CAT 599-6507 PLUNGER

CAT 599-6507 is a ceramic-coated plunger for Caterpillar high-pressure hydraulic pumps, used for high-pressure fluid delivery in main/pilot pumps. It is compatible with the hydraulic systems of various excavators and loaders. The following is structured technical and application information.

Core Technical Parameters

Item Details
Basic Attributes Model 599-6507, Type: Ceramic Coated Plunger, Material: Carbon Steel Matrix + Zirconia Ceramic Coating, Weight: Approx. 0.85 kg, Applicable Pressure: 40-45 MPa, Applicable Temperature: -25℃ to +110℃, Applicable Medium: Cat TO-4 Hydraulic Oil, Surface Hardness: HRC 70-75, Coating Thickness: 0.15-0.20 mm

Key Dimensions Plunger Diameter: 32 mm (Tolerance f7), Length: 180 mm, Head Ball Radius: R16 mm, Sealing Groove Width: 5 mm, Depth: 1.5 mm, Rod Roughness: Ra≤0.2 μm, Coaxiality: ≤0.005 mm, Roundness: ≤0.003 mm

Compatible Models and Parts Compatible with Cat 336GC/349GC Excavator Main Pump (353-9845), 980M Loader hydraulic pump (299-7075), 140M grader pilot pump, 6 units per pump, plunger-cylinder clearance 5-8 μm, rated life ≥8000 hours

Performance Parameters: Rated flow rate compatible with 380 L/min pump, allowable speed ≤0.5 m/s, leakage ≤0.3 mL/min (45 MPa), ceramic coating adhesion ≥50 N, tensile strength ≥900 MPa, impact resistance ≥10 J/cm², corrosion resistance grade ISO 9227 Class 10

Structural and Performance Advantages:
Ceramic Coating Technology: Zirconia ceramic coating has high hardness and strong wear resistance, reducing the coefficient of friction with the cylinder (≤0.002), reducing wear and leakage, suitable for high-pressure, high-frequency reciprocating conditions, and extending service life by 3-5 times compared to ordinary plungers.

Precision Dimension Control: Plunger diameter tolerance f7, coaxiality ≤0.005 mm, ensuring precise fit with the cylinder block and distributor plate, stabilizing high-pressure sealing performance, and reducing pressure fluctuations.

High Compatibility: Compatible with multiple Cat high-pressure hydraulic pumps, no adjustment required during installation. The ceramic coating is compatible with Cat TO-4 hydraulic oil, resisting oil contamination and aging, and suitable for extreme temperature conditions.

Reliable Sealing Design: Optimized head ball radius R16 mm and sealing groove dimensions, compatible with dedicated sealing rings, improving sealing reliability and reducing the risk of high-pressure leakage.

Installation and Maintenance Points: Clean the plunger and cylinder block before installation, check the ceramic coating for scratches and chipping, use a special tool for installation to avoid impact, apply hydraulic oil for lubrication, ensure a fit clearance of 5-8 μm, and test the pump pressure and flow rate after installation to ensure they are normal.

Maintenance Cycle: Inspect coating wear every 1000 hours, replace seals every 2000 hours, measure clearance every 4000 hours, and replace the plunger if clearance exceeds 12 μm. Regularly change hydraulic oil and filter elements (cleanliness ISO 18/15).

Common Faults and Solutions: Increased leakage indicates coating wear or excessive clearance, requiring plunger replacement; plunger sticking indicates hydraulic oil contamination or excessively high oil temperature, requiring oil and filter replacement and temperature control; insufficient pressure indicates plunger seal failure, requiring seal replacement or plunger replacement.