K35*51*30 Needle Roller Bearing for Komatsu PC200-6 PC200-7 Excavator

Verified Via Official Apps — Every K355130 needle roller and cage assembly we dispatch carries a scannable code linked directly to the manufacturer's database, eliminating the risk of installing counterfeit components with soft inner rings into your excavator hydraulic pumps.

Technical Specifications

Application Suitability

Sourcing Authentic K355130 Needle Roller Bearing Supplier Options

Base number matching is not enough.

Procurement teams often approve replacements based solely on the dimensional footprint, only to face catastrophic cage fragmentation weeks later. When sourcing a reliable K355130 needle roller bearing supplier, ignoring the internal geometry and cage material specifications leads to thermal binding under the severe shock loads typical of earthmoving equipment . We intercept these cross-reference errors before the components ever reach your maintenance bay.

Aligning the K355130 with Excavator Hydraulics

Heavy machinery demands exact dimensional and structural alignment. As an authorized K355130 needle roller bearing supplier, we verify that the cage design and radial clearance match the specific hydraulic pump requirements of models like the PC200-7. This prevents the premature wear that occurs when generic substitutes are forced into high-cycle environments.

Shock Loads and Lubrication Starvation

Excavator hydraulic systems subject radial bearings to intense, fluctuating shock loads rather than steady rotation. The open design of this assembly relies entirely on the host system's oil bath or circulation for lubrication. If the hydraulic fluid becomes contaminated with particulate matter, the exposed rolling elements suffer rapid abrasive wear, making filtration and regular fluid analysis critical to preventing sudden pump seizure .

Decoding the K Series Assembly

The "K" prefix designates a needle roller and cage assembly without integrated inner or outer rings. This configuration relies on the shaft and housing bore to act as raceways, demanding strict adherence to surface hardness and roughness tolerances during installation. The with-cage design separates the rolling elements to minimize friction at higher rotational speeds, while the available P0 to P6 precision classes ensure the running accuracy required to prevent vibration-induced fatigue in the pump housing.

The Financial Impact of Incorrect Interchange

Substituting a full-complement bearing where a caged assembly is specified, or ignoring the required precision class, triggers a cascade of mechanical failures. According to ISO 281 life calculation frameworks, improper internal geometry alignment drastically reduces the dynamic load rating in practice. This results in unplanned downtime, secondary damage to the hydraulic pump shaft, and complete warranty voidance on the rebuilt component .

Why Our Engineering Review Matters

We do not just ship part numbers; we validate the application. When you request a K355130, our team checks the cross-reference against the specific OEM equipment number to ensure the cage material and precision suffix align with the original design. We consolidate mixed-brand requirements into single shipments with full batch traceability, eliminating the coordination delays that stall critical machinery repairs.

Documentation & Authenticity

• Certificate of Conformity matching the specific K355130 batch and lot numbers.
• Official app QR verification for instant authenticity checks on the job site.
• Material test reports confirming bearing steel hardness and composition.
• Dimensional inspection reports validating P5 or P6 running accuracy tolerances.
• Country-of-origin documentation for customs and project compliance.

Storage, Handling & Mounting

• Keep the K355130 in its original vapor-phase inhibitor packaging until the exact moment of installation to prevent raceway corrosion.
• Ensure the shaft and housing acting as raceways meet the required hardness before pressing the cage assembly into the bore.
• Use clean, lint-free gloves when handling the open needle roller assembly to prevent skin acids from etching the bearing steel.
• Verify the hydraulic fluid filtration system is operational before starting the pump, as the open design requires clean oil.
• Align the cage carefully during mounting to avoid bending the retaining tabs on the needle roller assembly.

Requesting Technical Validation

To ensure the selected assembly matches your exact machinery requirements, please provide the specific OEM equipment model, the hydraulic pump serial number, and the operating temperature range. Our engineering team will use these parameters to verify the cross-reference, confirm the necessary precision class, and validate the dynamic load capacity for your specific application.

Frequently Asked Questions

Q: Why must clearance and cage material be verified during cross-referencing?
A: Matching only the base dimensions ignores the internal geometry required for specific thermal and load conditions. Installing a standard clearance where thermal expansion demands a specific internal gap causes binding, while the wrong cage material fails under shock loads, leading to rapid pump seizure.

Q: How do I verify the authenticity of the K series assembly?
A: Every genuine component we supply features a traceable batch code. You can scan the QR label using the manufacturer's official mobile application to instantly verify the production origin, ensuring you are not installing counterfeit parts with soft, easily deformed inner raceways.

Q: What is the difference between P0 and P6 precision in this application?
A: P0 is the standard tolerance suitable for general applications, while P6 offers tighter dimensional and running accuracy limits. In high-speed excavator hydraulic pumps, P6 precision minimizes vibration and uneven load distribution across the needles, significantly extending the operational lifespan of the assembly.

Q: When should I choose a caged assembly over a full-complement design?
A: Caged assemblies are necessary when the application involves higher rotational speeds, as the cage prevents the needles from rubbing against each other. Full-complement designs handle heavier static loads but generate excessive friction and heat at higher speeds, making the caged version the correct choice for dynamic pump drives.

Q: What surface requirements exist for the shaft and housing?
A: Because the K design lacks inner and outer rings, the shaft and housing bore act directly as raceways. They must be hardened to the appropriate level and ground to a specific surface finish; otherwise, the rolling elements will rapidly wear down the softer host metal, causing catastrophic system failure.