The Chelsea 890RHFJW-K5XS or 890RHFJWK5XS is a hydraulic PowerShift PTO from the 890 Series, built specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and locates the pump output to the rear of the transmission, improving clearance between the pump and frame rail. The main shaft is a one-piece design, eliminating the input splines that a PTO-plus-extension setup would introduce. The SAE C ("XS") output shaft uses Wet Spline technology to extend pump shaft life under demanding duty cycles. Continuous torque capacity for the 890 Series reaches 670 ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1000 RPM. Typical applications include aerial trucks, fire and rescue units, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific Allison transmission configuration.
The Chelsea 890 Series is designed as a single-unit PTO, not a PTO paired with a separate extension. The clutch is positioned at the rear of the housing, allowing the gear section to tuck tightly against the Allison transmission for improved pump clearance. The 890 Series accommodates Allison transmissions equipped with or without a cooler, retarder, or both. Common service applications include aerial and fire and rescue trucks, pumper cleaners, refuse trucks, and truck cranes. Part number 890RHFJW-K5XS is also referenced as SP890RHFJW-K5XS.
Features
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
One-piece main shaft eliminates input splines between PTO and output extension
Continuous torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1000 RPM
Tech Specs
- Transmission Fit: 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: 670 ft-lb (908 Nm) - check application pages for actual rating
- Intermittent Torque: 501+ ft-lb (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1000 RPM
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series is designed as a single-unit PTO, not a PTO paired with a separate extension. The clutch is positioned at the rear of the housing, allowing the gear section to tuck tightly against the Allison transmission for improved pump clearance. The 890 Series accommodates Allison transmissions equipped with or without a cooler, retarder, or both. Common service applications include aerial and fire and rescue trucks, pumper cleaners, refuse trucks, and truck cranes. Part number 890RHFJW-K5XS is also referenced as SP890RHFJW-K5XS.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
