MAINTENANCE
®SULLAIR®
3700 Operator’s Manual and Parts List
35
AIR FILTER ELEMENT REPLACEMENT
1. Clean exterior of air filter housing.
2. Rotate end cover counterclockwise and remove
3. Remove air filter element by pulling it out of the
housing.
4. Clean interior of housing using a damp cloth. DO
NOT blow dirt out with compressed air.
5. At this time replace the element.
6. Reassemble in the reverse order of the disassembly.
6.8 SEPARATOR MAINTENANCE
Replace the separator element when indicated by the
microprocessor or after one (1) year, whichever comes
first. The separator element must be replaced. DO NOT
attempt to clean the separator element.
SEPARATOR ELEMENT REPLACEMENT
Refer to Figure 6-3. The separator element must be
changed when indicated by the microprocessor, or once
a year, whichever occurs first. Follow the procedure
explained below for separator element replacement.
1. Loosen and remove the eight (8) hex head
capscrews (5/8 x 2") from the cover plate.
2. Lift the cover plate from the sump.
3. Remove the separator element.
4. Inspect the receiver/sump tank for rust, dirt, etc.
5. Reinsert the separator element into the sump taking
care not to dent the element against the tank
opening.
6. Install a new O-ring in the O-ring groove on the
underside of the receiver/sump tank cover.
7. Replace the cover plate, washers and capscrews.
Torque to 55 ft•lbs. (75 Nm).
8. Clean the return line strainer before restarting the
compressor.
Figure 6-3
1. Cover
2. Ground Spring*
3. Spring Fastener*
4. Cover Gasket*
5. Element*
6. Sump Tank
* Replacement Kit P/N 02250160-774
F i g u r e 6 - 3
Separator Element (P/N 02250160-776)
OIL RETURN/SIGHT GLASS MAINTENANCE
Refer to Figure 6-4. The oil return/sight glass
subassembly is attached to the side of the separator
tank. Oil return/sight glass maintenance should be
performed on a routine basis parallel to that of the fluid
filter, or as indicated in the troubleshooting section of this
manual. The maintenance on an oil return/sight glass is
mainly concerned with the condition of the filter
assembly. Order filter assembly No. 02250117-782, and
use the following instructions as a guide.
NOTE
Relieve all pressure from the sump tank
and all compressor lines.
SU_0000038
NOTE
Always perform maintenance on both oil
return/sight glasses at the same time.
SU_0000039
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