680GRAHX-A3RA Chelsea 680 Series PTO

The Chelsea 680GRAHX-A3RA or 680GRAHXA3RA is an 8-bolt power take-off from the Chelsea 680 Series, built for medium- to heavy-duty manual transmission applications. The 680 Series is engineered for higher torque demands, with an intermittent torque rating of up to 375 lb-ft (508 Nm) and output shaft power reaching 71 HP at 1,000 RPM. Its cast iron housing and tapered cone bearings on the output shaft contribute to a long service life under demanding conditions. The 680 Series shift type includes wire/cable and mechanical options, and output configurations span SAE A, SAE B, SAE BB, and SAE C pump flanges as well as driveline outputs. Continuous operation is supported with a 30% de-rating. Call us to confirm proper fit for your specific transmission and application.

Features

Chelsea 680 Series, 8-bolt mounting for manual transmission applications including Eaton/Fuller, Volvo/Mack, and Daimler/Detroit
Cast iron housing with tapered cone bearings on the output shaft for durability under high torque loads
Intermittent torque rating up to 375 lb-ft (508 Nm); continuous operation supported with 30% de-rating
Output shaft power: 36 HP at 500 RPM, 71 HP at 1,000 RPM, 107 HP at 1,500 RPM
Multiple output configurations available including SAE A, SAE B, SAE BB, SAE C pump flanges, ISO 7652 pump flange, and driveline
Designed for high-torque vocational uses such as pneumatic blowers, dump trucks, refuse, aerial, and fire and rescue applications

Tech Specs

• Mounting Type: 8-Bolt
• Shift Type: Wire/Cable, Mechanical
• Intermittent Torque: Up to 375 lb-ft (508 Nm) - check application pages for actual torque ratings
• Continuous Operation: Yes, with 30% de-rating
• Output Shaft Power: 36 HP (500 RPM), 71 HP (1,000 RPM), 107 HP (1,500 RPM)
• Output Types: SAE A Pump Flange, SAE B Pump Flange, SAE BB Pump Flange, SAE C Pump Flange, ISO 7652 Pump Flange, Driveline
• Output Shaft Types: Round Shaft (1-1/4" - 5/16" Key), SAE A (5/8" - 9T) Pump Spline, SAE B (7/8" - 13T) Pump Spline, SAE BB (1" - 15T) Pump Spline, SAE C (1-1/4" - 14T) Pump Spline, 1410 Companion Flange
• Lubricant System: No Pressure Lube (X designation)
• Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Daimler/Detroit
• Housing Material: Cast Iron

Additional Information

The Chelsea 680 Series is covered by Parker documentation including 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 dedicated Detroit DT12 Adapter Owner's Manual is available for the 680 Series. Typical vocational applications include aerial equipment, snow and ice removal, fire and rescue, dump trucks, refuse vehicles, service trucks, and blower and product pumps. The 680 Series deep mount housing option supports Mack transmission installations. Four internal speed ratios and up to thirty-two output configurations are available across the 680 Series platform. Contact Pro Gear and Transmission to confirm the correct configuration for your specific chassis and transmission.

Parts Manual: Chelsea 680 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.