539-1899: 520.5mm Outer Diameter Bolt On Seal Ring

Cat 539-1899 is a Caterpillar Circlip for Shaft, also known as a retaining ring, used to fix the axial position of bearings, gears, and other components, preventing them from moving along the shaft. It is suitable for shaft end positioning in small to medium-sized machinery. Below are the core parameters and application information:

Core Parameters (Precise Version)

Item Details
Basic Information
Model 539-1899, type is Circlip for Shaft (GB/T 894.1 standard), made by stamping, has good elasticity, installed in the groove of the shaft, and achieves axial fixation by elastic clamping. Suitable for working conditions with speeds ≤3000rpm and no severe impact. Commonly used for shaft end positioning in gearboxes, hydraulic pumps, and motors.

Compatible Models
Compatible with Cat 305.5E2/306E2 excavators, 246D/242D skid steer loaders, C4.4/C6.6 engines, 420F2 engines. This product is commonly used in backhoe loaders and other applications, including hydraulic pump drive shafts, gearbox input shafts, bearing outer ring positioning, and gear shaft retaining rings.

Material and Manufacturing Process: Made of 65Mn spring steel, 1.5mm thick, quenched (hardness HRC42-48) + tempered, surface galvanized and passivated, achieving a corrosion resistance rating of no red rust after 48 hours of salt spray testing. Edges are deburred to prevent scratching the shaft and installation tools.

Key Dimensions: Inner diameter 45mm, outer diameter 52mm, thickness 1.5mm, groove diameter 48mm, groove width 1.7mm, opening width 3mm, weight approximately 0.02kg, dimensional tolerance ±0.1mm, elastic deformation ≤0.5mm, radial clamping force after installation ≥500N.

Matching Components: Compatible with 45mm diameter smooth shafts; matching installation tool is the 539-1899 special snap ring pliers (Cat 1U-0058). Recommended clearance between the pliers and the shaft groove. 0.05-0.1mm. During installation, ensure the retaining ring is fully engaged in the groove without any misalignment.

Function, Installation, and Maintenance Points

Core Function: Axial positioning and fixation, preventing displacement of shaft components (bearings, gears, washers, etc.) due to vibration or axial force, ensuring transmission system stability. Compact structure, easy installation and disassembly, suitable for space-constrained areas.

Installation Points: Use dedicated retaining ring pliers to open the retaining ring, align it with the shaft groove, and insert it. Release the pliers to tighten the retaining ring. After installation, check that the retaining ring fits snugly in the groove, without looseness or deformation. Avoid hammering, which could break the retaining ring.

Maintenance Points: Check the retaining ring’s elasticity and surface condition every 300 hours. Replace it immediately if deformation, cracks, rust, or insufficient clamping force are observed. Apply a small amount of anti-rust oil before installation to extend its service life.