CAT 202-7838 Insulation Retainer

CAT 202-7838 is a dedicated insulating fastener for Caterpillar engine electrical systems. It is suitable for securing and electrically insulating wiring harnesses/sensors in models such as C15/C18 engines, 349D2 excavators, and 992K loaders, preventing short circuits and grounding faults, and ensuring stable operation of the electrical system. It is often used in conjunction with bolts and clips. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 202-7838, Insulation Fixture (Insulation Support/Isolation Component), material is reinforced nylon PA66+30% glass fiber (insulation resistance ≥10¹² Ω, dielectric strength ≥20 kV/mm, temperature resistance -40℃ to +150℃, flame retardant rating UL94 V-0, anti-aging, anti-chemical corrosion), single weight approximately 0.08 kg, used for fixing wire harnesses/sensors, isolating conductive components, preventing short circuits and grounding faults, suitable for low voltage (≤380 V) electrical systems

Key Dimensions
Main body outer diameter 25 mm, inner diameter 12 mm, total height 30 mm, mounting hole diameter 8 mm (suitable for M8 bolts), insulation wall thickness 6.5 mm, positioning groove width 5 mm, chamfer 5°×1 mm, perpendicularity ≤0.05 mm, flatness ≤0.03 mm

Compatible Models: Cat C15/C18 engine (fuel injection system wiring harness fixing), 349D2 excavator (hydraulic pump sensor insulation support), 992K loader (transmission wiring harness isolation component), D11T bulldozer (insulation fixing inside electrical control cabinet), using matching M8×25 bolts and 202-7839 clips.

Electrical Performance: Insulation resistance ≥10¹² Ω (DC 500 V), dielectric strength ≥20 kV/mm, withstand voltage AC 2500 V/1 min without breakdown, leakage current ≤0.5 mA, flame retardant rating UL94 V-0, operating frequency 50/60 Hz, suitable for low-voltage electrical systems.

Installation and Maintenance Points: Clean the mounting surface before installation, check the insulation fastener for cracks and damage, and confirm that the outer diameter of the matching wiring harness/sensor matches the mounting hole size; apply thread-locking adhesive (such as Loctite 243) to the mounting holes to prevent bolt loosening.

Tighten the bolts with an M8 torque wrench to a torque of 18-22 N·m, ensuring the retainer is flush with the mounting surface and that the wiring harness/sensor is secure and without interference. After securing, check that the insulation resistance is ≥10¹² Ω and that there are no short circuits or grounding issues.

Maintenance and Replacement: Inspect the retainer for wear and cracks every 2000 hours. If the insulation resistance is <10¹⁰ Ω or if damage is found, replace it immediately. It is recommended to replace it at the same time as the matching bolts and clips to ensure effective insulation and fixation.