The Chelsea 890HEFJW-G5XK or 890HEFJWG5XK is a hydraulic hot-shift power take-off from the Chelsea 890 Series, engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It uses a 10-bolt mounting pattern and features an SAE C (XS) output shaft with Wet Spline technology to extend both PTO and pump shaft life under demanding duty cycles. The one-piece main shaft eliminates input splines between the PTO body and the output extension, while the rear-mounted clutch lets the housing tuck tightly to the transmission, moving the pump flange to the rear for improved clearance. Continuous-duty torque rating reaches 670 ft-lb, with intermittent torque exceeding 501 ft-lb. Shaft power is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common 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
Chelsea 890 Series, designed for Allison 3000 MD and 4000 HD Series transmissions
Hydraulic PowerShift (hot-shift) engagement
10-bolt mounting with SAE C (XS) output shaft
Wet Spline output extends PTO and pump shaft life in demanding conditions
Continuous-duty torque rating up to 670 ft-lb; intermittent torque exceeds 501 ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
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
- Outlet Flange Type: SAE C
- Continuous Torque Rating: 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 (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
- Lubricant: Wet Spline
Additional Information
The Chelsea 890HEFJW-G5XK is part of the 890 Series, a single-unit design - not a PTO with a separate extension. The one-piece main shaft removes the input splines found between a standard PTO body and an output extension, a common wear point. The rear-positioned clutch allows the gear housing to sit flush against the transmission, which positions the pump output at the rear of the transmission for adequate clearance between the pump and the frame rail. The 890 Series accommodates transmissions equipped with or without a cooler, a retarder, or both. Typical vehicle applications include aerial trucks, fire and rescue pumpers, refuse trucks, and truck cranes. Also referenced as SP890HEFJW-G5XK. Contact Pro Gear and Transmission to confirm the correct configuration for your transmission and pump setup.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
