The Chelsea 897CEFJW-M3CS or 897CEFJWM3CS is a constant-mesh power take-off built for Allison 3000 and 4000 Series transmissions. Part of the 897 Series, it uses a 10-bolt mounting configuration and positions the pump output flange at the rear of the transmission housing, tucking the gear section tightly against the transmission to gain clearance between the PTO and the frame rail. The one-piece main shaft eliminates input splines between the PTO body and the output extension. Output is SAE C flange type with wet spline technology, which extends service life on the pump shaft interface under demanding duty cycles. The series carries an intermittent torque rating above 501 lb-ft with output power exceeding 56 HP. Typical applications include aerial work trucks, fire and rescue apparatus, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Constant-mesh (constant engagement) design for Allison 3000 and 4000 Series transmissions
10-bolt mounting type with an additional rear bracket for transmission support
SAE C outlet flange and SAE C output shaft type
Wet spline output technology to extend PTO and pump shaft life
Rear-of-transmission pump interface improves clearance between PTO and frame rail
One-piece main shaft eliminates input splines between PTO body and output extension
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh / Constant Engagement
- Input Gear Designator: FJ - Allison World Transmissions
- Lubricant/Output: W - Wet Spline
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C
- Intermittent Torque Rating: 501+ lb-ft
- Output Power: 56+ HP
- Transmission Fitment: Allison 3000 Series, Allison 4000 Series
- Dimensions (H x W x L): 13 in. x 11 in. x 31 in.
Additional Information
The Chelsea 897 Series is a single-unit PTO, not a PTO with a bolt-on output extension. The pump interface locates at the rear of the transmission, allowing the housing and gear section to sit close to the transmission body. This geometry is especially useful on aerial trucks, pumper cleaners, and fire apparatus where hydraulic pump clearance to the frame rail is limited. The 897 Series can be ordered for transmissions configured with or without a cooler, a retarder, or both. Wet Spline Technology is standard on this part number, lubricating the pump shaft interface to reduce wear in high-cycle applications. Also referenced as SP897CEFJW-M3CS in some catalog sources.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
