New Holland CX720 Repair Manual page 1917

Fuel injector - Test (B.20.A.29 - F.40.C.01)
CX720, CX740, CX760, CX780, CX820, CX840
The spray from a fuel injector tester can pierce human skin with fatal results. When an injector is spraying,
the nozzle holder should be turned away from the operator and any other persons. Z024
1. During the Nozzle Opening Pressure and Spray Pat-
tern Tests, collect the spray in a container partly filled
with rags to absorb the spray.
When conducting the Nozzle Seat Leakage Test, re-
lease the injector tester pump pressure before touch-
ing the nozzle tip with a sheet of blotting paper.
The spray is flammable make sure no open flames are
in the area of the tester and do not generate excessive
vapor. Z025
2. Fill the injector tester,
FNH01721), with a calibrating type fuel oil and
leave the filler cap loose to prevent a vacuum form-
ing during testing.
Prime the tester until oil is emitted from the tester line,
then connect the injector.
Make sure the knob on the right-hand side of the
tester is screwed in to prevent the gauge being over-
pressurized if the injector nozzle is blocked.
Pump the tester and check the nozzle is free to
open. Open the pressure gauge valve and begin
injector testing. If the nozzle is blocked or the needle
jammed, disassemble the injector.
Nozzle Opening Pressure Setting - Slowly pump the
injector tester and observe the pressure at which the
needle valve lifts and fuel is injected from the noz-
zle tip. The minimum acceptable opening pressure
is 280 bar (4060 lbf/in2) and the specification for
new injectors is 300 bar (4350 lbf/in2). If the open-
ing pressure is below 280 bar (4060 lbf/in2) reset to
specification by adding shims to the injector spring
as shown in the injector disassembly procedure.
POWER PRODUCTION - FUEL AND INJECTION SYSTEM
WARNING
Tool No.290284 (NA-
WARNING
2 4/7/2006
B.20.A / 87
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