MPV046 90R/75 Hydraulic Pump Spare Parts - Oil Seals
I. Types and Characteristics of Oil Seals
1. Lip-Type Seals
• Structure: Rely on the lip to tightly contact the sealing surface, generating contact stress through elastic deformation. The sealing effect automatically enhances as oil pressure increases.
• Applications: Hydraulic cylinders under high pressure, variable pressure, and rapid motion (e.g., YX-type seals).
• Advantages: Low friction resistance, excellent pressure resistance, stable operation, and long service life.
2. Composite Seals
• Structure: Combine rubber (e.g., O-rings) with polytetrafluoroethylene (PTFE) layers (e.g., Glyd Ring, Step Seal).
• Sealing Mechanism: Rubber provides initial contact stress, while the PTFE layer enhances sealing under high pressure.
• Advantages: Significantly improved pressure resistance, suitable for high-pressure environments.
3. Self-Sealing Compression-Type Seals
• Structure: Generate initial contact stress through radial compression (e.g., O-rings).
• Limitations: Require backup rings under high pressure to prevent material extrusion into sealing gaps.
II. Compatibility of MPV046 90R/75 Hydraulic Pump Oil Seals
1. Model Matching
• MPV046 hydraulic pumps typically useO-rings, YX-type seals, Glyd Rings, etc. Selection depends on the pump’s seal groove dimensions.
• For 90R/75 models (potentially high-pressure applications), prioritizecomposite seals(e.g., Step Seals) or self-sealing types with backup rings.
2. Material Requirements
• Oil Resistance: Must be compatible with hydraulic fluids to avoid swelling, dissolution, or embrittlement.
• Temperature Resistance: Typically suitable for -50°C to 260°C.
• Pressure Resistance: Up to 700 kg/cm² (10,000 psi), meeting high-pressure pump demands.
IV. Selection and Installation Guidelines
1. Key Selection Criteria
• Operating Conditions: Prioritize composite seals for high-pressure environments; self-sealing types for low-pressure applications.
• Dimensional Accuracy: Seal groove dimensions must strictly match the oil seal’s outer diameter and lip diameter.
• Material Compatibility: Confirm compatibility with hydraulic fluid types (e.g., mineral oil, synthetic oil).
2. Installation Precautions
• Cleanliness: Thoroughly clean the seal groove and oil seal before installation to prevent leaks caused by contaminants.
• Lubrication: Apply dedicated grease to the seal lip to reduce friction.
• Orientation: Ensure the lip faces the side requiring sealing to avoid reverse installation.
V. Common Issues and Solutions
1. Leakage Problems
• Causes: Aged seals, improper installation, or excessive pressure.
• Solutions: Replace the oil seal, verify seal groove dimensions, and adjust system pressure.
2. Rapid Wear
• Causes: Abrasive materials or harsh operating conditions.
• Solutions: Use wear-resistant materials (e.g., PTFE composites) and improve hydraulic system cleanliness.
