Sullair Air-Cooled Compressor 10B 40HP-251325-003 AC

Warning: Always ensure the compressor is turned off and fully depressurized before starting maintenance.

Replace o-rings and the teflon seat of Blow down valve no.250025-655. Use repair kit no. 250031-772.

Unscrew end caps from the valve body and remove

Hold nut with an appropriate socket wrench and turn screw until loose

Remove all internal parts mounted on the machine screw. Remove the old o-rings and teflon seat and discard

Replace with the new o-rings and teflon seat provided in the repair kit. Apply appropriate lubricant to o-rings and valve body bore

Pre-assemble the internal parts for pilot (P) side of the valve onto the screw and install into the body

Assemble remaining internal parts for inlet (I) side to the screw as illustrated. Once assembled, install the locknut and torque to 25 in.-lbs. (2.82Nm)

Screw end caps into the valve body until tight

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

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

Remove the seal ring and discard

Clean piston assembly and valve thoroughly

Replace seal ring and coat the piston and seal with Parker Super “O” Ring Seal or an equivalent quality grease

WARNING: Extreme caution should be used when removing the cap from the body because there is spring tension on the cap

Warning: Turn off all power, relieve line pressure, and disconnect coil lead wires to the valve before making repairs

It is not necessary to remove the valve from the pipe line for repairs

Clean solenoid valve (P/N 250017-993)

Remove the retaining cap and slip the entire solenoid off the solenoid base subassembly

Unscrew the solenoid base assembly. Remove the core assembly, core spring and body gasket

Remove the end cap, body gasket, disc spring, and disc holder assembly

Replace worn or damaged parts with repair kit number 250018-970

Reassemble in reverse order of disassembly

Sign off on the maintenance procedure

Check the fluid level in the sump. Should the level be low, simply add the necessary amount

Observe the gauges and indicators to be sure they monitor the correct readings for that particular phase of operation

Check on the overall compressor and gauges to assure that the compressor is running properly after it has warmed up

Clean the return line strainer after the initial 50 hours of operation

Clean the return line orifice after the initial 50 hours of operation

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