6: Maintenance
SN55, SN55S, SN55V, SN75, SN75S, SN75V User Manual
02250247-571 R04
73
Subject to EAR, ECCN EAR99 and related export control restrictions.
6.8
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
return/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
maintenance 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
instructions 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.
6.9
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 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 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
