Montgomery County teachers have ratified a revised contract that would give them a 6 percent pay raise next year, 1 percent less than they negotiated last winter.

In a vote of 3,728 to 713, the members of the Montgomery County Education Association agreed to the lower salary increase, worked out last week by an independent mediator.

Earlier this month, the county Board of Education decided to cut raises to help absorb $17 million in cuts by the County Council in the schools' 1990-91 budget.

If approved by the school board at a special meeting tonight, the new contract will give Montgomery's 7,200 teachers a 5 percent raise for the first half of next year and a 7 percent raise for the second half. In the following year, salaries would rise by 6.5 percent. Benefits for members of health maintenance organizations also would be reduced.

In addition to the renegotiated contract, the board is expected to vote tonight on other means of balancing its budget for the fiscal year that starts next month.

The measures are likely to include the elimination of "a significant number of positions, including a sizable number with people in them now," said a school spokesman, who predicted the cuts would be made primarily in administrative jobs.