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HYDRAULIC UNITS
PILOT VALVE
IV-66
TB53FR
OPERATION
The pilot valve casing contains a vertical shaft hole
with a reducing valve incorporated into it. When the
handle is tilted, the push rod and spring seat are
pushed down changing the secondary pressure spring’s
pressure.
The casing also contains an inlet port for hydraulic oil,
port P (primary pressure), and an outlet port, port T
(tank), and secondary pressure is taken from 4 ports,
port 1, port 2, port 3 and port 4, on the bottom of the
vertical shaft hole.
When the Handle is in Neutral
In this case, the force of the secondary pressure setting
spring, which determines the pilot valve’s output
pressure (secondary pressure), is not transmitted to
the spool. Therefore, the spool is pushed up by the
return spring and is in the output port C position
shown above, with oil not flowing between port P and
the output port C but flowing between the T port and
output port C.
When the Handle is Tilted
When the handle (1) is tilted and the push rod is
pushed, the spool moves downward and port P and
port A are joined. The oil in the pilot valve pump flows
out to port A, generating pressure.
When the pressure in port A is the same as the set force
of the spring (set pressure), there is a balance between
the hydraulic pressure and the spring force.
When the pressure in port A is greater than the set
pressure, port A and port P close and port A and port
T open.
When the pressure at port A is lower than the set
pressure, port A and port P open and port A and port
T close.
In this way, the secondary pressure is kept constant.
WHEN TILTED
WHEN IN NEUTRAL
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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