The Chelsea 890RGFJW-B5AF or 890RGFJWB5AF is a hydraulic hot-shift power take-off from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It uses a 10-bolt mounting pattern and delivers an SAE C ("XS") output flange, making it a direct fit for high-demand hydraulic pump applications. The one-piece main shaft eliminates input splines between the PTO and output extension, and the clutch is positioned at the rear of the housing so the gear section tucks tightly against the transmission. Continuous-duty torque is rated up to 670 ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. Wet-spline output technology extends pump shaft life in demanding 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
Chelsea 890 Series PTO designed for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting pattern with SAE C ("XS") output shaft and flange
Hydraulic PowerShift (hot-shift) engagement
Continuous-duty torque rating up to 670 ft-lb; intermittent torque rated 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Wet-spline output extends PTO and pump shaft life in high-cycle applications
One-piece main shaft eliminates input splines between PTO body and output extension
Tech Specs
- Transmission Application: Allison 3000 MD Series and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C ("XS") Output
- Outlet Flange Type: SAE C
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Lubricant/Spline Interface: Wet Spline
Additional Information
The Chelsea 890 Series mounts like a standard side-mounted PTO but adds a support bracket at the rear of the transmission for additional stability. The PTO locates the pump output to the rear of the transmission, providing clearance between the pump and the frame rail without requiring a separate extension unit. The clutch is positioned at the rear of the PTO housing so the gear section sits tightly against the transmission case. This design is well-suited for aerial platforms, fire and rescue pumpers, snow and ice equipment, refuse trucks, and truck cranes where both pump clearance and continuous high-torque output are critical requirements. Part number 890RGFJW-B5AF is also referenced as SP890RGFJW-B5AF. Available from Pro Gear and Transmission.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
