The Chelsea 899JAFJW-M3CS or 899JAFJWM3CS is a constant-mesh Power Take-Off from the Chelsea 899 Series, designed specifically for Allison 4700 Series transmissions. The 899 Series positions the pump mounting flange at the rear of the transmission, giving improved pump clearance compared to conventional side-mount arrangements. A 10-bolt mounting pattern and SAE C outlet flange with a 1-1/4"-14T wet-spline output shaft are series-standard features. The one-piece mainshaft eliminates input splines between the PTO and output extension, and the wet-spline design extends pump shaft life under continuous-duty demands. Common applications for the 899 Series include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Designed for Allison 4700 Series transmissions
Constant-mesh (non-shiftable) operation
10-bolt mounting with SAE C outlet flange
SAE C 1-1/4"-14T wet-spline output shaft for extended pump shaft life
Rear-mounted pump flange for improved clearance between PTO and frame rail
One-piece mainshaft eliminates intermediate input splines
Tech Specs
- Mounting Type: 10-Bolt
- Shift Type: Constant Mesh
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C 1-1/4"-14T Pump Spline (Wet Spline)
- Output Power (Series): 56+ HP, 51+ kW
- Intermittent Torque (Series): 501+ lb-ft
- Transmission Application: Allison 4700 Series
Additional Information
Parts Manual: Chelsea 899 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
