(5) Separate the regulating (2), operating (13), and exhaust (10) valve bodies. Remove and discard the oil
seals (3). Be careful not to damage or scratch the mounting surfaces when removing the seals.
(6) Remove the four setscrews (6) attaching the lever bracket (5) to the operating valve body (13). Lift up and
remove the lever bracket (5).
(7) Remove and discard the gasket (9).
(8) Remove the four setscrews (6) attaching the operating valve spring cover (19) to the operating valve body
(13). Remove the operating valve spring cover (19).
(9) Remove and discard the gasket (9).
(10) Remove the felt washer (7) and piston seal (8). Push out the piston (14) from the operating valve body (13).
(11) Use a small drift to drive out the piston pin (18) from the piston (14).
(12) Remove the spring (17), piston stop block (16), and spring control washers (15) from the piston (14).
(13) Turn the regulating valve spring cover counterclockwise and remove the cover (20) from the regulating valve
body (2).
(14) Remove the locknut (21), washers (22), and adjusting screw (23).
(15) Unscrew the four setscrews (6) and remove the cover (24) from the regulating valve body (2).
(16) Lift out and remove the packing ring (25), regulating valve spring (26), plunger (27), and seat (28). Discard
the packing ring (25).
c. Cleaning. Wash all metal parts in cleaning solvent and wipe them dry with a soft absorbent cloth. Blow off all
passages in the valve bodies and piston with clean compressed air. Remove all dirt and sludge from the mounting
surfaces and make sure that all parts are absolutely clean and free from the slightest trace of dirt or dust particles.
d. Inspection and Repair.
(1) Replace all gaskets, oil seals, and packing rings.
(2) Check the mounting surfaces for scratches, etching, and pitting. The mounting surfaces are machined to
very close tolerances, and even the slightest scratch or flaw will cause the valve to leak. Replace the valve
bodies if the mounting surfaces are corroded, pitted, scored, or etched.
(3) Inspect the springs for corrosion, twisting, and metal fatigue. Replace defective springs.
330
