CAT 425-0694 165mm Inner Diameter Sleeve Bearing

CAT 425-0694 is a Caterpillar genuine hydraulic cylinder-specific straight-tube sleeve bearing (also known as a bushing/bearing shell). It is suitable for guiding and supporting pistons in heavy-duty hydraulic cylinders, used to reduce friction between the piston and the cylinder wall and absorb reciprocating impacts. The following is pure raw data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 425-0694, Type: Steel-backed copper-lead alloy straight sleeve bearing, suitable for hydraulic cylinder piston guide, Single weight 8.2 kg, Operating temperature -40℃ to +120℃, Suitable for anti-wear hydraulic oil and general-purpose lithium-based grease, used for heavy-duty hydraulic cylinder piston support, reducing reciprocating friction and impact, extending cylinder and piston life.

Key Dimensions (Metric / Imperial)
Inner diameter 165.0 mm (6.496 in, tolerance 0/-0.020 mm), Outer diameter 180.0 mm (7.087 in, tolerance ±0.05 mm), Overall length 150.0 mm (5.906 in, tolerance ±0.15 mm), Steel backing thickness 4.0 mm, Alloy layer thickness 1.0 mm, Chamfers at both ends 2×45°, Piston fit tolerance h9, Cylinder fit tolerance H7

Performance Parameters The steel backing has a tensile strength ≥550 MPa, an alloy layer hardness of HB 75-95, a friction coefficient ≤0.10, a load-bearing capacity ≥200 MPa, and a wear life ≥8000 hours. It is suitable for reciprocating speeds ≤0.5 m/s and can withstand high-frequency reciprocating impact loads. It is resistant to corrosion from hydraulic oil and grease in engineering machinery.

Structure and Adaptability Characteristics:

Composite Friction-Reducing Structure: The steel backing provides rigid support, while the copper-lead alloy layer buffers reciprocating impacts. It is suitable for the high-frequency reciprocating motion of hydraulic cylinder pistons, reducing wear between the cylinder inner wall and the piston, and improving cylinder operating stability.

Reciprocating Guide Adaptation: The straight cylindrical structure precisely matches the piston outer circle, providing a guiding function to ensure linear piston movement within the cylinder, preventing uneven wear. It is suitable for heavy-duty hydraulic cylinders under high load conditions.

Ease of Installation: Cold-pressed into the piston mounting slot, no additional fixing is required. After installation, it moves synchronously with the piston and is lubricated by hydraulic oil within the cylinder, suppressing early wear caused by dry friction.

Installation and Maintenance Points (Original Data)

Installation: Clean the sleeve bearing and piston mounting groove (free of oil and metal filings). Use a press to cold-press into place with a pressing force ≤150 kN. Ensure the bearing end face is flush with the piston groove surface, coaxiality ≤0.08 mm, and clearance with the cylinder 0.05-0.12 mm.

Maintenance: Check bearing wear and cylinder leakage every 1000 hours. Replace bearings immediately if wear ≥1.5 mm or alloy layer peeling. For long-term storage, apply rust-preventive oil and seal to prevent bearing corrosion.