500 KW Cummins Generator Set PT Pump Fuel Outlet Pressure Adjustment

The PT pump fuel injection system of a 500 KW Cummins generator set is superior to the inline pump fuel injection system and the distribution pump fuel injection system in terms of power, economy, and environmental protection.

The PT pump fuel injection system is a specialized fuel injection system for Cummins K series, N series and other models, and there is already an electronically controlled PT fuel injection system. There are three methods for adjusting the fuel outlet pressure of the PT fuel pump of a 500 KW Cummins generator set. Specifically, as follows:

1. Using a diesel generator and a dynamometer to load the diesel engine, first check the speed at the disconnection point of the governor. When the throttle valve is fully open, increase the load to the rated speed of the diesel engine and observe the outlet pressure of the fuel. When the pressure is below or above the limit value, adjust it according to the following methods: unscrew the maximum opening adjustment screw of the throttle valve, remove the shaft of the throttle valve, and add an appropriate thickness of gasket to increase the pressure. Remove the appropriate thickness of gasket from the throttle valve to reduce the pressure. Under no circumstances should the fuel outlet pressure of the PT fuel pump be adjusted beyond the maximum specified value.

2. When the throttle valve is fully open, check the maximum pressure at the fuel outlet in sequence from low speed to high speed through the transmission. If the pressure is lower than the minimum value specified by the machine or higher than the maximum value specified, it should be adjusted according to Method 1.

3. Pressure check method. This method is not as precise as methods 1 and 2, but it is relatively simple. That is, unscrew the oil cut-off solenoid valve and install a pressure gauge, remove the connecting piece on the throttle valve rocker arm (throttle rocker arm), and turn the throttle valve rocker arm clockwise to the end; Start the diesel engine and run it at a speed 250r/min higher than idle speed; Then accelerate rapidly to the maximum speed of the diesel generator and check the instantaneous pressure reading on the pressure gauge. If it does not match the specified value, the adjustment method is as described in Method 1. After checking and adjusting, the pressure gauge should be removed, the oil cut-off solenoid valve should be reinstalled, and the pipeline flowing through the smoke limiter should be blocked.

The supply pressure of the Cummins generator PT fuel pump or the inlet pressure of the fuel injector depends on the opening of the throttle valve in the PT pump and the outlet pressure of the governor. When the opening of the throttle valve is constant, the supply pressure of the fuel pump increases or decreases with the increase or decrease of the outlet pressure of the governor. The oil pressure increases or decreases with the increase or decrease of centrifugal force on the governor flying block, and the magnitude of centrifugal force increases or decreases with the increase or decrease of diesel engine speed. Therefore, when the opening of the throttle valve remains constant, under different diesel engine loads, the combined effect of fuel supply pressure and time keeps the diesel engine speed basically unchanged.

As a professional diesel generator manufacturer, we always insist on using first-class talents to build a first-class enterprise, create first-class products, create first-class services, and strive to build a first-class domestic enterprise. If you would like to get more information welcome to contact us via sales@dieselgeneratortech.com.