The Chelsea 852XJAKP-B6XS or 852XJAKPB6XS is an 852 Series Hydraulic PowerShift Power Take-Off built for Allison automatic transmissions with 8-bolt PTO mounting apertures. The 852 Series features a cast iron housing and heavy-duty ball bearings on the output shaft, paired with a large clutch pack rated up to 500 lb-ft intermittent torque (check application pages for actual torque ratings). Output is through a 1410 companion flange on a 1-1/2"-10T spline shaft. Shaft power reaches 95 HP at 1000 RPM. The series offers three internal speed ratios and includes pressure lubrication as standard. Typical applications include bulk transporter trucks, oil field equipment, and fire and rescue vehicles. A genuine Chelsea part, available at Pro Gear and Transmission. Call us to confirm proper fit for your specific Allison transmission application.

The Chelsea 852 Series is suited for demanding vocational markets including oil and gas, mobile equipment, and municipal applications. Typical platforms include bulk transporter trucks, oil field equipment, and fire and rescue vehicles. The 852 Series is compatible with Parker Chelsea documents: 852 Series Parts List (HY25-2852-M1_US) and the 272/282/852/885 Series Owner's Manual, available through Parker Chelsea.
Features
Fits Allison automatic transmissions with 8-bolt PTO mounting apertures
Hydraulic PowerShift (PowerShift hydraulic shift type)
1410 companion flange output on a 1-1/2"-10T spline shaft
Three internal speed ratios available within the 852 Series
Pressure lubrication standard
Shaft power: 48 HP at 500 RPM, 95 HP at 1000 RPM
Tech Specs
- Transmission Manufacturer: Allison
- Mounting Type: 8-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: 1410 Companion Flange, 1-1/2" - 10T Spline
- 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
Additional Information

The Chelsea 852 Series is suited for demanding vocational markets including oil and gas, mobile equipment, and municipal applications. Typical platforms include bulk transporter trucks, oil field equipment, and fire and rescue vehicles. The 852 Series is compatible with Parker Chelsea documents: 852 Series Parts List (HY25-2852-M1_US) and the 272/282/852/885 Series Owner's Manual, available through Parker Chelsea.