SUPPLIES AND SERVICE CHART
4-67
HYDRAULIC SYSTEM - AIR BLEEDING
Beyond respecting the maintenance intervals, air
must be bled from the hydraulic system after each
oil change: pumps, engines and cylinders have to
be accurately bled of air. If this is not the case, their
performance during intake and operation will be
seriously affected.
Unscrew the breather plugs (1) on the working
pump and the breather plugs of the slewing pump
(2) on the regulator side, in front of the flange.
Hydraulic oil flows from the tank into the pumps, by
releasing the air outside.
Tighten again the bleeding plugs (1) and (2), as
soon as hydraulic oil starts to flow out from the hole
without air bubbles.
Start the engine and let it run idle and middle speed
for about two minutes.
Extend and retract all hydraulic cylinders repeatedly,
until their movements stop to knock.
Slew the upper structure repeatedly by reversing the
slewing direction.
ENGINE - CHECK AND ADJUSTMENT
OF VALVES CLEARANCE
Consult your Dealer.
100
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