CAT 1T-1238 SLEEVE

CAT 1T-1238 is a Caterpillar original track pin sleeve (compatible with the track link articulation points of D8K/D8L bulldozers and 583K pipelaying machines, used to support track pins, transmit loads, reduce friction and wear between pins and links, and ensure smooth track operation). The following is the original data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model: 1T-1238; Type: Track Pin Steel Sleeve (Integral Solid Carbon Steel Sleeve, Surface Hardened + Tempered); Material: 40Cr Alloy Structural Steel (Contains 0.37-0.44% Carbon, 0.8-1.1% Chromium); Weight: 3.2 kg; Operating Temperature: -30℃ to +180℃; Rated Radial Dynamic Load: 180 kN; Rated Radial Static Load: 320 kN; Limiting Speed: 500 rpm; Coefficient of Friction: ≤0.10; Corrosion Resistance: IP65; Service Life: ≥12000 hours; Fitting Clearance: 0.05-0.12 mm; Lubrication Method: Grease Lubrication (Recommended: Cat MP grease)

Key Dimensions
Outer Diameter: 65 mm (2.559 in); Inner Diameter: 50 mm (1.969 in); Length: 150 mm (5.906 in); Wall Thickness: 7.5 mm mm, inner diameter tolerance H7 (+0.030/0 mm), outer diameter tolerance g6 (0/-0.022 mm), cylindricity ≤0.02 mm, surface roughness Ra 0.8 μm, chamfers at both ends 2×45°, hardened layer depth 1.5-2.0 mm, surface hardness HRC 50-55, mating shaft diameter 50 mm (h6 tolerance), mounting groove diameter 65 mm (H8 tolerance)

Compatible Models and Parts: Compatible with Cat D8K/D8L tracked bulldozers, 583K pipelaying machines, and D342 engine-driven heavy-duty tracked machinery. Installed in the pin holes of the track links, used in conjunction with track pins (1T-1237), one piece per link, used to withstand impact loads and radial loads during track operation, suitable for low-speed heavy-load conditions.

Performance Parameters: Tensile strength ≥1000 MPa, yield strength ≥800 MPa MPa, Brinell hardness HB 280-320 (matrix), compressive strength ≥900 MPa, fatigue strength ≥±220 MPa (10⁷ cycles), wear resistance (wear rate ≤0.008 mm/1000 hours), thermal conductivity ≥45 W/(m・K), linear expansion coefficient 12×10⁻⁶/℃, oil resistance (compatible with Cat DEO engine oil and hydraulic oil)

Structural and Performance Advantages
High-strength Material and Heat Treatment: 40Cr alloy steel, quenched and tempered, with a surface hardness of HRC 50-55, good core toughness, capable of withstanding track impact loads and heavy loads.

Precision Dimensions and Tolerance Control: Inner diameter H7, outer diameter g6 tolerance, cylindricity ≤0.02 mm, ensuring proper fit with track pins/links, reducing vibration and abnormal noise during operation.

Long-lasting wear-resistant design: Surface hardened layer depth 1.5-2.0 mm, suitable for grease lubrication, low wear rate, service life exceeding 12,000 hours, reducing track maintenance frequency.

Installation and Maintenance Points (Original Data)

Installation: Clean track pins and link pin holes (free from oil and burrs), cold press installation (pressure ≤120 kN, avoid local deformation), after installation, cylindricity ≤0.02 mm, radial runout ≤0.04 mm, check fit clearance after installation (0.05-0.12 mm), welding or hot fitting is prohibited (temperature >100℃ will affect material properties).

Maintenance: Replenish grease every 500 hours (10-15 g each time), check inner diameter wear every 1500 hours (wear >0.2 mm requires replacement), avoid overload (≤120% of rated load), prevent sleeve cracking or deformation.

Troubleshooting: Track misalignment is often caused by uneven wear of the sleeve, requiring replacement in pairs; abnormal noise from the chain links is often due to insufficient lubrication, requiring timely addition of grease; sleeve breakage is often caused by overload or improper installation, requiring inspection of operating conditions and installation process.