The Chelsea 890REFJW-G5XK or 890REFJWG5XK is a hydraulic PowerShift PTO assembly built for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts via a 10-bolt pattern and positions the pump output flange to the rear of the transmission, giving pumps more clearance than a conventional side-mount arrangement. A one-piece main shaft eliminates input splines between the PTO and output extension. The SAE C output uses Wet Spline Technology to reduce wear on the PTO and pump shaft in demanding duty cycles. Continuous torque rating reaches 670 ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common fits include aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes. Call us to confirm proper fitment for your specific Allison build.
The Chelsea 890 Series fits between the transmission and the frame rail, locating the pump output at the rear of the transmission for adequate clearance. Unlike a PTO-plus-extension setup, the 890 is a single unit with a one-piece shaft. The clutch sits at the rear of the PTO housing, allowing the gear section to tuck tightly against the transmission. The 890 Series can be configured for transmissions with or without a cooler, retarder, or both. Common applications include aerial trucks, fire and rescue apparatus, pumper cleaners, truck cranes, and refuse trucks.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C (XS) Wet Spline output extends PTO and pump shaft life in demanding conditions
Continuous-duty torque rating up to 670 ft-lb; intermittent torque rated at 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design eliminates input splines between PTO and output extension for improved clearance
Tech Specs
- Product Series: 890
- Transmission Fit: Allison 3000 MD and 4000 HD Series (Input Gear Designator: FJ)
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Output Shaft Type: SAE C (XS)
- Outlet Flange Type: SAE C
- Lubricant: Wet Spline
- Continuous Torque: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque: 501+ lb-ft
- 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 fits between the transmission and the frame rail, locating the pump output at the rear of the transmission for adequate clearance. Unlike a PTO-plus-extension setup, the 890 is a single unit with a one-piece shaft. The clutch sits at the rear of the PTO housing, allowing the gear section to tuck tightly against the transmission. The 890 Series can be configured for transmissions with or without a cooler, retarder, or both. Common applications include aerial trucks, fire and rescue apparatus, pumper cleaners, truck cranes, and refuse trucks.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
