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: WARNING Do not operate ROWPU with an open box assembly; it can kill you Inspect the plug connectors, toggle switches, and lamps for loose mountings and bad parts.  Replace lamps that don’t work.  See that the junction box is securely mounted and kept closed. 20 • R.O.  pump drive Inspect belt guard for loose Belt guard off or belt guard mounting bolts.  Tighten all hanging. Studs, nuts, and capscrews. 21 • R.O.  Pump drive Check all five V-belts for cracks, Belt tension belts. Rubbing, and signs of wear. Adjustment; belts Check belt tension: You should be are defective. Able to push belts down only a half- inch at c enter of span. 22 • R.O.  pump, wiring, motor Inspect wire connection going to mounts, head gasket, and junction box.  Inspect the motor piping mounts for cracks or breaks.  Look for dirt, corrosion, or water damage. Check for head gasket leaks and piping leaks. WARNING P-D-680 is potentially dangerous. Avoid repeated and prolonged breathing of vapors and skin contact with the liquid.  Do not use near open flame, arcing equipment or other ignition sources.  Always wear protective clothing and eyewear. 2-26