Central Maintenance Corp. Copyright 2010 Designed and Hosted by: ScottysWeb Standard Services Standard Service Hours Central Maintenance Corporation labor rates evolved from its very own Standard Service Hours policy. In other words we have written our own policy outlining labor hours for every type of service. CMC policy dictates we charge our customers by our SSH policy even if unforeseen problems result in the service taking longer. Since our SSH are below industry average our customers enjoy the lowest labor rates of any other fleet maintenance company. Click here to view CMC Parts Limited Warranty