The Chelsea 890 Series Power Take-Off, part number 890PBFJW-B5AZ or 890PBFJWB5AZ, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It uses a 10-bolt mounting configuration and positions the pump output flange to the rear of the transmission, creating clearance where side-mount PTOs fall short. The SAE C output shaft uses Wet Spline technology to extend PTO and pump shaft life under demanding duty cycles. Continuous torque rating reaches 670 lb-ft, with intermittent torque rated at 501+ lb-ft. Shaft power is rated at 64 HP at 500 RPM and 128 HP at 1,000 RPM. A one-piece main shaft eliminates the input splines found in PTO-plus-extension arrangements. Typical applications include aerial trucks, fire and rescue vehicles, truck cranes, and refuse trucks. Call us to confirm proper fit for your specific Allison transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") output shaft with Wet Spline technology for extended pump shaft life
Continuous torque rating up to 670 lb-ft; intermittent torque rated at 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design eliminates input splines between PTO and output extension
Tech Specs
- Transmission Fitment: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C ("XS") Wet Spline
- Continuous Torque Rating: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque Rating: 501+ lb-ft
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Lubrication: Wet Spline
Additional Information
The Chelsea 890 Series is engineered as a single-unit PTO, not a PTO with a bolt-on extension. The clutch is located at the rear of the housing, allowing the gear section to mount tightly against the transmission while still providing clearance between the pump and the frame rail. This design suits applications where space is constrained, such as aerial trucks, fire and rescue trucks, snow and ice units, and refuse trucks. The 890 Series can be specified for transmissions equipped with a cooler, a retarder, both, or neither. Part number 890PBFJW-B5AZ is also referenced as SP890PBFJW-B5AZ. Contact Pro Gear and Transmission to confirm the correct PTO configuration for your truck's transmission and pump setup.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
