Komatsu Utility PC12R-8 MISTRAL, Shop Manual

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20-41
TESTING AND ADJUSTMENTS
CONTROL AND REGULATION OF THE PRESSURES
IN THE HYDRAULIC CIRCUITS (PC15R)
1. Control ofoperating pressure (unloading valve)
1 - Remove the plug (1) of pump P1 and mount a
pressure adapter.
2 - Connect a pressure gauge E1 (60 bar).
3 - Start the engine and bring it up to high idling with
all levers in neutral position.
4 - Check the pressure.
H Normal pressure:
20 10 kg/cm
2
(19.6 9.8 bar)
The unloading valve cannot be re-adjusted. If
the pressure differs from the normal value the
valve must be substituted.
2. Control the operating pressures ofthe working
equipment, machine travel, and swing
1 - Remove the plug (1) of pump P1 and mount a
pressure adapter.
2 - Connect a pressure gauge E2 (400 bar) or E3
(600 bar).
3 - Start the engine and bring it up to high idling.
4 - Check the pressure for each movement with the
command lever at the end of its stroke and with
the pressure stabilised.
To check the pressure of the working equip-
ment, push the piston to the end of its stroke.
To check the pressure of machine travel, in-
sert a block " A " between the chassis and
the sprocket wheel.
To check the pressures of the swing, insert
the swing lock.
H Normal pressures:
Working equipment and travel:
210 10 kg/cm
2
(206 10 bar)
Swing: 125 10 kg/cm
2
(123 10 bar)
PC12R-8 PC15R-8
RKPA0310
E
1
1
RKPA0320
1
E
3
RKPA0270
A