GF47.00-W-0002A | Fuel supply, function | 4.7.07 |
ENGINE 904.9 in MODEL 375.1 with BODY 375.830
ENGINE 904.9 in MODEL 970, 972, 975, 976 with BODY 972.899
ENGINE 906.9 in MODEL 970, 972, 974, 975, 976 with BODY 972.899
ENGINE 906.9 in MODEL 375.3 with BODY 375.810
ENGINE 906.9, 926.9 in MODEL 950, 952, 953, 954 with BODY 940.899
W47.00-1023-76
Shown on engine 906.9
2.1 Fuel prefilter
3.1 Assembly valve in fuel feed flow (opened by pressure)
3.2 Assembly valve in fuel return flow (opened by pressure)
5 Fuel pump
6 Fuel filter
7 Nozzle holder combination
8 Overflow valve (4.5 bar)
Y6 Cylinder 1 unit pump
Y7 Cylinder 2 unit pump
Y8 Cylinder 3 unit pump
Y9 Cylinder 4 unit pump
Y10 Cylinder 5 unit pump
Y11 Cylinder 6 unit pump
A Fuel feed line, suction side and / or vacuum side
D Fuel return line
B Fuel feed line, pressure side
C Fuel high-pressure line
General information
The fuel supply ensures that the fuel required for combustion is available under all operating conditions in the sufficient quantity, at the correct time and with the required pressure.
Fuel to the individual cylinders is supplied through the Pump Line Nozzle System (PLD System), which is provided with fuel by the fuel low pressure circuit.
Fuel low pressure circuit
The fuel low pressure circuit ensures that the fuel is cleaned and is provided to the unit pumps of the PLD System in the sufficient quantity and with the required pressure.
It basically consists of the following components:
Fuel tank
Fuel prefilter (2.1)
Fuel pump (5)
Fuel filter (6)
Overflow valve (8)
Suction or vacuum side fuel feed line (A)
Pressure side fuel feed line (B)
Fuel return lines (D)
Pump Line Nozzle System (PLD System)
The fuel provided by the fuel low pressure circuit through the PLD system is injected into the cylinders in the adequate quantity, at the correct time and with the correct pressure.
The Pump-Line-Nozzle system consists of unit pumps for cylinder 1 to 6 (Y6 to Y11), injection nozzles in the nozzle holder combinations (7), pressure pipe connections and the high pressure fuel lines (C), over which the individual unit pumps are connected with the respective injection nozzles.
The excess fuel delivered during high-pressure delivery reenters the fuel low pressure circuit through fuel return lines (D).