Komatsu PC500LC-10R Shop Manual page 326

COMPONENT PARTS OF SWING SYSTEM
15: Check valve spring
16: Shuttle valve
SPECIFICATIONS OF SWING MOTOR
Model: KMF230ABE-5
Theoretical delivery: 229.4 cm
2-stage swing relief pressure: 27.9 MPa {285 kg/cm
2-stage swing relief flow rate (low-pressure setting): 260 ℓ/min
2-stage swing relief flow rate (high-pressure setting): 100 ℓ/min
Rated speed: 1413 rpm
Brake releasing pressure: 1.9±0.4 MPa {19±4 kg/cm
FUNCTION OF SWING MOTOR
The swing motor converts the fluid energy of hydraulic oil into rotational mechanical energy and swings the up-
per structure.
SWING PARKING BRAKE OF SWING MOTOR
OPERATION OF SWING PARKING BRAKE OF SWING MOTOR
When solenoid valve is de-energized (swing parking brake is operated)
When the swing parking brake solenoid valve is de-energized, the pressurized oil from the self-pressure reduc-
ing valve is blocked from flowing.
1.
The port (B) is connected to the tank circuit.
2.
The brake piston (7) is pushed down by brake spring (1).
3.
The disc (5) and plate (6) are pressed. Accordingly, the
swing parking brake is applied.
When solenoid valve is energized (swing parking brake is canceled)
The valve is switched when the swing parking brake solenoid valve is energized.
10-232
3
/rev
2
}
2
17: Shuttle valve spring
}
10 STRUCTURE AND FUNCTION
PC500LC-10R