Case CX490D Operator's Manual page 206

4. Place a container with an appropriate capacity below
the end of the bleeding hoses (1).
5. Loosen the air bleed plug (2) of the left fuel main filter.
6. Turn the starter key to ON position.
NOTICE: Do not keep the starter key to ON position
for more than 5 min. Failing to comply will result in se-
rious damages to the fuel feed pump and to the electric
system of the machine. If air bleeding is not completed
after 5 min, stop the procedure and turn the starter key
to OFF position for 2 min. Then turn the starter key to
ON position again and complete the bleeding proce-
dure.
7. Turn the head of the priming piston (3) to the left. The
piston is thus unlocked. Pump against the priming
piston to help fuel flow into the filter body.
8. After some seconds, snug tighten the air bleed plug
(2), then restart pumping against the priming piston to
fill the filter body. As the priming piston becomes hard
to pump, loosen the air bleed plug to force fuel with air
trapped inside to go out through the bleeding hose (1).
9. Repeat the procedure of point 8 until fuel with no air
goes out from the bleeding hose. Tighten the air bleed
plug (2).
The tightening torque of the air bleed plug must be 8
– 12 N·m (5.9 – 8.9 lb ft).
10. Push the priming piston (3) fully inward and turn its
head to the right. The piston is thus locked.
11. Turn the starter key to OFF position.
12. Perform the same procedure for the right fuel main
filter. The positions of the air bleed plug (4) and
the priming piston (5) of the right fuel main filter are
shown in the picture.
13. Close the bleeding valve (B).
14. Open the engine valve (E).
15. Wipe off any spilled fuel around the air bleed plugs
(2) and (4), and at the end of the bleeding hoses (1).
16. Start the engine, and keep the speed to low idle. If the
engine does not start at this stage, repeat the steps
from 1 to 15, and then try to start it again.
17. Reach the pump compartment, and check for any fuel
leak from the components of the fuel supply line.
18. Get onto the cab, and gradually increase the engine
speed to the maximum. Keep max speed for 2 min,
then set the engine speed to low idle position.
19. Reach the pump compartment, and check for any fuel
leak from the components of the fuel supply line.
6 - MAINTENANCE
6-12
3
SMIL20CEX1327AA
4
SMIL20CEX1329AA
5
SMIL15CEXZ306AA