TM 9-2320-209-10-2/TO36A12-lB-1091-2 Table 1–1. Operator/Crew Preventive Maintenance Checks and Services-Cont NOTE: These checks are to be made in the order listed, within designated internal. B–Before operation A–After operation M–Monthly D–During operation W–Weekly Interval Item to be Inspected Equipment is Item Procedure: Check for and have repaired, filled, not ready/ No. B D A W M or adjusted as needed available if INTERIOR OF VEHICLE 13 INSTRUMENTS If buzzer stops and air pressure reading is below 65 psi, there maybe no braking ac- tion. Shut down engine and check to see what is wrong. Failure to do so may re- sult in injury or death to personnel. ● a. Start engine and run at idle speed (650 -850 Engine is RPM) to let it warm up. Listen for air buzzer. inoperative. Air buzzer will not come on. Air buzzer will not shut off above 66 psi or will not come on at ap- proximately 60 psi and remain on with decreasing air pressure. ●❵ b. Listen for unusual noise or vibration. There is unusual noise or vibration. 1-10 Change 2