CAT 614-4602 Straight Sleeve Bearing

CAT 614-4602 is a Caterpillar powder metallurgy steel straight sleeve bearing (bushing) specifically designed for hinged parts such as the stick and thumb link in mini excavators. It is used to constrain movement, guide support, and reduce friction between the pin and the link hole, suitable for low-speed oscillation and medium-load conditions. The following is the structured core information:

Core Parameters
Item Details
Basic Attributes
Model 614-4602, straight, flangeless sleeve bearing, suitable for the hinge pin of the stick and thumb link in mini excavators, used for radial support and oscillation guidance, no grease hole, relies on pin lubrication, suitable for low-speed oscillation conditions (≤15 times/minute)

Compatible Models
Cat 301.5/301.6/301.7/301.8/301.9/302 mini excavators, suitable for Cat® Parts for hinged parts such as the stick and thumb link

Material & Process
Powder metallurgy steel (PM) Steel base material, sintered and densified, with surface pores for oil storage, hardness HB 220-260, dimensional tolerances conforming to Caterpillar engineering standards, excellent wear resistance and anti-seize properties.

Key Dimensions: Inner diameter 39.93mm (1.58in), outer diameter 30.00mm (1.18in), length 45.00mm (1.77in), wall thickness approx. 5.0mm, compatible pin diameter 39.93mm (h8 tolerance), mounting hole diameter 30.00mm (H7 tolerance), weight approx. 0.154kg (0.34lb) Cat® Parts

Functional Parameters: Radial load ≤12kN, coefficient of friction ≤0.12 (oil lubrication), operating temperature -30℃ to +100℃, suitable for medium load, non-severe impact oscillating conditions, requires regular grease replenishment (every 200 hours).

Matching Components: Compatible pin diameter… 39.93mm, matching sealing ring 4T-0522, retaining ring 1W-7020. Installation requires special press-fitting fixtures.

Installation and Maintenance Points

Preparation before installation: Clean the mounting hole and pin surface, removing burrs and oil stains; check the roundness of the mounting hole ≤0.02mm, and the interference fit between the bearing and the mounting hole 0.015-0.025mm; use a hydraulic press and special fixtures, and strictly prohibit striking the bearing end face to avoid deformation.

Installation steps: Smoothly press the bearing into the mounting hole until it is in place, ensuring that the bearing end face is flush with the connecting rod hole end face; install the pin and check its flexibility, axial clearance ≤0.3mm; after installation, inject lithium-based grease (NLGI 2) to ensure sufficient oil retention in the orifice.

Maintenance and Replacement: Add grease every 200 hours, check bearing wear every 2000 hours, and replace when the inner diameter wear exceeds 0.5mm or when peeling or cracks appear on the surface; avoid dry friction operation of the pin shaft to prevent bearing burn-out.