The Chelsea 890 Series Power Take-Off, part number 890KAFJW-D5XY or 890KAFJWD5XY, 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 positions the SAE C flange output to the rear of the transmission, tucking the housing tightly between the transmission and the frame rail for improved pump clearance. The main shaft is a single one-piece unit, eliminating input splines between the PTO body and the output extension. Wet Spline output technology protects both the PTO and pump shaft splines under demanding duty cycles. Continuous-duty torque reaches 670 ft-lb, with intermittent torque rated at 501+ ft-lb. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Call us to confirm proper fit for your application.
Typical applications include aerial trucks, fire and rescue trucks, pumper-cleaner units, truck cranes, refuse trucks, and snow and ice equipment, making it a common choice wherever pump clearance and continuous high-torque output are priorities.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic hot-shift (PowerShift) engagement
SAE C (XS) output flange and shaft type
One-piece main shaft eliminates PTO-to-extension input splines for improved reliability
Wet Spline output extends PTO and pump shaft life in demanding applications
Continuous-duty torque rating up to 670 ft-lb; shaft power 64 HP at 500 RPM, 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
- Output Shaft Type: SAE C (XS)
- 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 1,000 RPM
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit design, not a PTO with a separate extension. The clutch is located at the rear of the PTO housing, allowing the gear section to sit tight against the transmission for maximum pump clearance. An additional bracket at the rear of the transmission provides supplemental support. The 890 Series can be ordered for transmissions equipped with or without a cooler, retarder, or both.Typical applications include aerial trucks, fire and rescue trucks, pumper-cleaner units, truck cranes, refuse trucks, and snow and ice equipment, making it a common choice wherever pump clearance and continuous high-torque output are priorities.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
