3-21
3
SLEW MOTOR
FUNCTION
Make-up valve
The makeup valve has two functions:
One function is to prevent the slewing structure from run-
ning away by preventing the cavitation caused by overrun
of the piston motor.
The inertia of the slewing mechanism rotates the motor,
pumping up the oil. When this rotational speed exceeds
the rotational speed achieved by the oil volume supplied to
the motor, the shortfall in oil volume is replenished through
the makeup valve (1) to the motor main circuit to prevent a
vacuum from being generated in the circuit.
The other function is to obtain the normal braking function
by keeping the circuit in the normal state. When the circuit
between the motor and the control valve is closed, as in
braking, the oil from the motor drain, as well as the leak
from the valve, is replenished through the makeup valve (1)
to prevent a vacuum from being generated in the circuit.
Anti-rebound valve
When the motor is stopped, it is prevented from rebound-
ing due to the accumulated pressure, by connecting the
main circuit of the motor to the make-up circuit for a certain
period.
When the brake is actuated
The braking pressure generated at the port Pv1 moves the
check valve (2) to the right until it is pushed against the sec-
tion B. Thus, the oil flow is blocked at the section B.
When the Motor Rebounds
When the motor is stopped by braking operation of the
brake valve, it starts rebounding due to the accumulated
pressure in the main circuit. This rebound pressure gener-
ated at the port Pv2 moves the sleeve (3) to the left to open
the passage. The rebound pressure is released from the
port Cv.
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Summary of Contents for TB 250
Page 1: ......
Page 3: ...1 1 SAFETY 1 Safety alert symbol 1 2 Safety precautions 1 3 Cautions when working 1 9...
Page 36: ...2 24 2 TIGHTENING TORQUE SERVICE DATA...
Page 38: ...2 26 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with options 2 2...
Page 39: ...2 27 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 1 2...
Page 40: ...2 28 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 2 2...
Page 41: ...2 29 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 1 2...
Page 42: ...2 30 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 2 2...
Page 49: ......
Page 59: ...2 46 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 60: ...2 47 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 61: ...2 48 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 62: ...2 49 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 63: ...2 50 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
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Page 73: ...2 60 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA NAME STANDARD NO...
Page 74: ...2 61 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 75: ...2 62 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 76: ...2 63 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
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Page 80: ...2 67 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 81: ...2 68 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 92: ...3 11 3 CONTROL VALVE FUNCTION...
Page 108: ...4 3 4 SERVICE STANDARDS DISASSEMBLY AND ASSEMBLY Clearance for pin and bushing...
Page 352: ...ENGINE 6 Machine model Mounted engine TB250 4TNV88...