Sullair 20/12 500 CFM, Operator'S Manual And Parts List

Page: 30 / 66

Section 6
MAINTENANCE
26
1. Loosen the locknut and turn the adjusting screw
counterclockwise until the inner spring tension is
relieved. The adjusting screw should turn freely
when the spring tension is relieved.
2. Remove the spring chamber from the body to al-
low access to internal parts.
3. Next, remove the spring button and spring.
4. At this time, remove the pressure plate nut and
disassemble the pressure plate, diaphragm, dia-
phragm gaskets (rubberized asbestos), seat disc
and seat gasket.
5. Remove the body plug from the body to allow ac-
cess to the post assembly. Remove and discard
the o--ring on the plug.
6. Extract the piston spring, piston and pusher post
from the valve body.
7. Turn the body over and remove the retainer plate
by extracting the retainer plate screws, This will
allow access to the o--ring and seals the pusher
post.
8. Remove and discard the o--ring.
9. The next step is to reassemble the regulator using
the new parts provided in the repair kit.
10. Reassemble the diaphragm, pressure plate dia-
phragm gasket, pusher post button, seal disc
gasket and tighten the nut. All of these parts with
* Repair Kit P/N 048410
(P/N 048354)
F igur e
6
-8 Cont r ol P r es s ur e Regulat or
the exception of the pressure plate are provided in
the repair kit.
11. Replace the pusher post o--ring with the new one
provided in the kit. Also place the new o--ring on
the body plug.
12. Replace the retainer plate.
13. Screw the pusher post into the piston and replace
them as shown in the body.
14. Replace the body plug.
15. Next, place these parts in their proper place on the
body and replace the spring as it was prior to dis-
assembly.
16. Place the spring over the spring button as shown.
17. With all parts in order, replace the spring chamber
and tighten.
18. Tighten the adjusting screw until tension is real-
ized.
19. At this time, refer to the Control System Adjust-
ment Procedure to readjust the control pressure
regulator valve.
FLUID STOP VALVE
Ref er t o F igur e 6 -- 9 . W hen s ervicing the fluid stop
valve (P/N 250038--489) use repair kit numbers
250038--490 and 250038--494. Use all parts pro-
vided in the kit. The valve may be serviced without
removing it from its associated piping if it is accessi-
ble.
NOTE
Repair kit P/N 250038--490 is to update valve P/N
250028--140. It does not contain lower poppet as-
sembly.
1. Remove the large hex nut on the bottom of the
valve. Be careful not to lose the parts restrained
by the nut as they are under light spring pressure.
2. Remove the bottom cap, poppet spring, and pop-
pet assembly. Discard spring and poppet assem-
bly.
3. Remove seal from bottom cap and discard. Install
new seal provided in kit.
4. Install new poppet assembly and spring. Install
bottom cap.
5. Replace large hex nut and tighten securely.
6. Remove the four (4) bolts and cylinder cover on
the top of the valve. Restrain cover as it is under
light spring tension.
7. Remove seal from cover and discard. Install new
seal.
8. Remove pilot cylinder. Remove piston from cylin-
der.
9. Remove the quad ring and wear strips from piston
and discard. If you are installing the piston repair
kit (P/N 250038--490), discard piston also.
10. Remove piston rod.
11. Remove piston rod guide. Remove cylinder seal
and o--ring from guide and discard.
12. Check operation of new poppet assembly
installed in lower body assembly.
13. Clean all parts thoroughly before reassembling
valve.