105-8281: Single Flanged Steel Roller

Cat 105-8281 is a Caterpillar single-flange steel track roller, primarily used in tracked construction machinery chassis. It supports the machine body, guides track movement, and distributes ground pressure. It is compatible with Cat® Parts tracked chassis systems for equipment such as mini excavators and skid steer loaders. The following are precise parameters and application points:

Core Parameters (Authoritative Version)

Project Details
Basic Information
Model 105-8281, type is single-flange steel track roller, single-flange structure (single-sided with flange), used for inner track guidance and positioning, suitable for low-speed heavy-load, dusty working conditions, commonly used in the track chassis of equipment such as 301.7CR/302CR mini excavators, 216B3 skid steer loaders, etc., mounted on the track frame crossbeam, 3-4 evenly distributed on each side.

Compatible Models
Compatible with Cat 301.7CR/302CR/302.7CR mini excavators, 216B3/226B3 skid steer loaders, 247B3 multi-purpose loaders, etc., commonly used in track frame track roller axles, track tensioning mechanisms, chassis travel systems, etc.

Material and Process
Material is 42CrMo alloy steel, wheel body is forged + quenched (surface hardness…) HRC52-58 (core hardness HRC30-35) + tempering treatment, flange and wheel surface integrally formed, surface sprayed with wear-resistant primer + topcoat, corrosion resistance level reaches 72 hours salt spray test with no red rust, wheel surface precision ground, roughness Ra≤0.8μm

Key Dimensions: Wheel diameter (tread diameter) 180mm, flange diameter 105mm, wheel width 55mm, shaft hole diameter 30mm, center distance 120mm, weight approximately 3.2kg, wheel runout tolerance ≤0.2mm, flange perpendicularity tolerance ≤0.15mm, rated load 1.2t, maximum operating speed ≤5km/h

Matching Components: Compatible with 30mm diameter support wheel axle, matching bearing is 6206-ZZ deep groove ball bearing, seal is double lip skeleton oil seal (model TC30×52×7), mounting bolts are M12×40 (8.8 grade), torque value… 80-90 N·m
Function, Installation, and Maintenance Points
Core Functions: Supports equipment weight (single wheel rated load 1.2t), guides track straight movement, and prevents track derailment; the arc-shaped wheel surface design reduces track wear, disperses ground pressure (ground pressure ≤0.15MPa), and is suitable for soft ground operation.

Installation Points: Before installation, check the condition of the wheel body, bearings, and oil seals. Apply grease (Cat 10-9275 extreme pressure lithium-based grease) to the axle surface; tighten bolts diagonally and evenly. After installation, manually rotate the wheel body to ensure there is no jamming or abnormal noise. The track tension should have a sag of 20-30mm.

Maintenance Points: Check the sealing and lubrication condition every 200 hours; replace oil seals and replenish grease every 500 hours; replace the wheel immediately if the wheel surface wear exceeds 3mm, the flange deformation exceeds 1.5mm, or abnormal bearing noise occurs to prevent track misalignment or wear on the support roller axle.