CAT 477-1420 RETAINER

CAT 477-1420 (4771420) is a Caterpillar original spring pin retainer, adapted for engine valve mechanisms and hydraulic pump housing positioning. The following is purely precise information (no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 477-1420 Spring Pin Retainer

Part Type: Cylindrical spring pin retainer, used to secure valve tappets, hydraulic pump end caps, gearbox shift forks, etc., bearing axial positioning loads and preventing parts from loosening or falling off.

Material: 65Mn spring steel, surface anodized blackened, hardness HRC45-50, elastic recovery rate ≥95%, shear strength ≥900 MPa

Key Dimensions: Outer diameter 12.70 mm, inner diameter 10.00 mm, length 25.40 mm, pin wall thickness 1.35 mm, chamfers at both ends 0.5×45°, tolerance ±0.03 mm
Structural Features: Hollow cylinder with longitudinal opening; relies on elastic contraction/expansion to engage with the mounting hole for interference fit; no threads/snap fasteners, easy installation and disassembly.

Compatible Structures: Compatible with engine valve cover, hydraulic pump housing positioning holes, gearbox shift fork shaft fixing slots, and small bearing end cap positioning.
Applicable Working Conditions: Suitable for positioning scenarios with temperatures ranging from -40℃ to 150℃, low to medium speeds (≤3000 r/min), and no strong impacts; static axial positioning load ≤8 kN.
Compatible Models:
CAT C4.4/C6.6 engines (valve tappet fixing, rocker arm shaft positioning pins)
CAT 320GC/323GC excavators (hydraulic pump housing fixing pins, swing motor end cap positioning pins)
CAT 950GC/966M loaders (gearbox shift fork shaft fixing, drive shaft bearing seat positioning)
CAT 140M graders (hydraulic cylinder end cap fixing, steering knuckle positioning pins)
Installation and Fitting Points: Compatible mounting hole diameter The pin diameter is 12.75-12.85 mm, and the hole depth is 25.50-25.60 mm. The retainer and hole have an interference fit, ensuring no looseness or axial movement after installation.

Use a special punch to vertically press the pin into the mounting hole. Do not strike either end of the pin to prevent deformation or cracking.

Before installation, clean the mounting hole to remove burrs and oil stains. Inspect the retainer for cracks, deformation, good elasticity, and no surface rust.

After installation, the end face of the retainer should be flush with the mounting surface, with an exposed length ≤0.1 mm. The fixed parts should have no axial displacement, and the radial clearance ≤0.02 mm.

Apply anti-rust oil to the surface of the retainer to reduce installation friction and long-term fretting wear.