The Chelsea 897LEFJW-M5AZ is a constant-engagement power take-off from the 897 Series, engineered specifically for Allison 3000 and 4000 Series transmissions. The 10-bolt mounting design positions the PTO/pump flange at the rear of the transmission, tucking the housing tightly against the transmission to improve clearance between the pump and the frame rail. The output shaft is SAE C with wet spline technology, which extends both PTO and pump shaft life under demanding duty cycles. The 897 Series uses a one-piece main shaft, eliminating the input splines found in PTO-plus-extension configurations. Intermittent torque rating for the series reaches 501+ lb-ft, with continuous-duty torque ratings up to 670 lb-ft (de-rate 30% for continuous). Typical applications include aerial trucks, fire and rescue, refuse, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Constant-engagement (constant mesh) design for Allison 3000 and 4000 Series transmissions
10-bolt mounting with pump flange relocated to the rear of the transmission for improved clearance
SAE C output shaft with wet spline technology to extend PTO and pump shaft service life
One-piece main shaft eliminates input splines between PTO body and output extension
Series intermittent torque rating: 501+ lb-ft; continuous-duty up to 670 lb-ft (apply 30% de-rate)
Suited for aerial trucks, fire and rescue, refuse trucks, and truck crane applications
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Constant Engagement
- Input Gear Designator: FJ - Allison World Transmissions
- Output Shaft Type: SAE C
- Outlet Flange Type: SAE C
- Lubricant/Output: W - Wet Spline
- Intermittent Torque (Series): 501+ lb-ft / 501+ Nm
- Output Power (Series): 56+ HP / 51+ kW
- Transmission Fit: Allison 3000 Series, Allison 4000 Series
- Dimensions (H x W x L): 13 in. x 11 in. x 31 in.
Additional Information
The 897 Series is a single-unit PTO, not a PTO paired with a bolt-on extension. The pump interface at the rear of the transmission allows the gear section to sit close to the transmission housing, providing the clearance needed in tight frame-rail installations. The series accommodates transmissions equipped with or without a cooler, a retarder, or both. Also referenced as SP897LEFJW-M5AZ. Pro Gear and Transmission carries genuine Chelsea parts -- give us a call if you need to confirm the right PTO configuration for your transmission build.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
