380123-12 Hydraulic Solenoid Valve (12V) | Powershift PTO Cartridge | Fits 277, 278, 859 & 867 Series | Replaces DS563CS12M1

Restore Your "Hot Shift" PTO Engagement.The Genuine Parker Chelsea 380123-12 is the 12-Volt "heart" of your hydraulic PTO. Unlike mechanical PTOs, "Powershift" units use this solenoid to direct fluid pressure to the clutch pack.Is Your PTO Acting Up? If you flip the switch on the dash and hear a click, but the PTO does not engage (or if it engages sluggishly), the solenoid cartridge is often clogged or the coil has failed. Restoring it with this Genuine Parker valve ensures proper pressure modulation.Designed for Allison Transmission PTOs: This valve fits the large-body Hot Shift units: 277 / 278 Series: 10-Bolt Mounting (Common on Allison 3000/4000) 859 / 867 Series: 8-Bolt Mounting (Common on Heavy Vocational Trucks)Technical Specifications: Voltage: 12 Volts DC Type: Cartridge Solenoid Part Number: 380123-12Note: Does NOT fit 230/270 Series (6-Bolt) PTOs. Please verify your data tag starts with 277, 278, 859, or 867.

• GENUINE PARKER CHELSEA OEM: Genuine Part Number 380123-12. The original equipment 12-Volt solenoid cartridge valve designed specifically for Chelsea "Powershift" PTO units mounted on Allison World Transmissions.
• VERIFIED COMPATIBILITY: Fits Chelsea 277 & 278 Series (10-Bolt) and 859 & 867 Series (8-Bolt) Hot Shift PTOs. These are the heavy-duty units commonly found on Refuse Trucks, Fire Trucks, and Dump Trucks with Allison Automatics.
• SOLVES "NO ENGAGE" ISSUES: This solenoid controls the hydraulic pressure required to compress the clutch pack. If your PTO switch is on but the shaft won't spin (or is stuck spinning), this valve is the primary failure point.
• HEAVY-DUTY CARTRIDGE DESIGN: Features precision-machined steel internals and high-temp O-rings to withstand the heat cycles of mobile hydraulic systems. Designed to resist coil burnout even during prolonged PTO operation.
• DIRECT INTERCHANGE: Exact replacement for Parker Chelsea 380123-12, 38012312, and DS563CS12M1. Plugs directly into your existing harness (connector color is typically White or Black depending on vintage—verify shape before ordering).