Maintenance Of The Separator Oil Return Line (Scavenge); Figure 28 Scavenge Line - Hertz HDD Series Instruction Manual

MAINTENANCE

9.3.9 Maintenance Of The Separator Oil Return Line (Scavenge)

➢ While the separator filter separates the air from oil, some oil penetrates inside from the
filter element. This oil is recycled into the system through the oil return line.
➢ When the compressor operates under load, the oil flow should be observed from the oil
return line hose.
➢ If the small hole (orifice) in the oil return line is clogged the oil level in tank rapidly
decreases, resulting in oil flow into the compressed air system.
➢ If you detect any oil flow during the water discharge under the air tank or the compressor
oil level continuously reduces at each daily oil level checks, the scavenge line might be
clogged. Stop the compressor, and remove the scavenge line, and clean the small hole
(orifice) in the scavenge line by compressed air or a piece of thin wire.
➢ Do not enlarge the scavenge orifice diameter, or the compressor capacity reduces.

Figure 28 Scavenge Line

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