The Chelsea 890 Series Power Take-Off, part number 890XAFJW-B5ZS or 890XAFJWB5ZS, is a hydraulic hot-shift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and uses a one-piece main shaft that eliminates the input splines between the PTO and the output extension, positioning the clutch at the rear of the housing so the gear section tucks tightly against the transmission. The SAE C output shaft uses wet spline lubrication to extend pump spline life under demanding duty cycles. Continuous-duty torque is rated up to 670 ft-lb, with shaft power of 64 HP at 500 RPM and 128 HP at 1,000 RPM. This design is well suited to aerial trucks, fire and rescue apparatus, snow and ice equipment, and refuse trucks where pump space is limited and torque demand is high. 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 output shaft with wet spline lubrication to extend PTO and pump shaft life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft with rear-mounted clutch for improved pump clearance
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (hot-shift)
- Output Shaft Type: SAE C ("XS") with Wet Spline
- Outlet Flange Type: SAE C
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- Shaft Power: 64 HP at 500 RPM / 128 HP at 1,000 RPM
- Output Power: 56+ HP
- Product Series: 890
- Lubricant: Wet Spline
Additional Information
The Chelsea 890 Series is a single-unit design, not a PTO with a bolt-on extension. The one-piece main shaft eliminates the input splines between the PTO body and the output extension, and the clutch is positioned at the rear of the PTO housing so the gear section tucks tightly against the transmission case. This arrangement moves the pump mounting flange to the rear of the transmission, creating additional clearance between the pump and the frame rail. The unit can be ordered for transmissions equipped with or without a cooler, a retarder, or both. Typical applications include aerial lift trucks, fire and rescue pumpers, refuse trucks, truck cranes, and snow and ice equipment where high torque output and tight mounting envelopes are both required.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
