Maryland Republican gubernatorial candidate Robert A. Pascal said yesterday that he will lend $100,000 of his own money to his financially strapped campaign, which, with less than six weeks before the election, cannot afford to buy crucial television advertisements.

Pascal is hoping that three major fund-raisers scheduled for the next two weeks, combined with his own contribution, will give him the money he needs to begin television ads in the Washington and Baltimore markets during the second week of October. So far, Pascal, trailing incumbent Democratic Gov. Harry Hughes by a considerable margin in recent polls, has had commercials on television for two weeks during July.

"I think there is still about $400,000 out there for the two gubernatorial candidates and I hope to receive half of that in contributions," said Pascal, who has already contributed $15,000 to his race. "Those contributions combined with what I give myself should give us enough. We'll do whatever we have to do so that we have enough money to win this election."

Hughes expects to raise between $300,000 and $400,000 for the general election, which will bring the governor's total fund-raising in his reelection effort to about $1 million. Only $15,000 of that amount has been in loans.

Hughes has scheduled a fund-raiser for Oct. 13 in Baltimore at which he hopes to raise at least $150,000. Hughes campaign manager Joseph M. Coale III said yesterday it is the only major fund-raiser planned. "People are cocktailed and Swedish meatballed out," he said.

Coale said most of the Hughes money was raised at small dinners that cost $500 or $1,000 per couple. Hughes also plans to mail 18,000 fund-raising letters this week, 10,000 of them to lawyers and 8,000 to potential women contributors.

Of Pascal's planned $100,000 loan to himself, Coale said, "It's crazy," adding that he thought the loan would hurt Pascal's fund-raising efforts because it would show that he cannot raise enough money from contributors.

Pascal had hoped for some postprimary financial backing from the Republican National Committee, but he said he no longer expects any financing from the national party beyond the $20,000 given to him during the summer. A poll that the RNC had planned to take after the primary also has been canceled.

According to his 1981 tax return, Pascal has access to a trust fund from his wife's family that generates about $200,000 a year. Pascal has refused to release tax returns prior to 1981, saying they contain no information that was not on the 1981 form.

Hughes has released tax statements for the last four years and has suggested that Pascal do the same.

"All you get is 1981," Pascal said. "My wife has a considerable income and she is entitled to her privacy. If the Hughes people want to make that an issue, let them. I dare them to make it an issue."

Pascal denied that his decision to lend such a large amount of money to himself indicates the campaign is in financial difficulty. But he did concede that, "ideally," his television commercials should be on the air right now.

When Pascal's TV commercials start, at least one of them will include U.S. Sen. Charles McC. Mathias. However, Pascal said he has no plans to include Lt. Gov. Samuel W. Bogley in a commercial. Bogley will appear in a commercial for Republican senatorial candidate Lawrence J. Hogan.

"I have not yet met with Sam Bogley and I don't know when I will," Pascal said. Asked if he welcomed Bogley's support, Pascal said, "I welcome anyone's support."