The Chelsea 680 Series Power Take-Off, part number 680XFAHX-A3XD or 680XFAHXA3XD, is a cast iron 8-bolt PTO built for medium to heavy-duty manual transmission applications. It uses a wire/cable mechanical shift and delivers a 1-1/4" round output shaft with key. Intermittent torque ratings reach 375 lb-ft (508 Nm) - verify actual torque on the Chelsea application pages for your specific install. Shaft power output runs 36 HP at 500 RPM, 71 HP at 1000 RPM, and 107 HP at 1500 RPM. The deep-mount housing option suits Mack transmission applications, and the unit fits Eaton/Fuller and Volvo/Mack 8-bolt PTO openings. Common duty cycles include pneumatic blowers, dump trucks, and refuse equipment. Call us to confirm proper fit for your transmission and application.

• Intermittent Torque: 301-400 lb-ft / 501+ Nm; rated 375 lb-ft (508 Nm) - check application pages for actual torque rating
• Shift Type: Wire/Cable, Mechanical
• Output Power: 56+ HP (51+ kW)
• Transmission Manufacturer Compatibility: Eaton/Fuller, Volvo/Mack, Other
• Output Shaft Type: 1-1/4" Round with Key
• Mounting Type: 8-Bolt
• Shaft Power: 36 HP (27 kW) at 500 RPM; 71 HP (53 kW) at 1000 RPM; 107 HP (80 kW) at 1500 RPM

The Chelsea 680 Series is built around a cast iron housing with tapered cone bearings on both the output shaft and input shaft, replacing the needle bearings found in lighter-duty units. This design supports higher radial loads and suits demanding vocational cycles such as pneumatic blowers, aerial equipment, snow and ice removal, fire and rescue, refuse, and dump truck service. The 680 Series supports continuous operation with a 30% de-rating applied. The air shift cover is space-saving by design to maximize clearance under the truck cab. Output options for the 680 Series include SAE A, SAE B, ISO 7652, and driveline configurations, with Chelsea's 360-degree rotatable flange available for pump fitment flexibility. Four internal speed ratios and ten shift options are available across the series. Confirm the specific ratio and output configuration for part number 680XFAHX-A3XD on the Chelsea application pages or call Pro Gear and Transmission to verify fit.