The Chelsea 890 Series Power Take-Off (PTO) part number 890HAFJW-E5XK or 890HAFJWE5XK is a hydraulic hot-shift PTO built specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and uses hydraulic PowerShift engagement. The SAE C ("XS") output shaft features Wet Spline Technology to extend PTO and pump shaft life under demanding duty cycles. The 890 Series positions the pump mounting flange to the rear of the transmission, improving clearance in tight frame-rail installations. The main shaft is a single one-piece design, eliminating input splines between the PTO and output extension. Continuous-duty torque rating for the 890 Series reaches 670 ft-lb, with intermittent torque rated at 501+ ft-lb. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Typical applications include aerial trucks, fire and rescue vehicles, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific transmission configuration.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") Wet Spline output shaft for extended PTO and pump shaft life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque rated at 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
Rear-positioned pump flange improves clearance between transmission and frame rail
Tech Specs
- Transmission Compatibility: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C ("XS") Wet Spline
- Continuous Torque Rating: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque Rating: 501+ lb-ft
- Shaft Power: 64 HP at 500 RPM / 128 HP at 1,000 RPM
- Input Gear Designator: FJ (Allison 3000 MD and 4000 HD)
- Lubricant Type: Wet Spline
Additional Information
Chelsea 890 Series applications include aerial trucks, fire and rescue trucks, refuse trucks, pumper cleaners, and truck cranes. The 890 Series mounts like a standard side-mounted PTO but adds a support bracket at the rear of the transmission. It is a single-unit design with a one-piece main shaft, eliminating the input splines found between a standard PTO and an output extension. The clutch sits at the rear of the housing, allowing the gear section to tuck tightly against the transmission for maximum pump clearance. The unit can be ordered for transmissions equipped with or without a cooler, retarder, or both. Call Pro Gear and Transmission to confirm the correct configuration for your chassis and pump combination.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
