Sullair 3700B - Oil Return; Sight Glass Maintenance; Pressure Regulator Adjustment

6: Maintenance 3000PB, 3700B, 4500B, 3000PVB, 3700VB, 4500VB User Manual
02250216-786 R01
58 Subject to EAR, ECCN EAR99 and related export control restrictions.
6.9 Oil return / sight glass
maintenance
Refer to Figure 6-4. The oil return/sight glass subassem-
bly is attached to the side of the separator tank. Oil
r
eturn/sight glass maintenance should be performed on a
routine basis parallel to that of the fluid filter, or as indi-
cated in the troubleshooting section of this manual. The
m
aintenance on an oil return/sight glass is mainly con-
cerned with the condition of the filter assembly. Order fil-
ter assembly No. 02250117-782, and use the following
ins
tructions as a guide.
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.
6.10 Pressure regulator adjustment
Refer to Figure 6-5. Start the compressor and adjust the
service valve to maintain service air pressure approxi-
mately at 1 psi over rated pres
sure. 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 lock-
nut. The regulator is now properly set.
1
2
3
4
5
6
7
8
Figure 6-4: Oil return / sight glass
1. To separator/sump tank
2. Male tube connector
3. 90° pipe elbow
4. Filter assembly
1
5. Sight glass / orifice block
6. Brass plug orifice
7. Female tube connector
8. To unit
1
Oil return filter replacement kit P/N: 02250117-782
1
2
Figure 6-5: Regulator adjustment
1. Locking nut
2. Adjustment screw