CAT 9T-9836 25.15mm Inner Diameter Orifice Sleeve

CAT 9T-9836 is a Caterpillar genuine heavy-duty steel sleeve, compatible with the steering/braking systems of Cat 988G/H loaders, D8R/D9T bulldozers, and other models. It is used for positioning, wear protection, and load transfer between the pin and the mounting base. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model: 9T-9836; Type: Straight heavy-duty steel sleeve; Material: 4140 chromium-molybdenum steel (integral hardening HRC 58-62); Outer diameter: φ120 mm (4.72 in); Inner diameter: φ80 mm (3.15 in); Length: 85 mm (3.35 in); Weight: Approximately 4.2 kg; Interference fit with mounting base (0.03-0.04 mm); No lubrication groove (suitable for dry friction/grease lubrication); Chamfered ends: 2×45°; Surface blackening + oxidation treatment (corrosion resistance level) IP64)

Key Dimensions: Inner diameter tolerance +0.015/-0.010 mm, outer diameter tolerance +0.030/-0.020 mm, length tolerance ±0.15 mm, inner hole surface roughness Ra≤0.8 μm, outer diameter Ra≤1.6 μm, end face runout ≤0.05 mm, coaxiality ≤0.03 mm, mounting surface flatness ≤0.05 mm

Material and Process: 4140 alloy steel forging → precision turning → induction hardening → grinding; tensile strength ≥950 MPa, yield strength ≥750 MPa, hardened layer depth 2.0-2.5 mm, inner hole and pin working clearance 0.08-0.12 mm; compatible with NLGI 2 lithium-based grease (including EP additive)

Compatible Models: Cat 988G/H loader steering cylinder lug sleeve, D8R/D9T Bulldozer brake linkage pin sleeve, 834G/836G grader blade tilting cylinder hinge sleeve, suitable for heavy-duty hinge/transmission parts with a pin diameter of φ80 mm.

Assembly Fit: Press-fit pressure ≥15 t (hydraulic press + special positioning fixture). After installation, the inner hole clearance between the pin and the shaft should be 0.08-0.12 mm. The sleeve end face should be flush with the mounting seat (deviation ≤0.1 mm). Welding or hammering installation is prohibited.

Installation and Maintenance Points: Before installation, clean the mounting seat hole, pin, and sleeve, checking for cracks, deformation, and burrs. Use liquid nitrogen to shrink the sleeve (-196℃, 10-15 minutes) or a hydraulic press to ensure proper interference fit.

After installation, test the hinge/transmission components for flexible and smooth movement. Check for wear every 1200 hours (≤0.2 mm is normal). Replace immediately if scratches, peeling, or clearance >0.3 mm are found.

No grease is required under dry friction conditions. For grease-lubricated conditions, grease should be added every 800 hours. In dusty/humid environments, this interval is shortened to 400 hours. Avoid mixing different types of grease.