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FUNCTION
CONTROL VALVE
5
3
CONTROL VALVE
3J0AX00
Anti-cavitation valve
This valve is inserted between the cylinder port and the
tank passage. It works to supply oil from the tank to pre-
vent cavitation when the cylinder is operated at a speed
that is too fast for the oil supply to keep up, which would
cause the pressure of the cylinder port to become almost
negative.
Under normal conditions, a pressure is applied to the cyl-
inder port (P), which causes the poppet (1) to remain
closed. A negative pressure arises in the cylinder port
(P). When the pressure drops below that in the tank pas-
sage (T), the poppet (1) is pushed open, allowing oil to
flow from the tank passage (T) and into the cylinder port
(P).
Anti-drift valve
This valve is installed in the head side of the cylinder cir-
cuit of the boom section. It is designed to prevent oil from
leaking into the cylinder head circuit when the spools are
in the neutral position and to decrease the natural drop
of the boom.
Summary of Contents for TB215R
Page 1: ...CC8E005 WETB215R_A XI Seral No 215000003...
Page 3: ...SAFETY 1...
Page 13: ...SERVICE DATA 2...
Page 16: ...SERVICE DATA DIMENSIONAL DRAWING 3 2 DIMENSIONAL DRAWING 2A0AX001 Operating range 2A0AX02...
Page 53: ...SERVICE DATA WIRE HARNESS DIAGRAM 2 2 WIRE HARNESS DIAGRAM 2H0AX00 Body harness 03342 68000...
Page 54: ...SERVICE DATA WIRE HARNESS DIAGRAM 3 2 WIRE HARNESS DIAGRAM 2H0AX00...
Page 55: ...SERVICE DATA WIRE HARNESS DIAGRAM 4 2 WIRE HARNESS DIAGRAM 2H0AX00...
Page 56: ...SERVICE DATA WIRE HARNESS DIAGRAM 5 2 WIRE HARNESS DIAGRAM 2H0AX00...
Page 57: ...SERVICE DATA WIRE HARNESS DIAGRAM 6 2 WIRE HARNESS DIAGRAM 2H0AX00...
Page 58: ...FUNCTION 3...
Page 88: ...DISASSEMBLY AND ASSEMBLY 4...
Page 125: ...DISASSEMBLY AND ASSEMBLY OPERATING DEVICE 6 4 OPERATING DEVICE 4F0AX00 Hydraulic piping...
Page 230: ......
Page 232: ...TROUBLESHOOTING 5...
Page 287: ...Other 6...