The Chelsea 890 Series Power Take-Off, part number 890LHFJW-G5XK or 890LHFJWG5XK, is a hydraulic PowerShift PTO engineered specifically for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series relocates the pump mounting flange to the rear of the transmission, placing the output behind the gearbox to free up clearance between the pump and the frame rail. Unlike extension-based designs, the main shaft is a single one-piece unit with no intermediate input splines, and the clutch sits at the rear of the housing so the gear section tucks tight to the transmission. The SAE C output uses Wet Spline technology to extend pump shaft life under continuous load. Continuous-duty torque rating reaches 670 lb-ft, with intermittent torque rated at 501+ lb-ft. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Mounting is 10-bolt. Common applications include aerial trucks, fire and rescue, refuse, and truck cranes. Call us to confirm proper fit for your specific Allison transmission configuration.
Features
Hydraulic PowerShift (hot shift) engagement for Allison 3000 MD and 4000 HD Series transmissions
10-bolt mounting with SAE C outlet flange and SAE C (XS) output shaft
Single one-piece main shaft eliminates intermediate input splines for added durability
Clutch positioned at rear of housing, tucking gear section tight to transmission for improved pump clearance
Wet Spline output technology extends PTO and pump shaft life in high-demand cycles
Continuous-duty torque rating up to 670 lb-ft; shaft power 64 HP at 500 RPM and 128 HP at 1,000 RPM
Tech Specs
- Transmission Application: Allison 3000 MD Series 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
- Lubricant/Output Interface: Wet Spline
- Continuous Torque Rating: 670 lb-ft (908 Nm) - verify actual rating on application pages
- Intermittent Torque: 501+ lb-ft (501+ Nm)
- Output Power: 56+ HP (51+ kW)
- Shaft Power at 500 RPM: 64 HP (48 kW)
- Shaft Power at 1,000 RPM: 128 HP (95 kW)
Additional Information
The Chelsea 890 Series is designed for applications where pump space is limited and high continuous torque is required. It mounts like a standard side-mounted PTO but adds a support bracket at the rear of the transmission. The series is used on aerial trucks, fire and rescue vehicles, refuse trucks, pumper cleaners, and truck cranes. The 890 Series can be ordered to suit transmissions with or without a cooler, a retarder, or both - confirm your exact Allison transmission configuration before ordering, or call Pro Gear and Transmission for guidance.Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
