Takeuchi TB53FR, Руководство по ремонту

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HYDRAULIC UNITS
SOLENOID VALVE
IV-58
TB53FR
OPERATION
This valve is a compound valve consisting of sole-
noids that control the operation as follows: Solenoids
A and B switch the auxiliary hydraulics. Solenoid 1
stops the boom offset.
Solenoids 2 and 3 are operated to prevent the boom
from interfering with the cab when the boom is raised.
These solenoids actuate the pressure reducing valve
to decelerate the boom in the deceleration area when
the boom is raised and actuate the flow control valve
in the boom stop area to relieve the shock when the
boom is stopped.
Solenoids A, B, 1
When the solenoid is not electrified
The oil in the port P is blocked by the spool (1). As the
port A and port T are connected, the downstream pilot
circuit has the same pressure as the tank pressure.
When the solenoid is electrified
A magnetic field is generated around the coil. The
push rod (2) is pulled down to press down the spool
(1), then the oil in port P flows into port A and conveys
the pressure to the downstream pilot circuit.
C4D901
T
A
1
P
C4D902
A
1
P
2
SOL A, B
SOL 1
SOL 2, 3
Auxiliary Hydraulics
Stops Left Offset
Stops Boom Raise,
Decelerates Boom Raise