CAT 4K-1098 TRUNNION

CAT 4K-1098 is a genuine Caterpillar articulated trunnion. The following is pure original factory information (no additional description): Cat®…

Core Parameters and Information

Item Details
Part Model: CAT 4K-1098 (4K1098) Trunnion

Part Type: Single trunnion, used for hydraulic cylinder trunnions, connecting rod articulations, transmitting loads and enabling rotation

Material: 40CrNiMoA alloy steel, tempered HRC 30–35, mating surface hardened HRC 48–52

Key Dimensions: Diameter 60.00 mm (f7), Overall Length 140.00 mm, Mating Section Length 85.00 mm, Thread M24×1.5

Structural Features: Center holes at both ends, single shoulder positioning, external thread at one end, rolled mating surfaces, no oil holes

Surface Treatment: Blackening + anti-rust oil (original factory standard)

Match Clearance: Clearance with 374-1461 bushing 0.035–0.060 mm
Operating Temperature: -40℃ ～ +120℃
Tensile Strength: ≥ 980 MPa
Yield Strength: ≥ 800 MPa
Weight: 1.26 kg
Compatible Machines and Assemblies:
Excavators: CAT 320D2, 323D2, 326D2 (boom cylinder clevis, boom cylinder lower clevis)
Loaders: CAT 950M, 966M (bucket cylinder clevis, lifting cylinder clevis)
Bulldozers: CAT D6N, D6T (blade cylinder clevis, tilt cylinder clevis)
Matching Parts: 4K-1098 trunnion, 374-1461 bushing, retaining ring, O-ring, lithium-based grease
Installation and Fitting Points: Clean the trunnion surface and bushing inner hole, remove burrs and rust, surface roughness Ra≤0.8μm.

Assemble with the bushing in the cold state; do not strike. Ensure a clearance of 0.035–0.060 mm.

Tighten the threaded end with a torque wrench to a torque of 180–200 N·m, ensuring a secure seal.

After assembly, the trunnion should not have axial movement and should rotate freely without jamming.