CAT 110-3292 Weld-On Trunnion

CAT 110-3292 is a Caterpillar original weld-on trunnion used for the pusharm hinge of bulldozer housing and frame support. It has a ball diameter of 126.5 mm and is used to transfer heavy loads and enable articulated swing. It weighs about 12.5 kg and is used in sets of 2 (symmetrically installed on the left and right sides) Cat® Parts. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes Model 110-3292, spherical welded trunnion, spherical diameter φ126.5 mm (tolerance ±0.05 mm), compatible spherical bearing inner diameter φ126.5 mm, rated static radial load 800 kN, operating temperature -40℃ to +120℃

Key Dimensions Spherical length 150 mm, welded base diameter φ160 mm, base thickness 25 mm, total length 280 mm, chamfer at both ends of the spherical surface C2 mm, weld bevel angle 30° (single-sided bevel, depth 5 mm)

Material and Process Material is 4140 alloy steel (quenched and tempered, HB 285-320, tensile strength ≥1000 MPa), spherical surface carburized and quenched (carburized layer depth 1.2-1.5 mm, surface hardness HRC 58-62), surface roughness… Ra≤0.8 μm, overall blackening treatment (corrosion protection)

Compatible Models: Compatible with the pusharm and frame hinge joint of bulldozers such as Cat D6R, D7R, and D8R. Installed within the pusharm welded support, it mates with the spherical plain bearing to achieve pusharm swing.

Assembly Fit: Interference fit with the spherical plain bearing (interference 0.02-0.04 mm). After welding, coaxiality ≤0.05 mm, end face runout ≤0.03 mm.

Installation and Welding Points: Before installation, clean the surfaces of the welding base and pusharm support to remove oil, rust, and scale. Ensure the welding surface is free of impurities. Measure the trunnion spherical diameter and the support bore diameter to ensure they meet the interference fit requirements.

The root pass is performed using argon arc welding (ER80S-G welding wire, 2.4 mm diameter), followed by carbon dioxide gas shielded welding (E7018 welding wire, 3.2 mm diameter). The welding current is 180-220 A, the voltage is 24-28 V, and the welding speed is 150-200 mm/min.

Segmented symmetrical welding is employed during the welding process, controlling the interpass temperature to ≤200℃ to prevent welding deformation. Post-weld stress-relief annealing is performed (temperature 600-650℃, holding for 2 hours, followed by furnace cooling).

After welding, the spherical roundness is checked to be ≤0.03 mm, the coaxiality to be ≤0.05 mm, and there should be no cracks, porosity, or other defects. The surface is then ground to a roughness Ra ≤0.8 μm.