The Chelsea 890 Series Power Take-Off, part number 890NGFJW-B3CS or 890NGFJWB3CS, 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 pump output at the rear of the transmission, placing the mounting flange behind the gearbox to give pumps adequate clearance even in tight frame-rail installations. The SAE C output shaft uses Wet Spline Technology to extend shaft life under continuous load. Continuous-duty torque is rated up to 670 ft-lb, with intermittent capacity exceeding 501 ft-lb. Shift is hydraulic PowerShift. The one-piece main shaft eliminates input splines between the PTO body and the output extension. A genuine Chelsea part, available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions
Hydraulic PowerShift (hot-shift) engagement
10-bolt mounting with rear-of-transmission pump flange placement for improved pump clearance
SAE C output shaft with Wet Spline Technology for extended spline life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft power output: 64 HP at 500 RPM, 128 HP at 1000 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) Wet Spline
- Continuous Torque: 670 ft-lb (check application pages for actual 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 1000 RPM
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series is built as a single unit, not a PTO with a bolt-on extension. The one-piece main shaft eliminates the input splines that a conventional PTO-plus-extension arrangement requires, reducing potential failure points. The clutch is located at the rear of the PTO housing, allowing the gear section to tuck tightly against the transmission for improved frame-rail clearance. The rear flange position makes the 890 Series well suited to aerial trucks, fire and rescue apparatus, snow and ice equipment, and refuse vehicles where pump space is limited and torque demands are high. The unit can be ordered for transmissions fitted with or without a cooler, a retarder, or both. SP890NGFJW-B3CS is an alternate catalog reference for the same assembly.Parts manual and diagrams: Chelsea 890 Series PTO parts list with prices
