PREVOST H3-41 Maintenance Manual page 901

FIGURE 33: R.H. SIGHT GLASS
FIGURE 34: L.H. SIGHT GLASS
Normal
SECTION 22: HEATING AND AIR CONDITIONING
OIL EVALUATION CRITERIA
Shows deterioration
Should be changed soon
PA1621 Maintenance Manual All Series | Revised February 2019
The oil level is expected to remain the same
over time except if there is a loss of refrigerant.
Adding oil must be done by taking the same
precautions as when changing oil in order not to
introduce the moisture content of the ambient air
in the air-conditioning system.
3. Check for discoloration of the oil. It should be
clear and light in color. Darkened, cloudy and
contaminated oil
Diagnose the problem. See the following
images to help you evaluate the state of the
compressor oil.
Tip: use the reflection of light
on the threads to help you
determine the color of the
Must be changed at once
must be changed.
oil.
Heavily deteriorated
compressor has suffered
damage due to this oil
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