The Chelsea 852 Series Power Take-Off Assembly, part number 852XGAKP-B4XV or 852XGAKPB4XV, is a Hydraulic PowerShift PTO built for Allison automatic transmissions with 8-bolt PTO mounting apertures. The output shaft is a 1-1/2"-10T spline with a 1410 series companion flange. The 852 Series carries an intermittent torque rating up to 500 lb-ft (678 Nm) - check application pages for actual torque ratings for your specific configuration. Shaft power output is rated at 48 HP at 500 RPM and 95 HP at 1000 RPM. Pressure lubrication is standard, and the series supports three internal speed ratios. Continuous operation is supported with a 30% de-rating. Common applications include bulk transporter trucks, oil field equipment, and fire and rescue vehicles. A genuine Chelsea part from Pro Gear and Transmission. Call us to confirm proper fit for your application.

The Chelsea 852 Series is suited for demanding vocational markets including oil and gas, mobile equipment, and municipal applications. Typical vehicle applications include bulk transporter trucks, oil field equipment, and fire and rescue vehicles. Three internal speed ratios and three output options make this series adaptable across a range of hydraulic system configurations. Parker Chelsea documents available for this series include the 272/282/852/885 Series Owner's Manual and the 852 Series Parts List (HY25-2852-M1_US).
Features
Hydraulic PowerShift (PowerShift) shift type for Allison 8-bolt automatic transmissions
8-bolt mounting configuration
1-1/2"-10T spline output shaft with 1410 series companion flange
Intermittent torque up to 500 lb-ft / 678 Nm (check application pages for actual ratings)
Shaft power: 48 HP at 500 RPM, 95 HP at 1000 RPM
Three internal speed ratios available; pressure lubrication standard
Supports continuous operation with 30% de-rating
Tech Specs
- Transmission Manufacturer: Allison
- Mounting Type: 8-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: 1-1/2"-10T Spline with 1410 Series Companion Flange
- Intermittent Torque: Up to 500 lb-ft / 678 Nm (Check Application Pages for Actual Torque Ratings)
- Output Power: 56+ HP / 51+ kW
- Shaft Power: 48 HP (500 RPM), 95 HP (1000 RPM) / 36 kW (500 RPM), 71 kW (1000 RPM)
- Continuous Operation: Yes, with 30% de-rating
- Lubrication: Pressure lubrication standard
Additional Information

The Chelsea 852 Series is suited for demanding vocational markets including oil and gas, mobile equipment, and municipal applications. Typical vehicle applications include bulk transporter trucks, oil field equipment, and fire and rescue vehicles. Three internal speed ratios and three output options make this series adaptable across a range of hydraulic system configurations. Parker Chelsea documents available for this series include the 272/282/852/885 Series Owner's Manual and the 852 Series Parts List (HY25-2852-M1_US).