The Chelsea 897HAFJW-M5XK or 897HAFJWM5XK is a constant mesh power take-off from the 897 Series, engineered specifically for Allison 3000 and 4000 Series transmissions. The 10-bolt mounting design positions the SAE C output flange at the rear of the transmission, moving the pump interface rearward for improved clearance between the pump and frame rail. A one-piece main shaft eliminates intermediate input splines, and wet spline output technology extends PTO and pump shaft life under demanding duty cycles. This series carries an intermittent torque rating above 501 lb-ft and output above 56 HP, making it well suited for aerial trucks, fire and rescue units, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
10-bolt mounting designed for Allison 3000 and 4000 Series transmissions
Constant mesh engagement with rear-positioned SAE C output flange for improved pump clearance
Wet spline output extends PTO and pump shaft service life in demanding applications
One-piece main shaft eliminates input splines between PTO body and output extension
Intermittent torque rating above 501 lb-ft; output above 56 HP
Suited for aerial, fire and rescue, refuse, and truck crane applications
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh (Constant Engagement)
- Input Gear Designator: FJ - Allison World Transmissions
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C
- Lubricant/Output Option: W - Wet Spline
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP
- Compatible Transmissions: Allison 3000 Series, Allison 4000 Series
- Dimensions (H x W x L): 13 in. x 11 in. x 32 in.
Additional Information
The Chelsea 897 Series is a single-unit PTO, not a PTO-with-extension configuration. The housing and gear section tucks tightly alongside the transmission, while the pump interface locates at the rear for adequate working space between the pump and frame rail. An additional bracket at the rear of the transmission provides supplemental support beyond standard side-mount hardware. The 897 Series can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Parker Chelsea publishes an owner's manual and parts list covering the 890/897 Series; contact Pro Gear and Transmission for documentation or to confirm the right configuration for your truck.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
