AR1666 gearboxes are designed to safely connect pumps and power supplies that operate at different speeds. Gearbox fit into ¾" shaft, to support 5.5-6.5HP gas engines. New pinion design eliminates key wear, and aids ease of service. Intended for medium pumps for fitment to gas engine. 

For models AR30 (D30), AR40, AR50 (D50), AR303 (D303), AR403 (D403) and AR503 (D503)

Enhanced Features for Optimal Performance

The AR1666 gearbox have been meticulously designed to tackle the most persistent challenges in gearbox maintenance. With an emphasis on ease of service, these models feature: 

• Improved pinion Alignment: Ensures a snug fit, significantly reducing vibration and minimizing key wear. 
• Simplified Disassembly Process: Facilitates quicker and more efficient maintenance operations, addressing the common issues caused by engine movement that can lead to premature wear of keys and shafts. 

These advancements not only facilitate a smoother maintenance experience but also contribute to superior head dissipation, extending the operational lifespan of gearboxes. 

Download Product Manual

• Gear ratio: 6:01
• Max RPM 500
• Series: AR30/AR40/AR50/AR303/AR403/AR503
• Reduction: 6:1
• Flange Size: ¾"
• Pump RPM: 500
• Oil Type: 80/90 Gear, 90W
• Oil Capacity (oz.): 16