Description
CAT 276-4441 Idler Bearing Cap
| CAT 276-4441 Idler Bearing Cap |
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CAT 276-4441 is a Caterpillar idler bearing cover, adapted for the chassis idler shaft system of tracked excavators, loaders, and other equipment. It is used to seal and secure the idler bearing and withstand axial loads, preventing dust and moisture intrusion. The following is structured and precise information.
Core Parameters (Professional Version)
Project Details
Basic Attributes Model 276-4441, Idler Gear Bearing Cover (including sealing groove, mounting bolt holes, and locating pin holes), 2 pieces per unit (1 on each side), compatible with tracked chassis idler gear shaft ends, used for bearing axial positioning, dust and water protection, and auxiliary heat dissipation.
Key Dimensions Compatible shaft diameter 100 mm, outer diameter 180 mm, height 45 mm, 4 mounting bolt holes (diameter 12 mm, pitch circle diameter 150 mm), locating pin hole diameter 8 mm, sealing groove diameter 105 mm (compatible with O-ring φ105×3.1 mm), end face runout ≤0.05 mm
Material and Process Gray cast iron (HT250), surface sprayed with anti-rust primer + topcoat, hardness HB180–220, sealing groove surface roughness Ra≤1.6 μm, bolt hole thread accuracy 6H, locating pin hole tolerance H7
Performance Parameters Axial load ≥8 kN, sealing rating IP65 (with O-ring), operating temperature -40℃ to +120℃, vibration resistance ≤5 g, bolt preload torque 45–50 N・m. Compatible models: Cat 320/330 excavators, 950/962 loaders, some tracked chassis idler wheel assemblies. Compatible bearings: 569-4230, 449-5085, etc. Installation and Maintenance Points: Before installation, clean the bearing cap and mounting surface, check the sealing groove for damage, install the O-ring (e.g., CAT 123-4567) and apply grease. The clearance between the locating pin and the pin hole should be 0.01–0.03 mm.
Tighten the bolts diagonally, in 2–3 stages to achieve the preload torque of 45–50 N・m, avoiding deformation that could lead to seal failure.
After assembly, check that the axial movement is ≤0.05 mm, the bearing cap and idler wheel end face are in perfect contact without gaps, and the idler wheel rotates smoothly without jamming.
It is recommended to check the bolt tightness and sealing condition every 1000 hours. If leakage or loosening occurs, replace the O-ring and retighten it.
