Nailen,
I have seen the repercusions of well intentioned shop floor guys taking the reigns when it comes to managing TPM, My experience tells me that top management lack of commitment to TPM issues sends a clear voice to the guys in production that they don't give a @#$% about production maintenance and the fact that down time cost to quality outputs regarding TPM does indeed have a negetive effect on the validity of initial project costs.
I would suspect that if you have a formal registered quality system in place, this would be the most logical first step to take in reviewing top management commitment to issues that effect both system and product quality, I have found that using a flow chart approach to forming procedures for TPM issues is an excellent way to have all departments allowed to express input to formalizing a TPM commitment.
Wallace.