5-21. AIR DRYER REPAIR (Continued).
Clean and dry entire check valve area and top
Use care in removing top cap bolts (21) to
pre-vent bodily injury because the cap is spring
Remove eight cap screws (21A) holding top cap
(22) to body (14) and remove spring (23).
Cleaning solvent (Appendix D, Item 54) is both
toxic and flammable. Keep off skin. Use only in
a well-ventilated area and avoid prolonged
breathing of vapors. Keep away from open
Do not mar or scratch gasket surfaces.
Remove all traces of gasket material from top
cap and body gasket surfaces. Discard gasket
(24). Wash top cap in cleaning solvent (Appen-
dix D, Item 54).
m. Remove complete filter assembly (25).
Remove rubber packing ring (26).
Remove stainless steel filter (27), filter cup
(28), strainer (29) and V-spring (30).
Remove thermostat (3 1) by removing two
Remove heater by loosening set screw.
Repair consists of replacing damaged or defec-
Replace all gaskets and O-rings.
Install new thermostat (31) by inserting it into
the hole from which old thermostat was re-
moved and attach by means of the two screws
Install new heater (32) by inserting it into hole
from which old heater was removed and re-
tighten set screw.
Install new U-cup (4) in groove of unloader pis-
ton (3). Lips of U-cup (4) should face away from
Apply a light film of lubricant (Appendix D,
Item 37) to O-ring (2) and position on unloader
Position the two copper gaskets (11) together
and lightly coat exposed surfaces with lubricant
(Appendix D, Item 37). Then position lubri-
cated gaskets on shoulder of ring seat (9). Gas-
kets should be on face opposite the spring (8).
Place gaskets (11) followed by seat ring as-
sembly into bottom cap (13).