TM 9-2320-289-347-3.POWER BOOSTER REPAIR (Con’t).5 .Install new “O” ring (25) onto spoolvalve plug (26). Push spool valve pluginto housing (9). Install spool plugretaining ring (27) and ensure that itis fully seated. Install spool returnspring (24) and spool valve assembly(16).6 .Coat rod and piston unit (17) withclean hydraulic fluid. Position housing(9) over cover (20) and slide pins onpiston lever into groove on spoolvalve. Using a screwdriver to carefullydepress lip of piston seal (15), slidehousing and piston onto cover.TA503837-13
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