Case CX490D Operator's Manual page 266

Hydraulic pump
Using a solvent, clean the periphery of the air bleed
plug.
Loosen the air bleed plug, remove the plug if the fluid
does not flow.
Fill the pump with new clean hydraulic fluid. Install and
tighten the air bleed plug.
Start the engine and run it at low idle speed. Loosen
the air bleed plug on the pump.
Tighten the plug when air free fluid comes out of the
bleed plug hole.
Clean the area completely.
Swing reduction gear
Set the engine at a low idle, and loosen the air bleed
plug. Check that oil oozes from there. At this time, do
not perform swing operation.
If oil does not ooze, stop the engine, remove the air
bleed plug, and fill the motor case with hydraulic fluid
via the air bleed port. Snug tighten the plug of the air
bleed port. Set the engine at a low idle, and run it until
oil oozes from the air bleed port. After checking that oil
has oozed, fully tighten the air bleed plug.
With the engine at a low idle, perform swing operation
slowly right and left at two or more revolutions.
Attachment cylinders
Start the engine and run it at low idle speed. Extend and
retract the attachment cylinder rods four or five times
without bringing them to end of stroke. Then repeat
the operation three or four times, this time bringing the
cylinder rods to end of stroke.
6 - MAINTENANCE
6-72
4
SMIL15CEXY651AA
5
SMIL15CEXY652AA
6
SMIL15CEXY508AB