TM 10-3930-669-10 Table 23.  Operator Preventive Maintenance Checks and Services - CONT. Location Item Interval Item to Procedure Not Fully Mission No. Check/Service Capable If: DAILY- ENGINE- Continued Continued 9 Before Hydraulic Oil Check hydraulic fluid tank level Level (LO 10-3930-669-12). 10 Before Hydraulic Tank, Check hydraulic lines and fittings for Class III leak present. Lines and leaks or damage. Fittings 11 Before Engine Oil Level Check engine oil level.  Maintain oil level between the "ADD" and "FULL" marks.  Refer to (Para 3-6) and LO 10-3930-669-12. 12 Before Transmission Check oil level dipstick.  Check for Oil Level presence of oil before starting engine. Refer to (Para 3-12) and LO 10-3930-669-12. 2-16