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MAINTENANCE
DIESEL FUEL SYSTEM
•
The diesel fuel system consists
of a sup-
ply tank, filtering units, and pumping and in-
jection units.
This tractor
is regularly
equipped with an IH twin plunger injection
pump, the component parts of which are given
below. Every unit of the fuel system is
thoroughly engineered for steady, dependable
operation.
This manual covers the ordinary
servicing and adjustments
necessary
to meet
various operating conditions.
The operator
should avoid tampering with any of the units
of fine precision
construction.
In case any
trouble is experienced
which cannot be over-
come by following the instructions
in this
manual, refer to your International
Industrial
Power distributor
or dealer.
Components of the Fuel System
This fuel system includes:
the fuel tank;
water trap; twin fuel filters;
twin plunger in-
jection pump with primary
and scavenging
pumps and built-in governor; injection noz-
zles; and necessary
piping and connections.
Flow
of
the Fuel
The diesel fuel passes through the sys-
tem as follows:
1. Fuel flows from the fuel tank by grav-
ity through the water trap to the auxiliary
fuel filter.
2. From the auxiliary filter the fuel en-
ters the primary pump through a replaceable
close mesh strainer
and is forced under pres-
sure through the final fuel filter,
then through
fine mesh strainers
into reservoirs
above the
plungers in the injection pump.
Excess fuel
from the primary pump is released
by a by-
pass valve for recirculation
through the pri-
_ mary pump.
~\
3. From the injection pump reservoirs
the fuel is then forced by the plungers through
the distributor
valves and fuel lines to the
injection nozzles and into the combustion
chambers
of the engine.
4. Excess and by-passed fuel from the
fuel injection pump is returned to the fuel
tank.
Diesel Fuel Storage and Care
Diesel fuel should be free from dirt and
~
water.
Dirt and water in the fue~ affect the
~7life
of the filters
and pump.
H dir-t reaches
the injection pump, it will act as an abrasive
on the closely fitted moving parts, causing
rapid wear and shortening the life of the
pump.
H water is allowed to pass through
the pump, it may cause corrosion
and sub-
sequent scoring of parts.
Refer to diesel fuel
specifications
on p~e
8.
A storage tank provides the best method
of supplying fuel on the job.
Sediment and
water can easily be drained off through a
trap, and fuel can be pumped into the tractor
tank with a minimum of handling.
When con-
ditions require drums for storage, use a
pump to draw the fuel rather than a faucet, as
the water and foreign materials
settle to the
bottom of the drum.
The suction pipe of the
pump should be set at least 3 inches from the
bottom of the tank or drum.
When drums are used for storage, they
should be placed under cover or in a horizon-
tal (laid down) position if left exposed to rain.
Do not disturb the drums after the fuel set-
tles.
The last 3 inches in each drum or tank
should not be used, but should be collected
into 1 container and allowed to settle.
·In this
manner the sediment and foreign materials
can be separated from the fuel and disposed
of with no loss of fuel.
Water Trap
The diesel fuel water trap is located be-
low the auxiliary filter, attached to the filter
base casting.
Glass
bowl
A.24940
Illust. 58
Diesel fuel water trap
taken apart for cleaning.
65
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