The Chelsea 890 Series Power Take-Off, part number 890RDFJW-D5XY or 890RDFJWD5XY, is a hydraulic hot-shift PTO built specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts with a 10-bolt pattern and positions the SAE C output flange toward the rear of the transmission, moving the pump mounting point aft for improved clearance between the pump and the frame rail. The one-piece main shaft eliminates input splines between the PTO body and the output extension, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Wet-spline technology lubricates the output shaft interface, reducing wear in high-demand cycles. Continuous-duty torque capacity reaches 670 ft-lbs, with intermittent torque rated at 501+ ft-lbs. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Typical applications include aerial trucks, fire and rescue units, 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 mount
Hydraulic PowerShift (hot-shift) engagement
SAE C ("XS") output shaft and outlet flange
One-piece main shaft eliminates spline joint between PTO body and output extension
Wet-spline output lubrication extends PTO and pump shaft service life
Rear-positioned pump flange improves clearance between pump and frame rail
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot shift)
- Outlet Flange Type: SAE C
- Output Shaft Type: SAE C ("XS") Output
- Lubricant / Spline Type: Wet Spline
- Continuous Torque: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque: 501+ lb-ft
- Shaft Power: 64 HP at 500 RPM / 128 HP at 1,000 RPM
- Output Power: 56+ HP
Additional Information
The Chelsea 890 Series mounts like a standard side-mounted PTO but adds a rear bracket at the back of the transmission for additional support. Unlike a PTO-plus-extension combination, the 890 Series is a single integrated unit. The rear-mounted clutch design lets the housing and gear section sit close to the transmission, preserving clearance space for the pump. This layout suits high-torque, space-constrained installations on aerial trucks, fire and rescue apparatus, pumper cleaners, truck cranes, and refuse trucks. The 890 Series accommodates transmissions equipped with or without a cooler, a retarder, or both - confirm your transmission configuration before ordering.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
