The Chelsea 890 Series Power Take-Off Assembly, part number 890HCFJW-B5ZS or 890HCFJWB5ZS, is a hydraulic hot shift PTO engineered for Allison 3000 MD and 4000 HD Series transmissions. The 890 Series uses a 10-bolt mounting configuration and positions the pump output flange at the rear of the transmission, moving it away from the frame rail to give hydraulic pumps adequate working clearance. The output shaft is SAE C (XS) type, lubricated via wet-spline technology to extend shaft and pump spline life under demanding duty cycles. Continuous-duty torque reaches up to 670 ft-lb, with intermittent torque rated at 501+ ft-lb. Shaft power output is 64 HP at 500 RPM and 128 HP at 1,000 RPM. The one-piece main shaft eliminates inter-spline input connections between the PTO and output extension. The clutch sits at the rear of the housing, allowing the gear section to tuck tightly against the transmission for a compact installation. Common applications include fire and rescue trucks, aerial units, refuse trucks, and truck cranes. Call us to confirm proper fitment for your specific Allison transmission configuration.
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 that exist between the PTO body and a separate output extension, reducing potential leak and wear points. The clutch is located at the rear of the PTO housing so the gear section sits flush against the transmission, keeping the overall installed profile compact. Typical platforms include aerial trucks, fire and rescue apparatus, snow and ice equipment, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required. The 890 Series accommodates Allison transmissions equipped with a cooler, a retarder, both, or neither.
Features
10-bolt mounting designed for Allison 3000 MD and 4000 HD Series transmissions
Hydraulic PowerShift (hot shift) engagement
SAE C (XS) output shaft with wet-spline lubrication for extended spline 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
Rear-positioned pump flange moves output away from the frame rail for improved pump clearance
Tech Specs
- Transmission Application: Allison 3000 MD Series and 4000 HD Series
- Product Series: 890
- Mounting Type: 10-Bolt
- Shift Type: Hydraulic PowerShift (Hot Shift)
- Output Shaft Type: SAE C (XS)
- Outlet Flange Type: SAE C
- Lubricant/Spline: Wet Spline
- Continuous Torque: Up to 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
- Part Number: 890HCFJW-B5ZS or 890HCFJWB5ZS
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 that exist between the PTO body and a separate output extension, reducing potential leak and wear points. The clutch is located at the rear of the PTO housing so the gear section sits flush against the transmission, keeping the overall installed profile compact. Typical platforms include aerial trucks, fire and rescue apparatus, snow and ice equipment, refuse trucks, and truck cranes where pump space is limited and high continuous torque is required. The 890 Series accommodates Allison transmissions equipped with a cooler, a retarder, both, or neither.
Parts Manual: Chelsea 890 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
