The Chelsea 281GG Series Hotshift PTO with ISO direct mount and rotatable output is engineered for high-performance hydraulic systems requiring compact, direct-mounted pump solutions. Designed to suit Allison 3000 and 4000 Series transmissions, this PTO delivers powerful, smooth, and quiet operation even in the harshest working environments.

Unlike traditional flanged PTOs, this model features an ISO direct-mount interface, allowing you to mount the pump directly to the PTO — perfect for high-flow, high-pressure pumps where space is limited. The rotatable housing gives you full flexibility for alignment during install, making it ideal for tight chassis layouts.

Its Hotshift clutch pack is activated by a 12V solenoid, using transmission pressure to engage smoothly while the vehicle is running — ideal for continuous-duty applications.

Key Features:

• ISO direct mount output – For compact, high-performance pump mounting
• Rotatable housing – Allows easy alignment in tight spaces
• Compatible with Allison 3000 & 4000 Series transmissions
• Hotshift clutch design – Engage while vehicle is moving
• 12V solenoid operation – Uses transmission pressure for smooth activation
• Rated to 488Nm torque – Built for demanding hydraulic workloads
• Ideal for high-pressure, high-flow pumps in space-restricted builds
• Supplied with pressure hose and mounting kit for quick installation
• Made in the USA – Trusted Chelsea quality

Output Speeds:

• 3000 side/side openings: 1030rpm
• 3500 side/top openings: 1260rpm
• 4000 side/top openings: 1470rpm

Ideal Applications:

• Tippers
• Skip Trucks
• Hook Lifts
• Water carts and spray trucks
• Tilt Tray Trucks
• Any system needing direct pump mounting in tight chassis layouts

Need help matching your pump or transmission?
Our technical team can assist with compatibility checks and setup recommendations.