CAT 371-0658 1470mm Long Reflective Sleeve

CAT 371-0658 is a Caterpillar straight positioning sleeve, suitable for positioning the hinge pins of Cat 320D/323D excavator booms, 950GC loader rocker arms, and 140M grader blades. It is used to fix bearing positions, compensate for assembly clearances, and transmit radial loads. The following are the core technology and application information:

Core Technical Parameters
Item Details
Basic Attributes
Model 371-0658, type is straight positioning sleeve (no flange), suitable for Cat 320D excavator boom pins, 950GC loader rocker arm hinge points, and 140M grader blade pivots, material is 45# medium carbon steel (surface hardened HRC 45-50), operating temperature -40℃ to +120℃, single weight approximately 0.42 kg, suitable for grease lubrication, rated radial static load ≥50 kN, operating speed ≤100 rpm, wear life ≥3000 kN Small, without lubrication grooves or oil holes, used to position bearings and pins to prevent axial movement.

Key Dimensions: Inner diameter 76.20 mm (3.0 in, tolerance H7, +0.030/0 mm), outer diameter 85.00 mm (3.346 in, tolerance g6, -0.015/-0.035 mm), total length 38.10 mm (1.500 in, tolerance ±0.10 mm), wall thickness 4.40 mm, chamfered ends C1.5 mm, inner hole roughness Ra≤1.6 μm, no flange, fits standard pins, mounting hole surface roughness Ra≤1.6 μm.

Material and Manufacturing Process: 45 Medium carbon steel → forging → normalizing → rough turning → finish turning → quenching (840℃ water quenching) → tempering (200℃) → precision grinding → deburring → rust prevention treatment. Uniform surface hardness, impact resistant, suitable for medium load, low speed articulated positioning conditions.

Compatible models: Cat 320D/323D excavator boom/stick articulation point, 950GC/966K loader rocker arm/link pin, 140M/160M grader blade connecting pin, 420D skid steer loader working device articulation part. Used for positioning bearings, limiting pin axial displacement, and compensating for assembly clearance.

Assembly fit: Compatible with 76.20 mm diameter pins (tolerance f7, -0.030/-0.060 mm), 85.00 mm diameter mounting holes (tolerance H7, +0.030/0 mm), clearance fit 0.015-0.035. mm, press-fit installation, welding or heating deformation is prohibited.

Installation and Maintenance Points:

Before installation, clean the pin, mounting hole, and sleeve. Check for scratches and rust on the surface. Measure the inner diameter of the mounting hole and the outer diameter of the sleeve to ensure a clearance of 0.015-0.035 mm. The surface roughness of the hole Ra ≤ 1.6 μm.

Use a hydraulic press to press vertically, with a pressing force ≤ 60 kN. Ensure the sleeve end face fits snugly against the step of the mounting hole without skewing. After press-fitting, the inner hole roundness should be ≤ 0.02 mm. Do not strike the sleeve directly with a hammer.

Maintenance Recommendations: Check the clearance between the sleeve and pin every 1500 hours. Replace immediately if the radial clearance is > 0.2 mm or if loosening is observed. Lubricate daily in sync with the bearing using NLGI 2 lithium-based grease, replenishing grease every 250 hours.