CAT 613-2975 Cab Mounting Sleeve

CAT 613-2975 is a Caterpillar original equipment manufacturer (OEM) cab ROPS/FOPS mounting sleeve, used for shock absorber mounts, rollover protection bracket (ROPS) columns, or four-point suspension mounts on excavator/loader cabs and frames. It provides positioning guidance and axial clearance compensation. Each sleeve weighs approximately 0.28 kg, and one is provided per mounting point. The following is the professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes: Model 613-2975, cylindrical positioning sleeve, outer diameter φ50 mm, inner diameter φ30 mm, length 45 mm (tolerance ±0.1 mm), material is 45# steel (quenched and tempered HB 220-250), surface galvanized and passivated (color zinc), corrosion resistance ≥96 hours salt spray

Key Dimensions: Chamfered ends 1×45°, inner hole fit tolerance +0.01/-0.005 mm, radial runout ≤0.02 mm, end face perpendicularity ≤0.03 mm, mounting hole center distance 65 mm (compatible with M10 bolts)

Material and Process: 45# steel integral forging + quenching and tempering, inner hole precision reaming (Ra≤0.8 μm), outer cylindrical grinding (Ra≤1.6 μm), galvanized layer thickness 8-12 μm, rated load axial 12 kN, radial 8 kN, operating temperature -40℃ to +120℃

Compatible Models: Compatible with ROPS column mounts for Cat 320GC/330GC excavators, 938K/950GC loaders, and 140M graders; also used for positioning the four-point suspension shock absorber seat in the cab of IT62G tool loader and AP655F asphalt paver.

Assembly Fit: Interference fit with frame mounting holes (0.01-0.02 mm), clearance fit with cab support (0.02-0.03 mm). (mm), bolt preload torque 35-40 N·m, clearance between sleeve end face and shock absorber upper seat ≤0.2 mm. Installation and Maintenance Points: Before installation, check the sleeve for deformation and cracks. Clean the mounting holes and mating surfaces, removing rust and burrs, ensuring no oil contamination, and avoid installation misalignment.

Use cold pressing or a special press tool for installation. Do not strike, as this may deform the sleeve and affect positioning accuracy. Tighten the bolts symmetrically and evenly, achieving the preload torque in two stages.

Maintenance Cycle: Check the sleeve for looseness and wear every 2000 hours. Replace it promptly when the wear of the inner hole is >0.1 mm. It is recommended to replace it during a major overhaul of the cab suspension assembly.