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.
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6.4.4.1 Replacing the air filter element
1. Shut down the compressor.
2. Clean the outside of the canopy.
3. Unscrew the outer wing nut.
4. Remove the canopy and pour out any dust.
5. Unscrew the inner wing nut.
6. Remove the washer and the filter element.
7. Clean the inside of the canopy. Do not use
compressed air.
8. Install the new filter element.
9. Reassemble the air filter.
10. Reset the service indicator.
6.4.4.2 Inspecting the air filter element
• Insert a bright light source into the air filter ele-
ment and look for light shining through holes or
cracks.
• If you find any holes or cracks, the element
is damaged and should be discarded.
• Check the condition of all washers.
• If a washer is damaged, replace the
washer.
• If the filter element is excessively dirty, replace
it with a new element.
• Do not strike the filter element against a
hard surface to remove the dirt. You may
damage the element.
• Do not oil the filter element.
6.4.5
Purge oil return line filter
maintenance
Clean the purge oil return line filter after the first 50 hours
of service. Check the condition of the purge oil return line
filter every 1000 hours of service for blockages or other
problems. Replace the purge oil return line filter when
you replace the separator element.
When replacing the separator element, adjust the purge
oil return line tube so the tube is centered within the sep-
arator element with a clearance from the separator ele-
ment base of 1 to 3 mm.
6.4.6
Fluid/air separator maintenance
Replace the fluid/air separator element every 4000 hours
or if the pressure drop is greater than 0.7 bar (10 psi).
You may need to replace the separator element more fre-
quently in dusty or hot conditions.
6.4.6.1 Replacing the fluid/air separator
element
1. Shut down the compressor and bleed pres-
sure to zero.
2. Loosen the swivel nut on the discharge hose
connecting the minimum pressure valve to
the aftercooler.
3. Disconnect the fittings and pipes from the
separator cover and minimum pressure
valve. Mark the locations of the fittings and
pipes to ensure correct reassembly.
4. Remove the separator cover retaining bolts.
5. Remove the cover, complete with the mini-
mum pressure valve, carefully clearing the
purge oil return line tube projecting into the
center of the separator element.
6. Remove the separator elements.
Figure 6-4: Air filter service indicator
1. Air filter service indicator
NOTE
The fluid/air separator element cannot be
cleaned or re-used.
