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HYDRAULIC UNITS
TRAVEL MOTOR
IV-100
TB53FR
G4D507
4
G4D508
4
12
Operation 2
Since this relief valve has a shockless mechanism, it
operates in 2 steps.
1st Step
When relief valve operation starts, the pressure in
chamber B (P1) is kept at a pressure which is lower
than that in chamber C while the pressure in chamber
A (P) becomes higher than the pressure of the oil
flowing in.
At this time, there are two forces acting on the poppet
(10), force (F), which attempts to move the poppet
(10) to the left and force (F1) which pushes against the
seat on the right side. Since F = P
×
A, F1 = P1
×
A1,
P > P1 and A > A1, the poppet (10) is moved to the left
by this force “F-F1”.
This opens a supply side circuit from chamber A and
lets the pressure escape. That is, during the time piston
(11) is moving to its stroke end, the relief valve
operates at low pressure (about 1/3 the set pressure).
2nd Step
When the piston (11) reaches the stroke end, the
pressure in chamber B rises and the pressures in
chamber A and chamber B equalize. At this time, the
force moving the poppet (10) to the left side becomes
“P = P1”, so this becomes “A-A1” and the relief valve
operates at the specified set pressure.
2-Speed Mechanism
2-speed control valve
When high-pressure oil led to the port M1 and the
travel 2-speed solenoid valve (1) is set to speed 1, the
chamber C is connected to the tank via the travel 2-
speed solenoid (1), so that a low pressure is obtained.
For this reason, the spool (2) is pushed to the left by
the spring (4), the control chamber (3) and the tank
port (T) are connected, and there is no force pushing
the swash plate (5) in upward direction.
When the travel 2-speed solenoid valve (1) is switched
to speed 2, the pressure oil from the travel 2-speed
solenoid valve (1) flows to the chamber C, the spool
(2) is moved to the right, and the port M1 is connected
with the port A, while the port M2 is connected with
the port B. Then the pressure oil from the port P1
moves the shuttle spool (12) to the right and flows to
the control chamber (3). This causes operation of the
control piston (11), and the swash plate (5) is pushed
up.
At the time of engine stop, no pressure oil is supplied
any longer, and the spring (4) returns the spool (2) to
the speed 1 position.
Содержание TB53FR
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Страница 9: ...I 1 TB53FR I GENERAL...
Страница 24: ...GENERAL I 16 TB53FR...
Страница 25: ...I 17 TB53FR II SPECIFICATIONS II 1...
Страница 53: ...II 29 TB53FR III MACHINE CONFIGURATION III 1...
Страница 60: ...MACHINE CONFIGURATION DRIVE SYSTEM III 8 TB53FR...
Страница 68: ...MACHINE CONFIGURATION TRAVEL SYSTEM III 16 TB53FR...
Страница 74: ...MACHINE CONFIGURATION UPPER FRAME III 22 TB53FR...
Страница 80: ...MACHINE CONFIGURATION CONTROL SYSTEM III 28 TB53FR...
Страница 86: ...MACHINE CONFIGURATION ATTACHMENTS III 34 TB53FR...
Страница 87: ...TB53FR HYDRAULIC SYSTEM III 35 HYDRAULIC SYSTEM HYDRAULIC CIRCUIT DIAGRAM MACHINE CONFIGURATION J1C700...
Страница 88: ...III 36 TB53FR HYDRAULIC SYSTEM MACHINE CONFIGURATION...
Страница 91: ...TB53FR ELECTRICAL SYSTEM III 39 ELECTRICAL SYSTEM ELECTRICAL WIRING DIAGRAM MACHINE CONFIGURATION J1C802...
Страница 92: ...TB53FR MACHINE CONFIGURATION ELECTRICAL SYSTEM III 40...
Страница 94: ...MACHINE CONFIGURATION ELECTRICAL SYSTEM III 42 TB53FR...
Страница 110: ...MACHINE CONFIGURATION INTERFERENCE PREVENTION SYSTEM III 58 TB53FR...
Страница 111: ...III 59 TB53FR IV HYDRAULIC UNITS IV 1...
Страница 144: ...HYDRAULIC UNITS HYDRAULIC PUMP IV 34 TB53FR...
Страница 166: ...HYDRAULIC UNITS CONTROL VALVE IV 56 TB53FR...
Страница 186: ...HYDRAULIC UNITS PILOT VALVE IV 76 TB53FR INSPECTION AND ADJUSTMENT IV 71 TROUBLESHOOTING IV 72...
Страница 267: ...IV 157 TB53FR V TROUBLESHOOTING V 1...
Страница 313: ...V 47 TB53FR VI ENGINE...
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