New Holland CX720 Repair Manual page 1915

4. Clean the needle valve seat using the valve seat
scraper by rotating and pushing the tool onto the
valve seating.
Clean the fuel port using the fuel port scraper. Insert
the scraper into the port, press hard against the side
of the cavity and rotate to clear all carbon deposits
from this area.
5. Use a Reverse Flush Nozzle Adaptor on the injector
tester and reverse flush the nozzle to remove the
carbon loosened during cleaning, Step 2.
After flushing the nozzle, polish the valve seat by
placing a very small amount of tallow on the end of a
polishing stick and rotate in the nozzle.
6. Clean the top of the needle valve using a needle
valve scraper.
Clean the nozzle retaining nut using a brass wire
brush and check to see that the threads are not dam-
aged and are free from carbon deposits.
POWER PRODUCTION - FUEL AND INJECTION SYSTEM
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