3-20
3
SLEW MOTOR
FUNCTION
3MAA01Z
B
F
F
F
F2
F2
F2
F
F1
F2
D
C
1
2
3
4
5
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SLEW MOTOR
Hydraulic motor
The cylinder block (1) is constructed with the pistons (2),
and its end surface comes in contact with the valve plate
(3) containing two half-moon-shaped ports B and C. The
cylinder block (1) rotates freely and is connected to the
drive shaft (4) via the spline. On the other hand, the swash
plate (5) is fixed to the housing.
When the high-pressure oil is led to the port B, the pistons
(2) push the swash plate (5) with the force F per piston.
F = P x A P: Pressure A: Piston sectional area
The force F used to push the swash plate (5) by the pistons
(2) is divided into two: the force F1 that pushes the plate
and the force F2 that rotates the cylinder block (1). The total
sum of the components in the direction of rotation of the
high-pressure side piston generates a rotational force in the
cylinder block (1), and via the spline, the torque is transmit-
ted to the shaft (4), turning it. Conversely, if high-pressure
oil is introduced to the port C, the rotation is the reverse of
the above.
Relief valve
This relief valve is equipped with shockless function and
works in two stages.
The 1st stage
When the relieving operation starts, the pressure P1 in the
chamber B is kept low, while the pressure P in the chamber
M becomes high due to the oil flowed into it.
At this time, there are two forces acting on the poppet (10):
the force F which moves the poppet (10) to the left, the
force (F1) which pushes seat against the right side. Since F
= P x A, F1 = P1 x A1, P > P1 and A > A1, the poppet (10)
is moved to the left by this force “F-F1”, and the pressure
is released from the chamber M through the passage in the
supply side. That is, during the time piston (11) is moving to
its stroke end, the relief valve operates at low pressure.
The 2nd stage
When the piston (11) reaches the stroke end, the pressure
in the chamber B increases and becomes equal to that of
the chamber M. At this time, the force moving the poppet
(10) to the left side becomes “P = P1” and thereby “A-A1”.
This allows the relief valve to operate at the specified set
pressure.
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Summary of Contents for TB 250
Page 1: ......
Page 3: ...1 1 SAFETY 1 Safety alert symbol 1 2 Safety precautions 1 3 Cautions when working 1 9...
Page 36: ...2 24 2 TIGHTENING TORQUE SERVICE DATA...
Page 38: ...2 26 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with options 2 2...
Page 39: ...2 27 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 1 2...
Page 40: ...2 28 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 2 2...
Page 41: ...2 29 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 1 2...
Page 42: ...2 30 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 2 2...
Page 49: ......
Page 59: ...2 46 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 60: ...2 47 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 61: ...2 48 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 62: ...2 49 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 63: ...2 50 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 64: ...2 51 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 65: ...2 52 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 66: ...2 53 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 67: ...2 54 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 68: ...2 55 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 69: ...2 56 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 70: ...2 57 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 71: ...2 58 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 72: ...2 59 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 73: ...2 60 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA NAME STANDARD NO...
Page 74: ...2 61 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 75: ...2 62 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 76: ...2 63 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 77: ...2 64 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 78: ...2 65 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 79: ...2 66 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 80: ...2 67 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 81: ...2 68 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 92: ...3 11 3 CONTROL VALVE FUNCTION...
Page 108: ...4 3 4 SERVICE STANDARDS DISASSEMBLY AND ASSEMBLY Clearance for pin and bushing...
Page 352: ...ENGINE 6 Machine model Mounted engine TB250 4TNV88...