Central Pneumatic 68140 Set Up And Operating Instructions Manual page 17

Yearly
Inspect the tank yearly for rust, pin holes, or other
imperfections that could cause it to become unsafe.
Avoid using solvents when cleaning plastic parts. Most
plastics are susceptible to damage from various types of
commercial solvents and may be damaged by their use.
Use clean cloths to remove dirt, dust, oil, grease, etc.
LUBRICATION
See Figure 6.
Before starting this compressor, check the lubricant level.
Place the compressor on a level and straight surface.
The oil level should register at the halfway point on the
sightglass. Remove the oil fill plug to add lubricant. Do not
overfill.
Ambient Temperature
30-104°F
Below 30°F
Do not use petroleum based automotive oils because
specific types have a tendency to foam and leave carbon
deposits when used in compressors.
How to change the oil
See Figures 13.
Shut off the engine. After releasing any air pressure you
can unscrew the oil fill plug from the compressor pump. To
prevent the oil from running out in an uncontrolled manner,
hold a small metal chute under the opening and collect the
oil in a vessel. If the oil does not drain out completely, we
recommend tilting the compressor slightly.
Dispose of the old oil at a drop-off point for old oil.
When the oil has drained out, re-fit the oil fill plug. Fill new
oil through the oil filler opening (ref. 14) until it comes up to
the required level. Then replace the oil drain plug.
Condensation
Rust can form inside the crankcase and on internal
components as a result of condensation. A compressor
must operate long enough during each run cycle to reach
full operating temperature in order to reduce the risk of
condensation.
MAINTENANCE
SAE Viscosity
SAE 40
SAE 30
17
OIL
DRAIN
PLUG
OIL
SIGHT
GLASS
OIL
FILL
PLUG
CAUTION:
Lubricant that appears milky may have mixed with
condensate. Failure to replace contaminated lubricant
will result in damage to the compressor and may void
warranty.
Condensation can also form in the air tank of your
compressor. When this happens, a mixture of air and
moisture will be expelled through the service valve and
into whatever is connected to the valve (e.g. air hoses,
metal air lines, pneumatic tools, spray guns). An in-line
filter, may be required to eliminate the moisture.
Condensation in the air tank can be kept to a minimum by
draining the tank on a daily basis. This also reduces the
risk of rust developing and weakening the tank.
Fig. 6