Developer Donald Trump`s four leading bank lenders tentatively agreed Tuesday to lend him $65 million and defer interest and principal payments on about $850 million of his nearly $2 billion of debt for five years, said people involved in the talks.

The leading bank lenders-Citibank, Bankers Trust, Chase Manhattan Bank and Manufacturers Hanover-now must persuade other loan syndicates to approve the new loan package.

Japanese banks having a large share of Trump`s existing loans from the Citibank and Chase Manhattan syndicates are regarded as central to the plan`s success.

''The final judgment will now have to be rendered by the Japanese,'' said one banker.

The plan calls for loans of $18.2 million each from Citibank and Bankers Trust, $9 million from Chase Manhattan and $7 million from Manufacturers Hanover.

Two New Jersey institutions also will lend heavily: First Fidelity Bancorp, $5.5 million; and Midlantic Banks Inc., $2 million. Britain`s National Westminister Bank is expected to contribute about $5 million.

Principal and interest payments on all Trump`s bank debts would be deferred for as long as five years, except for his Plaza Hotel in New York;

the Trump Shuttle airline; Trump Tower, a Fifth Avenue residential and business skyscraper, and Trump`s Castle Hotel & Casino in Atlantic City.

The bank debt on those assets will not be rolled over.

The new loan package will be secured by nearly every asset in Trump`s empire, sources said.

Although some details are still being worked out, several bank representatives said they believe any final plan would closely resemble this one. Since negotiations began two and a half weeks ago they have been fluid and

Sources said it still is possible for a single bank to thwart agreement by rejecting the plan, which permits Citibank to apply any equity in the Plaza Hotel to back up its loan on the Trump Shuttle.

Last week, the four major lenders reached a preliminary agreement in which they said they would lend Trump $60 million and roll over much of his bank debt in a package that would be primarily secured by one of the developer`s Atlantic City casinos, the Trump Plaza.

But over the weekend a dispute developed among the leading lenders, and Bankers Trust and Citibank demanded much more collateral to secure their new loans.

By Tuesday evening, the two banks were granted their demands by the other banks.

The interest on the approximately $850 million or so of Trump`s bank debt that will be deferred will accrue at 1 percent above the London Interbank Offered Rate, or LIBOR, the basic short-term rate of interest in the Eurodollar market that is similar to the U.S. prime rate.