The Chelsea 892 Series Power Take-Off, part number 892HFFJW-B5AZ or 892HFFJWB5AZ, is a hydraulic hot-shift PTO engineered specifically for Allison 4700 Series transmissions. The 892 Series mounts via a 10-bolt pattern and positions the pump mounting flange at the rear of the transmission, improving clearance where frame rails are tight. Output is SAE C flange with a wet spline shaft, extending service life under continuous-duty demands. The unit is a single piece with a one-piece main shaft, eliminating input splines between the PTO body and output extension. Typical applications include aerial trucks, fire and rescue, refuse, and truck cranes. Call us to confirm this part number is the right fit for your transmission configuration.
Features
Hydraulic hot-shift operation for Allison 4700 Series transmissions
10-bolt transmission mounting with rear-mounted pump flange for improved clearance
SAE C output flange and shaft type
Wet spline output extends PTO and pump shaft life in demanding duty cycles
One-piece main shaft design eliminates input splines between PTO body and output extension
Suited for aerial, fire and rescue, refuse, and truck crane applications
Tech Specs
- Series: Chelsea 892
- Application: Allison 4700 Series transmissions
- Shift Type: Hydraulic hot-shift
- Mounting Type: 10-bolt
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C, wet spline
- Input Gear Designator: FJ - Allison 3000 MD and 4000 HD Series
- Lubricant/Output: Wet spline (W)
- Intermittent Torque Rating: 501+ lb-ft (series level)
- Output Power: 56+ HP (series level)
Additional Information
The 892 Series fits between the transmission and frame rail, with the clutch positioned at the rear of the PTO housing so the gear section stays tight to the transmission. This layout provides clearance for larger hydraulic pumps without requiring a separate extension unit. The series can be ordered for transmissions equipped with or without a cooler, retarder, or both. Common vehicle applications include aerial work platforms, pumper cleaners, fire and rescue apparatus, refuse trucks, and truck cranes. Part number 892HFFJW-B5AZ is also referenced as SP892HFFJW-B5AZ in some catalog systems.Parts Manual: Chelsea 892 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
