The Chelsea 899 Series Power Take-Off, part number 899CBFJW-M3ZS or 899CBFJWM3ZS, is a constant mesh PTO engineered specifically for Allison 4700 Series transmissions. The 899 Series mounts via a 10-bolt pattern and positions the pump mounting flange at the rear of the transmission to improve clearance between the pump and the transmission housing. Output is a SAE C 1-1/4"-14T pump spline with wet spline lubrication to extend both PTO and pump shaft service life. The main shaft is a single one-piece design, eliminating input splines between the PTO body and the output extension. Common applications include aerial trucks, fire and rescue trucks, snow and ice equipment, refuse trucks, and truck cranes. Call us to confirm proper fit for your application.
Features
Chelsea 899 Series constant mesh (non-shiftable) Power Take-Off
10-bolt mounting designed for Allison 4700 Series transmissions
SAE C output flange with 1-1/4"-14T wet-spline pump shaft
Pump flange relocated to rear of transmission for improved pump clearance
One-piece main shaft eliminates input splines between PTO and output extension
Suited for aerial, fire and rescue, refuse, snow and ice, and crane truck applications
Tech Specs
- Series: Chelsea 899 Series
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C 1-1/4"-14T Pump Spline
- Output Lubrication: Wet Spline
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP
- Transmission Fit: Allison 4700 Series
Additional Information
The Chelsea 899 Series was developed to address pump clearance challenges on the Allison 4700 platform. By relocating the pump interface to the rear of the transmission, the gear housing sits tight against the transmission body, allowing the unit to fit neatly between the transmission and the frame rail. The one-piece main shaft is a key structural distinction of the 899 Series versus extension-style designs. Wet Spline Technology keeps lubrication at the pump spline interface, reducing wear in continuous-duty and high-demand cycles. Typical market segments include on-highway vocational trucks: aerial and ladder units, pumper-cleaner trucks, refuse vehicles, and truck cranes. The 899 Series can be configured for transmissions equipped with or without a cooler or retarder.Parts Manual: Chelsea 899 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
