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CAS440HT Air Compressor Manual Part # 99900838
Hydraulic Fluid Deterioration
Contamination of the hydraulic fluid by solvents, water, dust or other abrasives will cause
deterioration of the fluid. Sustained presence of the impurities will result in premature
breakdown of antifoam, lubrication, anti-rust and viscosity properties. Introduction of water to
the system and operation at high temperatures (above 180°F) will result in an increase in the oil
oxidation rate. Oxidation produces varnish forming materials and sludge in the oil.
Operating the system on a sustained basis with contaminated or broken down oil will increase
wear and can significantly shorten the efficient service life of the unit.
Periodically, draw off a sample of the oil and check the oil for breakdown. To check oil quality:
1
Place the oil in a clean glass.
2
Smell the oil to detect a burnt or rancid odor.
3
Visually examine the oil for a dark or cloudy appearance.
4
Allow the sample to stand for several minutes. Inspect the sample for water which will settle
to the bottom of the glass if present. Water can result from a system leak or condensation
due to temperature extremes.
In case of any of these conditions, the system should be purged and filled with new oil. In
addition, the oil should be changed in the reservoir and complete system:
1
After every 800 hours of operation or every six months, whichever occurs first.
2
After pump or other major hydraulic component failure, drain the hoses.
