The Chelsea 890 Series Power Take-Off, part number 890PAFJW-B5XK or 890PAFJWB5XK, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It uses a 10-bolt mounting pattern and delivers an SAE C ("XS") output with wet spline technology to extend pump shaft life under demanding duty cycles. The 890 Series positions the PTO/pump mounting flange to the rear of the transmission, improving clearance between the pump and frame rail. The one-piece main shaft eliminates the input splines that are typical of a PTO-plus-extension arrangement. Continuous-duty torque reaches 670 lb-ft, with intermittent torque rated at 501+ lb-ft. Shaft power is rated at 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Chelsea 890 Series PTO, part number 890PAFJW-B5XK or 890PAFJWB5XK
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") output shaft with wet spline technology for extended 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 and rear-mounted clutch position the pump output behind the transmission for improved frame-rail clearance
Tech Specs
- Transmission Application: 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") Wet Spline
- Lubricant Type: 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 at 500 RPM / 128 HP at 1,000 RPM (48 kW at 500 RPM / 95 kW at 1,000 RPM)
Additional Information
The Chelsea 890 Series is a single-unit design - not a PTO with a bolt-on extension. The one-piece main shaft eliminates input splines between the PTO body and the output, reducing potential wear points. The clutch is located at the rear of the PTO housing, allowing the gear section to tuck tightly against the transmission for maximum clearance between the pump and the frame rail. An additional support bracket at the rear of the transmission is included, supplementing the standard side-mount attachment points. The 890 Series accommodates Allison transmissions equipped with or without a cooler, a retarder, or both. Typical markets include aerial, fire and rescue, on-highway refuse, defense, and other mobile hydraulic applications.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
