The Chelsea 897XAFJW-M5AB or 897XAFJWM5AB is a constant-engagement power take-off from the Chelsea 897 Series, designed specifically for Allison 3000 and 4000 Series transmissions. The 897 Series moves the pump mounting flange to the rear of the transmission, tucking the housing tightly alongside the frame rail to improve pump clearance. A one-piece main shaft eliminates the input splines between the PTO and output extension. The SAE C output flange uses Chelsea wet spline technology to extend PTO and pump shaft life under demanding duty cycles. The 10-bolt mounting pattern installs like a standard side-mount PTO with an added rear-transmission support bracket. Typical applications include aerial trucks, fire and rescue, refuse, and truck cranes. Call us to confirm proper fit for your specific Allison configuration.
Features
Constant engagement (constant mesh) shift type for continuous-duty hydraulic applications
Designed for Allison 3000 and 4000 Series transmissions
10-bolt mounting with rear-transmission support bracket for added stability
SAE C output flange and output shaft type
Wet spline output extends pump shaft life in high-demand conditions
One-piece main shaft eliminates input splines between PTO body and output
Tech Specs
- Series: Chelsea 897
- Part Number: 897XAFJW-M5AB or 897XAFJWM5AB
- Transmission Fit: Allison 3000 and 4000 Series
- Mounting Type: 10-bolt
- Shift Type: Constant Engagement (Constant Mesh)
- Output Shaft Type: SAE C
- Outlet Flange Type: SAE C
- Output Lubrication: Wet Spline
- Intermittent Torque Rating: 501+ lb-ft
- Output Power: 56+ HP
- 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 separate extension. This design positions the pump interface at the rear of the transmission so the gear section tucks close to the transmission side, creating improved clearance compared to conventional side-mount units. The wet spline output interface reduces wear on both the PTO output and the mating pump shaft, which is particularly important in fire and rescue and aerial applications where the PTO runs for extended periods. The 897 Series accommodates Allison transmissions equipped with or without a cooler, retarder, or both. Common vocational fits include aerial trucks, pumper cleaners, refuse trucks, and truck cranes.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
