The Chelsea 660ZFDAX-A3XD or 660ZFDAXA3XD is a 660 Series Power Take-Off Assembly designed for medium to heavy-duty truck applications. This PTO mounts via a 6-bolt pattern and uses wire/cable mechanical shift engagement. The 1-1/4" round output shaft (with key) is compatible with Eaton/Fuller, Volvo/Mack, Hino, and other transmission families. The 660 Series carries an intermittent torque rating up to 375 lb-ft (508 Nm), with shaft power delivery of 36 HP at 500 RPM, 71 HP at 1,000 RPM, and 107 HP at 1,500 RPM. The cast iron housing and tapered cone bearings on the output shaft contribute to the series' load capacity and service life. Call us to confirm proper fit for your transmission and application.

The Chelsea 660 Series is built for vocational and municipal equipment, aerial devices, dump trucks, service trucks, and snow and ice removal applications. Twenty-six output options and four internal speed ratios give this series broad versatility across medium- and heavy-duty hydraulic pump configurations.
Features
6-bolt mounting pattern fits most popular manual transmissions from Eaton/Fuller, Volvo/Mack, Hino, and others
1-1/4" round output shaft with key
Wire/cable mechanical shift engagement
Intermittent torque rating up to 375 lb-ft (508 Nm); continuous operation available with 30% de-rating
Shaft power: 36 HP at 500 RPM, 71 HP at 1,000 RPM, 107 HP at 1,500 RPM
One-piece gears, cast iron bearing caps, and greaseable shaft options
Tech Specs
- Mounting Type: 6-Bolt
- Shift Type: Wire/Cable, Mechanical
- Output Shaft Type: 1-1/4" Round, 1-1/4" Round with Key
- Intermittent Torque: 375 lb-ft / 508 Nm (Check Application Pages for Actual Torque Ratings)
- Output Power: 56+ HP / 51+ kW
- Shaft Power: 36 HP (500 RPM), 71 HP (1,000 RPM), 107 HP (1,500 RPM) / 27 kW (500 RPM), 53 kW (1,000 RPM), 80 kW (1,500 RPM)
- Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Hino, Other
- Continuous Operation: Yes, with 30% de-rating
Additional Information

The Chelsea 660 Series is built for vocational and municipal equipment, aerial devices, dump trucks, service trucks, and snow and ice removal applications. Twenty-six output options and four internal speed ratios give this series broad versatility across medium- and heavy-duty hydraulic pump configurations.
