SECTION 6 4500P-7500 USER MANUAL
61
1. Loosen and remove the eight (8) hex head
capscrews (M12 x 40mm) from the cover
plate.
2. Lift the cover plate from the receiver tank.
3. Remove the separator elements.
4. Inspect the receiver tank for rust,
contamination, or damage.
5. Reinsert the separator elements into the
receiver tank taking care not to dent the
element against the tank opening.
6. Install a new lubricated O-ring in the O-ring
groove on the underside of the receiver tank
cover.
7. Replace the cover plate, washers and
capscrews. Torque to 89 ft·lbs. (121 Nm).
8. Clean the return line strainer before
restarting the compressor.
FLUID RETURN/SIGHT GLASS MAINTENANCE
Refer to Figure 6-4. The fluid return/sight glass
subassembly is located on the side of the
separator tank. Fluid return/sight glass
maintenance should be performed along with
that of the fluid filter. Fluid return/sight glass
usually results from condition of the filter
assembly. Order filter 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 the new assembly.
4. Inspect and clean the orifice inside the sight
glass blocks. Remove the orifice with an
allen wrench.
5. Coat/lubricate the O-rings with silicone
grease.
6. Re-attach 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 at approximately 1 psi over its 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.
Figure 6-4: Fluid Return / Sight Glass
Figure 6-5: Pressure Regulator Adjustment
1. To Sump
Tank
3. 90°
Elbow
5. Sight
Glass / Ori-
fice Block
7. Female
Tube Con-
nector
2. Male
Tube Con-
nector
4. Filter
Assembly (I)
6. Brass
Plug Orifice
8. To Unit
(I) Fluid Return Filter Replacement Kit
P/N 02250117-782
1. Locking Nut 2. Adjustment Screw
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