REPAIR
REASSEMBLY
TM 10-4610-232-34
a. Replace all damaged, missing, or unserviceable parts.
b. Replace damaged preformed packing and snap rings.
a. Lubricate and install O-ring (24) onto piston (23).
b. Lubricate and install two bearings (19) onto cylinder (4) and two bearings (18) onto drive assembly (15).
c. Lubricate and install thrust bearing (13) into drive assembly (15). Place thrust drive (12) onto top of thrust
bearing.
d. Lubricate and install O-ring (17) onto drive assembly (15).
e. Install thrust bearing (16) into bottom of actuator cylinder (4).
CAUTION
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.
f. Assemble rising stem (1), gasket (22), lock washer (21), and nut (20) onto piston (23).
g. install vee packing (8) and seal retainer (7) onto mounting adapter (2) and rising stem as follows:
(1)
Cover the threads of rising stem (1) with tape.
(2)
Slide the vee packing (8) over the rising stem (1) with the "V” side facing down (toward the piston).
(3)
Partially insert the vee packing (8) into the smallest counter bore on the top of the mounting adapter (2)
using a flat tool to assist the outer lip of the vee packing.
(4)
Slide the retainer seal (7) over the rising stem (1) and onto the vee packing (8).
(5)
Complete the installation of the vee packing (8) by pushing the seal retainer (7) into place.
(6)
Remove masking tape from rising stem (1).
h. Place inner spring (11) and outer spring (10) into drive assembly (15).
CAUTION
Damage to the actuator will occur or the actuator will not function properly if the internal
bearings are not correctly aligned. Be sure that all bearings on the drive assembly are
aligned with the grooves on the sides of the piston.
i. Before pressing piston assembly (6) and mounting adapter (2) into the actuator cylinder (4), the bearings in the
cylinder and on the drive assembly (15) must be properly aligned with the grooves in the piston (23). To align
bearings, do the following:
(1)
Look inside the cylinder and mark the outside surface of the cylinder to indicate the locations of center line
bearings (19) inside the cylinder.
(2) Place the piston assembly (6) onto the inner and outer springs (11) and (10) which have been placed into
drive assembly (15).
(3) Align the vertical bearing groove of the piston (23) with the mark made on the outside of the cylinder in step
(1).
(4) Place another mark on the outside surface of cylinder (4) to indicate where the centerline of the curved
bearing groove is when the vertical groove is aligned with the mark made in step (1).
(5) Remove the piston assembly (6) from the cylinder (4).
(6) Rotate the drive assembly (15) inside the cylinder (4) until the bearings on the drive assembly line up with
the mark made on the outside of the cylinder in step (4) to align the bearings on the drive assembly with the curved
groove of the piston.
Change 3
2-168.3
