The Chelsea 890 Series Power Take-Off, part number 890CBFJW-B3CZ or 890CBFJWB3CZ, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series mounts at the side of the transmission using a 10-bolt pattern and positions the SAE C output flange to the rear, moving the pump farther back for improved clearance between the pump and the frame rail. The one-piece main shaft eliminates the input splines found in extension-style designs, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Wet-spline output technology reduces wear on PTO and pump shaft splines in demanding duty cycles. Continuous torque rating reaches 670 ft-lb, with intermittent torque exceeding 501 ft-lb. Shaft power measures 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial, fire and rescue, refuse, and truck crane equipment. Call us to confirm proper fit for your specific Allison transmission configuration.
Features
Chelsea 890 Series, 10-bolt hydraulic PowerShift (hot-shift) PTO
Fits Allison 3000 MD and 4000 HD Series transmissions
SAE C (XS) output shaft and SAE C outlet flange
Continuous torque rating up to 670 ft-lb; intermittent torque exceeds 501 ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Wet-spline output extends PTO and pump shaft life in high-demand applications
One-piece main shaft design - no input splines between PTO body and output extension
Tech Specs
- Transmission Fit: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C (XS)
- 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 1,000 RPM
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO with a bolt-on extension. The clutch is positioned at the rear of the housing, allowing the gear section to sit tight against the transmission body, which keeps the overall profile compact while moving the pump mounting point to the rear of the transmission for clearance. The unit mounts like a standard side-mounted PTO but includes an additional support bracket at the rear of the transmission. The 890 Series is compatible with Allison configurations with or without a cooler, retarder, or both. Typical markets include aerial work platforms, fire and rescue trucks, snow and ice equipment, refuse trucks, and truck cranes, where pump space is limited and high continuous torque is required. Part number 890CBFJW-B3CZ is also referenced as SP890CBFJW-B3CZ.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
