The Chelsea 890RGFJW-B5XV or 890RGFJWB5XV is a hydraulic hot-shift power take-off built for Allison 3000 MD and 4000 HD Series transmissions. It mounts via a 10-bolt pattern and positions the SAE C output flange at the rear of the transmission, moving the pump mounting flange rearward for improved pump clearance compared to a standard side-mount PTO. The one-piece main shaft eliminates the input splines between the PTO body and the output extension, and Wet Spline technology protects the output shaft and pump drive spline under continuous load. Continuous-duty torque capacity reaches 670 ft-lb, with intermittent torque rated at 501+ lb-ft. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. Typical applications include aerial trucks, fire and rescue apparatus, refuse trucks, and truck cranes. Call us to confirm proper fit for your Allison transmission configuration.
The Chelsea 890 Series is designed as a single-unit PTO, not a PTO with a bolt-on extension. The housing and gear section tuck tightly against the Allison transmission, while the clutch assembly is positioned at the rear of the PTO to maintain clearance between the unit and the frame rail. This configuration is particularly well-suited for aerial trucks, fire and rescue apparatus, snow and ice equipment, and refuse trucks where pump space is restricted and high continuous torque is required.
The 890 Series can be configured for Allison transmissions equipped with a cooler, a retarder, both, or neither. Part number 890RGFJW-B5XV or 890RGFJWB5XV reflects the FJ input gear designator (Allison 3000 MD and 4000 HD Series) and the W wet-spline lubricant designation. Verify your transmission model and accessory configuration before ordering, or call Pro Gear and Transmission to confirm the right 890 Series part number for your truck.
Features
Fits Allison 3000 MD and 4000 HD Series transmissions via 10-bolt mounting
Hydraulic PowerShift (hot-shift) engagement for on-the-go operation
SAE C (XS) output flange with Wet Spline technology to extend PTO and pump shaft life
One-piece main shaft eliminates input splines between PTO body and output extension
Continuous-duty torque rating up to 670 ft-lb; intermittent torque 501+ lb-ft
Shaft power: 64 HP at 500 RPM, 128 HP at 1,000 RPM
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)
- Lubricant / Spline: Wet Spline
- Continuous Torque: 670 lb-ft (check application pages for actual torque ratings)
- Intermittent Torque: 501+ lb-ft
- Output Power: 56+ HP (51+ kW)
- Shaft Power: 64 HP (48 kW) at 500 RPM; 128 HP (95 kW) at 1,000 RPM
Additional Information
The Chelsea 890 Series is designed as a single-unit PTO, not a PTO with a bolt-on extension. The housing and gear section tuck tightly against the Allison transmission, while the clutch assembly is positioned at the rear of the PTO to maintain clearance between the unit and the frame rail. This configuration is particularly well-suited for aerial trucks, fire and rescue apparatus, snow and ice equipment, and refuse trucks where pump space is restricted and high continuous torque is required.
The 890 Series can be configured for Allison transmissions equipped with a cooler, a retarder, both, or neither. Part number 890RGFJW-B5XV or 890RGFJWB5XV reflects the FJ input gear designator (Allison 3000 MD and 4000 HD Series) and the W wet-spline lubricant designation. Verify your transmission model and accessory configuration before ordering, or call Pro Gear and Transmission to confirm the right 890 Series part number for your truck.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
