The Chelsea 897NGFJW-M3CZ is a 10-bolt, constant-engagement power take-off from the 897 Series, engineered specifically for Allison 3000 and 4000 Series transmissions. The design moves the pump mounting flange to the rear of the transmission, giving the pump room it needs without requiring a separate extension unit. The main shaft is one piece, which eliminates the input splines found between a standard PTO and an output extension. Output is SAE C flange with Wet Spline Technology, extending pump shaft life under continuous-duty conditions. The 897 Series delivers 56+ HP and 501+ lb-ft intermittent torque at the series level, making it a fit for aerial trucks, fire and rescue, refuse, and snow and ice applications. Pro Gear and Transmission carries this genuine Chelsea unit.
Features
Fits Allison 3000 and 4000 Series transmissions (FJ input gear designator)
10-bolt mounting, installs like a standard side-mounted PTO with added rear bracket support
SAE C output flange and output shaft type
Wet Spline output (W designation) for extended PTO and pump shaft life
Constant engagement shift type (M designator) - no clutch-type engagement required
897 Series intermittent torque rating: 501+ lb-ft / 501+ Nm; output power 56+ HP / 51+ kW
Tech Specs
- Product Series: 897
- Mounting Type: 10-Bolt
- Shift Type: Constant Engagement (M)
- Input Gear Designator: FJ - Allison World Transmissions
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C
- Lubricant/Output: Wet Spline (W)
- Series Intermittent Torque: 501+ lb-ft / 501+ Nm
- Series Output Power: 56+ HP / 51+ kW
- Continuous Torque: De-rate 30% from intermittent rating (see application pages for actual torque ratings)
Additional Information
The 897 Series is a single-unit PTO - not a PTO paired with a bolt-on extension. Its one-piece main shaft eliminates the input splines that typically exist between a separate PTO body and an output extension, reducing potential leak and wear points. The pump interface locates at the rear of the transmission, allowing the housing and gear section to tuck tightly against the transmission for improved clearance within the frame rail. The unit supports configurations for transmissions equipped with or without a cooler, retarder, or both. Typical applications at the series level include aerial trucks, fire and rescue trucks, refuse trucks, pumper-cleaners, and truck cranes.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
