The Chelsea 680 Series Power Take-Off, part number 680GFAHX-A3XK or 680GFAHXA3XK, is an 8-bolt mounted PTO designed for medium to heavy duty manual transmission applications on Eaton/Fuller and Volvo/Mack platforms. It shifts via wire/cable mechanical actuation and delivers an output shaft type of 1-1/4" round with key. Intermittent torque capacity runs 375 lb-ft (508 Nm), confirm actual ratings on the application pages for your specific setup. Shaft power output scales from 36 HP at 500 RPM up to 107 HP at 1500 RPM. The 680 Series features a cast iron housing with tapered cone bearings on the output shaft, making it well suited for higher-torque demands like pneumatic blowers, dump trucks, and aerial equipment. A genuine Chelsea part, available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
8-Bolt mounting for broad manual transmission coverage including Eaton/Fuller and Volvo/Mack applications
Wire/cable mechanical shift actuation
1-1/4" round output shaft with key
Intermittent torque rating of 375 lb-ft (508 Nm), verify actual rating on application pages
Shaft power: 36 HP at 500 RPM, 71 HP at 1000 RPM, 107 HP at 1500 RPM
Cast iron housing with tapered cone bearings on the output shaft for extended service life in high-torque duty cycles
Tech Specs
- Intermittent Torque: 375 lb-ft / 508 Nm (check application pages for actual torque ratings for your specific installation)
- Shift Type: Wire/Cable, Mechanical
- Output Power: 56+ HP / 51+ kW
- Output Shaft Type: 1-1/4" Round with Key
- Mounting Type: 8-Bolt
- Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Other
- 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)
- Continuous Operation: Yes, with 30% de-rating
Additional Information
The Chelsea 680 Series is built around a cast iron housing with tapered bearings on both the input shaft and output shaft, replacing needle bearings for greater load-bearing capability under sustained torque. The 680 was specifically engineered for higher-torque vocational applications including pneumatic blowers, aerial equipment, snow and ice removal, fire and rescue, refuse, dump trucks, and service trucks. A deep mount housing option is available within the series for Mack transmission applications. The series offers 32 output configurations, including Chelsea's 360-degree rotatable flange, along with four internal speed ratios and ten shift options. Parker Chelsea documents covering this series include the 680 Series Owner's Manual, 680 Series Parts List (HY25-2660-M1_US), and the Chelsea PTO General Information Catalog.Parts Manual: Chelsea 680 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
