Note: The following models have straight travel control: 318C, 319C, 320C, 322C, 325C and 330C. The 312C, 315C and 321C have hydraulically controlled straight travel control.
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| Illustration 1 | g00686464 |
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(1) Controller (2) Implement swing pressure switch (3) Travel pressure switch (right) (4) Travel pressure switch (left) (5) Pressure switch for the straight travel pedal (6) Straight travel solenoid |
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| Illustration 2 | g00839056 |
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Straight Travel Controller Of 321C (1) Controller (2) Implement swing pressure switch (3) Travel pressure switch (right) (4) Travel pressure switch (left) (5) Straight travel solenoid valve |
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The straight travel solenoid is energized and the hydraulic circuit for straight travel is active when one of the following conditions occur:
- The travel pressure switch (right), the travel pressure switch (left) and the implement swing pressure switch are simultaneously activated.
- The pressure switch for the straight travel pedal and the implement swing pressure switch are simultaneously activated.
When the conditions above are active, the ECM wiil energize the straight travel solenoid. Then the straight travel valve will divert hydraulic pressure from the right hydraulic pump to both travel motors. The left hydraulic pump will supply the pressure to operate the implements and swing functions. This mode of pump operation will prevent any pressure differential between the right travel motor and the left travel motor which will enable the machine to travel straight.