The Chelsea 890 Series Power Take-Off, part number 890LFFJW-G5AF or 890LFFJWG5AF, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and uses a one-piece main shaft that positions the clutch at the rear of the PTO housing, moving the SAE C output flange rearward to improve pump clearance between the transmission and frame rail. Wet Spline output extends pump shaft service life in demanding duty cycles. The 890 Series delivers a continuous-duty torque rating up to 670 ft-lb and intermittent torque of 501+ ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse, and truck crane work. Call us to confirm proper fit for your specific transmission configuration.
Features
Hydraulic PowerShift (hot shift) operation for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with an additional rear bracket for added support
SAE C (XS) output shaft and outlet flange
One-piece main shaft relocates the pump output to the rear of the transmission for improved pump clearance
Wet Spline output lubrication extends PTO and pump shaft service life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb; shaft power 64 HP at 500 RPM and 128 HP at 1,000 RPM
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS)
- Continuous Torque Rating: 670 ft-lb (see application pages for confirmed 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/Output: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO - not a PTO with a bolt-on extension. The one-piece main shaft eliminates the input splines between the PTO and output extension, reducing potential wear points. The clutch assembly is positioned at the rear of the PTO housing, allowing the gear section to sit tightly against the transmission and gain clearance between the pump flange and the frame rail. Wet Spline Technology lubricates the output interface continuously, which is particularly valuable in high-cycle applications such as aerial trucks, fire and rescue pumpers, refuse equipment, and truck cranes. The unit accommodates Allison transmissions equipped with or without a cooler, a retarder, or both. Cross-reference: SP890LFFJW-G5AF. Available from Pro Gear and Transmission - call us 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.
