The Chelsea 890 Series Power Take-Off, part number 890NDFJW-D3ZS or 890NDFJWD3ZS, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series uses a one-piece main shaft that eliminates input splines between the PTO body and the output extension, placing the clutch at the rear of the housing so the gear section tucks tightly against the transmission for improved pump clearance. Output is SAE C ("XS") with wet-spline lubrication to protect pump shaft splines under continuous demand. The 10-bolt mounting pattern fits like a standard side-mounted PTO while an additional rear bracket provides extra support. Shaft power reaches 64 HP at 500 RPM and 128 HP at 1,000 RPM. Continuous torque is rated up to 670 lb-ft; intermittent torque exceeds 501 lb-ft. Common applications include aerial trucks, fire and rescue, refuse trucks, and truck cranes. Call us to confirm proper fit for your application.
Features
Product Series: Chelsea 890 Series Power Take-Off
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") output with wet-spline lubrication to extend pump shaft life
One-piece main shaft with clutch located at rear for maximum pump clearance
Continuous-duty torque rating up to 670 lb-ft; shaft output 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
- Output Shaft Type: SAE C ("XS")
- Outlet Flange Type: SAE C
- Lubricant/Output: 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 (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
Additional Information
The Chelsea 890 Series is a single-unit design, not a PTO paired with a bolt-on extension. The one-piece main shaft eliminates the spline joint between the PTO body and the output, and the clutch housing is positioned at the rear of the unit so the gear section sits as close as possible to the transmission. This geometry moves the pump mounting flange rearward, creating clearance between the pump and the frame rail - a critical advantage on aerial trucks, fire and rescue apparatus, snow and ice equipment, and refuse trucks where space is limited and torque demand is high. The wet-spline output bathes the pump shaft splines in lubricant, reducing wear in high-cycle applications. The 890 Series accommodates Allison transmissions equipped with a cooler, a retarder, both, or neither.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
