SD22 SD32 bulldozer spare parts NT855 injector 14914505 4914537 3054218

SD22 SD32 Bulldozer Spare Parts NT855 Injector 14914505 4914537 3054218

The bulldozer injector is a core component of the diesel engine's fuel supply system. Its function is to precisely inject high-pressure fuel into the cylinder, directly affecting the engine's power, economy, and emissions performance. Modern bulldozers mostly use electronically controlled common rail technology, which stabilizes fuel pressure through a high-pressure fuel rail, and the ECU intelligently controls the injection parameters, making it more efficient and environmentally friendly than traditional direct injection engines.

Working Principle

The injector uses the ECU (Electronic Control Unit) to control the energizing time of the solenoid valve, achieving precise adjustment of the injection timing and duration. When the solenoid valve is energized, the internal drain channel opens, the pressure on the plunger top surface decreases, and the needle valve opens under the pressure difference, injecting fuel into the cylinder through the injection orifice; after de-energization, the needle valve resets, and injection stops.