Published 4-20-2015, Control # 502-01 7-7
RT540E SERVICE MANUAL POWER TRAIN
FUEL SYSTEM
Description
The fuel system consists of the fuel tank, strainer, lift pump,
injection fuel pump, fuel-water separator filter and the fuel
injectors. All components except the fuel tank are installed
on the engine or supplied with the engine for remote
mounting.
Fuel Tank
The fuel tank (Figure 7-3) is a steel cylinder-type tank
located on the left side of the machine. The fuel tank has a
draw capacity of 220 l (58 gal). A connection on the bottom of
the tank provides for fuel supply to the engine. Surplus fuel
from the engine is provided to the bottom of the fuel tank
below the fuel level. The tank is equipped with a non-vented
filler cap, chain-attached to the tank, and a fuel quantity
sender unit which provides a signal to a fuel quantity gauge
on the instrument panel in the cab.
Injection Fuel Pump
The fuel oil is finely atomized as it is injected into the cylinder
and ignited by the heat of the compression. It is metered
also, before injection, to meet the load requirements
imposed upon the engine. Surplus fuel, returning from the
injectors, is bypassed back to the fuel tank or to the inlet side
of the pump. The continuous flow of fuel through the injectors
helps to cool the injectors and to purge air from the system.
Fuel Filter-Water Separator
The fuel filter-water separator removes impurities from the
fuel and also removes water from the fuel before it reaches
the engine. The filter is mounted on the left side of the
machine
The fuel mixture passes through the outer wrap of the first
stage of the filter paper, where large droplets of water are
formed as it is stripped from the fuel. The water falls out into
the void between the two paper elements and goes to a
reservoir in the bottom of the housing, where it can be
drained through a drain plug at the bottom of the housing.
Electric Lift Pump
The ECM controls the electric lift pump located between the
fuel tank and the injection pump. Whenever the keyswitch is
turned to the ON position, the lift pump will be energized for a
few seconds to make sure the low pressure fuel lines are
fully primed. The electric lift pump shuts off after the engine is
started.
Maintenance
NOTE: The entire fuel system must be maintained air tight
to prevent loss of prime.
Fuel Tank
The fuel tank should be kept filled, especially overnight, to
reduce condensation to a minimum. Refer to the applicable
engine manual for the recommended schedule for draining
any water or sediment from the tank.
Removal
1. Position a suitable container under the fuel tank and
drain all fuel from the tank.
2. Tag and disconnect the lines from the bottom of the tank.
3. Disconnect the electrical lead from the fuel quantity
sender unit.
4. Support the weight of the tank, loosen and remove the
hardware securing the straps to the mounting brackets.
Remove the tank and steps.
5. If a new tank is to be installed, remove the fittings, the
fuel quantity sender, and steps from the tank and install
them in the new tank.
Installation
1. Position the new tank on the mounting brackets and
install the hardware on the two straps. Torque the
capscrews, see Fasteners and Torque Values (pg 1-11).
2. Connect the electrical lead to the fuel quantity sender
unit.
3. Connect the two lines to the fittings on the bottom of the
tank in accordance with the identification marks made
during removal.
4. Service the tank.
Fuel Filter-Water Separator
Draining
The sump of the fuel filter-water separator should be drained
daily, 30 minutes after the engine is shut down, to remove
any water and sediment. Adhere to the following procedure.
1. Open the drain plug.
2. Drain until fuel appears.
3. Close the drain plug.
Reference Only
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