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3-18
3
TRAVEL MOTOR
FUNCTION
Swash plate
The swash plate (5) has three planes of A, B and C, as
shown in the figure, and it is mounted to the flange holder
(6) in such a way that its angle of inclination to the flange
holder (6) can be changed by means of the two steel balls
(7).
When the 2nd speed control valve is switched to the 1st
speed side, the swash plate control piston chamber (3) is
connected to the tank port. Also, the swash plate (5) is
stabilized at the surface “A” by the forces of the piston as-
sembly (8), resulting in the angle of “
α
” that can run the
motor at the 1st speed.
When the 2nd speed control valve is switched to the 2nd
speed side, the swash plate control piston chamber (3)
is connected to the motor drive pressure port. Also, the
swash plate (5) is stabilized at the surface “B” due to the
equilibrium between the force of the springs (9), (10) and
the force of the 2nd speed control piston (11), resulting in
the angle of “
β
” that can run the motor at the 2nd speed.
When the engine is stopped, the pilot pressure of the 2nd
speed control valve is cut off, so the swash plate (5) is sta-
bilized at the surface of “A” with the angle of “
α
”, resulting
in the 1st speed side. For this reason, when starting the
engine, the motor always is set to the 1st speed.
Automatic 2-speed switching system
When a load greater than the set value is applied to the
travel motor during traveling in the 2nd (high) speed, the hy-
draulic pressure working on the counter balance, passage
(1) and the valve becomes high. This moves the valve (2) to
the left. Once the valve (2) is moved to the left, the pressure
oil that has been flowing through the shuttle valve (12) and
the valve (2) to work on the piston (11) is now flowing into
the tank passage. The piston (11) returns, and the motor is
switched to the 1st (low) speed.
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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...