internal speed ratios and ten shift options across the product family. The 360-degree rotatable flange option is available within this series for improved pump fitment flexibility. Series documentation includes the 680 Series Owner's Manual, 680 Series Parts List (HY25-2660-M1_US), and the Chelsea Power Take-Off General Information Catalog.Parts Manual: Chelsea 680 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
