The Chelsea 890LAFJW-B5XK or 890LAFJWB5XK is a hydraulic PowerShift power take-off built specifically for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the pump output flange to the rear of the transmission, placing it between the transmission and frame rail to maximize clearance in tight installations. The one-piece main shaft eliminates input splines between the PTO and output extension, and the clutch sits at the rear of the housing so the gear section tucks tightly against the transmission. Output is SAE C with Wet Spline Technology to extend PTO and pump shaft life under demanding duty. Continuous-duty torque rating reaches 670 ft-lb, with intermittent torque above 501 ft-lb. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Common applications include fire and rescue trucks, aerial trucks, refuse trucks, and truck cranes. A genuine Chelsea 890 Series part from Pro Gear and Transmission. Call us to confirm proper fit for your specific transmission configuration.
The Chelsea 890 Series is a single-unit design, not a PTO with a bolt-on extension. The housing and gear section mount flush to the transmission side, while an additional bracket at the rear of the transmission provides supplemental support. This layout makes the 890 Series well suited for aerial trucks, fire and rescue units, snow and ice equipment, and any application where pump clearance and high continuous torque are the primary concerns. The series can be configured for transmissions equipped with a cooler, a retarder, both, or neither.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot shift) engagement
SAE C outlet flange with SAE C Wet Spline output shaft for extended pump spline life
Continuous-duty torque rating up to 670 ft-lb; intermittent torque above 501 ft-lb
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft and rear-mounted clutch position the PTO housing tightly against the transmission for improved pump clearance
Tech Specs
- Transmission Application: Allison 3000 MD and 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) Wet Spline
- Continuous Torque: 670 ft-lb (check application pages for actual torque ratings)
- Intermittent Torque: 501+ ft-lb
- 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 890 Series is a single-unit design, not a PTO with a bolt-on extension. The housing and gear section mount flush to the transmission side, while an additional bracket at the rear of the transmission provides supplemental support. This layout makes the 890 Series well suited for aerial trucks, fire and rescue units, snow and ice equipment, and any application where pump clearance and high continuous torque are the primary concerns. The series can be configured for transmissions equipped with a cooler, a retarder, both, or neither.
