CAT 6L-7142 Lower Spring Seat

The CAT 6L-7142 is a Caterpillar original mechanical suspension low-back seat, suitable for small loaders, excavators, graders, and other equipment. It provides basic shock absorption and ergonomic support to alleviate operator fatigue during long working hours and is a fundamental component of the cab’s ergonomic system.

Core Technical Parameters

Item Details
Part Model: CAT 6L-7142 Mechanical Suspension Low-Back Seat (including seat cushion, backrest, mechanical suspension, slide rail, seat belt)

Material: Seat cushion/backrest is made of high-density cold-foamed polyurethane + wear-resistant vinyl/fabric fabric; suspension is made of high-strength carbon steel, slide rail is made of galvanized steel, corrosion resistant; seat belt is made of polyester fiber, tensile strength ≥22kN

Key Dimensions: Overall width approx. 46-48cm, overall height approx. 50-52cm, seat depth approx. 42-44cm, mechanical suspension travel approx. 76mm (3in), weight approx. 18-20kg, mounting hole spacing 254×292mm (10×11.5in), compatible with standard ROPS seat base

Compatible Machines: Mini loader 906H/907H, excavator 305E/306E, grader 120K, bulldozer D3C/D4C Basic configuration models compatible with ROPS/FOPS cabs

Performance Features: Mechanical spring suspension for shock absorption, suitable for vibration conditions of small equipment; contoured seat/backrest support to reduce lumbar pressure; adjustable front and rear rails with a travel of ≥150mm to accommodate operators of different heights; integrated operator presence switch (OPS) for safety.

Core Functions and Structure:

Basic Shock Absorption and Support: Mechanical spring suspension filters low-frequency vibrations during equipment operation, reducing vertical impact on the operator, suitable for non-extreme vibration conditions of small equipment, and improving comfort during long-term operation.

Ergonomic Fit: Low-backrest conforms to the lumbar curve; high-density foam seat cushion provides lasting support, reducing fatigue from prolonged sitting; adjustable front and rear rails accommodate different operator body types, meeting diverse driving needs.

Integrated Safety Protection: Built-in retractable safety belt and operator presence switch; when the seat is unoccupied, the equipment safety lock is triggered to prevent accidental operation; compliant with ROPS/FOPS safety standards, ensuring operational safety.

Durable and easy to maintain: The vinyl/fabric fabric is wear-resistant and stain-resistant, making it easy to clean; the carbon steel suspension and galvanized rails are rust-proof, suitable for outdoor working conditions, reducing maintenance frequency and extending service life.

Installation and Maintenance Points
Installation Specifications
Clean the mounting surface of the cab seat base, check that the mounting holes match the 6L-7142 rail holes, ensure that the bolt holes are free of rust and deformation, and use high-strength bolts of grade 8.8 or higher for tightening, controlling the torque between 45-55 N·m.

After installation, test the smoothness of the rail’s forward and backward sliding, the suspension’s up and down shock absorption without jamming, the seat belt’s extension and retraction freely, and the operator’s switch signal is normal, avoiding loose wiring that could cause safety lock failure.

Check the distance between the seat and the control levers and steering wheel to ensure no interference with operator operation, improving operational convenience.

Maintenance Recommendations

Inspect every 500-800 working hours: Check suspension springs for deformation or breakage, slide rails for rust or jamming, fabric for damage, and seat belts for aging or cracks. Replace any parts immediately if problems are found.

Regularly clean the seat surface to remove oil and dust. Apply lithium-based grease to the slide rails to reduce friction and wear, and maintain smooth adjustment. Avoid scratching the fabric with sharp objects to prevent damage to the internal foam layer.