2-42.1. BUTTERFLY VALVE WITH ACTUATOR (LOWER SECTION). This task covers: (YODEL ROWPU-1 ONLY)
Tools, see TM 10-4610-232-12, Appx B,
Sec Ill. Ref Code (No.):
ROWPU shutdown. Butterfly valve and
Tool Kit, General Mechanics Automotive (1)
control top removed from actuator.
Arbor Press (4)
(para. 4-47.1, TM 10-4610-232-12)
Pliers, Retaining Ring, External (4)
Pliers, Retaining Ring, Internal (4)
General Safety Instructions:
Tool, Valve Actuator (10)
Tape, Antiseize (Appx B, Sec II, Item 67)
Observe specific Warnings in the text.
Preformed Packings (TM 10-4610-232-24P)
a. Place a sleeve around rising stem (1) so that all pressure from the press will be applied to the surface of the
mounting adapter (2).
Severe injury or death may occur from releasing internal parts of the actuator which are
under spring pressure inside the actuator. Do not attempt to disassemble the actuator
unless it is securely and properly placed within a press.
b. (Refer to Figure 2-49.1). Place the actuator in place into a press with the ram of the press centered on the
actuator. When placing the actuator in the press, be sure that the coupler (3) is free to rotate.
c. Match mark adapter (2) with cylinder (4) for use during reassembly.
d. Slowly push the mounting adapter (2) into the actuator cylinder (4) until the split wire retaining ring (5) is
e. Remove the split wire retaining ring (5) from its groove in the actuator cylinder (4).
Slowly release the ram of the press until the springs inside the actuator stop pushing against the ram. The piston
assembly (6) will rise about 2.00 inch above the actuator cylinder (4) before the springs reach free length and stop
g. Remove retaining ring (5), seal retainer (7), vee packing (8), mounting adapter (2) O-ring (9), piston assembly
(6), outer spring (10), inner spring (11), thrust drive (12), and thrust bearing (13).
h. Match mark coupler (3) to cylinder (4) and then remove spring pin (14), coupler (3), drive assembly (15), thrust
bearing (16), and O-ring (17) from actuator cylinder (4).
Remove two bearings (18) and two bearings (19) from drive assembly (15) and cylinder (4).
Damage to smooth surface of rising stem (1) will cause the actuator to fail. When removing the
rising stem do not scar the smooth surface of the stem. Use flat surfaces near top of the stem
at threads at the wrench gripping area.
Remove nut (20), lock washer (21), gasket (22), rising stem (1) from piston (23).
k. Remove O-ring (24) from piston (23).