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HYDRAULIC UNITS
SLEW MOTOR
IV-124
TB53FR
The rebound pressure also pushes the check valve (1)
to the left, which is the opposite direction of pushing
at the time of braking. The flux control valve built in
the check valve (2) (that is now on the lower pressure
side) releases the oil in the damper chamber (4) at a
constant flux. Therefore, the check valve (1) moves at
a constant speed. When the check valve reaches its
stroke end, the passage from the port Pv2 to the port
Cv is closed.
Timer Valve
This function is used to prevent sudden operation of
the parking brake when the motor is stopped.
At the time of parking brake operation, pressure oil
from the port P4 is supplied at all times to the port PG,
the valve spool (1) is pushed to the right by the force
of the spring (2), and the port PG is closed.
When turning pilot pressure or arm pilot pressure is
led to the port SH, the spool (1) is moved to the left
against the force of the spring (2), and the port PG is
opened. The pressure oil from the port PG passes
through the hole at the center of the spool (1) and is led
to the parking brake release port (PB), so that the
parking brake is released.
When the pilot pressure at the port SH disappears, the
spool (1) is moved by the force of the spring (2) to the
right, the port PG is closed, and the oil in the brake
piston chamber (3) is prevented from escaping. The
oil in the chamber flows gradually through the ori-
fices (4), (5) in the spool (1) to the drain port dr, so that
the parking brake is not applied rapidly, but after a
certain time, just as if a timer were used.
G4D606
Pv1
Cv
Pv2
1
2
4
K3D607
1
2
PG
PB
SH
K3D608
1
2
5
4
3
PG
Summary of Contents for TB53FR
Page 1: ...0 1 TB53FR...
Page 2: ...0 2 TB53FR...
Page 3: ...0 3 TB53FR...
Page 6: ...0 6 TB53FR...
Page 8: ...0 8 TB53FR...
Page 9: ...I 1 TB53FR I GENERAL...
Page 24: ...GENERAL I 16 TB53FR...
Page 25: ...I 17 TB53FR II SPECIFICATIONS II 1...
Page 53: ...II 29 TB53FR III MACHINE CONFIGURATION III 1...
Page 60: ...MACHINE CONFIGURATION DRIVE SYSTEM III 8 TB53FR...
Page 68: ...MACHINE CONFIGURATION TRAVEL SYSTEM III 16 TB53FR...
Page 74: ...MACHINE CONFIGURATION UPPER FRAME III 22 TB53FR...
Page 80: ...MACHINE CONFIGURATION CONTROL SYSTEM III 28 TB53FR...
Page 86: ...MACHINE CONFIGURATION ATTACHMENTS III 34 TB53FR...
Page 88: ...III 36 TB53FR HYDRAULIC SYSTEM MACHINE CONFIGURATION...
Page 92: ...TB53FR MACHINE CONFIGURATION ELECTRICAL SYSTEM III 40...
Page 94: ...MACHINE CONFIGURATION ELECTRICAL SYSTEM III 42 TB53FR...
Page 110: ...MACHINE CONFIGURATION INTERFERENCE PREVENTION SYSTEM III 58 TB53FR...
Page 111: ...III 59 TB53FR IV HYDRAULIC UNITS IV 1...
Page 144: ...HYDRAULIC UNITS HYDRAULIC PUMP IV 34 TB53FR...
Page 166: ...HYDRAULIC UNITS CONTROL VALVE IV 56 TB53FR...
Page 186: ...HYDRAULIC UNITS PILOT VALVE IV 76 TB53FR INSPECTION AND ADJUSTMENT IV 71 TROUBLESHOOTING IV 72...
Page 267: ...IV 157 TB53FR V TROUBLESHOOTING V 1...
Page 313: ...V 47 TB53FR VI ENGINE...
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