The Chelsea 897HCFJW-M5AF or 897HCFJWM5AF is a constant-engagement power take-off from the Chelsea 897 Series, engineered specifically for Allison 3000 and 4000 Series transmissions. The 897 Series uses a 10-bolt mounting configuration and positions the SAE C output flange at the rear of the transmission housing, moving the pump interface rearward for improved clearance between the pump and the frame rail. A one-piece main shaft eliminates the input splines found on extension-style units, and wet spline output technology extends both PTO and pump shaft service life under demanding duty cycles. Typical applications include aerial trucks, fire and rescue apparatus, truck cranes, refuse trucks, and snow and ice equipment. Call us to confirm proper fit for your specific transmission configuration.
Features
Designed for Allison 3000 and 4000 Series transmissions
10-bolt mounting configuration
SAE C output flange and output shaft type
Constant engagement (constant mesh) shift type
Wet spline output extends PTO and pump shaft life
Rear-of-transmission pump placement improves frame-rail clearance
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Constant Engagement (Constant Mesh)
- Input Gear: Allison World Transmissions (Allison 3000/4000 Series)
- Output Shaft Type: SAE C
- Outlet Flange Type: SAE C
- Lubrication: Wet Spline
- Intermittent Torque Rating: 501+ lb-ft (series rating)
- Output Power: 56+ HP (series rating)
- Transmission Application: Allison 3000 Series, Allison 4000 Series
Additional Information
The Chelsea 897 Series is a single-unit PTO, not a PTO-with-extension design. The one-piece main shaft eliminates the input splines between the PTO body and the output extension, reducing potential leak and wear points. The pump interface locates at the rear of the transmission so the housing and gear section tuck tightly against the transmission for improved clearance between the pump and the truck frame rail. An additional bracket at the rear of the transmission provides supplemental support beyond the standard side-mount bolting pattern. Typical markets include aerial, fire and rescue, refuse, snow and ice, defense, and on-highway applications where pump space is limited and high torque output is required.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
