"Kept shoulder to wheel" is a phrase that means to work hard and stay committed to a task. There are several synonyms for this phrase, including "persevered," "labored diligently," "stayed dedicated," "remained focused," and "held steadfast." These phrases all convey the idea that one worked tirelessly and did not give up. Other synonyms include "maintained effort," "continued exertion," "persisted in effort," "strived with determination," and "worked with tenacity." No matter which synonym is used, the message is clear: the individual in question put forth a great deal of effort to accomplish their goal.