680QFMEX-56XD Chelsea Power Take-Off

The Chelsea 680QFMEX-56XD is an 8-bolt Power Take-Off from the 680 Series, a medium- to heavy-duty PTO built around an iron housing with tapered cone bearings on the output shaft. The 680 Series supports Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other manual transmission applications with 8-bolt PTO apertures, including a deep-mount housing option for Mack. Output power for the series reaches 56+ HP, with shift via wire/cable or mechanical actuation. Output options span SAE A, SAE B, and other pump flange configurations as well as driveline setups. Pro Gear and Transmission carries this genuine Chelsea unit.

Features

8-bolt mounting for compatibility with common medium- and heavy-duty manual transmission apertures
Cast iron housing with tapered cone bearings on the output shaft for load capacity and service life
56+ HP (51+ kW) output power rating for the 680 Series
Intermittent torque range of 301-400 lb-ft for the series; continuous operation with 30% de-rating
Wire/cable or mechanical shift actuation options
SAE A, SAE B, ISO 7652 pump flange, and driveline output configurations available in the 680 Series

Tech Specs

• Mounting Type: 8-Bolt
• Shift Type: Wire/Cable or Mechanical
• Output Power (Series): 56+ HP (51+ kW)
• Shaft Power: 36 HP at 500 RPM, 71 HP at 1000 RPM, 107 HP at 1500 RPM
• Intermittent Torque (Series): 301-400 lb-ft (375 lb-ft reference; check application pages for actual rating)
• Continuous Operation: Yes, with 30% de-rating
• Output Type Options: SAE A Pump Flange, SAE B Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Type Options: SAE A 5/8"-9T, SAE B 7/8"-13T, SAE BB 1"-15T, SAE C 1-1/4"-14T, DIN 5462 Pump Spline, Round Shaft 1-1/4" with 5/16" Key, 1410 Companion Flange
• Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Daimler/Detroit, Other (8-bolt aperture)
• Lubricant: X = No Pressure Lube (per part number decode)
• Housing: Cast iron

Additional Information

The Chelsea 680 Series is suited for higher-torque vocational applications including pneumatic blowers, aerial lifts, dump trucks, refuse vehicles, fire and rescue equipment, and snow and ice removal. The space-saving air shift cover is designed for maximum under-truck clearance. The series offers thirty-two output options, including a 360-degree rotatable flange, and four internal speed ratios.
Reference documents for this series include the 680 Series Parts List (HY25-2660-M1_US), 680 Series Sales Literature, the 340/348/442/447/489/660/680/823/863/880 Series Owner's Manual, 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.