The Chelsea 890NGFJW-B3CF or 890NGFJWB3CF is a hydraulic PowerShift power take-off from the Chelsea 890 Series, built specifically for Allison 3000 MD and 4000 HD Series transmissions. It uses a 10-bolt mounting configuration and an SAE C ("XS") output flange, and the unit mounts at the side of the transmission with a rear-support bracket. The one-piece main shaft eliminates input splines between the PTO and the output extension, and the clutch locates at the rear of the housing so the gear section sits flush against the transmission for better frame-rail clearance. Wet-spline output technology protects the PTO and pump shaft in high-demand service. Continuous-duty torque rating reaches 670 lb-ft, with intermittent torque rated at 501+ lb-ft. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Typical applications include aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes. Call us to confirm proper fit for your specific chassis and transmission build.
Features
Hydraulic PowerShift (hot-shift) engagement for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with rear-support bracket; mounts like a standard side-mount PTO
SAE C ("XS") output shaft and SAE C outlet flange
One-piece main shaft eliminates input splines between PTO body and output extension
Wet-spline output technology extends pump shaft life in demanding duty cycles
Continuous-duty torque rating up to 670 lb-ft; intermittent torque 501+ lb-ft; shaft power 64 HP at 500 RPM and 128 HP at 1,000 RPM
Tech Specs
- Transmission Application: Allison 3000 MD Series and Allison 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") Output
- Lubricant/Spline: Wet Spline
- Continuous Torque: 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 (500 RPM) / 128 HP (1,000 RPM); 48 kW (500 RPM) / 95 kW (1,000 RPM)
Additional Information
The Chelsea 890 Series was engineered to address pump clearance limitations on Allison 3000 and 4000 Series transmissions. Unlike a standard PTO-plus-extension arrangement, the 890 Series is a single unit: its one-piece shaft eliminates the spline joint between the PTO body and the output extension, reducing a potential failure point. The clutch assembly is positioned at the rear of the PTO housing, allowing the gear section to tuck tightly against the transmission and keep the pump output rearward where frame-rail space is available. That rear-of-transmission pump location is the core design advantage for aerial lift trucks, fire apparatus, and other high-torque work-truck builds where underhood and mid-chassis space is constrained. The wet-spline output is standard on all 890 Series units, lubricating the pump drive spline continuously to extend service life under sustained hydraulic-system loads. For aerial, fire and rescue, refuse, and crane truck applications, this combination of extended clearance, high continuous torque, and spline protection makes the 890 Series a purpose-built choice. Contact Pro Gear and Transmission to verify the correct 890 Series part number for your specific Allison transmission configuration.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
