"We demand immediate removal of Prof Alok Pandey as the Chief Proctor to ensure an impartial and fair enquiry," it said in a letter to the varsity registrar, in the wake of a complaint filed by the MPhil student Amol Singh about an alleged attack on him by the ABVP members.
A scuffle broke out between two groups of students on July 16 after a meeting was held to condemn the police action against protesters in Jammu and Kashmir.
The varsity's Proctorial Board is conducting inquiry in to the matter.
JAC alleged that Pandey's biased reports on alleged manhandling of Sushi Kumar by members of Ambedkar Students Association in August last year led to action against Vemula and four others.
"The two proctorial committee reports by Alok Pandey have been the basis of suspension of the five Dalit students (including Vemula)," it said.
The biased enquiry and reports by the Chief Proctor in Vemula case puts a question mark on credibility of the Proctorial Board, it claimed.