The Chelsea 680GRAHX-A3GK is a 680 Series Power Take-Off built for medium to heavy duty manual transmission applications with 8-bolt PTO apertures, including Eaton Fuller and Mack transmissions. The 680 Series features a cast iron housing with tapered cone bearings on both the input and output shafts for strong load-bearing capability under high-torque conditions. Intermittent torque capacity for the 680 Series reaches 375 lb-ft (508 Nm), and the unit supports continuous operation with a 30% de-rating. Shift options include wire/cable and mechanical actuation. Common vocational applications include aerial, dump truck, refuse, snow and ice removal, fire and rescue, and pneumatic blower service. Call us to confirm proper fit for your transmission and output configuration.
Features
Chelsea 680 Series PTO, part number 680GRAHX-A3GK or 680GRAHXA3GK
8-bolt mounting fits most manual transmissions including Eaton Fuller and Mack applications
Cast iron housing with tapered cone bearings on input and output shafts
375 lb-ft (508 Nm) intermittent torque rating for the 680 Series; continuous operation supported with 30% de-rating
Wire/cable and mechanical shift options available across the 680 Series
Suited for aerial, dump truck, refuse, fire and rescue, snow and ice, and pneumatic blower service
Tech Specs
- Mounting Type: 8-Bolt
- Shift Type: Wire/Cable, Mechanical
- Intermittent Torque (Series): 375 lb-ft (508 Nm) - check application pages for actual torque rating
- Continuous Operation: Yes, with 30% de-rating
- Output Power (Series): 56+ HP (42+ kW)
- Shaft Power: 36 HP at 500 RPM, 71 HP at 1000 RPM, 107 HP at 1500 RPM
- Output Options: SAE A Pump Flange, SAE B Pump Flange, ISO 7652 Pump Flange, Driveline
- Housing: Cast iron
- Lubricant Type: X = No Pressure Lube (per part number suffix)
- Transmission Compatibility (Series): Eaton/Fuller, Volvo/Mack, Daimler/Detroit
- Dimensions (H x W x L): 8 in. x 10 in. x 14 in.
Additional Information
The Chelsea 680 Series is documented in the 680 Series Parts List (HY25-2660-M1_US) and the 340/348/442/447/489/660/680/823/863/880 Series Owner's Manual. A Detroit DT12 Adapter Owner's Manual covers 680 Series fitment on Detroit DT12 transmissions. Additional ratio and output options are detailed in Parker bulletin PTO-PNI-250. Not sure this is the right PTO for your application? Give us a call and we can help confirm the correct part for your transmission and output setup.Parts manual and diagrams: Chelsea 680 Series PTO parts list with prices
