The Chelsea 890 Series Power Take-Off, part number 890YAFJW-B5XS or 890YAFJWB5XS, 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 positions the pump output to the rear of the transmission, improving clearance between the pump and frame rail. The one-piece main shaft eliminates input splines between the PTO and the output extension, and the clutch is located at the rear of the housing to tuck the gear section tightly against the transmission. The SAE C output shaft uses Wet Spline Technology to extend pump shaft life in demanding duty cycles. Continuous torque rating reaches 670 ft-lb, with intermittent torque exceeding 501 ft-lb. Shaft power is rated at 64 HP at 500 RPM and 128 HP at 1,000 RPM. Call us to confirm proper fit for your application.
Features
Hydraulic PowerShift (hot-shift) operation for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with rear-of-transmission pump output location for improved pump-to-frame clearance
SAE C (XS) output shaft with Wet Spline Technology to extend PTO and pump shaft life
Continuous torque rating up to 670 ft-lb; intermittent torque exceeds 501 ft-lb
Shaft power output: 64 HP at 500 RPM, 128 HP at 1,000 RPM
One-piece main shaft design eliminates input splines between PTO housing and output extension
Tech Specs
- Transmission Application: Allison 3000 MD and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hydraulic Hot-Shift)
- Output Shaft Type: SAE C (XS) - Wet Spline
- Outlet Flange Type: SAE C
- Continuous Torque: 670 ft-lb (908 Nm) - check application pages for actual rating
- Intermittent Torque: 501+ ft-lb (501+ Nm)
- 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 PTO, not a PTO with a separate extension. Its clutch is positioned at the rear of the housing, allowing the gear section to sit tightly against the transmission body. This design is suited for aerial trucks, fire and rescue vehicles, snow and ice equipment, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required. The 890 Series can be configured for transmissions with or without a cooler, a retarder, or both. Part number 890YAFJW-B5XS or 890YAFJWB5XS is sold by Pro Gear and Transmission. Call us to confirm the correct fit for your specific transmission configuration.Parts manual and diagrams: Chelsea 890 Series PTO parts list with prices
