The Chelsea 890 Series Power Take-Off 890HAFJW-K5AZ or 890HAFJWK5AZ 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 positions the pump output to the rear of the transmission, giving the pump substantially more clearance than a conventional side-mount PTO. The main shaft is a single one-piece design, eliminating the input splines found between a PTO body and a separate output extension. Wet-spline output technology reduces wear on both the PTO and pump shaft under continuous-duty demand. Continuous torque rating reaches 670 ft-lb, with intermittent torque exceeding 501 ft-lb. Shift type is Hydraulic PowerShift. Output flange is SAE C. Shaft power is 64 HP at 500 RPM and 128 HP at 1,000 RPM. A genuine Chelsea part sold by Pro Gear and Transmission. Call us to confirm proper fit for your specific transmission configuration.
The Chelsea 890 Series fits neatly between the transmission and the frame rail, with the clutch located at the rear of the PTO housing so the gear section tucks tightly against the transmission. This layout provides clearance for aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes where pump space is limited. The unit can be ordered for transmissions equipped with or without a cooler, a retarder, or both. An additional support bracket at the rear of the transmission is included. Part number 890HAFJW-K5AZ is also referenced as SP890HAFJW-K5AZ.
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
Single one-piece main shaft eliminates inter-stage input splines
Wet-spline output extends PTO and pump shaft life in demanding duty cycles
Continuous torque rating up to 670 ft-lb; intermittent torque exceeds 501 ft-lb
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Product Series: 890
- 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
- 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 Type: Wet Spline
Additional Information
The Chelsea 890 Series fits neatly between the transmission and the frame rail, with the clutch located at the rear of the PTO housing so the gear section tucks tightly against the transmission. This layout provides clearance for aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes where pump space is limited. The unit can be ordered for transmissions equipped with or without a cooler, a retarder, or both. An additional support bracket at the rear of the transmission is included. Part number 890HAFJW-K5AZ is also referenced as SP890HAFJW-K5AZ.
