Description
CAT 5J-6180 TRUNNION
| CAT 5J-6180 TRUNNION |
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The CAT 5J-6180 is a trunnion designed by Caterpillar specifically for heavy equipment such as bulldozers and loaders. It is used for the articulation support of booms, rocker arms, or connecting rods, and provides positioning under radial loads and oscillating conditions. It is suitable for dusty and vibrating construction machinery operation scenarios and features high strength, high wear resistance, and impact resistance. The following is structured technology and application information:
Core Technical Parameters
Item Details
Basic Attributes
Model 5J-6180, integral alloy steel trunnion, material is 42CrMo alloy steel, quenched and tempered (hardness HRC32-38), single weight approximately 8.2 kg, operating temperature -30℃ to +120℃, load type is pure radial load + oscillating load, surface treatment is nitriding + polishing (nitriding layer thickness 0.3-0.5 mm, surface hardness HV850-1000), lubrication method is grease lubrication (recommended Cat 2V-9822 grease), design life ≥15000 hours (normal operating conditions)
Key Dimensions
Spindle diameter 70 mm (tolerance 0/-0.022 mm, mating shaft h7 tolerance), mounting hole diameter 25 mm (tolerance +0.015/0 mm), total length 280 mm (tolerance 0/-0.2 mm), flange diameter 120 mm diameter, flange thickness 20 mm, shoulder height 15 mm, chamfers at both ends 2×45°, spindle cylindricity ≤0.015 mm, end face runout ≤0.02 mm, surface roughness Ra≤0.8 μm
Compatible Models and Parts: Compatible with Cat D6R bulldozer (arm articulated), 950H loader (rocker arm support), 420F2 excavator (connecting rod trunnion), with matching 8G-8311 bushing, 1J-6472 retaining ring, 3B-8489 grease fitting, 3J-7354 O-ring
Rated Load: Radial rated dynamic load Cr=280 kN, radial rated static load Cor=560 kN, allowable swing angle ±15°, allowable linear velocity ≤0.8 m/s (grease lubrication), impact load ≥120 kN, ultimate pressure ≥420 MPa
Structural and Performance Advantages: 42CrMo The alloy steel structure undergoes tempering and nitriding treatment, balancing high strength with surface wear resistance, making it suitable for heavy-load and frequent oscillation conditions and reducing the risk of fatigue failure.
The integral design reduces assembly clearance and improves hinge accuracy. The flange and spindle are machined as a single unit, ensuring coaxiality ≤0.02 mm and guaranteeing smooth transmission.
Chamfered ends and nitrided polished surfaces facilitate bushing alignment during installation, reducing assembly damage and lowering the coefficient of friction, thus improving lubrication efficiency.
Installation and Maintenance Points: Before installation, clean the trunnion, bushing, and mounting base, checking for cracks, rust, and deformation. Measure the inner diameter of the spindle (70 mm, h7 tolerance) and bushing, ensuring an interference fit of 0.015-0.035 mm.
Cold-press installation is used. Apply pressure evenly to the flange end face using a special press; do not strike the spindle surface. After installation, check for flexible oscillation, ensuring no jamming or abnormal noise, axial movement ≤0.12 mm, and trunnion-bushing fit ≥90%. Maintenance and Replacement: Check the wear and lubrication condition every 2000 hours. If the spindle wear is >0.3 mm or scratches/peeling appear on the surface, replace it immediately. It is recommended to replace it at the same time as the bushing and retaining ring to ensure the accuracy and load-bearing capacity of the articulation mechanism.
