Last week, Mayor Edward I. Koch made an impromptu visit to the hospital bedside of his old friend, Queens Borough President Donald R. Manes. "I hugged him, and I kissed him on the forehead," the mayor told reporters afterward. Koch said he told Manes, "Don't worry about anything, Donny, we all love you." On Sunday, five days after the hospital visit, Koch appeared on a local television show, called Manes "a crook" and said he should be removed from office. "I feel violated," the mayor said. "I feel as though a friend had assaulted me physically." No charges have been filed against Manes, the burly politician who runs the 1.9 million-resident borough and has been a Koch ally for more than two decades. But last week, a Manes protege was charged with extortion and Manes was accused in print of extorting $36,000 from a Queens lawyer who unburdened himself to Daily News columnist Jimmy Breslin and is bargaining with federal prosecutors. "In the court of public opinion," Koch said, "I think it's been established that Manes was involved in that corruption, and therefore he must go." Koch's abrupt turnaround is only the most obvious symptom of the anxiety that has gripped his administration since the night two weeks ago when Manes was found in his car, weaving down a highway and bleeding, near death from a slashed wrist. The suicide attempt came the day before Geoffrey Lindenauer, deputy director of the city's Parking Violations Bureau and a close Manes associate, was charged with extorting $5,000 from a company that collects parking fines for the city. Manes had recently recommended Lindenauer for promotion to bureau chief. A grand jury convened by U.S. Attorney Rudolph Giuliani heard testimony last week and today from city officials and businessmen in a probe that has widened to other city agencies. Giuliani has said hundreds of thousands of dollars were extorted by Parking Bureau officials. The probe also has raised the question of whether city agencies are the province of political machines. "Patronage is part of the coin of the realm in government," City Councilwoman Ruth Messinger said. "The mayor may be correct in saying that he has not insisted that his commissioners hire specific people recommended to him, but he cannot absolve himself of responsibility for the quality of people his commissioners hire." The city's housing agency and its Taxi and Limousine Commission are dominated by Brooklyn politicians, she said, and other transportation agencies such as Ports and Terminals, Marine Aviation and the Bureau of Ferries are considered to be full of patronage appointees. In his television appearance on WNBC, Koch said that if Manes does not resign this week, "There's no question in my mind that the governor is going to have to suspend him, as he is able to do, for a 30-day period and begin proceedings to remove him." Gov. Mario M. Cuomo dismissed that statement today, saying, "No formal charges have been yet filed against Donald Manes. All you have so far is a newspaper story, or a series of them. The prosecutor hasn't done anything. Obviously, it would be a mistake to do anything that compromised a prosecution." Richard Emery, counsel for the New York Civil Liberties Union, said the group was considering filing a complaint against Koch with the New York Bar Association. "He is tampering with the presumption of innocence in an indefensible manner," Emery said. "In his zeal to distance himself from the political scandal now occurring, he is abdicating his responsibility to the public not to influence any potential jurors and judicial proceedings," he added. Manes, who went home from the hospital Saturday, remained in seclusion. His lawyer, Michael Armstrong, said in a news conference today that Manes suffered "a massive heart attack" while in the hospital and was not being permitted to see reporters to avoid stress. "The mayor has convicted Donald Manes in what he says is the court of public opinion," Armstrong said. "But even in that court, there are some standards of compassion and decency . . . . The only evidence is a hearsay statement of a confessed briber who is trying to make a deal for himself," he said. According to the Breslin column, Queens lawyer Michael Dowd, a former law partner of U.S. Rep. Thomas J. Manton (D-N.Y.) and a former Cuomo campaign manager, started a collection agency and asked Manes for business. Manes told him to pay a percentage of his earnings to Lindenauer, Dowd said.