The Chelsea 897LFFJW-M5ZS is a constant mesh (constant engagement) power take-off built for Allison 3000 and 4000 Series transmissions. Part of the 897 Series, it mounts via a 10-bolt pattern and positions the SAE C output flange at the rear of the transmission, moving the pump mounting point back for improved clearance between the pump and frame rail. The main shaft is a single one-piece design, eliminating the input splines that exist between a standard PTO and an output extension. The wet spline output lubricates the pump shaft interface to extend service life under demanding duty cycles. Typical applications include aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Constant mesh (constant engagement) operation - no clutch shift required
10-bolt mounting pattern fits Allison 3000 and 4000 Series transmissions
SAE C outlet flange and output shaft type
Rear-of-transmission pump location improves clearance between pump and frame rail
One-piece main shaft eliminates input splines between PTO body and output extension
Wet spline output extends PTO and pump shaft service life in high-demand applications
Tech Specs
- Mounting Type: 10-Bolt
- Transmission Fit: Allison 3000 Series, Allison 4000 Series
- Shift Type: Constant Mesh / Constant Engagement
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C
- Output Power (Series): 56+ HP / 51+ kW
- Intermittent Torque (Series): 501+ lb-ft / 501+ Nm
- Lubricant Interface: Wet Spline
- Dimensions (H x W x L): 13 in. x 11 in. x 31 in.
- NMFC Code: 128520 - Hydraulic PTOs, Pumps, Motors, etc.
- Also referenced as: SP897LFFJW-M5ZS
Additional Information
The Chelsea 897 Series was engineered specifically to address pump clearance limitations on Allison 3000 and 4000 Series transmissions. Unlike a conventional side-mounted PTO paired with a separate output extension, the 897 Series is a single integrated unit. The housing and gear section tuck tightly against the transmission while the pump interface extends to the rear, creating adequate working space even in tight frame configurations. An additional support bracket at the rear of the transmission provides structural stability beyond the standard 10-bolt side mount. The 897LFFJW-M5ZS can be specified for transmissions equipped with or without a cooler, a retarder, or both. For help confirming the right configuration for your truck, contact Pro Gear and Transmission directly.Parts Manual: Chelsea 897 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
