The Chelsea 892HFFJW-B5XK is a hydraulic hot-shift power take-off from the 892 Series, engineered specifically for Allison 4700 Series transmissions. Its design relocates the PTO and pump mounting flange to the rear of the transmission, creating improved pump clearance between the housing and the frame rail. The unit mounts via a 10-bolt pattern like a standard side-mounted PTO and includes an additional support bracket at the rear of the transmission. Output uses an SAE C flange and shaft, and wet spline technology is built in to extend PTO and pump shaft service life under demanding duty cycles. The 892 Series delivers intermittent torque ratings above 501 lb-ft and output power above 56 HP. Applications include aerial trucks, fire and rescue vehicles, truck cranes, refuse trucks, and snow and ice equipment.
Reference documents: 892 Series Parts List HY25-2892-M1_US; 890/892/897/899 Series Owner's Manual; Chelsea PTO Wet Spline Option guide.
Features
Hydraulic hot-shift operation for Allison 4700 Series transmissions
10-bolt mounting with rear support bracket for a secure, side-mount-style installation
SAE C output flange and shaft
Wet spline output technology extends PTO and pump shaft life in demanding conditions
Extended rear-mounted output locates pump to the rear of the transmission for improved clearance
Intermittent torque rating: 501+ lb-ft; output power: 56+ HP
Tech Specs
- Product Series: 892
- Shift Type: Hydraulic Hot-Shift
- Mounting Type: 10-Bolt
- Output Shaft Type: SAE C
- Outlet Flange Type: SAE C
- Output Power: 56+ HP (51+ kW)
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Lubricant/Spline Type: Wet Spline
- Transmission Fitment: Allison 4700 Series
Additional Information
The 892 Series is a single-unit design with a one-piece main shaft, eliminating the input splines that are present in a PTO-plus-extension arrangement. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit tightly against the transmission for maximum frame clearance. The unit can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Typical service applications include aerial platforms, fire and rescue pumpers, truck cranes, refuse trucks, and snow and ice control equipment.Reference documents: 892 Series Parts List HY25-2892-M1_US; 890/892/897/899 Series Owner's Manual; Chelsea PTO Wet Spline Option guide.
Parts Manual: Chelsea 892 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
