2446u436s3 Filter Case Assy

Product Overview

The 2446U436S3 Filter Case Assy is a critical hydraulic system component for Kobelco SK460-8, SK480-8, and SK495D-8 large excavators. This filter housing assembly, also known as a hydraulic oil filter case or filter canister assembly, encloses and secures the main hydraulic system filter element, ensuring that hydraulic oil is properly filtered before circulating through pumps, control valves, and actuators.

The Kobelco SK460-8, SK480-8, and SK495D-8 are 46-50 ton class large excavators used in heavy construction, mining, quarrying, and mass excavation applications. These machines feature high-flow hydraulic systems operating at pressures up to 350 bar (5,000 PSI) with flow rates exceeding 500 L/min . The filter case assembly is a vital component that protects the hydraulic system from contamination, which is the leading cause of pump and valve failure.

The filter case housing is typically mounted on the hydraulic tank or in the return line circuit. It contains the filter element and includes features such as a bypass valve to prevent starvation if the filter becomes clogged, and a drain port for service access. When the filter case becomes damaged due to impact, corrosion, or seal failure, replacing the complete assembly restores proper filtration and prevents contamination from entering the hydraulic system .

Key Features

• Heavy-Duty Construction: Manufactured from high-strength materials capable of withstanding the high operating pressures of large excavator hydraulic systems.

• OEM Specification Compliance: Designed to meet exact Kobelco dimensional and performance specifications for SK460-8, SK480-8, and SK495D-8 models.

• Complete Housing Assembly: Includes the filter case body, mounting flange, seal groove, bypass valve assembly, and drain port.

• Integrated Bypass Valve: Engineered to open when the filter element becomes clogged, allowing oil to bypass and preventing cavitation damage to the hydraulic pump.

• Corrosion-Resistant Finish: Treated to resist rust and corrosion from moisture, hydraulic fluid, and job site contaminants.

• High-Pressure Capability: Rated for the full operating pressure of the excavator’s hydraulic system (typically 350 bar / 5,000 PSI).

• Seal Compatibility: Designed to accept OEM-spec O-rings and gaskets for leak-free operation.

• Direct Replacement: Bolt-on fitment for straightforward installation.

Compatibility

This filter case assembly is a direct replacement for the following Kobelco excavator models:

Large Excavator Models

• Kobelco SK460-8

• Kobelco SK480-8

• Kobelco SK495D-8

Part Number: 2446U436S3

Also Known As: Filter Case Assy, Hydraulic Oil Filter Housing, Filter Canister Assembly, Return Filter Housing, Suction Filter Case

Please verify your machine’s serial number and hydraulic system configuration before purchasing to ensure correct fitment.

Filter Case Location and Function

Hydraulic System Position

The filter case assembly is typically located in one of two positions:

• Return Line Filter: Installed in the return line circuit to filter oil returning from the control valve to the tank

• Suction Line Filter: Installed between the hydraulic tank and pump inlet to protect the pump

Critical Functions

1. Houses Filter Element: Securely contains the replaceable hydraulic filter element

2. Maintains System Cleanliness: Ensures all hydraulic oil passes through the filter media

3. Bypass Protection: Built-in bypass valve opens if filter clogs, preventing pump starvation

4. Service Access: Provides access point for routine filter element changes

5. Contamination Control: Prevents debris from circulating through pumps, valves, and cylinders

Signs Your Filter Case Assembly Needs Replacement

The filter case assembly can fail due to impact damage, corrosion, seal failure, or thread damage. Replace your 2446U436S3 filter case if you observe:

1. External Hydraulic Leaks: Visible oil leaking from the filter case body or mounting interface indicates cracks or seal failure.

2. Damaged Threads: Stripped or cross-threaded filter bowl threads prevent proper filter element installation and sealing.

3. Cracked Housing: Visible cracks in the filter case body due to impact or material fatigue.

4. Corrosion: Severe rust or corrosion compromising the structural integrity of the housing.

5. Bypass Valve Malfunction: The bypass valve sticks open (allowing unfiltered oil to circulate) or sticks closed (causing pressure spikes).

6. Filter Element Won’t Seal: New filter elements fail to seal properly, allowing oil to bypass the filter media.

7. After Impact Damage: If the filter case has been struck by debris or during component removal/installation.

8. Frequent Filter Clogging: May indicate debris from a deteriorating filter case is contaminating the element.

Benefits

Why choose our 2446U436S3 Filter Case Assembly for your Kobelco large excavator?

1. Protects Expensive Hydraulic Components: A properly sealed filter case ensures that all hydraulic oil is filtered, protecting pumps, control valves, and cylinders from contamination damage.

2. Prevents Costly Hydraulic Failures: Contamination is the leading cause of hydraulic pump and valve failure. A quality filter case assembly is essential for system protection.

3. Eliminates External Leaks: Replaces a cracked or corroded housing that may be leaking valuable hydraulic fluid onto the job site.

4. Restores Bypass Valve Function: Ensures the bypass valve operates correctly, protecting the hydraulic pump from starvation if the filter becomes clogged.

5. Ensures Proper Filter Sealing: A new housing with undamaged threads and seal surfaces ensures the filter element seals properly.

6. Extends Hydraulic System Life: Maintaining proper filtration extends the service life of all hydraulic components.

7. Compatible with OEM Elements: Designed to accept standard Kobelco filter elements for easy maintenance.

8. Direct Replacement: Engineered for bolt-on fitment without modifications.

SK460-8, SK480-8, SK495D-8 Overview

These Kobelco large excavators are designed for heavy-duty applications:

All three models feature sophisticated high-pressure hydraulic systems that rely on clean oil for reliable operation . The filter case assembly is a critical component for maintaining hydraulic system cleanliness and preventing contamination-related failures.

Maintenance Recommendations

Routine Service

• Replace Filter Elements: Follow the OEM service interval for hydraulic filter element replacement (typically 500-1,000 hours)

• Inspect Filter Case: Check for leaks, cracks, or damage during each filter change

• Clean Mounting Surface: Ensure the filter case mounting surface is clean before installing a new element

• Replace Seals: Install new O-rings or gaskets with each filter change

When to Replace the Filter Case

• Visible corrosion or pitting on sealing surfaces

• Cracked or dented housing

• Stripped threads on the filter bowl or mounting stud

• Persistent leaks that cannot be resolved with new seals

Installation Tips

• Professional Installation Recommended: Filter case replacement involves draining hydraulic oil and accessing the hydraulic tank. Professional installation by qualified technicians is recommended.

• Relieve Hydraulic Pressure: Before starting work, operate the machine with the engine off to relieve trapped hydraulic pressure.

• Drain Hydraulic Oil: The hydraulic tank must be drained below the filter case mounting level.

• Clean the Area: Thoroughly clean the exterior of the filter case area before removal to prevent contamination.

• Inspect Mounting Surface: Check the hydraulic tank mounting surface for damage or debris before installing the new filter case.

• Use New Seals: Always install new O-rings or gaskets when installing a replacement filter case.

• Tighten to Specification: Follow the service manual torque specifications for mounting bolts to prevent leaks or damage.

• Fill and Bleed: After installation, refill hydraulic oil and properly bleed air from the system.

• Test for Leaks: Run the machine and check for leaks around the filter case installation.

Why Choose Our 2446U436S3 Filter Case Assembly?

We understand that Kobelco SK460-8, SK480-8, and SK495D-8 excavators are large, high-production machines operating in demanding environments. The hydraulic system is the heart of these machines, and contamination control is critical for reliability and uptime.

Our 2446U436S3 Filter Case Assembly is manufactured to strict quality standards with high-strength materials and precision-machined sealing surfaces. Whether you are replacing a damaged filter case, addressing a persistent hydraulic leak, or performing a major hydraulic system overhaul, this direct-fit assembly provides the reliable filtration housing your Kobelco large excavator requires.

Technical Specifications

Order your 2446U436S3 Filter Case Assembly today and ensure reliable hydraulic filtration for your Kobelco SK460-8, SK480-8, or SK495D-8 excavator. In stock and ready for immediate worldwide shipping. Bulk pricing available for fleet maintenance.