Sullair Air-Cooled Compressor 10B 30HP-251333-004 AC

Replace the piston spring, piston o-ring seal ring, and check valve spring of the onlet valve (P/N 250025-654). Use repair kit number 250019-451

Remove all piping connected to inlet valve assembly

Remove the four (4) capscrews and lockwashers that attach the valve body to the compressor unit and remove from compressor

Remove snap ring and Teflon o --- ring inside valve body

Lift and remove check valve assembly and spring from valve body

Remove piston cap, piston spring, and piston

Clean valve body as needed, making sure all air passages are clear and old seal ring is removed from the inlet body flange

Reassemble the inlet valve using the new parts supplied in the repair kit

Install o --- ring on piston, lightly oil piston, and install in valve body

Place a bright light inside the element to inspect for damage or leak holes. Concentrated light will shine through the element and disclose any holes

Inspect all gaskets and gasket contact surfaces of the housing. Should faulty gaskets be evident, correct the condition immediately

If the clean element is to be stored for later use, it must be stored in a clean container

After the element has been installed, inspect and tighten all air inlet connections prior to resuming operation

Sign off on the air filter element inspection

Warning: This procedure requires trained personnel with PPE!

Adjust Control System with a desired operating range of 115 to 125 PSIG (792 to 862kPa). Differential is the difference between the high and low pressure settings. 10 PSIG (7kPa) is typical

Remove cover to pressure switch

Turn the range adjusting screw to the high pressure setting. Turning the screw counterclock-wise lowers both the high and low pressure equally

Differential is the difference between the high and low pressure settings. 10 PSIG (7kPa) is typical

Turn the differential adjusting screw to the lower (reset) setting. Turning the screw counterclock- wise widens the differential by lowering the reset (lower) setting only

When the pressure switch adjustment is complete, the pressure regulator should be adjusted for the pressure at which modulation of air delivery should begin. In this case that pressure will be 118 PSIG (824kPa). The regulator is adjusted by loosening the jam nut on the end of the cone shaped cover of the pressure regulator. When the jam nut is loose, turn the adjusting screw clockwise to increase or counterclockwise to decrease the setting

To set the regulator, continue closing the service valve, until the line pressure is 118 PSIG (824kPa). At this point regulator should pass a signal to the inlet valve to start closing it. If the line pressure keeps on rising or if the modulation does not begin, adjust the regulator valve as described above. After adjustment line pressure should be approximately 118 PSIG (824kPa) and 1.00 in. Hg vacuum below the inlet

Now close the service valve, line pressure will start rising. When line pressure reaches 125 lbs., the inlet valve will be closed to its maximum position. The inlet vacuum at this point will be around 25 in. Hg. The machine should unload at this point

WARNING: Before performing maintenance on the valve, be sure that all pressure has been relieved in the compressor sump, and all downstream pressure has been vented to the atmosphere. Also be sure that the components of the compressor are cool to the touch

All pressure relieved in the compressor sump?

All downstream pressure vented to the atmosphere?

Components of the compressor are cool to the touch?

Replace o-ring on the piston of Minimum pressure/ check valve (P/N 241581) To replace this ring, use seal repair kit no. 250020-344

Unscrew the minimum pressure/check valve (P/N 241581) from the receiver cover

Remove the hexagonal retaining cap from the main body

Remove the flat washer and heavy spring from the main body

Tap the piston assembly (with a screwdriver) from the bottom of the main body and remove. The o-ring will now be seen easily

Warning: Ensure the compressor is turned off and disconnected from power source before starting the procedure.

Yoke containing the coil and sleeves slipped off the solenoid base sub-assembly

Reassembled in reverse order of disassembly

Sign off on the compressor coil maintenance