The Chelsea 897LAFJW-M5ZS or 897LAFJWM5ZS is a constant-engagement power take-off from the Chelsea 897 Series, engineered specifically for Allison 3000 and 4000 Series transmissions. It mounts via a 10-bolt pattern and positions the SAE C output flange at the rear of the transmission, moving the pump interface rearward to improve clearance between the pump and the frame rail. The wet spline output extends PTO and pump shaft life under demanding duty cycles. Unlike a PTO-plus-extension arrangement, the 897 Series uses a one-piece main shaft, eliminating input splines between the PTO body and the output. Typical applications include aerial trucks, fire and rescue trucks, refuse trucks, and truck cranes where pump space and sustained torque output are critical. Call us to confirm proper fit for your application.
Features
Fits Allison 3000 and 4000 Series transmissions
10-bolt mounting pattern
SAE C outlet flange and output shaft type
Constant-engagement (constant mesh) shift type
Wet spline output for extended PTO and pump shaft life
One-piece main shaft eliminates input splines between PTO body and output extension
Tech Specs
- Series: Chelsea 897
- 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 Power: 56+ HP (51+ kW) - series rating
- Intermittent Torque: 501+ lb-ft (501+ Nm) - series rating
- Lubricant/Output Interface: Wet Spline
- Dimensions (H x W x L): 13 in. x 11 in. x 31 in.
Additional Information
The Chelsea 897 Series was designed to fit neatly between the transmission and the frame rail, locating the pump output rearward for adequate clearance. It can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Wet Spline Technology at the output interface reduces wear on both the PTO and the mating pump shaft in high-cycle or high-torque applications. Common markets include aerial, fire and rescue, refuse, defense, and on-highway equipment where pump envelope space is restricted and sustained torque demand is high.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
