Description
CAT 9J-6251 TRUNNION
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The CAT 9J-6251 is a genuine Caterpillar blade trunnion (blowout/loader working device hinge shaft) used for the articulation and positioning of the boom and blade, bearing heavy loads and yaw torque. It is compatible with the blade suspension systems of CAT large bulldozers and loaders. The following are precise original specifications and application information, excluding replacement parts Cat®…
Core Technical Parameters
Item Details
Part Model: CAT 9J-6251 (Shovel Trunnion, Welded/Bolt-Fixed)
Material: 42CrMo alloy structural steel, quenched and tempered (quenching + high-temperature tempering), hardness HRC 28-32, tensile strength ≥ 1080 MPa
Key Dimensions: Spherical diameter 177.6 mm (6.99 in), total length 241.5 mm (9.51 in), mounting hole diameter 27.9 mm (1.08 in), journal diameter 100.0 mm, shoulder thickness 15.0 mm
Single Weight: Approx. 17.4 kg (38.36 lbs)
Tolerances: Spherical diameter tolerance ±0.05 mm, length tolerance ±0.1 mm, hole diameter tolerance H7 (+0.025/0 mm), journal tolerance f7 (0/-0.030 mm)
Performance Characteristics: Surface carburization depth 0.8-1.2 mm thick, HRC 58-62 hardness, uniform wear-resistant layer thickness, load-bearing capacity ≥ 500 kN, extreme operating temperature -40℃ to +120℃
Structure and Core Characteristics
Spherical Hinge Structure: One-piece molding of 42CrMo alloy steel, spherical design adapts to the push arm bushing, achieving flexible hinge for blade deflection and lifting, absorbing impact loads, suitable for heavy-duty conditions.
Temperature + Carburizing Treatment: Tempering ensures core toughness, carburizing strengthens surface hardness, excellent wear resistance and fatigue resistance, suitable for high-frequency deflection and heavy-duty friction scenarios.
Dual Mounting Structure Compatibility: Supports welding or bolt fixing, adapting to the push arm mounting requirements of different models, mounting hole diameter adapts to M27 high-strength bolts, precise shoulder positioning prevents axial movement.
Anti-corrosion Coating: Surface zinc passivation + coating with engineering machinery-specific primer, rust prevention level reaches IP65, suitable for harsh conditions such as dusty, humid, and saline environments.
Compatible Models and Application Scenarios
Compatible Equipment: CAT D8 and D9 series bulldozers, 980 and 982 series loaders, and the blade working devices of some graders, such as the hinge joint between the push arm and the blade, and the suspension system support points, etc. (Cat®…).
Core Applications: As the core hinge component between the blade and the push arm, it transmits pushing force and yaw torque, allowing the blade to rise, tilt, and yaw during operation, ensuring operational accuracy and stability. Suitable for heavy-duty conditions such as earthmoving and material loading.
