Sullair 3700 - Pressure Regulator Adjustment

3000-4500 USER MANUAL SECTION 6
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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:
1. To Separator/Sump Tank
2. Male Tube Connector
3. 90° Pipe Elbow
4. Filter Assembly*
5. Sight Glass/Orifice Block
6. Brass Plug Orifice
7. Female Tube Connector
8. To Unit
* Oil Return Filter Replacment Kit: P/N 02250117-
782
Figure 6-4: Oil Return/Sight Glass
1. Disconnect the tube at bottom of sight glass.
2. Unscrew the sight glass assembly where the
elbow fitting joins the strainer/filter.
3. Remove used filter assembly, and replace
with new assembly.
4. Inspect and clean the orifice inside the sight
glass blocks. The orifice must be removed
with an allen wrench.
5. Coat/lubricate the O-rings with silicone
grease.
6. Reattach the connectors to the sight glass/
orifice blocks.
PRESSURE REGULATOR ADJUSTMENT
Refer to Figure 6-5. Start the compressor and adjust
the service valve to maintain service air pressure
approximately at 1 psi over rated pressure. Turn the
inlet valve regulator adjusting screw until air just
begins to escape from the control air orifice, located
at the bottom of the regulator. Lock the adjusting
screw in place with the locknut. The regulator is now
properly set.
1. Locking Nut
2. Adjustment Screw
Figure 6-5: Regulator Adjustment
Water Condensate Drain Maintenance If your
compressor is fitted with the standard solenoid
condensate drain valve, it is necessary to periodically
clean the strainer. Remove the hex cap from the
strainer and remove the strainer screen. Clean the
screen and reinstall. If the screen is damaged, the
strainer assembly must be replaced (P/N 241772).
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