The Case Construction Genuine 51610692 Hydraulic Spool (1D [ML] / SD16-SDS180) is a precision-machined OEM internal component used within Walvoil directional control valve assemblies fitted on Case backhoe loaders. This spool regulates hydraulic oil flow and direction, ensuring smooth, controlled and proportional movement of machine functions.

Designed to Case Construction’s strict dimensional and surface-finish standards, the spool provides accurate metering, minimal internal leakage and long service life even under high pressure, frequent cycling and harsh operating conditions typical of construction equipment.

This spool is used across multiple functional sections of the machine, making it a critical part for consistent hydraulic performance:

Functional Applications

Used in Walvoil control valves (2-spool, 3-spool, 6-spool and 7-spool configurations) for:

• Loader bucket section
• Loader tilt bucket section
• Backhoe bucket section
• Boom section
• Dipper (arm) section

Replacing a worn or scored spool restores correct oil flow, eliminates jerky movements, prevents internal bypassing and helps maintain precise control response.

Replaces / Obsolete Part Numbers

This genuine part supersedes the following obsolete numbers:

• 3CU2510212
• 47937443

Key Features & Benefits

• Genuine Case Construction / CNH OEM component
• Part Number: 51610692
• Spool type: 1D [ML] / SD16-SDS180
• Designed specifically for Walvoil hydraulic control valves
• Compatible with multiple valve stack configurations
• Precision-ground surface for smooth spool movement
• Ensures accurate hydraulic flow and direction control
• Reduces leakage, vibration and erratic operation
• Direct OEM replacement – no modification required

Why Use Genuine OEM Spools?

• Maintains factory hydraulic response and safety
• Protects valve body from premature wear
• Extends life of cylinders and pumps
• Reduces downtime and costly valve replacements