Product Manual

ShopTek™ ST45, ST55, ST75 (U.S.A. & Mexico) Operation & Maintenance Manual 6: Maintenance
88292021-240 R01
Subject to EAR, ECCN EAR99 and related export control restrictions. 41
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 0.2 MPa (29 psi) can damage the insula-
tion.
• 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.
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
Table 6-2: Troubleshooting guide lists some compressor
symptoms with their most probable causes and remedies
CAUTION
Never disassemble the machine without a spe-
cific purpose.
Table 6-2: Troubleshooting guide
Symptom Possible causes Remedy
High discharge air
temperature
Low fluid level in fluid/air separator Check fluid level. Add fluid if necessary.
Cooler fin dirty Clean cooler fin
Fluid filter clogged and bypass valve
failed
Replace fluid filter element
High ambient temperature Improve ventilation
High resistance in exhaust duct
• Enlarge exhaust duct
• Install fan in the duct
Thermal resistor temperature trans-
ducer RTD failure
Check RTD connector. If the connector
is good, replace RTD.
Fan motor damaged Check and repair fan motor