Komatsu F30791, Руководство по ремонту

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PC27R-8
20-41
TESTING AND ADJUSTMENTS
CONTROL AND REGULATION OF THE PRESSURES
IN THE HYDRAULIC CIRCUITS
1. Control of operating 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:
35 w 5 kg/cm
2
(34.3 w 4.9 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 of the working
equipment and machine travel
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.
H Normal pressures:
Working equipment and travel:
210 10 kg/cm
2
(206 10 bar)
3. Check the operating pressure of the turret
swing
1 - Set the main relief valve of the control valve to a
value higher by 20 bar than the maximum pres-
sure to be checked.
2 - Remove the caps (1) of the swing motor and
mount the pressure adapters.
3 - Connect a pressure gauge E2 (400 bar) or E3 (600
bar).
Insert the turret swing locking-pin.
4 - Start the engine and bring it up to high idling.
5 - Check the pressure for a swing to the right and a
swing to the left, bringing the lever of the left-hand
PPC valve to the end of its stroke and with the
pressure stabilized.
H Normal pressure:
215 5 kg/cm
2
(211 5 bar)
6 - Restore the setting of the main relief valve.
PC20R-8 PC27R-8
RKPA2250
1
E
1
RKPA2260
1
E
3
RKPA3870
A
RKPA2270
1
E
3