Answer :
Final answer:
The most likely cause for a crawler tractor with a clutch and brake steering system to track left consistently is the engagement of the brake on the right side.
Explanation:
If a crawler tractor with a clutch and brake steering system is tracking to the left all the time, one possible cause could be uneven track tension. However, looking at the options provided, brake engagement on the right side is the most likely culprit. If the brake is partially or fully engaged on the right side, it would cause the tractor to veer or track left consistently. This is due to the differential in rotational speeds between the left and right tracks. The other options listed, such as clutch disengagement on the left side or misalignment of the differential steering valve, could also affect the steering but are less likely to cause consistent leftward tracking without additional symptoms.
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