6: Maintenance
ST18 & ST22 (U.S.A. & Mexico) Operation & Maintenance Manual
88291013-137 R05
28
Subject to EAR, ECCN EAR99 and related export control restrictions.
6.3
Recommended maintenance
schedule
6.3.1
Service at 50 operating hours
• Replace the fluid filter element.
• Check the condition of the purge oil return line
filter and replace the filter if necessary.
• Tighten all electrical connections.
• Assess the condition of the air filter element. If
it is excessively dirty, you may need to replace
it more frequently than the normal schedule
(every 2000 hours).
6.3.2
Service every 1000 operating hours
• Replace the fluid filter element(s).
• Inspect the air filter element and replace it if
necessary.
• Check the condition of the purge oil return line
filter and replace the filter if necessary.
• Tighten all electrical connections.
6.3.3
Service every 2000 operating hours
Perform all checks listed for every 1000 hours plus:
• Replace the air filter element.
• Grease the main motor bearings.
• Use POLYREX EM grease unless the
motor nameplate indicates a different
grease model.
• Refer to the motor nameplate for grease
filling volume and filling locations.
• Take a sample of the compressor fluid and
send it for analysis.
• Change the compressor fluid (Sullube
®
) if
the analysis indicates it is necessary.
6.3.4
Service every 4000 operating hours
(or semi-annually)
Perform all checks listed for every 1000 and 2000 hours
plus:
• Replace the fluid/air separator element and
purge oil return line filter.
• Inspect the flexible drive coupling and service it
if necessary.
• Tighten all nuts, bolts, pipe fittings and electri-
cal connections.
• Check that all safety devices are operating cor-
rectly.
6.3.5
Service every 10,000 hours (or yearly)
Perform all checks listed for every 1000, 2000, and 4000
hours plus:
• Change the compressor fluid (Sullube
®
)
Table 6-1: Standard maintenance intervals
Fluid
Change intervals
1
(all hours are operating hours)
Fluid
Fluid
filter
2
Fluid/air
separator
element
Air filter
2
Sullube
®
1 year or
10,000 hours 1000 hours
6 months or
4000 hours 2000 hours
1
If multiple intervals are listed, change the item at
whichever interval is reached first.
2
If the compressor is in a dusty environment, you
should service the fluid and air filters more frequently.
NOTE
Service intervals may be extended if the com-
pressor is installed in a clean, cool environment.
Contact your Sullair representative for advice on
the correct service intervals for your installation.
