The Chelsea 890 Series Power Take-Off Assembly, part number 890CFFJW-B3XV or 890CFFJWB3XV, 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 to the rear of the transmission, tucking the housing tightly against the frame rail for improved clearance in tight installations. The one-piece main shaft eliminates input splines between the PTO body and the output extension. Continuous torque rating for the 890 Series reaches 670 ft-lb, with intermittent torque rated at 501+ ft-lb. The SAE C ("XS") output shaft uses wet spline lubrication to extend pump shaft life under demanding duty cycles. Shaft power output is 64 HP at 500 RPM and 128 HP at 1000 RPM. Common applications include aerial trucks, fire and rescue apparatus, truck cranes, and refuse trucks. Call us to confirm proper fit for your specific transmission configuration.
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. The clutch is positioned at the rear of the unit so the housing and gear section can seat tightly against the transmission, gaining clearance between the output flange and the frame rail. An additional bracket at the rear of the transmission provides supplemental support. The 890 Series can be configured for transmissions equipped with or without an oil cooler, a retarder, or both - confirm your transmission configuration when ordering.
Features
890 Series hydraulic hot shift PTO for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with rear-positioned pump output flange for improved frame rail clearance
One-piece main shaft design eliminates input splines between PTO body and output extension
Continuous torque rating: 670 ft-lb; intermittent torque: 501+ ft-lb
SAE C (XS) output shaft with wet spline lubrication for extended pump shaft life
Shaft power: 64 HP at 500 RPM, 128 HP at 1000 RPM
Tech Specs
- Transmission: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic Hot Shift (PowerShift)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS) - Extended Shaft
- Lubricant: Wet Spline
- 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 1000 RPM
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO paired with a separate extension. The clutch is positioned at the rear of the unit so the housing and gear section can seat tightly against the transmission, gaining clearance between the output flange and the frame rail. An additional bracket at the rear of the transmission provides supplemental support. The 890 Series can be configured for transmissions equipped with or without an oil cooler, a retarder, or both - confirm your transmission configuration when ordering.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
