Check And Clean The Windings; Troubleshooting - Sullair ShopTek ST18 Operation & Maintenance Manual

6: Maintenance
• Check the main lead-out wiring for overheating
or a corona discharge.
• Tighten the non-insulated electric connections
and check them for overheating, corrosion, or
electrical arcing.
• Tighten all nuts and bolts.
6.5.4

Check and clean the windings

The best way to clean the motor windings depends on
both the accessibility of the surface and what you are try-
ing to remove from it. For a thorough cleaning, or if the
winding is very dusty, the rotor needs to be removed from
of the stator.
Isolate the compressor from the power supply
before checking or cleaning the windings.
6.5.4.1 Dry cloth
You can clean easy-to-reach surfaces that are dusty with
a dry, clean, lint-free cloth.
6.5.4.2 Brush and vacuum
You can clean easy-to-reach surfaces that are dirty or
very dusty by scrubbing them with a short, hard, non-
metal brush, and then vacuuming up the loosened dirt
and dust. (Vacuuming the dirt after loosening it prevents
the dirt from getting deposited on other components.)
6.5.4.3 Compressed air
You can blow dry compressed air through gaps to clean
hard-to-reach surfaces, but you must follow the guide-
lines for cleaning with compressed air.
• The pressure of the compressed air must not
exceed 0.2 MPa (29 psi). Air at pressures
above 2 MPa (29 psi) can damage the insula-
tion.
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ST18 & ST22 (U.S.A. & Mexico) Operation & Maintenance Manual
WARNING
Subject to EAR, ECCN EAR99 and related export control restrictions.
• The compressed air does not contain any con-
densed water so that the motor stays dry.
• The compressed air does not blow the dust
deeper inside the motor. This could make the
dust harder to clean or even block an air duct.
6.5.4.4 Solvent
For a surface covered in bitumen, grease, wax, or oil,
wipe the surface with a cloth soaked in a solvent and
then with a dry, clean, lint-free cloth.
Sullair recommends using a petroleum-based solvent for
cleaning the insulation. In very flammable areas, methyl
chloroform can be used. Although this solvent is not com-
bustible under normal conditions, partial ventilation is
required when the smell of the solvent becomes strong.

6.6 Troubleshooting

Because a compressor fault can have multiple causes,
you should carry out a systematic analysis of the fault to
determine the specific cause before performing service
or replacing parts.
Never disassemble the machine without a spe-
cific purpose.
To avoid damaging the compressor, always perform a
visual check of it prior to attempting any repair, remem-
bering to:
• Check for loose or disconnected cable leads
• Check for damaged or disconnected pipelines,
tubing, or hoses
• Check for parts damaged by excessive heat or
short circuits
88291013-137 R05
CAUTION