CAT 526-9326 General Duty Sleeve Bearing

CAT 526-9326 GD is a Caterpillar General Duty steel-backed bronze composite sleeve bearing (bushing), suitable for medium-to-light load hinge parts such as the 320D excavator stick pin, the 950GC loader boom hinge point, and the 140M grader blade pivot. It is used to reduce oscillation/rotational friction and wear. The following are the core technology and application information for Cat® Parts:

Core Technical Parameters
Item Details
Basic Attributes
Model 526-9326 GD (General Duty), type is a straight-tube steel-backed bronze composite sleeve bearing, suitable for 320D/323D excavator stick/boom pins, 950GC loader boom pivot, and 140M grader blade connecting pin; material is steel back + sintered bronze layer + PTFE self-lubricating coating; operating temperature -40℃ to +120℃; weight approximately 0.85 kg/m³. kg, suitable for grease lubrication, rated radial load ≥25 kN, static load ≥60 kN, wear life ≥5000 hours, rust prevention grade IP54

Key Dimensions: Inner diameter 70.17 mm (tolerance H7, +0.030/0 mm), outer diameter 85.00 mm (tolerance g6, -0.015/-0.030 mm), total length 50.00 mm (tolerance ±0.15 mm), steel backing thickness 3.0 mm, bronze layer thickness 2.0 mm, PTFE coating thickness 0.05 mm, inner hole roughness Ra≤0.8 μm, chamfer at both ends r=1.0 mm, no internal or external lubrication grooves

Material and Process: Low carbon steel backing → sintered porous bronze layer → impregnation with PTFE mixed filler → precision machining of inner and outer diameters → deburring → cleaning and rust prevention, self-lubricating design, no need for high-frequency grease replenishment, suitable for medium and low speed (≤5 m/s), medium and light load oscillation / Suitable for rotating operation, resistant to impact and vibration.

Compatible with: 320D/323D/326D excavator boom/swing hinge points; 950GC/966K loader rocker arm/swing pivot; 140M/160M grader blade/draw frame connecting pins; 420D/432D skid steer loader working device pins. Used for swing support at hinged joints, reducing wear between pins and the frame.

Assembly fit: Compatible with 70.17 mm diameter pins (tolerance f7, -0.030/-0.060 mm), 85.00 mm diameter mounting holes (tolerance H7, +0.030/0 mm), interference fit 0.015-0.030 mm. mm, press-fit installation, welding or heating deformation prohibited.

Installation and Maintenance Points:

Before installation, clean the pin and mounting hole. Check the bearing inner hole for scratches, bulges, and delamination. Measure the inner diameter of the mounting hole and the outer diameter of the bearing, ensuring an interference fit of 0.015-0.030 mm and a hole surface roughness Ra≤1.6 μm.

Use a hydraulic press to vertically press the bearing into the mounting hole with a pressing force ≤80 kN. Ensure the bearing end face fits snugly against the mounting hole step without misalignment. After press-fitting, check the inner hole roundness ≤0.02 mm. Do not directly strike the bearing outer ring with a hammer.

Maintenance Recommendations: Check the bearing clearance every 2000 hours. If the radial clearance >0.20 mm or abnormal noise or overheating occurs, replace immediately. Routinely add lithium-based grease (NLGI 2) according to the equipment manual, replenishing grease every 500 hours, adding only enough to overflow a small amount of new grease each time.