New Holland CX720 Operator's Manual page 392

Fuel filter (CNH engine)
The fuel filter 1 should be changed every 600
operating hours. Proceed as follows:
1. Wipe the top of the filter head clean.
2. Loosen the screw at the bottom of filter 1 to allow
the fuel to run out of the screw orifice.
3. Unscrew the fuel filter, using a filter wrench.
4. Coat a film of fuel to the seal of the new fuel filter.
5. Screw the new filter on by hand and tighten it
securely (firmly against the head and then an
additional 1/4 to 1/2 turn). DO NOT USE TOOLS.
6. Close the screw at the bottom of the filter.
7. Bleed the fuel system, refer to next paragraph
headed: "Bleeding the fuel system
(CNH engine)".
8. The fuel filter contains a sediment bowl at its
bottom side, which collects large particles of dirt
and water. This sediment bowl can be removed
and cleaned.
Fuel supply pump
A fuel supply pump is also fitted to at the entry point
into the injection pump fuel system. The purpose of
the supply pump is to draw fuel from the tank, and
pressurize the fuel to a minimum of 1.4 bar (20 psi)
in order to cause fuel to flow through the filter and to
provide sufficient pressure for pumping element fill-
ing. The supply pump housing also contains a sedim-
enter assembly consisting of a clear bowl (2) and
strainer screen (3). The clear bowl should be in-
spected for sediment every 50 hours and cleaned
every 600 hours.
On top of the supply pump is fitted a primer pump (1)
which is used to prime the injection pump with fuel
when the filter element has been changed.
SECTION 4 – LUBRICATION AND MAINTENANCE
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