The Chelsea 897 Series Power Take-Off Assembly, part number 897MDFJW-M5XS or 897MDFJWM5XS, is a constant-engagement PTO engineered for Allison 3000 and 4000 Series transmissions. It uses a 10-bolt mounting configuration and positions the SAE C output flange to the rear of the transmission, moving the pump interface away from the frame rail for improved clearance. The one-piece main shaft eliminates the input splines that a PTO-plus-extension setup would require. Continuous-duty torque capacity reaches 670 ft-lb (908 Nm); intermittent torque is rated above 501 ft-lb. Output power exceeds 56 HP at the shaft. The wet-spline output lubrication extends pump-shaft service life in demanding duty cycles. Common applications include aerial trucks, fire and rescue apparatus, truck cranes, and refuse vehicles. Available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 897 Series mounts like a standard side-mount PTO but adds a rear bracket at the back of the transmission for additional support. The housing and gear section tuck tightly against the transmission, while the pump interface extends rearward to clear the frame rail. The one-piece main shaft design eliminates the inter-shaft splines found on a PTO-and-extension combination, reducing potential wear points. Wet Spline Technology on the output is standard across the 897 Series, supporting long service intervals in aerial, fire and rescue, snow and ice, and refuse applications.
Features
Fits Allison 3000 and 4000 Series transmissions via 10-bolt mount
Constant-engagement (constant mesh) shift type
SAE C output flange and SAE C (XS extended) output shaft
Continuous-duty torque rating up to 670 ft-lb (908 Nm); intermittent torque 501+ ft-lb
Shaft power output: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Wet-spline output lubrication for extended PTO and pump shaft life
Tech Specs
- Transmission Application: Allison 3000 and 4000 Series (World Transmissions)
- Mounting Type: 10-Bolt
- Shift Type: Constant Engagement (Constant Mesh)
- Input Gear Designator: FJ - Allison World Transmissions
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C Extended (XS)
- Lubricant: Wet Spline (W)
- Continuous Torque: 670 ft-lb / 908 Nm (verify actual rating on application pages)
- Intermittent Torque: 501+ ft-lb / 501+ Nm
- Output Power: 56+ HP / 51+ kW
- Shaft Power at 500 RPM: 64 HP / 48 kW
- Shaft Power at 1,000 RPM: 128 HP / 95 kW
- Dimensions (H x W x L): 13 in. x 11.75 in. x 31.38 in.
Additional Information
The Chelsea 897 Series mounts like a standard side-mount PTO but adds a rear bracket at the back of the transmission for additional support. The housing and gear section tuck tightly against the transmission, while the pump interface extends rearward to clear the frame rail. The one-piece main shaft design eliminates the inter-shaft splines found on a PTO-and-extension combination, reducing potential wear points. Wet Spline Technology on the output is standard across the 897 Series, supporting long service intervals in aerial, fire and rescue, snow and ice, and refuse applications.
