Pekin (Ill.) Firefighters Pension Fund hired Mitchell, Vaught & Walker to manage its $11 million pension plan, said Charles E. Lauss, pension board president. Plan officials terminated Hoisington, which ran $6.5 million in active domestic fixed income; 1838 Investment Advisors, $1.5 million in active domestic large-cap core equities; Oppenheimer Capital, $839,000 in active domestic large-cap value equities; and Alliance Capital, $775,000 in active large-cap growth equities. The remaining assets in the plan were in mutual funds, about which Mr. Lauss could not provide details. The plan also terminated consultant Smith Barney, he said; it is not searching for a new consultant. The terminations were not performance-related; plan officials want to reduce cost and change to a less risky, more diversified strategy, he said.