The Chelsea 890 Series Power Take-Off, part number 890PAFJW-B5XY or 890PAFJWB5XY, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 10-bolt mounting configuration positions the pump output flange to the rear of the transmission, gaining clearance between the PTO and the frame rail without requiring a separate extension unit. The main shaft is one piece, eliminating the input splines found in extension-style setups. An SAE C ("XS") output shaft with wet-spline lubrication reduces wear on the pump shaft interface in demanding duty cycles. Continuous torque rating reaches 670 lb-ft, with intermittent capacity rated above 501 lb-ft. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. A genuine Chelsea part, available from Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mount
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") output shaft with wet-spline lubrication for extended shaft life
Continuous torque rating up to 670 lb-ft; intermittent torque rated 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design moves pump flange to the rear of the transmission for improved 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)
- Output Shaft Type: SAE C ("XS") Wet-Spline Output
- Outlet Flange Type: SAE C
- Continuous Torque Rating: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque Rating: 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 Type: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit PTO, not a PTO with a separate extension. The clutch is positioned at the rear of the housing so the gear section sits tight against the transmission, and the one-piece main shaft eliminates the input splines common to extension-style units. This rear-facing pump output location is particularly suited to applications where pump clearance between the transmission and frame rail is limited. Common applications for the 890 Series include aerial trucks, fire and rescue trucks, refuse trucks, snow and ice equipment, and truck cranes. The unit can be ordered for transmissions equipped with or without a cooler or retarder, or both. Part number 890PAFJW-B5XY is also referenced as SP890PAFJW-B5XY.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
