The Chelsea 897 Series Power Take-Off, part number 897HFFJW-M5AZ or 897HFFJWM5AZ, is a constant-mesh PTO engineered specifically for Allison 3000 and 4000 Series transmissions. The 897 Series mounts via a 10-bolt pattern and positions the SAE C pump output flange to the rear of the transmission, improving pump clearance and allowing the housing to tuck tightly against the transmission without requiring a separate extension. The main shaft is a single-piece design that eliminates the input splines between the PTO body and output extension. A wet spline output extends pump shaft life in demanding duty cycles. Intermittent torque rating for the 897 Series exceeds 501 lb-ft. Typical applications include aerial trucks, fire and rescue trucks, refuse vehicles, and truck cranes. Available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Fits Allison 3000 and 4000 Series transmissions
Constant-mesh (constant engagement) operation
10-bolt transmission mounting pattern
SAE C outlet flange and output shaft type
Wet spline output extends PTO and pump shaft life
Rear-mounted pump flange improves clearance between PTO and frame rail
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh (Constant Engagement)
- Transmission Application: Allison 3000 and 4000 Series
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C
- Output Spline Lubrication: Wet Spline
- Series Intermittent Torque: 501+ lb-ft / 501+ Nm
- Series Output Power: 56+ HP / 51+ kW
- Input Gear Designator: FJ (Allison World Transmissions)
- 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 extension. Its one-piece main shaft design removes the splined connection between the PTO body and output extension, reducing a potential wear point. The rear-positioned pump interface allows the gear housing to sit closer to the transmission for tighter packaging in tight frame-rail installations. The 897 Series accommodates Allison transmissions configured with or without a cooler, retarder, or both. Common vocations include aerial work platforms, fire and rescue pumpers, snow and ice equipment, and refuse trucks where pump space is limited and high continuous torque is required.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
