The Chelsea 890 Series Power Take-Off, part number 890JBFJW-B3ZS or 890JBFJWB3ZS, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts with a 10-bolt pattern and delivers continuous-duty torque up to 670 ft-lb, with intermittent torque ratings starting above 501 ft-lb. The SAE C output shaft uses Wet Spline technology to extend both PTO and pump shaft service life under demanding duty cycles. A one-piece main shaft eliminates the input splines between the PTO body and the output extension. The 890 Series locates the pump mounting flange at the rear of the transmission, improving pump clearance in tight frame-rail installations. Applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) operation
SAE C ("XS") output shaft with Wet Spline technology for extended pump shaft life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft power output: 64 HP at 500 RPM, 128 HP at 1000 RPM
One-piece main shaft design eliminates inter-unit input splines for improved reliability
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot shift)
- Output Shaft Type: SAE C ("XS") Wet Spline
- 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 1000 RPM
- Lubricant: 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 rigidity. The clutch is positioned at the rear of the PTO housing, allowing the gear section to tuck tightly against the transmission and maximize clearance between the pump and the frame rail. Because the main shaft is a single-piece design, there are no input splines between the PTO body and the output extension, reducing a common wear point in high-torque applications. The 890 Series can be configured for transmissions equipped with or without a cooler, a retarder, or both. Typical service applications include aerial work platforms, fire and rescue pumpers, refuse trucks, and truck cranes. Contact Pro Gear and Transmission to confirm the correct configuration for your transmission and pump setup.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
