The Chelsea 680DFMAX-56RK or 680DFMAX56RK is a medium-to-heavy duty Power Take-Off from the Chelsea 680 Series, designed for 8-bolt PTO aperture transmissions including Eaton/Fuller and Mack applications. The 680 Series features a cast iron housing with tapered cone bearings on the output shaft for strong torque capacity in demanding applications such as pneumatic blowers, aerial equipment, and dump truck service. The series carries an intermittent torque range of 301 to 400 lb-ft and supports continuous operation with a 30% de-rating. Output power reaches 56+ HP. The space-saving shift cover helps maintain clearance under the truck. Call us to confirm proper fit for your transmission and output configuration.
Features
8-bolt mounting for Eaton/Fuller, Mack, Daimler/Detroit, and other compatible manual transmissions
Cast iron housing with tapered cone bearings on the output shaft for high torque capacity
Intermittent torque rating: 301 to 400 lb-ft (501+ Nm); continuous operation supported with 30% de-rating
Output power: 56+ HP (51+ kW); shaft power rated at 71 HP at 1,000 RPM for the 680 Series
Deep mount housing option available for Mack transmission applications
Designed for higher-torque vocational uses including pneumatic blowers, aerial equipment, and refuse trucks
Tech Specs
- Mounting Type: 8-Bolt
- Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Daimler/Detroit
- Intermittent Torque: 301 to 400 lb-ft (501+ Nm)
- Continuous Operation: Yes, with 30% de-rating
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 36 HP at 500 RPM, 71 HP at 1,000 RPM, 107 HP at 1,500 RPM
- Shift Type: Wire/Cable or Mechanical
- Housing Material: Cast Iron
- Output Shaft Bearing Type: Tapered Cone Bearings
Additional Information
The Chelsea 680 Series supports 32 output options, four internal speed ratios, and ten shift configurations, making it adaptable across a wide range of vocational equipment installations. A 360-degree rotatable flange option is available within the series for flexible pump fitment. Common applications for the 680 Series include aerial work platforms, snow and ice removal equipment, fire and rescue vehicles, dump trucks, service trucks, refuse equipment, and blower and product pump systems. Part number 680DFMAX-56RK is also referenced as SP680DFMAX-56RK in some distributor catalogs.Parts Manual: Chelsea 680 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
