The Chelsea 890 Series Power Take-Off Assembly, part number 890HBFJW-B5AF or 890HBFJWB5AF, is engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It uses a 10-bolt mounting configuration with hydraulic PowerShift engagement and delivers an SAE C (XS) output flange. Continuous-duty torque rating reaches 670 lb-ft, with intermittent torque rated at 501+ lb-ft. Shaft power output is 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 wet-spline output extends pump shaft life under demanding duty cycles. The clutch is positioned at the rear of the PTO housing so the gear section tucks tightly against the transmission, improving clearance between the pump and the frame rail. Common applications include aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes. A genuine Chelsea part, available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
The Chelsea 890 Series mounts like a standard side-mounted PTO but adds a rear bracket at the transmission for additional support. It is a single integrated unit, not a PTO paired with a separate extension, making it well suited for aerial trucks, fire and rescue, refuse, and crane applications where pump space is limited and high continuous torque is required.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot-shift) engagement
SAE C (XS) output flange with wet-spline technology to extend pump shaft life
Continuous-duty torque rating up to 670 lb-ft; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft with rear-positioned clutch for improved pump-to-frame clearance
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot-Shift)
- Output Shaft Type: SAE C (XS) Wet Spline
- Outlet Flange Type: SAE C
- 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
- Lubricant: Wet Spline
- Product Series: 890
Additional Information
The Chelsea 890 Series mounts like a standard side-mounted PTO but adds a rear bracket at the transmission for additional support. It is a single integrated unit, not a PTO paired with a separate extension, making it well suited for aerial trucks, fire and rescue, refuse, and crane applications where pump space is limited and high continuous torque is required.
