According to legal documents obtained by The Blast, Pasdar is challenging a ruling he won't receive any spousal support from the singer, as per the terms of a "valid enforceable agreement" he accepts he signed in 2000.
The actor does agree that both he and his soon-to-be ex will retain ownership of the property that was theirs before the marriage and that the royalties from their respective work remain separate.
"Natalie's assets and income are far greater than Adrian's," his attorney writes. "At present, Adrian lacks the financial resources from which to support himself and their children at a level anywhere near the marital standard."
Maines, who filed for divorce in June, has accused Pasdar of trying to drag out the divorce, urging the judge overseeing the case to sanction him for the delay.
The judge recently informed Maines her divorce will be dismissed if the former couple doesn't hurry up and sign off on a legal split.
The country star has requested and won joint custody of the couple's two sons, Jackson Slade, 16, and 12-year-old Beckett Finn.
Natalie wed Adrian in Las Vegas in 2000. The couple reportedly met at Dixie Chicks star Emily Robison's 1999 wedding.
This is Maines' second failed marriage - she wed her South Plains College boyfriend, bassist Michael Tarabay, in 1997, but filed for divorce two years later.