Donaldson P166659 Hydraulic Filter Head Assembly

The Donaldson P166659 is a hydraulic filter head assembly from the Clean Solutions series, designed for use with HBK04 spin-on filters. This head assembly features robust aluminum construction with steel inserts to minimize metal-to-metal bonding and prevent galling between the head and filter during installation and removal.

Key Features:

• 1-11-1/2 inch NPT inlet and outlet port connections
• Integrated bypass valve with 25 PSI pressure setting (1.7 BAR)
• Fluorocarbon seals compatible with most hydraulic fluids
• Aluminum head construction for durability and corrosion resistance
• Overall height of 3.38 inches, head diameter of 4.08 inches
• Steel inserts prevent thread galling

This hydraulic head assembly is an essential component for maintaining clean hydraulic fluid in heavy-duty equipment applications. When combined with appropriate Clean Solutions filters, it helps ensure critical equipment receives properly filtered hydraulic fluid for optimal performance and longevity. Compatible with multiple filter cross-references including Caterpillar 3I0725, WIX 24001/24006MP, and NAPA 4001/4006MP.