TM 5-4310-393-14b.If oil coating is below top mark, remove oil cap (3) and fill with oil of proper viscosity as required.c.Select an oil viscosity grade to suit ambient temperature using Figure 3-1.d.After adding oil, check oil level again to be sure oil coats dipstick to top mark.e.If oil coating extends above the top mark, loosendrain plug (Figure 1-2, Item 6) and drain enough oil tolower the oil level to top mark on dipstick then tightendrain plug securely The drain plug is located in the baseof the engine opposite the flywheel, below thecrankshaft.f.When the procedure is complete, ensure that oilcap (3) is securely replaced.3-5. LUBRICATION OF COMPRESSOR.The third stage is force lubricated by a pump (Figure 3-3,Item 1) operated by a cam of the crankshaft The oilpressure regulator valve (2) maintains the properworking pressure Any oil not needed by the third stage isreturned to the crankcase through the feedback tube (3).Other moving parts of the compressor are lubricated withoil splashed by the crankshaft Cylinders of the first andsecond stages receive additional lubrication from oilvapors from the crankcase vent feedback line (4).3-5.1. Operation Under Severe Conditions.For operation under severe operating conditions such ascontinuous running and/or high ambient temperatures,the use of synthetic compressor oil is recommended.This oil can also be used under normal conditions. Seeparagraph 3-6 for oil specifications3-5.2. Compressor Oil Level Check.Check the oil level before starting the compressor. Tocheck the oil level, vent any residual pressure from thesystem by opening and then closing the manual drainvalves/purge valves on the separators and purificationsystem. Open the filler cap slowly, allowing any residualpressure to vent from the crankcase Remove thecap/dipstick from the oil filler neck. Wipe the dipstickwith a lint-free cloth.FIGURE 3-2. ENGINE OIL FILLFIGURE 3-3. COMPRESSOR OIL SYSTEM3-3
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