The Chelsea 890 Series Power Take-Off, part number 890UBFJW-B5XY or 890UBFJWB5XY, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and locates the SAE C pump output flange at the rear of the transmission, tucking between the transmission and the frame rail for improved pump clearance. The one-piece main shaft eliminates input splines between the PTO body and the output extension. Wet-spline output technology extends both PTO and pump shaft service life under 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 rated at 64 HP at 500 RPM and 128 HP at 1,000 RPM. Typical applications include aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes. A genuine Chelsea part available from Pro Gear and Transmission. Call us to confirm proper fit for your specific Allison-equipped vehicle.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot-shift) engagement
SAE C (XS) output flange and shaft type
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 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-demand applications
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS) Output
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- Shaft Power: 64 HP at 500 RPM; 128 HP at 1,000 RPM
- Lubricant: Wet Spline
Additional Information
The 890 Series mounts like a standard side-mounted PTO but adds a rear-of-transmission support bracket for rigidity. The clutch is positioned at the rear of the PTO housing, allowing the gear section to sit tightly against the transmission for maximum frame-rail clearance. Unlike a PTO-plus-extension arrangement, the 890 Series is a single unit with a one-piece main shaft, eliminating the spline interface between the PTO body and output extension. Wet Spline Technology lubricates the output interface continuously, reducing wear in high-cycle applications such as aerial boom trucks and pumper-cleaner units. The unit can be configured for transmissions equipped with a cooler, retarder, both, or neither.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
