The Chelsea 890 Series Power Take-Off, part number 890XFFJW-D5XY or 890XFFJWD5XY, 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 delivers a continuous-duty torque rating of 670 ft-lb, with intermittent torque exceeding 501 ft-lb. The SAE C output shaft features Wet Spline technology to extend PTO and pump shaft life under demanding conditions. Shaft power output reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. The one-piece main shaft eliminates input splines between the PTO and output extension, and the clutch positions at the rear of the housing to keep the gear section tight to the transmission for improved frame-rail clearance. Common applications include aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) operation
SAE C output shaft with Wet Spline technology for extended pump and PTO shaft life
Continuous-duty torque rating of 670 ft-lb; intermittent torque exceeding 501 ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design; clutch positioned at rear of housing for improved pump clearance
Tech Specs
- Transmission Application: Allison 3000 MD Series and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C (XS) Output
- Outlet Flange Type: SAE C
- Lubricant: Wet Spline
- Continuous Torque: 670 ft-lb (see 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
Additional Information
The Chelsea 890 Series is a single-unit PTO - not a PTO with a bolt-on extension. The one-piece main shaft removes the input splines that exist on conventional PTO-plus-extension setups, reducing a potential wear and leak point. The clutch assembly sits at the rear of the PTO housing, allowing the gear section to tuck tightly against the transmission and fit between the transmission and the frame rail. This geometry moves the pump output rearward for clearance in tight chassis installations. An additional bracket at the rear of the transmission provides supplemental support beyond the standard side-mount pattern. The 890 Series accommodates Allison transmissions equipped with a cooler, a retarder, both, or neither. Typical applications include aerial lift trucks, fire and rescue pumpers, refuse packers, and truck cranes - anywhere pump space is limited and high continuous torque is required. Part number 890XFFJW-D5XY is sold by Pro Gear and Transmission. Call us to confirm proper fit for your chassis and transmission build.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
