Transmission lubrication valve 154-15-34000 is suitable for bulldozers SD22, D85-18, and D95-2.

Transmission Lubrication Valve 154-15-34000 is suitable for bulldozers SD22, D85-18, and D95-2.

"Transmission lubrication valve" refers to the valve inside the transmission responsible for controlling and regulating the flow of lubricating oil (ATF - Automatic Transmission Fluid) to components requiring lubrication and cooling (such as gears, bearings, clutches, etc.). It plays a crucial role in the transmission hydraulic control system (usually part of the valve body). Its key functions and characteristics are as follows:

Core Functions:

Precise Lubricant Distribution: Different components inside the transmission have different lubrication requirements under different operating conditions. The lubrication valve (usually a group of valves working together) is responsible for guiding the lubricating oil from the oil pump to the various friction surfaces requiring lubrication and the components requiring cooling, according to demand, quantity, and pressure.

Maintaining Lubrication Pressure: Ensuring a continuous supply of lubricating oil at the appropriate pressure, especially under high load or high speed conditions, preventing oil film rupture that leads to dry friction and severe wear.

Heat Dissipation: Lubricating oil absorbs heat as it flows over friction surfaces. The lubrication valve controls the oil flow to carry away heat, thus cooling critical components.

Working Principle:

Lubrication valves are typically hydraulically controlled valves or electro-hydraulic valves.

Hydraulically Controlled Valve: Utilizes the pressure of the hydraulic oil itself, spring force, and oil circuit design to adjust the valve core position, thereby changing the oil passage and flow rate.

Electro-hydraulic Valve (Solenoid Valve): More common in modern transmissions. The transmission control module calculates the optimal lubrication requirements based on various sensor signals (such as speed, load, temperature, gear position, etc.) and then sends an electrical signal to a specific solenoid valve. The solenoid valve precisely controls the oil pressure and flow rate to the lubrication point by changing its opening degree or on/off state.

The transmission lubrication valve is a key actuator in the transmission hydraulic control system. It is responsible for accurately and intelligently managing and distributing the lubricating oil flow according to the actual operating conditions of the transmission, ensuring that all internal components requiring lubrication and cooling receive timely and adequate protection. It is an indispensable part of ensuring the long-term reliable, efficient, and smooth operation of the transmission. If a lubrication valve malfunction is suspected, it usually requires diagnosis and repair by a professional transmission repair technician, which often involves disassembling the valve body assembly for inspection or replacement.