The Chelsea 890 Series Power Take-Off, part number 890HAFJW-G5XY or 890HAFJWG5XY, is a hydraulic hot-shift PTO engineered for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the pump output at the rear of the transmission, giving you more clearance between the pump and the frame rail. The one-piece main shaft eliminates input splines between the PTO and the output extension, and the clutch sits at the rear of the housing so the gear section tucks tight to the transmission. Output is an SAE C ("XS") flange with wet-spline technology to extend pump shaft life under demanding duty cycles. Continuous torque is rated up to 670 lb-ft; intermittent torque exceeds 501 lb-ft. Shaft power runs 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
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) operation
SAE C ("XS") wet-spline output extends PTO and pump shaft life
One-piece main shaft eliminates input splines between PTO body and output extension
Continuous 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
Tech Specs
- Transmission Fitment: 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
- Lubricant: Wet Spline
- Continuous Torque: 670 lb-ft (verify against application pages for actual rating)
- Intermittent Torque: 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
Additional Information
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
