Despite the agreement in Geneva last week between Secretary of State George P. Shultz and Soviet Foreign Minister Eduard Shevardnadze on substantive aspects of the intermediate-range nuclear forces (INF) treaty, the Soviets still have not provided details on the number and location of their INF weapons that are needed to complete the treaty, U.S. officials said yesterday.

Chief U.S. negotiator Max M. Kampelman told reporters "there is a hangup" regarding the information, although neither he nor chief U.S. INF negotiator Maynard W. Glitman thought it was serious.

The superpowers agreed long ago to exchange the missile information before the negotiations ended, in order to establish a "baseline count," or starting point, for the three-year period in which INF weapons will be eliminated.

The exchange is needed because the treaty, to be signed by President Reagan and Soviet leader Mikhail Gorbachev in Washington next Tuesday, permits both sides to inspect at the outset of the three-year period all of the specified storage and deployment sites for medium-range and shorter-range missiles.

Shultz told reporters last Wednesday that the chief of the Soviet General Staff, Marshal Sergei Akhromeyev, assured him in Geneva that the remaining details would be provided by the end of last week.

When asked about Shultz's statement, Kampelman said, "We've got more data than we had" last week "but we still don't have it all."

Other officials said the Soviets still have not specified the location of a few SS20 missiles, a detail needed to identify in the treaty the location of potential U.S. inspections.

Kampelman said "no treaty can be signed" without the additional details the Soviets agreed to supply. But he predicted that the delay was "a momentary thing," despite earlier Soviet delays.

Some U.S. officials believe the delays were brought about by an unusual division of responsibility among Soviet military forces, requiring that the information be gathered from disparate, and perhaps reticent, sources.

"I think our system of managing {the information} is different from theirs," Kampelman said. "Whereas, we were able, rather rapidly, to assemble the data . . . I think they've had to extend themselves in order to gather the data from a variety of sources."

But other officials have speculated that the Soviets deliberately delayed specifying the location of their remaining missiles so they could first be moved away from sensitive military facilities that would otherwise be subject to U.S. inspection.

The only other detail remaining to be worked out, U.S. officials said, is detailed treaty language governing continuous monitoring of the U.S. missile plant in Magna, Utah, formerly involved in the production of Pershing II medium-range missiles, and the Soviet missile plant in Votkinsk, near the Ural mountains, formerly involved in production and assembly of the SS20.