FAST Gearbox Assy pressure switch HD90129710039 in stocked

As a critical hydraulic control component, this pressure switch’s core function is to real-time monitor the hydraulic oil pressure in the gearbox’s clutch control circuit and shifting control circuit. It operates based on the "diaphragm-type pressure sensing" principle: when the gearbox’s hydraulic pressure reaches the preset threshold (adjusted at the factory according to FAST gearbox requirements), the internal diaphragm deforms to trigger a microswitch, converting pressure signals into electrical signals (12V/24V DC) and transmitting them to the vehicle’s ECU (Electronic Control Unit). This enables the ECU to promptly adjust the gearbox’s shifting timing or issue fault warnings, preventing damage from abnormal pressure (e.g., low pressure causing weak shifting, high pressure leading to oil leakage)

Tailored for heavy-duty working conditions, the pressure switch boasts exceptional performance metrics: its measuring range covers 0.2-1.6 MPa, perfectly matching the normal hydraulic pressure range of FAST heavy-duty gearboxes. The pressure accuracy is ±2.5% FS (Full Scale), ensuring precise pressure detection and avoiding false signals caused by measurement errors. It supports a wide operating voltage range of 9-32V DC, adapting to the electrical systems of most commercial vehicles. Additionally, its response time is ≤50ms, enabling rapid signal feedback to the ECU—critical for maintaining smooth gear shifting during high-speed or heavy-load driving

The pressure switch features a robust structural design optimized for harsh vehicle environments: the outer casing is made of high-strength aluminum alloy (ADC12) with anti-corrosion electrophoretic coating, effectively resisting rust from road salt, water, and oil stains. The internal pressure-sensing diaphragm uses stainless steel (304), which exhibits excellent fatigue resistance and can withstand over 1 million pressure cycles without deformation. The electrical connector adopts a IP67 waterproof and dustproof design, preventing short circuits caused by water ingress or dust accumulation. Moreover, the thread interface (M10×1 or M12×1.25, depending on gearbox model) is precision-machined to ensure a tight seal with the gearbox’s oil circuit, avoiding hydraulic oil leakage

This pressure switch is mainly applied in FAST-equipped heavy-duty commercial vehicles (e.g., 15-50 ton cargo trucks, long-haul tractor-trailers, and mining dump trucks) and engineering machinery (e.g., large loaders and road rollers). In terms of installation, it follows a "direct replacement" design—matching the original pressure switch’s mounting position and electrical interface, so no modifications to the gearbox or vehicle wiring harness are needed. The installation process only requires basic tools (e.g., a torque wrench) and can be completed in 15-30 minutes, significantly reducing maintenance time for repair shops. Additionally, it comes with a pre-applied thread sealant (PTFE) to simplify installation and enhance sealing performance, further ensuring the reliability of the gearbox’s hydraulic control system