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| Illustration 1 | g01279887 |
Hydraulic schematic for travel hydraulic system (1) Right travel motor (2) Left travel motor (3) Swivel (4) Right travel control valve (5) Left travel control valve (6) Main control valve (7) Drain from travel motors (8) Pilot oil for two-speed valves on travel motors (9) Oil that is supplied to the main control valve (10) Oil that is supplied to the main control valve (11) Main hydraulic pump (12) Solenoid valve for two-speed travel | |
The right travel motor (1) and the left travel motor (2) are supplied with oil from the piston and gear pump (11) through the main control valve (6) and the swivel (3).
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| Illustration 2 | g01176804 |
Travel motor (2) Left travel motor (13) Counterbalance valve | |
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| Illustration 3 | g01178727 |
Travel drive (14) Left track (15) Sprocket (16) Left final drive | |
Oil is supplied to the left travel motor (2) by the left pump through the swivel. Oil is supplied to the right travel motor by the right pump through the swivel. When the left pump supplies hydraulic oil to the left travel motor, the motor rotates and the motor torque is transferred to final drive (16). The final drive reduces the output speed of the travel motor and the final drive increases the output torque of the travel motor. Final drive (16) transfers the increased torque to left track (14) through sprocket (15).
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| Illustration 4 | g01174579 |
Right side of cab (17) Two-speed travel switch | |
The travel speed can be controlled through fine movements of the travel levers/pedals. The travel speed can also be set to LOW SPEED or HIGH SPEED through the use of the two-speed travel switch (17). The machine will travel at LOW SPEED until the operator slides the switch to the high speed position. The machine will then move into HIGH SPEED mode. The HIGH SPEED mode is recommended for travel on a flat surface. During gradual downhill travel, the mode may be set to HIGH SPEED for high mobility.
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| Illustration 5 | g01279891 |
Travel operation (1) Right travel motor (2) Left travel motor (17) Two-speed travel switch (18) Left travel control lever (19) Right travel control lever (20) Idler (21) Forward direction (22) Reverse direction | |
The direction of machine movement is determined by the direction of the machine's lower structure. For normal operation, the idlers (20) are toward the front of the machine and travel motors (1) and (2) are toward the rear of the machine. When the machine is arranged for normal travel and control levers (18) and (19) are pushed forward, the machine moves forward. The machine travels backward when the control levers are pulled backward. If the upper structure is turned 180 degrees, the operating directions for the travel levers are reversed.
When the machine is in the normal travel position and when one of the travel levers/pedals is moved forward, the respective track travels forward. The machine turns because the stationary track acts as the pivot point. This type of turn is called a pivot turn.
The machine will perform a spot turn in order to change the travel direction within a narrow space. To perform a spot turn, move one travel lever/pedal to the rear and move the other travel lever/pedal forward at the same time. The machine will spot turn around the center axis of the machine.
ReferenceRefer to the Operation and Maintenance Manual, "Travel Control" for more information on the operation of the travel levers.