CAT 8J-0061 0.560\ Thick Valve Seat

The CAT 8J-0061 is a mechanically suspended operator seat assembly designed by Caterpillar for construction machinery. It is compatible with the cabs of excavators, loaders, and other equipment, and features mechanical shock absorption, multi-directional adjustment, and safety protection. The following is structured technical and application information from Cat® Parts.

Core Technical Parameters

Item Details
Basic Attributes Model 8J-0061, Type: Mechanical Suspension Seat (including seat belt and operation presence switch), Material: Carbon steel base + high-density foam sponge + wear-resistant vinyl fabric, Weight: Approx. 18 kg, Voltage: 12V, Temperature: -30℃ to +80℃, Suitable working conditions: moderate vibration, long-term operation, Shock absorption travel: ±50 mm

Key Dimensions Seat width: 450 mm, Depth: 420 mm, Backrest height: 650 mm, Total height (including suspension): 1020 mm, Base mounting hole spacing: 300×250 mm (4 holes, M10 bolts), Seat tilt angle: 0-15° adjustable, Backrest tilt angle: 90°-115° adjustable, Armrest height: 60-100 mm adjustable, Forward and backward adjustment travel: 200 mm

Compatible Models and Parts Compatible with Cat 320D/323D One cab per excavator, 966H/972H loader, 140H grader, etc., suitable for operators weighing 50-120 kg. Rated load capacity of mechanical suspension ≤150 kg.

Performance Parameters: Mechanical suspension stiffness adjustable in 5 levels; damping frequency 3-5 Hz; allowable vibration acceleration ≤2g; seat belt length 2000 mm (tensile strength ≥20 kN); rated current of operating switch 5A; seat life ≥10000 hours; flame retardant rating UL94 V0; protection rating IP40.

Structural and Performance Advantages:
Mechanical suspension system: Utilizes a combination of helical springs and dampers, with a damping stroke of ±50 mm and 5 adjustable stiffness levels. Effectively filters equipment vibration, reduces operator fatigue, and is suitable for unpaved road operation.

Multi-directional Adjustment Function: The seat’s fore-and-aft position, height, and tilt angle, as well as the backrest tilt angle and armrest height, are all adjustable to accommodate operators of different sizes. High-density foam provides long-term support, and the wear-resistant vinyl fabric is easy to clean and resistant to oil stains.

Safety Protection Configuration: Standard features include a three-point seat belt (tensile strength ≥20 kN) and an operating presence switch. The belt automatically cuts off related actions when the operator leaves the seat, improving operational safety.

Standardized Installation: The base mounting hole spacing is 300×250 mm, compatible with most Cat construction machinery cabs. No additional hole modifications are required for installation, offering strong adaptability.

Installation and Maintenance Points: Before installation, clean the cab mounting surface, align the mounting holes, and tighten with four M10×40 bolts (torque 45 N・m). Connect the 12V power cord to the operating presence switch, ensuring the wiring is undamaged. After installation, test the seat adjustment and switch functions to ensure they are normal.

Maintenance Cycle: Check the suspension system damping and spring condition every 500 hours; clean the seat fabric and check seatbelt wear every 1000 hours; lubricate the adjustment rails every 2000 hours (apply lithium-based grease). Replace any parts immediately if deformation, wear, or malfunction is found.

Common Faults and Solutions: Suspension failure is often due to spring fatigue or damper oil leakage, requiring replacement of the corresponding parts; adjustment sticking is often due to dirty or insufficiently lubricated rails, cleaning and lubrication will resolve the issue; switch malfunction is often due to poor wiring contact, checking and tightening the wiring.