The Chelsea 890 Series Power Take-Off, part number 890RBFJW-B5AF or 890RBFJWB5AF, is a hydraulic hot-shift PTO engineered for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt pattern and positions the SAE C output flange to the rear of the transmission, improving pump clearance without requiring a separate extension. The main shaft is a single one-piece unit, eliminating the input splines between the PTO and the output extension. A wet-spline output lubricates the pump shaft interface for extended service life in demanding duty cycles. The clutch sits at the rear of the PTO housing, allowing the gear section to tuck tightly against the transmission. Continuous-duty torque reaches 670 ft-lbs, with intermittent torque rated above 501 ft-lbs. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse, and truck cranes. Call us to confirm proper fit for your application.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
SAE C (XS) output shaft positions pump to the rear of the transmission for improved clearance
Continuous-duty torque rating up to 670 ft-lbs; intermittent torque rated above 501 ft-lbs
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design eliminates input splines between PTO and output extension
Wet-spline output lubricates the pump shaft interface to extend PTO and pump shaft service life
Tech Specs
- Transmission Application: Allison 3000 MD Series and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hydraulic Hot Shift)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS) Output
- Lubricant / Spline Interface: Wet Spline
- Continuous Torque: 670 ft-lbs (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lbs / 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
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. Mounting follows a standard side-mount PTO footprint but includes an additional bracket at the rear of the transmission for added support. The design fits transmissions equipped with or without a cooler, retarder, or both. Typical applications include aerial trucks, fire and rescue pumpers, refuse trucks, snow and ice equipment, and truck cranes where pump space is limited and high torque output is required. A genuine Chelsea part sold by 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.
