TM 10-4610-239-10 TM 08580B-10/1 Table 2-3.  Operator/Crew Preventive Maintenance Checks and Services (Unit) (Continued) B - Before D - During A - After H - Hourly Interval Interval Procedures: Equipment Is Item Item to be Check for and have repaired Not Ready/ No. B   D A W Inspected or adjusted as necessary Available If: 23 • R.O.  Pump Motor Wipe motor with a clean cloth dampened with an ap- proved cleaning solvent (P-D-680). • Check oil level and lubri- cate in accordance with lu- bricating order, LO 10- 4610-239-12/LI 08580B-12 • Inspect for signs of over- heating or too much wear. NOTE A new pump may run hotter for a few days.  Change oil before first startup; watch oil level during break-in period. • Listen for uneven, knocking Motor makes un- sound familiar sounds during operation. 24 • R.O.  Pump drain Inspect drain tube end to Drain clogged and tube end ensure that drain is open cannot be cleared. Open restricted drain. 25 • R.O.  Pump cavity Remove the wing nut and cover seals and plungers plate which are located at the top center of pump Plungers equipped with rubber splash guards are now exposed.  Using spanner wrench, tighten packing nut. Inspect R.O.  pump cavity to Water level in make sure excessive leakage R.O.  pump cavity is not occurring: rises near plungers during operation. CAUTION Excessive leakage will contami- nate the oil and score the plungers. 2-27