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. 39
2. Disconnect the pipe connected to the mini-
mum pressure valve and remove the valve
from the cover of the fluid/air separator.
3. Unscrew the top cap of the valve and
remove the piston from the valve.
4. Clean the valve and piston carefully.
5. Replace the O-ring, applying a layer of
grease to the O-ring and the piston.
6. Apply Loctite gasket maker to the top cap of
the valve and reassemble the valve.
7. Reinstall the valve on the cover of the fluid/
air separator tank and reconnect the pipe.
6.4.8 Solenoid valve maintenance
The solenoid valve needs little service. However, if the
solenoid is reacting slowly or is leaking and the working
voltage is correct, you should clean the valve or, if neces-
sary, replace it (repair kit part number 88291010-180).
6.4.9 Drive coupling maintenance
1. Shut down the compressor.
2. Remove the shroud from the fixing cap.
3. Remove the screws from the fixing cap.
4. Slide the fixing cap to expose the elastomer.
5. Remove the elastomer and inspect it.
• If the elastomer is worn out, deformed, or
torn, replace it with a new elastomer and
contact your Sullair representative.
6. Reassemble the coupling assembly.
• The coupling shall be mounted so that the
gap between the ends of the two plates is
2–3mm.
7. Replace the screws on the fixing cap.
8. Replace the shroud on the fixing cap.
6.5 Main motor operation and
maintenance
• Ambient temperature ≤ 40°C (104°F)
• Altitude ≤ 1000 m (3280 ft)
See the main motor nameplate and the other topics in
this section for additional information about operating
conditions.
6.5.1 Main motor operation
• The main motor must be grounded correctly.
The ground wire of the main motor is already
connected in the electric cabinet. You only
need to connect this connection point to your
ground.
• The lead wires of the main motor are clearly
marked.
• The main motor connection diagram is on the
motor nameplate.
• If the voltage and frequency of the power
source for the main motor match the require-
ments on the motor’s nameplate, the motor can
operate continuously at the rated power × utility
coefficient. If the power source’s frequency
deviates from the value on the nameplate by
1%, or under voltage or over voltage exceeds
10%, the motor is not guaranteed to deliver that
output power continuously.
• The compressor motor runs best when imbal-
ance among the three phases does not exceed
1%.
WARNING
Isolate the compressor from the power supply
before making any repairs or adjustments to the
drive coupling.
Figure 6-7: Flexible drive coupling
1. Motor spindle plate
2. Elastomer
3. Fixing cap
4. Compressor mounting plate